dmake: do not set MAKEFLAGS=k

[unleashed/tickless.git] / usr / src / cmd / init / init.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */

/*
 * Copyright (c) 2013 Gary Mills
 *
 * Copyright (c) 1988, 2010, Oracle and/or its affiliates. All rights reserved.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

/*
 * University Copyright- Copyright (c) 1982, 1986, 1988
 * The Regents of the University of California
 * All Rights Reserved
 *
 * University Acknowledgment- Portions of this document are derived from
 * software developed by the University of California, Berkeley, and its
 * contributors.
 */

/*
 * init(1M) is the general process spawning program.  Its primary job is to
 * start and restart svc.startd for smf(5).  For backwards-compatibility it also
 * spawns and respawns processes according to /etc/inittab and the current
 * run-level.  It reads /etc/default/inittab for general configuration.
 *
 * To change run-levels the system administrator runs init from the command
 * line with a level name.  init signals svc.startd via libscf and directs the
 * zone's init (pid 1 in the global zone) what to do by sending it a signal;
 * these signal numbers are commonly refered to in the code as 'states'.  Valid
 * run-levels are [sS0123456].  Additionally, init can be given directives
 * [qQabc], which indicate actions to be taken pertaining to /etc/inittab.
 *
 * When init processes inittab entries, it finds processes that are to be
 * spawned at various run-levels.  inittab contains the set of the levels for
 * which each inittab entry is valid.
 *
 * State File and Restartability
 *   Premature exit by init(1M) is handled as a special case by the kernel:
 *   init(1M) will be immediately re-executed, retaining its original PID.  (PID
 *   1 in the global zone.)  To track the processes it has previously spawned,
 *   as well as other mutable state, init(1M) regularly updates a state file
 *   such that its subsequent invocations have knowledge of its various
 *   dependent processes and duties.
 *
 * Process Contracts
 *   We start svc.startd(1M) in a contract and transfer inherited contracts when
 *   restarting it.  Everything else is started using the legacy contract
 *   template, and the created contracts are abandoned when they become empty.
 *
 * utmpx Entry Handling
 *   Because init(1M) no longer governs the startup process, its knowledge of
 *   when utmpx becomes writable is indirect.  However, spawned processes
 *   expect to be constructed with valid utmpx entries.  As a result, attempts
 *   to write normal entries will be retried until successful.
 *
 * Maintenance Mode
 *   In certain failure scenarios, init(1M) will enter a maintenance mode, in
 *   which it invokes sulogin(1M) to allow the operator an opportunity to
 *   repair the system.  Normally, this operation is performed as a
 *   fork(2)-exec(2)-waitpid(3C) sequence with the parent waiting for repair or
 *   diagnosis to be completed.  In the cases that fork(2) requests themselves
 *   fail, init(1M) will directly execute sulogin(1M), and allow the kernel to
 *   restart init(1M) on exit from the operator session.
 *
 *   One scenario where init(1M) enters its maintenance mode is when
 *   svc.startd(1M) begins to fail rapidly, defined as when the average time
 *   between recent failures drops below a given threshold.
 */

#include <sys/contract/process.h>
#include <sys/ctfs.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/stropts.h>
#include <sys/systeminfo.h>
#include <sys/time.h>
#include <sys/termios.h>
#include <sys/tty.h>
#include <sys/types.h>
#include <sys/utsname.h>

#include <bsm/adt_event.h>
#include <bsm/libbsm.h>
#include <security/pam_appl.h>

#include <assert.h>
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <libcontract.h>
#include <libcontract_priv.h>
#include <libintl.h>
#include <libscf.h>
#include <libscf_priv.h>
#include <poll.h>
#include <procfs.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdio_ext.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <syslog.h>
#include <time.h>
#include <ulimit.h>
#include <unistd.h>
#include <utmpx.h>
#include <wait.h>
#include <zone.h>
#include <ucontext.h>

#undef  sleep

#define fioctl(p, sptr, cmd)    ioctl(fileno(p), sptr, cmd)
#define min(a, b)               (((a) < (b)) ? (a) : (b))

#define TRUE    1
#define FALSE   0
#define FAILURE -1

#define UT_USER_SZ      32      /* Size of a utmpx ut_user field */
#define UT_LINE_SZ      32      /* Size of a utmpx ut_line field */

/*
 * SLEEPTIME    The number of seconds "init" sleeps between wakeups if
 *              nothing else requires this "init" wakeup.
 */
#define SLEEPTIME       (5 * 60)

/*
 * MAXCMDL      The maximum length of a command string in inittab.
 */
#define MAXCMDL 512

/*
 * EXEC         The length of the prefix string added to all comamnds
 *              found in inittab.
 */
#define EXEC    (sizeof ("exec ") - 1)

/*
 * TWARN        The amount of time between warning signal, SIGTERM,
 *              and the fatal kill signal, SIGKILL.
 */
#define TWARN   5

#define id_eq(x, y)     ((x[0] == y[0] && x[1] == y[1] && x[2] == y[2] &&\
                        x[3] == y[3]) ? TRUE : FALSE)

/*
 * The kernel's default umask is 022 these days; since some processes inherit
 * their umask from init, init will set it from CMASK in /etc/default/init.
 * init gets the default umask from the kernel, it sets it to 022 whenever
 * it wants to create a file and reverts to CMASK afterwards.
 */

static int cmask;

/*
 * The following definitions, concluding with the 'lvls' array, provide a
 * common mapping between level-name (like 'S'), signal number (state),
 * run-level mask, and specific properties associated with a run-level.
 * This array should be accessed using the routines lvlname_to_state(),
 * lvlname_to_mask(), state_to_mask(), and state_to_flags().
 */

/*
 * Correspondence of signals to init actions.
 */
#define LVLQ            SIGHUP
#define LVL0            SIGINT
#define LVL1            SIGQUIT
#define LVL2            SIGILL
#define LVL3            SIGTRAP
#define LVL4            SIGIOT
#define LVL5            SIGEMT
#define LVL6            SIGFPE
#define SINGLE_USER     SIGBUS
#define LVLa            SIGSEGV
#define LVLb            SIGSYS
#define LVLc            SIGPIPE

/*
 * Bit Mask for each level.  Used to determine legal levels.
 */
#define MASK0   0x0001
#define MASK1   0x0002
#define MASK2   0x0004
#define MASK3   0x0008
#define MASK4   0x0010
#define MASK5   0x0020
#define MASK6   0x0040
#define MASKSU  0x0080
#define MASKa   0x0100
#define MASKb   0x0200
#define MASKc   0x0400

#define MASK_NUMERIC (MASK0 | MASK1 | MASK2 | MASK3 | MASK4 | MASK5 | MASK6)
#define MASK_abc (MASKa | MASKb | MASKc)

/*
 * Flags to indicate properties of various states.
 */
#define LSEL_RUNLEVEL   0x0001  /* runlevels you can transition to */

typedef struct lvl {
        int     lvl_state;
        int     lvl_mask;
        char    lvl_name;
        int     lvl_flags;
} lvl_t;

static lvl_t lvls[] = {
        { LVLQ,         0,      'Q', 0                                  },
        { LVLQ,         0,      'q', 0                                  },
        { LVL0,         MASK0,  '0', LSEL_RUNLEVEL                      },
        { LVL1,         MASK1,  '1', LSEL_RUNLEVEL                      },
        { LVL2,         MASK2,  '2', LSEL_RUNLEVEL                      },
        { LVL3,         MASK3,  '3', LSEL_RUNLEVEL                      },
        { LVL4,         MASK4,  '4', LSEL_RUNLEVEL                      },
        { LVL5,         MASK5,  '5', LSEL_RUNLEVEL                      },
        { LVL6,         MASK6,  '6', LSEL_RUNLEVEL                      },
        { SINGLE_USER,  MASKSU, 'S', LSEL_RUNLEVEL                      },
        { SINGLE_USER,  MASKSU, 's', LSEL_RUNLEVEL                      },
        { LVLa,         MASKa,  'a', 0                                  },
        { LVLb,         MASKb,  'b', 0                                  },
        { LVLc,         MASKc,  'c', 0                                  }
};

#define LVL_NELEMS (sizeof (lvls) / sizeof (lvl_t))

/*
 * Legal action field values.
 */
#define OFF             0       /* Kill process if on, else ignore */
#define RESPAWN         1       /* Continuously restart process when it dies */
#define ONDEMAND        RESPAWN /* Respawn for a, b, c type processes */
#define ONCE            2       /* Start process, do not respawn when dead */
#define WAIT            3       /* Perform once and wait to complete */
#define BOOT            4       /* Start at boot time only */
#define BOOTWAIT        5       /* Start at boot time and wait to complete */
#define POWERFAIL       6       /* Start on powerfail */
#define POWERWAIT       7       /* Start and wait for complete on powerfail */
#define INITDEFAULT     8       /* Default level "init" should start at */
#define SYSINIT         9       /* Actions performed before init speaks */

#define M_OFF           0001
#define M_RESPAWN       0002
#define M_ONDEMAND      M_RESPAWN
#define M_ONCE          0004
#define M_WAIT          0010
#define M_BOOT          0020
#define M_BOOTWAIT      0040
#define M_PF            0100
#define M_PWAIT         0200
#define M_INITDEFAULT   0400
#define M_SYSINIT       01000

/* States for the inittab parser in getcmd(). */
#define ID      1
#define LEVELS  2
#define ACTION  3
#define COMMAND 4
#define COMMENT 5

/*
 * inittab entry id constants
 */
#define INITTAB_ENTRY_ID_SIZE 4
#define INITTAB_ENTRY_ID_STR_FORMAT "%.4s"      /* if INITTAB_ENTRY_ID_SIZE */
                                                /* changes, this should */
                                                /* change accordingly */

/*
 * Init can be in any of three main states, "normal" mode where it is
 * processing entries for the lines file in a normal fashion, "boot" mode,
 * where it is only interested in the boot actions, and "powerfail" mode,
 * where it is only interested in powerfail related actions. The following
 * masks declare the legal actions for each mode.
 */
#define NORMAL_MODES    (M_OFF | M_RESPAWN | M_ONCE | M_WAIT)
#define BOOT_MODES      (M_BOOT | M_BOOTWAIT)
#define PF_MODES        (M_PF | M_PWAIT)

struct PROC_TABLE {
        char    p_id[INITTAB_ENTRY_ID_SIZE];    /* Four letter unique id of */
                                                /* process */
        pid_t   p_pid;          /* Process id */
        short   p_count;        /* How many respawns of this command in */
                                /*   the current series */
        long    p_time;         /* Start time for a series of respawns */
        short   p_flags;
        short   p_exit;         /* Exit status of a process which died */
};

/*
 * Flags for the "p_flags" word of a PROC_TABLE entry:
 *
 *      OCCUPIED        This slot in init's proc table is in use.
 *
 *      LIVING          Process is alive.
 *
 *      NOCLEANUP       efork() is not allowed to cleanup this entry even
 *                      if process is dead.
 *
 *      NAMED           This process has a name, i.e. came from inittab.
 *
 *      DEMANDREQUEST   Process started by a "telinit [abc]" command.  Processes
 *                      formed this way are respawnable and immune to level
 *                      changes as long as their entry exists in inittab.
 *
 *      TOUCHED         Flag used by remv() to determine whether it has looked
 *                      at an entry while checking for processes to be killed.
 *
 *      WARNED          Flag used by remv() to mark processes that have been
 *                      sent the SIGTERM signal.  If they don't die in 5
 *                      seconds, they are sent the SIGKILL signal.
 *
 *      KILLED          Flag used by remv() to mark procs that have been sent
 *                      the SIGTERM and SIGKILL signals.
 *
 *      PF_MASK         Bitwise or of legal flags, for sanity checking.
 */
#define OCCUPIED        01
#define LIVING          02
#define NOCLEANUP       04
#define NAMED           010
#define DEMANDREQUEST   020
#define TOUCHED         040
#define WARNED          0100
#define KILLED          0200
#define PF_MASK         0377

/*
 * Respawn limits for processes that are to be respawned:
 *
 *      SPAWN_INTERVAL  The number of seconds over which "init" will try to
 *                      respawn a process SPAWN_LIMIT times before it gets mad.
 *
 *      SPAWN_LIMIT     The number of respawns "init" will attempt in
 *                      SPAWN_INTERVAL seconds before it generates an
 *                      error message and inhibits further tries for
 *                      INHIBIT seconds.
 *
 *      INHIBIT         The number of seconds "init" ignores an entry it had
 *                      trouble spawning unless a "telinit Q" is received.
 */

#define SPAWN_INTERVAL  (2*60)
#define SPAWN_LIMIT     10
#define INHIBIT         (5*60)

/*
 * The maximum number of decimal digits for an id_t.  (ceil(log10 (max_id)))
 */
#define ID_MAX_STR_LEN  10

#define NULLPROC        ((struct PROC_TABLE *)(0))
#define NO_ROOM         ((struct PROC_TABLE *)(FAILURE))

struct CMD_LINE {
        char c_id[INITTAB_ENTRY_ID_SIZE];       /* Four letter unique id of */
                                                /* process to be affected by */
                                                /* action */
        short c_levels; /* Mask of legal levels for process */
        short c_action; /* Mask for type of action required */
        char *c_command; /* Pointer to init command */
};

struct  pidrec {
        int     pd_type;        /* Command type */
        pid_t   pd_pid;         /* pid to add or remove */
};

/*
 * pd_type's
 */
#define ADDPID  1
#define REMPID  2

static struct   pidlist {
        pid_t   pl_pid;         /* pid to watch for */
        int     pl_dflag;       /* Flag indicating SIGCLD from this pid */
        short   pl_exit;        /* Exit status of proc */
        struct  pidlist *pl_next; /* Next in list */
} *Plhead, *Plfree;

/*
 * The following structure contains a set of modes for /dev/syscon
 * and should match the default contents of /etc/ioctl.syscon.  It should also
 * be kept in-sync with base_termios in uts/common/io/ttcompat.c.
 */
static struct termios   dflt_termios = {
        BRKINT|ICRNL|IXON|IMAXBEL,                      /* iflag */
        OPOST|ONLCR|TAB3,                               /* oflag */
        CS8|CREAD|B9600,                                /* cflag */
        ISIG|ICANON|ECHO|ECHOE|ECHOK|ECHOCTL|ECHOKE|IEXTEN, /* lflag */
        CINTR, CQUIT, CERASE, CKILL, CEOF, 0, 0, 0,
        0, 0, 0, 0, 0, 0, 0, 0,
        0, 0, 0
};

static struct termios   stored_syscon_termios;
static int              write_ioctl = 0;        /* Rewrite /etc/ioctl.syscon */

static union WAKEUP {
        struct WAKEFLAGS {
                unsigned w_usersignal : 1;      /* User sent signal to "init" */
                unsigned w_childdeath : 1;      /* An "init" child died */
                unsigned w_powerhit : 1;        /* OS experienced powerfail */
        }       w_flags;
        int w_mask;
} wakeup;


struct init_state {
        int                     ist_runlevel;
        int                     ist_num_proc;
        int                     ist_utmpx_ok;
        struct PROC_TABLE       ist_proc_table[1];
};

#define cur_state       (g_state->ist_runlevel)
#define num_proc        (g_state->ist_num_proc)
#define proc_table      (g_state->ist_proc_table)
#define utmpx_ok        (g_state->ist_utmpx_ok)

/* Contract cookies. */
#define ORDINARY_COOKIE         0
#define STARTD_COOKIE           1


#ifndef NDEBUG
#define bad_error(func, err)    {                                       \
        (void) fprintf(stderr, "%s:%d: %s() failed with unexpected "    \
            "error %d.  Aborting.\n", __FILE__, __LINE__, (func), (err)); \
        abort();                                                        \
}
#else
#define bad_error(func, err)    abort()
#endif


/*
 * Useful file and device names.
 */
static char *CONSOLE      = "/dev/console";     /* Real system console */
static char *INITPIPE_DIR = "/var/run";
static char *INITPIPE     = "/var/run/initpipe";

#define INIT_STATE_DIR "/etc/svc/volatile"
static const char * const init_state_file = INIT_STATE_DIR "/init.state";
static const char * const init_next_state_file =
        INIT_STATE_DIR "/init-next.state";

static const int init_num_proc = 20;    /* Initial size of process table. */

static char *UTMPX       = UTMPX_FILE;          /* Snapshot record file */
static char *WTMPX       = WTMPX_FILE;          /* Long term record file */
static char *INITTAB     = "/etc/inittab";      /* Script file for "init" */
static char *SYSTTY      = "/dev/systty";       /* System Console */
static char *SYSCON      = "/dev/syscon";       /* Virtual System console */
static char *IOCTLSYSCON = "/etc/ioctl.syscon"; /* Last syscon modes */
static char *ENVFILE     = "/etc/default/init"; /* Default env. */
static char *SU = "/etc/sulogin";       /* Super-user program for single user */
static char *SH = "/sbin/sh";           /* Standard shell */

/*
 * Default Path.  /sbin is included in path only during sysinit phase
 */
#define DEF_PATH        "PATH=/usr/sbin:/usr/bin"
#define INIT_PATH       "PATH=/sbin:/usr/sbin:/usr/bin"

static int      prior_state;
static int      prev_state;     /* State "init" was in last time it woke */
static int      new_state;      /* State user wants "init" to go to. */
static int      lvlq_received;  /* Explicit request to examine state */
static int      op_modes = BOOT_MODES; /* Current state of "init" */
static int      Gchild = 0;     /* Flag to indicate "godchild" died, set in */
                                /*   childeath() and cleared in cleanaux() */
static int      Pfd = -1;       /* fd to receive pids thru */
static unsigned int     spawncnt, pausecnt;
static int      rsflag;         /* Set if a respawn has taken place */
static volatile int time_up;    /* Flag set to TRUE by the alarm interrupt */
                                /* routine each time an alarm interrupt */
                                /* takes place. */
static int      sflg = 0;       /* Set if we were booted -s to single user */
static int      rflg = 0;       /* Set if booted -r, reconfigure devices */
static int      bflg = 0;       /* Set if booted -b, don't run rc scripts */
static pid_t    init_pid;       /* PID of "one true" init for current zone */

static struct init_state *g_state = NULL;
static size_t   g_state_sz;
static int      booting = 1;    /* Set while we're booting. */

/*
 * Array for default global environment.
 */
#define MAXENVENT       24      /* Max number of default env variables + 1 */
                                /* init can use three itself, so this leaves */
                                /* 20 for the administrator in ENVFILE. */
static char     *glob_envp[MAXENVENT];  /* Array of environment strings */
static int      glob_envn;              /* Number of environment strings */


static struct pollfd    poll_fds[1];
static int              poll_nfds = 0;  /* poll_fds is uninitialized */

/*
 * Contracts constants
 */
#define SVC_INIT_PREFIX "init:/"
#define SVC_AUX_SIZE (INITTAB_ENTRY_ID_SIZE + 1)
#define SVC_FMRI_SIZE (sizeof (SVC_INIT_PREFIX) + INITTAB_ENTRY_ID_SIZE)

static int      legacy_tmpl = -1;       /* fd for legacy contract template */
static int      startd_tmpl = -1;       /* fd for svc.startd's template */
static char     startd_svc_aux[SVC_AUX_SIZE];

static char     startd_cline[256] = ""; /* svc.startd's command line */
static int      do_restart_startd = 1;  /* Whether to restart svc.startd. */
static char     *smf_options = NULL;    /* Options to give to startd. */
static int      smf_debug = 0;          /* Messages for debugging smf(5) */
static time_t   init_boot_time;         /* Substitute for kernel boot time. */

#define NSTARTD_FAILURE_TIMES   3               /* trigger after 3 failures */
#define STARTD_FAILURE_RATE_NS  5000000000LL    /* 1 failure/5 seconds */

static hrtime_t startd_failure_time[NSTARTD_FAILURE_TIMES];
static uint_t   startd_failure_index;


static char     *prog_name(char *);
static int      state_to_mask(int);
static int      lvlname_to_mask(char, int *);
static void     lscf_set_runlevel(char);
static int      state_to_flags(int);
static char     state_to_name(int);
static int      lvlname_to_state(char);
static int      getcmd(struct CMD_LINE *, char *);
static int      realcon();
static int      spawn_processes();
static int      get_ioctl_syscon();
static int      account(short, struct PROC_TABLE *, char *);
static void     alarmclk();
static void     childeath(int);
static void     cleanaux();
static void     clearent(pid_t, short);
static void     console(boolean_t, char *, ...);
static void     init_signals(void);
static void     setup_pipe();
static void     killproc(pid_t);
static void     init_env();
static void     boot_init();
static void     powerfail();
static void     remv();
static void     write_ioctl_syscon();
static void     spawn(struct PROC_TABLE *, struct CMD_LINE *);
static void     setimer(int);
static void     siglvl(int, siginfo_t *, ucontext_t *);
static void     sigpoll(int);
static void     enter_maintenance(void);
static void     timer(int);
static void     userinit(int, char **);
static void     notify_pam_dead(struct utmpx *);
static long     waitproc(struct PROC_TABLE *);
static struct PROC_TABLE *efork(int, struct PROC_TABLE *, int);
static struct PROC_TABLE *findpslot(struct CMD_LINE *);
static void     increase_proc_table_size();
static void     st_init();
static void     st_write();
static void     contracts_init();
static void     contract_event(struct pollfd *);
static int      startd_run(const char *, int, ctid_t);
static void     startd_record_failure();
static int      startd_failure_rate_critical();
static char     *audit_boot_msg();
static int      audit_put_record(int, int, char *);
static void     update_boot_archive(int new_state);

int
main(int argc, char *argv[])
{
        int     chg_lvl_flag = FALSE, print_banner = FALSE;
        int     may_need_audit = 1;
        int     c;
        char    *msg;

        /* Get a timestamp for use as boot time, if needed. */
        (void) time(&init_boot_time);

        /* Get the default umask */
        cmask = umask(022);
        (void) umask(cmask);

        /* Parse the arguments to init. Check for single user */
        opterr = 0;
        while ((c = getopt(argc, argv, "brsm:")) != EOF) {
                switch (c) {
                case 'b':
                        rflg = 0;
                        bflg = 1;
                        if (!sflg)
                                sflg++;
                        break;
                case 'r':
                        bflg = 0;
                        rflg++;
                        break;
                case 's':
                        if (!bflg)
                                sflg++;
                        break;
                case 'm':
                        smf_options = optarg;
                        smf_debug = (strstr(smf_options, "debug") != NULL);
                        break;
                }
        }

        /*
         * Determine if we are the main init, or a user invoked init, whose job
         * it is to inform init to change levels or perform some other action.
         */
        if (zone_getattr(getzoneid(), ZONE_ATTR_INITPID, &init_pid,
            sizeof (init_pid)) != sizeof (init_pid)) {
                (void) fprintf(stderr, "could not get pid for init\n");
                return (1);
        }

        /*
         * If this PID is not the same as the "true" init for the zone, then we
         * must be in 'user' mode.
         */
        if (getpid() != init_pid) {
                userinit(argc, argv);
        }

        if (getzoneid() != GLOBAL_ZONEID) {
                print_banner = TRUE;
        }

        /*
         * Initialize state (and set "booting").
         */
        st_init();

        if (booting && print_banner) {
                struct utsname un;
                char buf[BUFSIZ], *isa;
                long ret;
                int bits = 32;

                /*
                 * We want to print the boot banner as soon as
                 * possible.  In the global zone, the kernel does it,
                 * but we do not have that luxury in non-global zones,
                 * so we will print it here.
                 */
                (void) uname(&un);
                ret = sysinfo(SI_ISALIST, buf, sizeof (buf));
                if (ret != -1L && ret <= sizeof (buf)) {
                        for (isa = strtok(buf, " "); isa;
                            isa = strtok(NULL, " ")) {
                                if (strcmp(isa, "sparcv9") == 0 ||
                                    strcmp(isa, "amd64") == 0) {
                                        bits = 64;
                                        break;
                                }
                        }
                }

                console(B_FALSE,
                    "\n\n%s Release %s Version %s %d-bit\r\n",
                    un.sysname, un.release, un.version, bits);
                console(B_FALSE,
                    "Copyright (c) 1983, 2010, Oracle and/or its affiliates."
                    " All rights reserved.\r\n");
        }

        /*
         * Get the ioctl settings for /dev/syscon from /etc/ioctl.syscon
         * so that it can be brought up in the state it was in when the
         * system went down; or set to defaults if ioctl.syscon isn't
         * valid.
         *
         * This needs to be done even if we're restarting so reset_modes()
         * will work in case we need to go down to single user mode.
         */
        write_ioctl = get_ioctl_syscon();

        /*
         * Set up all signals to be caught or ignored as appropriate.
         */
        init_signals();

        /* Load glob_envp from ENVFILE. */
        init_env();

        contracts_init();

        if (!booting) {
                /* cur_state should have been read in. */

                op_modes = NORMAL_MODES;

                /* Rewrite the ioctl file if it was bad. */
                if (write_ioctl)
                        write_ioctl_syscon();
        } else {
                /*
                 * It's fine to boot up with state as zero, because
                 * startd will later tell us the real state.
                 */
                cur_state = 0;
                op_modes = BOOT_MODES;

                boot_init();
        }

        prev_state = prior_state = cur_state;

        setup_pipe();

        /*
         * Here is the beginning of the main process loop.
         */
        for (;;) {
                if (lvlq_received) {
                        setup_pipe();
                        lvlq_received = B_FALSE;
                }

                /*
                 * Clean up any accounting records for dead "godchildren".
                 */
                if (Gchild)
                        cleanaux();

                /*
                 * If in "normal" mode, check all living processes and initiate
                 * kill sequence on those that should not be there anymore.
                 */
                if (op_modes == NORMAL_MODES && cur_state != LVLa &&
                    cur_state != LVLb && cur_state != LVLc)
                        remv();

                /*
                 * If a change in run levels is the reason we awoke, now do
                 * the accounting to report the change in the utmp file.
                 * Also report the change on the system console.
                 */
                if (chg_lvl_flag) {
                        chg_lvl_flag = FALSE;

                        if (state_to_flags(cur_state) & LSEL_RUNLEVEL) {
                                char rl = state_to_name(cur_state);

                                if (rl != -1)
                                        lscf_set_runlevel(rl);
                        }

                        may_need_audit = 1;
                }

                /*
                 * Scan the inittab file and spawn and respawn processes that
                 * should be alive in the current state. If inittab does not
                 * exist default to  single user mode.
                 */
                if (spawn_processes() == FAILURE) {
                        prior_state = prev_state;
                        cur_state = SINGLE_USER;
                }

                /* If any respawns occurred, take note. */
                if (rsflag) {
                        rsflag = 0;
                        spawncnt++;
                }

                /*
                 * If a powerfail signal was received during the last
                 * sequence, set mode to powerfail.  When spawn_processes() is
                 * entered the first thing it does is to check "powerhit".  If
                 * it is in PF_MODES then it clears "powerhit" and does
                 * a powerfail sequence.  If it is not in PF_MODES, then it
                 * puts itself in PF_MODES and then clears "powerhit".  Should
                 * "powerhit" get set again while spawn_processes() is working
                 * on a powerfail sequence, the following code  will see that
                 * spawn_processes() tries to execute the powerfail sequence
                 * again.  This guarantees that the powerfail sequence will be
                 * successfully completed before further processing takes
                 * place.
                 */
                if (wakeup.w_flags.w_powerhit) {
                        op_modes = PF_MODES;
                        /*
                         * Make sure that cur_state != prev_state so that
                         * ONCE and WAIT types work.
                         */
                        prev_state = 0;
                } else if (op_modes != NORMAL_MODES) {
                        /*
                         * If spawn_processes() was not just called while in
                         * normal mode, we set the mode to normal and it will
                         * be called again to check normal modes.  If we have
                         * just finished a powerfail sequence with prev_state
                         * equal to zero, we set prev_state equal to cur_state
                         * before the next pass through.
                         */
                        if (op_modes == PF_MODES)
                                prev_state = cur_state;
                        op_modes = NORMAL_MODES;
                } else if (cur_state == LVLa || cur_state == LVLb ||
                    cur_state == LVLc) {
                        /*
                         * If it was a change of levels that awakened us and the
                         * new level is one of the demand levels then reset
                         * cur_state to the previous state and do another scan
                         * to take care of the usual respawn actions.
                         */
                        cur_state = prior_state;
                        prior_state = prev_state;
                        prev_state = cur_state;
                } else {
                        prev_state = cur_state;

                        if (wakeup.w_mask == 0) {
                                int ret;

                                if (may_need_audit && (cur_state == LVL3)) {
                                        msg = audit_boot_msg();

                                        may_need_audit = 0;
                                        (void) audit_put_record(ADT_SUCCESS,
                                            ADT_SUCCESS, msg);
                                        free(msg);
                                }

                                /*
                                 * "init" is finished with all actions for
                                 * the current wakeup.
                                 */
                                ret = poll(poll_fds, poll_nfds,
                                    SLEEPTIME * MILLISEC);
                                pausecnt++;
                                if (ret > 0)
                                        contract_event(&poll_fds[0]);
                                else if (ret < 0 && errno != EINTR)
                                        console(B_TRUE, "poll() error: %s\n",
                                            strerror(errno));
                        }

                        if (wakeup.w_flags.w_usersignal) {
                                /*
                                 * Install the new level.  This could be a real
                                 * change in levels  or a telinit [Q|a|b|c] or
                                 * just a telinit to the same level at which
                                 * we are running.
                                 */
                                if (new_state != cur_state) {
                                        if (new_state == LVLa ||
                                            new_state == LVLb ||
                                            new_state == LVLc) {
                                                prev_state = prior_state;
                                                prior_state = cur_state;
                                                cur_state = new_state;
                                        } else {
                                                prev_state = cur_state;
                                                if (cur_state >= 0)
                                                        prior_state = cur_state;
                                                cur_state = new_state;
                                                chg_lvl_flag = TRUE;
                                        }
                                }

                                new_state = 0;
                        }

                        if (wakeup.w_flags.w_powerhit)
                                op_modes = PF_MODES;

                        /*
                         * Clear all wakeup reasons.
                         */
                        wakeup.w_mask = 0;
                }
        }

        /*NOTREACHED*/
}

static void
update_boot_archive(int new_state)
{
        if (new_state != LVL0 && new_state != LVL5 && new_state != LVL6)
                return;

        if (getzoneid() != GLOBAL_ZONEID)
                return;

        (void) system("/sbin/bootadm -a update_all");
}

/*
 * void enter_maintenance()
 *   A simple invocation of sulogin(1M), with no baggage, in the case that we
 *   are unable to activate svc.startd(1M).  We fork; the child runs sulogin;
 *   we wait for it to exit.
 */
static void
enter_maintenance()
{
        struct PROC_TABLE       *su_process;

        console(B_FALSE, "Requesting maintenance mode\n"
            "(See /lib/svc/share/README for additional information.)\n");
        (void) sighold(SIGCLD);
        while ((su_process = efork(M_OFF, NULLPROC, NOCLEANUP)) == NO_ROOM)
                (void) pause();
        (void) sigrelse(SIGCLD);
        if (su_process == NULLPROC) {
                int fd;

                (void) fclose(stdin);
                (void) fclose(stdout);
                (void) fclose(stderr);
                closefrom(0);

                fd = open(SYSCON, O_RDWR | O_NOCTTY);
                if (fd >= 0) {
                        (void) dup2(fd, 1);
                        (void) dup2(fd, 2);
                } else {
                        /*
                         * Need to issue an error message somewhere.
                         */
                        syslog(LOG_CRIT, "init[%d]: cannot open %s; %s\n",
                            getpid(), SYSCON, strerror(errno));
                }

                /*
                 * Execute the "su" program.
                 */
                (void) execle(SU, SU, "-", (char *)0, glob_envp);
                console(B_TRUE, "execle of %s failed: %s\n", SU,
                    strerror(errno));
                timer(5);
                exit(1);
        }

        /*
         * If we are the parent, wait around for the child to die
         * or for "init" to be signaled to change levels.
         */
        while (waitproc(su_process) == FAILURE) {
                /*
                 * All other reasons for waking are ignored when in
                 * single-user mode.  The only child we are interested
                 * in is being waited for explicitly by waitproc().
                 */
                wakeup.w_mask = 0;
        }
}

/*
 * remv() scans through "proc_table" and performs cleanup.  If
 * there is a process in the table, which shouldn't be here at
 * the current run level, then remv() kills the process.
 */
static void
remv()
{
        struct PROC_TABLE       *process;
        struct CMD_LINE         cmd;
        char                    cmd_string[MAXCMDL];
        int                     change_level;

        change_level = (cur_state != prev_state ? TRUE : FALSE);

        /*
         * Clear the TOUCHED flag on all entries so that when we have
         * finished scanning inittab, we will be able to tell if we
         * have any processes for which there is no entry in inittab.
         */
        for (process = proc_table;
            (process < proc_table + num_proc); process++) {
                process->p_flags &= ~TOUCHED;
        }

        /*
         * Scan all inittab entries.
         */
        while (getcmd(&cmd, &cmd_string[0]) == TRUE) {
                /* Scan for process which goes with this entry in inittab. */
                for (process = proc_table;
                    (process < proc_table + num_proc); process++) {
                        if ((process->p_flags & OCCUPIED) == 0 ||
                            !id_eq(process->p_id, cmd.c_id))
                                continue;

                        /*
                         * This slot contains the process we are looking for.
                         */

                        /*
                         * Is the cur_state SINGLE_USER or is this process
                         * marked as "off" or was this proc started by some
                         * mechanism other than LVL{a|b|c} and the current level
                         * does not support this process?
                         */
                        if (cur_state == SINGLE_USER ||
                            cmd.c_action == M_OFF ||
                            ((cmd.c_levels & state_to_mask(cur_state)) == 0 &&
                            (process->p_flags & DEMANDREQUEST) == 0)) {
                                if (process->p_flags & LIVING) {
                                        /*
                                         * Touch this entry so we know we have
                                         * treated it.  Note that procs which
                                         * are already dead at this point and
                                         * should not be restarted are left
                                         * untouched.  This causes their slot to
                                         * be freed later after dead accounting
                                         * is done.
                                         */
                                        process->p_flags |= TOUCHED;

                                        if ((process->p_flags & KILLED) == 0) {
                                                if (change_level) {
                                                        process->p_flags
                                                            |= WARNED;
                                                        (void) kill(
                                                            process->p_pid,
                                                            SIGTERM);
                                                } else {
                                                        /*
                                                         * Fork a killing proc
                                                         * so "init" can
                                                         * continue without
                                                         * having to pause for
                                                         * TWARN seconds.
                                                         */
                                                        killproc(
                                                            process->p_pid);
                                                }
                                                process->p_flags |= KILLED;
                                        }
                                }
                        } else {
                                /*
                                 * Process can exist at current level.  If it is
                                 * still alive or a DEMANDREQUEST we touch it so
                                 * it will be left alone.  Otherwise we leave it
                                 * untouched so it will be accounted for and
                                 * cleaned up later in remv().  Dead
                                 * DEMANDREQUESTs will be accounted but not
                                 * freed.
                                 */
                                if (process->p_flags &
                                    (LIVING|NOCLEANUP|DEMANDREQUEST))
                                        process->p_flags |= TOUCHED;
                        }

                        break;
                }
        }

        st_write();

        /*
         * If this was a change of levels call, scan through the
         * process table for processes that were warned to die.  If any
         * are found that haven't left yet, sleep for TWARN seconds and
         * then send final terminations to any that haven't died yet.
         */
        if (change_level) {

                /*
                 * Set the alarm for TWARN seconds on the assumption
                 * that there will be some that need to be waited for.
                 * This won't harm anything except we are guaranteed to
                 * wakeup in TWARN seconds whether we need to or not.
                 */
                setimer(TWARN);

                /*
                 * Scan for processes which should be dying.  We hope they
                 * will die without having to be sent a SIGKILL signal.
                 */
                for (process = proc_table;
                    (process < proc_table + num_proc); process++) {
                        /*
                         * If this process should die, hasn't yet, and the
                         * TWARN time hasn't expired yet, wait for process
                         * to die or for timer to expire.
                         */
                        while (time_up == FALSE &&
                            (process->p_flags & (WARNED|LIVING|OCCUPIED)) ==
                            (WARNED|LIVING|OCCUPIED))
                                (void) pause();

                        if (time_up == TRUE)
                                break;
                }

                /*
                 * If we reached the end of the table without the timer
                 * expiring, then there are no procs which will have to be
                 * sent the SIGKILL signal.  If the timer has expired, then
                 * it is necessary to scan the table again and send signals
                 * to all processes which aren't going away nicely.
                 */
                if (time_up == TRUE) {
                        for (process = proc_table;
                            (process < proc_table + num_proc); process++) {
                                if ((process->p_flags &
                                    (WARNED|LIVING|OCCUPIED)) ==
                                    (WARNED|LIVING|OCCUPIED))
                                        (void) kill(process->p_pid, SIGKILL);
                        }
                }
                setimer(0);
        }

        /*
         * Rescan the proc_table for two kinds of entry, those marked LIVING,
         * NAMED, which don't have an entry in inittab (haven't been TOUCHED
         * by the above scanning), and haven't been sent kill signals, and
         * those entries marked not LIVING, NAMED.  The former procs are killed.
         * The latter have DEAD_PROCESS accounting done and the slot cleared.
         */
        for (process = proc_table;
            (process < proc_table + num_proc); process++) {
                if ((process->p_flags & (LIVING|NAMED|TOUCHED|KILLED|OCCUPIED))
                    == (LIVING|NAMED|OCCUPIED)) {
                        killproc(process->p_pid);
                        process->p_flags |= KILLED;
                } else if ((process->p_flags & (LIVING|NAMED|OCCUPIED)) ==
                    (NAMED|OCCUPIED)) {
                        (void) account(DEAD_PROCESS, process, NULL);
                        /*
                         * If this named proc hasn't been TOUCHED, then free the
                         * space. It has either died of it's own accord, but
                         * isn't respawnable or it was killed because it
                         * shouldn't exist at this level.
                         */
                        if ((process->p_flags & TOUCHED) == 0)
                                process->p_flags = 0;
                }
        }

        st_write();
}

/*
 * Extract the svc.startd command line and whether to restart it from its
 * inittab entry.
 */
/*ARGSUSED*/
static void
process_startd_line(struct CMD_LINE *cmd, char *cmd_string)
{
        size_t sz;

        /* Save the command line. */
        if (sflg || rflg) {
                /* Also append -r or -s. */
                (void) strlcpy(startd_cline, cmd_string, sizeof (startd_cline));
                (void) strlcat(startd_cline, " -", sizeof (startd_cline));
                if (sflg)
                        sz = strlcat(startd_cline, "s", sizeof (startd_cline));
                if (rflg)
                        sz = strlcat(startd_cline, "r", sizeof (startd_cline));
        } else {
                sz = strlcpy(startd_cline, cmd_string, sizeof (startd_cline));
        }

        if (sz >= sizeof (startd_cline)) {
                console(B_TRUE,
                    "svc.startd command line too long.  Ignoring.\n");
                startd_cline[0] = '\0';
                return;
        }
}

/*
 * spawn_processes() scans inittab for entries which should be run at this
 * mode.  Processes which should be running but are not, are started.
 */
static int
spawn_processes()
{
        struct PROC_TABLE               *pp;
        struct CMD_LINE                 cmd;
        char                            cmd_string[MAXCMDL];
        short                           lvl_mask;
        int                             status;

        /*
         * First check the "powerhit" flag.  If it is set, make sure the modes
         * are PF_MODES and clear the "powerhit" flag.  Avoid the possible race
         * on the "powerhit" flag by disallowing a new powerfail interrupt
         * between the test of the powerhit flag and the clearing of it.
         */
        if (wakeup.w_flags.w_powerhit) {
                wakeup.w_flags.w_powerhit = 0;
                op_modes = PF_MODES;
        }
        lvl_mask = state_to_mask(cur_state);

        /*
         * Scan through all the entries in inittab.
         */
        while ((status = getcmd(&cmd, &cmd_string[0])) == TRUE) {
                if (id_eq(cmd.c_id, "smf")) {
                        process_startd_line(&cmd, cmd_string);
                        continue;
                }

retry_for_proc_slot:

                /*
                 * Find out if there is a process slot for this entry already.
                 */
                if ((pp = findpslot(&cmd)) == NULLPROC) {
                        /*
                         * we've run out of proc table entries
                         * increase proc_table.
                         */
                        increase_proc_table_size();

                        /*
                         * Retry now as we have an empty proc slot.
                         * In case increase_proc_table_size() fails,
                         * we will keep retrying.
                         */
                        goto retry_for_proc_slot;
                }

                /*
                 * If there is an entry, and it is marked as DEMANDREQUEST,
                 * one of the levels a, b, or c is in its levels mask, and
                 * the action field is ONDEMAND and ONDEMAND is a permissable
                 * mode, and the process is dead, then respawn it.
                 */
                if (((pp->p_flags & (LIVING|DEMANDREQUEST)) == DEMANDREQUEST) &&
                    (cmd.c_levels & MASK_abc) &&
                    (cmd.c_action & op_modes) == M_ONDEMAND) {
                        spawn(pp, &cmd);
                        continue;
                }

                /*
                 * If the action is not an action we are interested in,
                 * skip the entry.
                 */
                if ((cmd.c_action & op_modes) == 0 || pp->p_flags & LIVING ||
                    (cmd.c_levels & lvl_mask) == 0)
                        continue;

                /*
                 * If the modes are the normal modes (ONCE, WAIT, RESPAWN, OFF,
                 * ONDEMAND) and the action field is either OFF or the action
                 * field is ONCE or WAIT and the current level is the same as
                 * the last level, then skip this entry.  ONCE and WAIT only
                 * get run when the level changes.
                 */
                if (op_modes == NORMAL_MODES &&
                    (cmd.c_action == M_OFF ||
                    (cmd.c_action & (M_ONCE|M_WAIT)) &&
                    cur_state == prev_state))
                        continue;

                /*
                 * At this point we are interested in performing the action for
                 * this entry.  Actions fall into two categories, spinning off
                 * a process and not waiting, and spinning off a process and
                 * waiting for it to die.  If the action is ONCE, RESPAWN,
                 * ONDEMAND, POWERFAIL, or BOOT we don't wait for the process
                 * to die, for all other actions we do wait.
                 */
                if (cmd.c_action & (M_ONCE | M_RESPAWN | M_PF | M_BOOT)) {
                        spawn(pp, &cmd);

                } else {
                        spawn(pp, &cmd);
                        while (waitproc(pp) == FAILURE)
                                ;
                        (void) account(DEAD_PROCESS, pp, NULL);
                        pp->p_flags = 0;
                }
        }
        return (status);
}

/*
 * spawn() spawns a shell, inserts the information about the process
 * process into the proc_table, and does the startup accounting.
 */
static void
spawn(struct PROC_TABLE *process, struct CMD_LINE *cmd)
{
        int             i;
        int             modes, maxfiles;
        time_t          now;
        struct PROC_TABLE tmproc, *oprocess;

        /*
         * The modes to be sent to efork() are 0 unless we are
         * spawning a LVLa, LVLb, or LVLc entry or we will be
         * waiting for the death of the child before continuing.
         */
        modes = NAMED;
        if (process->p_flags & DEMANDREQUEST || cur_state == LVLa ||
            cur_state == LVLb || cur_state == LVLc)
                modes |= DEMANDREQUEST;
        if ((cmd->c_action & (M_SYSINIT | M_WAIT | M_BOOTWAIT | M_PWAIT)) != 0)
                modes |= NOCLEANUP;

        /*
         * If this is a respawnable process, check the threshold
         * information to avoid excessive respawns.
         */
        if (cmd->c_action & M_RESPAWN) {
                /*
                 * Add NOCLEANUP to all respawnable commands so that the
                 * information about the frequency of respawns isn't lost.
                 */
                modes |= NOCLEANUP;
                (void) time(&now);

                /*
                 * If no time is assigned, then this is the first time
                 * this command is being processed in this series.  Assign
                 * the current time.
                 */
                if (process->p_time == 0L)
                        process->p_time = now;

                if (process->p_count++ == SPAWN_LIMIT) {

                        if ((now - process->p_time) < SPAWN_INTERVAL) {
                                /*
                                 * Process is respawning too rapidly.  Print
                                 * message and refuse to respawn it for now.
                                 */
                                console(B_TRUE, "Command is respawning too "
                                    "rapidly. Check for possible errors.\n"
                                    "id:%4s \"%s\"\n",
                                    &cmd->c_id[0], &cmd->c_command[EXEC]);
                                return;
                        }
                        process->p_time = now;
                        process->p_count = 0;

                } else if (process->p_count > SPAWN_LIMIT) {
                        /*
                         * If process has been respawning too rapidly and
                         * the inhibit time limit hasn't expired yet, we
                         * refuse to respawn.
                         */
                        if (now - process->p_time < SPAWN_INTERVAL + INHIBIT)
                                return;
                        process->p_time = now;
                        process->p_count = 0;
                }
                rsflag = TRUE;
        }

        /*
         * Spawn a child process to execute this command.
         */
        (void) sighold(SIGCLD);
        oprocess = process;
        while ((process = efork(cmd->c_action, oprocess, modes)) == NO_ROOM)
                (void) pause();

        if (process == NULLPROC) {

                /*
                 * We are the child.  We must make sure we get a different
                 * file pointer for our references to utmpx.  Otherwise our
                 * seeks and reads will compete with those of the parent.
                 */
                endutxent();

                /*
                 * Perform the accounting for the beginning of a process.
                 * Note that all processes are initially "INIT_PROCESS"es.
                 */
                tmproc.p_id[0] = cmd->c_id[0];
                tmproc.p_id[1] = cmd->c_id[1];
                tmproc.p_id[2] = cmd->c_id[2];
                tmproc.p_id[3] = cmd->c_id[3];
                tmproc.p_pid = getpid();
                tmproc.p_exit = 0;
                (void) account(INIT_PROCESS, &tmproc,
                    prog_name(&cmd->c_command[EXEC]));
                maxfiles = ulimit(UL_GDESLIM, 0);
                for (i = 0; i < maxfiles; i++)
                        (void) fcntl(i, F_SETFD, FD_CLOEXEC);

                /*
                 * Now exec a shell with the -c option and the command
                 * from inittab.
                 */
                (void) execle(SH, "INITSH", "-c", cmd->c_command, (char *)0,
                    glob_envp);
                console(B_TRUE, "Command\n\"%s\"\n failed to execute.  errno "
                    "= %d (exec of shell failed)\n", cmd->c_command, errno);

                /*
                 * Don't come back so quickly that "init" doesn't have a
                 * chance to finish putting this child in "proc_table".
                 */
                timer(20);
                exit(1);

        }

        /*
         * We are the parent.  Insert the necessary
         * information in the proc_table.
         */
        process->p_id[0] = cmd->c_id[0];
        process->p_id[1] = cmd->c_id[1];
        process->p_id[2] = cmd->c_id[2];
        process->p_id[3] = cmd->c_id[3];

        st_write();

        (void) sigrelse(SIGCLD);
}

/*
 * findpslot() finds the old slot in the process table for the
 * command with the same id, or it finds an empty slot.
 */
static struct PROC_TABLE *
findpslot(struct CMD_LINE *cmd)
{
        struct PROC_TABLE       *process;
        struct PROC_TABLE       *empty = NULLPROC;

        for (process = proc_table;
            (process < proc_table + num_proc); process++) {
                if (process->p_flags & OCCUPIED &&
                    id_eq(process->p_id, cmd->c_id))
                        break;

                /*
                 * If the entry is totally empty and "empty" is still 0,
                 * remember where this hole is and make sure the slot is
                 * zeroed out.
                 */
                if (empty == NULLPROC && (process->p_flags & OCCUPIED) == 0) {
                        empty = process;
                        process->p_id[0] = '\0';
                        process->p_id[1] = '\0';
                        process->p_id[2] = '\0';
                        process->p_id[3] = '\0';
                        process->p_pid = 0;
                        process->p_time = 0L;
                        process->p_count = 0;
                        process->p_flags = 0;
                        process->p_exit = 0;
                }
        }

        /*
         * If there is no entry for this slot, then there should be an
         * empty slot.  If there is no empty slot, then we've run out
         * of proc_table space.  If the latter is true, empty will be
         * NULL and the caller will have to complain.
         */
        if (process == (proc_table + num_proc))
                process = empty;

        return (process);
}

/*
 * getcmd() parses lines from inittab.  Each time it finds a command line
 * it will return TRUE as well as fill the passed CMD_LINE structure and
 * the shell command string.  When the end of inittab is reached, FALSE
 * is returned inittab is automatically opened if it is not currently open
 * and is closed when the end of the file is reached.
 */
static FILE *fp_inittab = NULL;

static int
getcmd(struct CMD_LINE *cmd, char *shcmd)
{
        char    *ptr;
        int     c, lastc, state;
        char    *ptr1;
        int     answer, i, proceed;
        struct  stat    sbuf;
        static char *actions[] = {
                "off", "respawn", "ondemand", "once", "wait", "boot",
                "bootwait", "powerfail", "powerwait", "initdefault",
                "sysinit",
        };
        static short act_masks[] = {
                M_OFF, M_RESPAWN, M_ONDEMAND, M_ONCE, M_WAIT, M_BOOT,
                M_BOOTWAIT, M_PF, M_PWAIT, M_INITDEFAULT, M_SYSINIT,
        };
        /*
         * Only these actions will be allowed for entries which
         * are specified for single-user mode.
         */
        short su_acts = M_INITDEFAULT | M_PF | M_PWAIT | M_WAIT;

        if (fp_inittab == NULL) {
                /*
                 * Before attempting to open inittab we stat it to make
                 * sure it currently exists and is not empty.  We try
                 * several times because someone may have temporarily
                 * unlinked or truncated the file.
                 */
                for (i = 0; i < 3; i++) {
                        if (stat(INITTAB, &sbuf) == -1) {
                                if (i == 2) {
                                        console(B_TRUE,
                                            "Cannot stat %s, errno: %d\n",
                                            INITTAB, errno);
                                        return (FAILURE);
                                } else {
                                        timer(3);
                                }
                        } else if (sbuf.st_size < 10) {
                                if (i == 2) {
                                        console(B_TRUE,
                                            "%s truncated or corrupted\n",
                                            INITTAB);
                                        return (FAILURE);
                                } else {
                                        timer(3);
                                }
                        } else {
                                break;
                        }
                }

                /*
                 * If unable to open inittab, print error message and
                 * return FAILURE to caller.
                 */
                if ((fp_inittab = fopen(INITTAB, "r")) == NULL) {
                        console(B_TRUE, "Cannot open %s errno: %d\n", INITTAB,
                            errno);
                        return (FAILURE);
                }
        }

        /*
         * Keep getting commands from inittab until you find a
         * good one or run out of file.
         */
        for (answer = FALSE; answer == FALSE; ) {
                /*
                 * Zero out the cmd itself before trying next line.
                 */
                bzero(cmd, sizeof (struct CMD_LINE));

                /*
                 * Read in lines of inittab, parsing at colons, until a line is
                 * read in which doesn't end with a backslash.  Do not start if
                 * the first character read is an EOF.  Note that this means
                 * that lines which don't end in a newline are still processed,
                 * since the "for" will terminate normally once started,
                 * regardless of whether line terminates with a newline or EOF.
                 */
                state = FAILURE;
                if ((c = fgetc(fp_inittab)) == EOF) {
                        answer = FALSE;
                        (void) fclose(fp_inittab);
                        fp_inittab = NULL;
                        break;
                }

                for (proceed = TRUE, ptr = shcmd, state = ID, lastc = '\0';
                    proceed && c != EOF;
                    lastc = c, c = fgetc(fp_inittab)) {
                        /* If we're not in the FAILURE state and haven't */
                        /* yet reached the shell command field, process  */
                        /* the line, otherwise just look for a real end  */
                        /* of line.                                      */
                        if (state != FAILURE && state != COMMAND) {
                        /*
                         * Squeeze out spaces and tabs.
                         */
                        if (c == ' ' || c == '\t')
                                continue;

                        /*
                         * Ignore characters in a comment, except for the \n.
                         */
                        if (state == COMMENT) {
                                if (c == '\n') {
                                        lastc = ' ';
                                        break;
                                } else {
                                        continue;
                                }
                        }

                        /*
                         * Detect comments (lines whose first non-whitespace
                         * character is '#') by checking that we're at the
                         * beginning of a line, have seen a '#', and haven't
                         * yet accumulated any characters.
                         */
                        if (state == ID && c == '#' && ptr == shcmd) {
                                state = COMMENT;
                                continue;
                        }

                        /*
                         * If the character is a ':', then check the
                         * previous field for correctness and advance
                         * to the next field.
                         */
                        if (c == ':') {
                                switch (state) {

                                case ID :
                                /*
                                 * Check to see that there are only
                                 * 1 to 4 characters for the id.
                                 */
                                if ((i = ptr - shcmd) < 1 || i > 4) {
                                        state = FAILURE;
                                } else {
                                        bcopy(shcmd, &cmd->c_id[0], i);
                                        ptr = shcmd;
                                        state = LEVELS;
                                }
                                break;

                                case LEVELS :
                                /*
                                 * Build a mask for all the levels for
                                 * which this command will be legal.
                                 */
                                for (cmd->c_levels = 0, ptr1 = shcmd;
                                    ptr1 < ptr; ptr1++) {
                                        int mask;
                                        if (lvlname_to_mask(*ptr1,
                                            &mask) == -1) {
                                                state = FAILURE;
                                                break;
                                        }
                                        cmd->c_levels |= mask;
                                }
                                if (state != FAILURE) {
                                        state = ACTION;
                                        ptr = shcmd;    /* Reset the buffer */
                                }
                                break;

                                case ACTION :
                                /*
                                 * Null terminate the string in shcmd buffer and
                                 * then try to match against legal actions.  If
                                 * the field is of length 0, then the default of
                                 * "RESPAWN" is used if the id is numeric,
                                 * otherwise the default is "OFF".
                                 */
                                if (ptr == shcmd) {
                                        if (isdigit(cmd->c_id[0]) &&
                                            (cmd->c_id[1] == '\0' ||
                                            isdigit(cmd->c_id[1])) &&
                                            (cmd->c_id[2] == '\0' ||
                                            isdigit(cmd->c_id[2])) &&
                                            (cmd->c_id[3] == '\0' ||
                                            isdigit(cmd->c_id[3])))
                                                cmd->c_action = M_RESPAWN;
                                        else
                                                cmd->c_action = M_OFF;
                                } else {
                                        for (cmd->c_action = 0, i = 0,
                                            *ptr = '\0';
                                            i <
                                            sizeof (actions)/sizeof (char *);
                                            i++) {
                                        if (strcmp(shcmd, actions[i]) == 0) {
                                                if ((cmd->c_levels & MASKSU) &&
                                                    !(act_masks[i] & su_acts))
                                                        cmd->c_action = 0;
                                                else
                                                        cmd->c_action =
                                                            act_masks[i];
                                                break;
                                        }
                                        }
                                }

                                /*
                                 * If the action didn't match any legal action,
                                 * set state to FAILURE.
                                 */
                                if (cmd->c_action == 0) {
                                        state = FAILURE;
                                } else {
                                        state = COMMAND;
                                        (void) strcpy(shcmd, "exec ");
                                }
                                ptr = shcmd + EXEC;
                                break;
                                }
                                continue;
                        }
                }

                /* If the character is a '\n', then this is the end of a */
                /* line.  If the '\n' wasn't preceded by a backslash, */
                /* it is also the end of an inittab command.  If it was */
                /* preceded by a backslash then the next line is a */
                /* continuation.  Note that the continuation '\n' falls */
                /* through and is treated like other characters and is */
                /* stored in the shell command line. */
                if (c == '\n' && lastc != '\\') {
                        proceed = FALSE;
                        *ptr = '\0';
                        break;
                }

                /* For all other characters just stuff them into the */
                /* command as long as there aren't too many of them. */
                /* Make sure there is room for a terminating '\0' also. */
                if (ptr >= shcmd + MAXCMDL - 1)
                        state = FAILURE;
                else
                        *ptr++ = (char)c;

                /* If the character we just stored was a quoted */
                /* backslash, then change "c" to '\0', so that this     */
                /* backslash will not cause a subsequent '\n' to appear */
                /* quoted.  In otherwords '\' '\' '\n' is the real end */
                /* of a command, while '\' '\n' is a continuation. */
                if (c == '\\' && lastc == '\\')
                        c = '\0';
                }

                /*
                 * Make sure all the fields are properly specified
                 * for a good command line.
                 */
                if (state == COMMAND) {
                        answer = TRUE;
                        cmd->c_command = shcmd;

                        /*
                         * If no default level was supplied, insert
                         * all numerical levels.
                         */
                        if (cmd->c_levels == 0)
                                cmd->c_levels = MASK_NUMERIC;

                        /*
                         * If no action has been supplied, declare this
                         * entry to be OFF.
                         */
                        if (cmd->c_action == 0)
                                cmd->c_action = M_OFF;

                        /*
                         * If no shell command has been supplied, make sure
                         * there is a null string in the command field.
                         */
                        if (ptr == shcmd + EXEC)
                                *shcmd = '\0';
                } else
                        answer = FALSE;

                /*
                 * If we have reached the end of inittab, then close it
                 * and quit trying to find a good command line.
                 */
                if (c == EOF) {
                        (void) fclose(fp_inittab);
                        fp_inittab = NULL;
                        break;
                }
        }
        return (answer);
}

/*
 * lvlname_to_state(): convert the character name of a state to its level
 * (its corresponding signal number).
 */
static int
lvlname_to_state(char name)
{
        int i;
        for (i = 0; i < LVL_NELEMS; i++) {
                if (lvls[i].lvl_name == name)
                        return (lvls[i].lvl_state);
        }
        return (-1);
}

/*
 * state_to_name(): convert the level to the character name.
 */
static char
state_to_name(int state)
{
        int i;
        for (i = 0; i < LVL_NELEMS; i++) {
                if (lvls[i].lvl_state == state)
                        return (lvls[i].lvl_name);
        }
        return (-1);
}

/*
 * state_to_mask(): return the mask corresponding to a signal number
 */
static int
state_to_mask(int state)
{
        int i;
        for (i = 0; i < LVL_NELEMS; i++) {
                if (lvls[i].lvl_state == state)
                        return (lvls[i].lvl_mask);
        }
        return (0);     /* return 0, since that represents an empty mask */
}

/*
 * lvlname_to_mask(): return the mask corresponding to a levels character name
 */
static int
lvlname_to_mask(char name, int *mask)
{
        int i;
        for (i = 0; i < LVL_NELEMS; i++) {
                if (lvls[i].lvl_name == name) {
                        *mask = lvls[i].lvl_mask;
                        return (0);
                }
        }
        return (-1);
}

/*
 * state_to_flags(): return the flags corresponding to a runlevel.  These
 * indicate properties of that runlevel.
 */
static int
state_to_flags(int state)
{
        int i;
        for (i = 0; i < LVL_NELEMS; i++) {
                if (lvls[i].lvl_state == state)
                        return (lvls[i].lvl_flags);
        }
        return (0);
}

/*
 * killproc() creates a child which kills the process specified by pid.
 */
void
killproc(pid_t pid)
{
        struct PROC_TABLE       *process;

        (void) sighold(SIGCLD);
        while ((process = efork(M_OFF, NULLPROC, 0)) == NO_ROOM)
                (void) pause();
        (void) sigrelse(SIGCLD);

        if (process == NULLPROC) {
                /*
                 * efork() sets all signal handlers to the default, so reset
                 * the ALRM handler to make timer() work as expected.
                 */
                (void) sigset(SIGALRM, alarmclk);

                /*
                 * We are the child.  Try to terminate the process nicely
                 * first using SIGTERM and if it refuses to die in TWARN
                 * seconds kill it with SIGKILL.
                 */
                (void) kill(pid, SIGTERM);
                (void) timer(TWARN);
                (void) kill(pid, SIGKILL);
                (void) exit(0);
        }
}

/*
 * Set up the default environment for all procs to be forked from init.
 * Read the values from the /etc/default/init file, except for PATH.  If
 * there's not enough room in the environment array, the environment
 * lines that don't fit are silently discarded.
 */
void
init_env()
{
        char    line[MAXCMDL];
        FILE    *fp;
        int     inquotes, length, wslength;
        char    *tokp, *cp1, *cp2;

        glob_envp[0] = malloc((unsigned)(strlen(DEF_PATH)+2));
        (void) strcpy(glob_envp[0], DEF_PATH);
        glob_envn = 1;

        if (rflg) {
                glob_envp[1] =
                    malloc((unsigned)(strlen("_DVFS_RECONFIG=YES")+2));
                (void) strcpy(glob_envp[1], "_DVFS_RECONFIG=YES");
                ++glob_envn;
        } else if (bflg == 1) {
                glob_envp[1] =
                    malloc((unsigned)(strlen("RB_NOBOOTRC=YES")+2));
                (void) strcpy(glob_envp[1], "RB_NOBOOTRC=YES");
                ++glob_envn;
        }

        if ((fp = fopen(ENVFILE, "r")) == NULL) {
                console(B_TRUE,
                    "Cannot open %s. Environment not initialized.\n",
                    ENVFILE);
        } else {
                while (fgets(line, MAXCMDL - 1, fp) != NULL &&
                    glob_envn < MAXENVENT - 2) {
                        /*
                         * Toss newline
                         */
                        length = strlen(line);
                        if (line[length - 1] == '\n')
                                line[length - 1] = '\0';

                        /*
                         * Ignore blank or comment lines.
                         */
                        if (line[0] == '#' || line[0] == '\0' ||
                            (wslength = strspn(line, " \t\n")) ==
                            strlen(line) ||
                            strchr(line, '#') == line + wslength)
                                continue;

                        /*
                         * First make a pass through the line and change
                         * any non-quoted semi-colons to blanks so they
                         * will be treated as token separators below.
                         */
                        inquotes = 0;
                        for (cp1 = line; *cp1 != '\0'; cp1++) {
                                if (*cp1 == '"') {
                                        if (inquotes == 0)
                                                inquotes = 1;
                                        else
                                                inquotes = 0;
                                } else if (*cp1 == ';') {
                                        if (inquotes == 0)
                                                *cp1 = ' ';
                                }
                        }

                        /*
                         * Tokens within the line are separated by blanks
                         *  and tabs.  For each token in the line which
                         * contains a '=' we strip out any quotes and then
                         * stick the token in the environment array.
                         */
                        if ((tokp = strtok(line, " \t")) == NULL)
                                continue;
                        do {
                                if (strchr(tokp, '=') == NULL)
                                        continue;
                                length = strlen(tokp);
                                while ((cp1 = strpbrk(tokp, "\"\'")) != NULL) {
                                        for (cp2 = cp1;
                                            cp2 < &tokp[length]; cp2++)
                                                *cp2 = *(cp2 + 1);
                                        length--;
                                }

                                if (strncmp(tokp, "CMASK=",
                                    sizeof ("CMASK=") - 1) == 0) {
                                        long t;

                                        /* We know there's an = */
                                        t = strtol(strchr(tokp, '=') + 1, NULL,
                                            8);

                                        /* Sanity */
                                        if (t <= 077 && t >= 0)
                                                cmask = (int)t;
                                        (void) umask(cmask);
                                        continue;
                                }
                                glob_envp[glob_envn] =
                                    malloc((unsigned)(length + 1));
                                (void) strcpy(glob_envp[glob_envn], tokp);
                                if (++glob_envn >= MAXENVENT - 1)
                                        break;
                        } while ((tokp = strtok(NULL, " \t")) != NULL);
                }

                /*
                 * Append a null pointer to the environment array
                 * to mark its end.
                 */
                glob_envp[glob_envn] = NULL;
                (void) fclose(fp);
        }
}

/*
 * boot_init(): Do initialization things that should be done at boot.
 */
void
boot_init()
{
        int i;
        struct PROC_TABLE *process, *oprocess;
        struct CMD_LINE cmd;
        char    line[MAXCMDL];
        char    svc_aux[SVC_AUX_SIZE];
        char    init_svc_fmri[SVC_FMRI_SIZE];
        char *old_path;
        int maxfiles;

        /* Use INIT_PATH for sysinit cmds */
        old_path = glob_envp[0];
        glob_envp[0] = malloc((unsigned)(strlen(INIT_PATH)+2));
        (void) strcpy(glob_envp[0], INIT_PATH);

        /*
         * Scan inittab(4) and process the special svc.startd entry, initdefault
         * and sysinit entries.
         */
        while (getcmd(&cmd, &line[0]) == TRUE) {
                if (startd_tmpl >= 0 && id_eq(cmd.c_id, "smf")) {
                        process_startd_line(&cmd, line);
                        (void) snprintf(startd_svc_aux, SVC_AUX_SIZE,
                            INITTAB_ENTRY_ID_STR_FORMAT, cmd.c_id);
                } else if (cmd.c_action == M_INITDEFAULT) {
                        /*
                         * initdefault is no longer meaningful, as the SMF
                         * milestone controls what (legacy) run level we
                         * boot to.
                         */
                        console(B_TRUE,
                            "Ignoring legacy \"initdefault\" entry.\n");
                } else if (cmd.c_action == M_SYSINIT) {
                        /*
                         * Execute the "sysinit" entry and wait for it to
                         * complete.  No bookkeeping is performed on these
                         * entries because we avoid writing to the file system
                         * until after there has been an chance to check it.
                         */
                        if (process = findpslot(&cmd)) {
                                (void) sighold(SIGCLD);
                                (void) snprintf(svc_aux, SVC_AUX_SIZE,
                                    INITTAB_ENTRY_ID_STR_FORMAT, cmd.c_id);
                                (void) snprintf(init_svc_fmri, SVC_FMRI_SIZE,
                                    SVC_INIT_PREFIX INITTAB_ENTRY_ID_STR_FORMAT,
                                    cmd.c_id);
                                if (legacy_tmpl >= 0) {
                                        (void) ct_pr_tmpl_set_svc_fmri(
                                            legacy_tmpl, init_svc_fmri);
                                        (void) ct_pr_tmpl_set_svc_aux(
                                            legacy_tmpl, svc_aux);
                                }

                                for (oprocess = process;
                                    (process = efork(M_OFF, oprocess,
                                    (NAMED|NOCLEANUP))) == NO_ROOM;
                                    /* CSTYLED */)
                                        ;
                                (void) sigrelse(SIGCLD);

                                if (process == NULLPROC) {
                                        maxfiles = ulimit(UL_GDESLIM, 0);

                                        for (i = 0; i < maxfiles; i++)
                                                (void) fcntl(i, F_SETFD,
                                                    FD_CLOEXEC);
                                        (void) execle(SH, "INITSH", "-c",
                                            cmd.c_command,
                                            (char *)0, glob_envp);
                                        console(B_TRUE,
"Command\n\"%s\"\n failed to execute.  errno = %d (exec of shell failed)\n",
                                            cmd.c_command, errno);
                                        exit(1);
                                } else
                                        while (waitproc(process) == FAILURE)
                                                ;
                                process->p_flags = 0;
                                st_write();
                        }
                }
        }

        /* Restore the path. */
        free(glob_envp[0]);
        glob_envp[0] = old_path;

        /*
         * This will enable st_write() to complain about init_state_file.
         */
        booting = 0;

        /*
         * If the /etc/ioctl.syscon didn't exist or had invalid contents write
         * out a correct version.
         */
        if (write_ioctl)
                write_ioctl_syscon();

        /*
         * Start svc.startd(1M), which does most of the work.
         */
        if (startd_cline[0] != '\0' && startd_tmpl >= 0) {
                /* Start svc.startd. */
                if (startd_run(startd_cline, startd_tmpl, 0) == -1)
                        cur_state = SINGLE_USER;
        } else {
                console(B_TRUE, "Absent svc.startd entry or bad "
                    "contract template.  Not starting svc.startd.\n");
                enter_maintenance();
        }
}

/*
 * init_signals(): Initialize all signals to either be caught or ignored.
 */
void
init_signals(void)
{
        struct sigaction act;
        int i;

        /*
         * Start by ignoring all signals, then selectively re-enable some.
         * The SIG_IGN disposition will only affect asynchronous signals:
         * any signal that we trigger synchronously that doesn't end up
         * being handled by siglvl() will be forcibly delivered by the kernel.
         */
        for (i = SIGHUP; i <= SIGRTMAX; i++)
                (void) sigset(i, SIG_IGN);

        /*
         * Handle all level-changing signals using siglvl() and set sa_mask so
         * that all level-changing signals are blocked while in siglvl().
         */
        act.sa_handler = siglvl;
        act.sa_flags = SA_SIGINFO;
        (void) sigemptyset(&act.sa_mask);

        (void) sigaddset(&act.sa_mask, LVLQ);
        (void) sigaddset(&act.sa_mask, LVL0);
        (void) sigaddset(&act.sa_mask, LVL1);
        (void) sigaddset(&act.sa_mask, LVL2);
        (void) sigaddset(&act.sa_mask, LVL3);
        (void) sigaddset(&act.sa_mask, LVL4);
        (void) sigaddset(&act.sa_mask, LVL5);
        (void) sigaddset(&act.sa_mask, LVL6);
        (void) sigaddset(&act.sa_mask, SINGLE_USER);
        (void) sigaddset(&act.sa_mask, LVLa);
        (void) sigaddset(&act.sa_mask, LVLb);
        (void) sigaddset(&act.sa_mask, LVLc);

        (void) sigaction(LVLQ, &act, NULL);
        (void) sigaction(LVL0, &act, NULL);
        (void) sigaction(LVL1, &act, NULL);
        (void) sigaction(LVL2, &act, NULL);
        (void) sigaction(LVL3, &act, NULL);
        (void) sigaction(LVL4, &act, NULL);
        (void) sigaction(LVL5, &act, NULL);
        (void) sigaction(LVL6, &act, NULL);
        (void) sigaction(SINGLE_USER, &act, NULL);
        (void) sigaction(LVLa, &act, NULL);
        (void) sigaction(LVLb, &act, NULL);
        (void) sigaction(LVLc, &act, NULL);

        (void) sigset(SIGALRM, alarmclk);
        alarmclk();

        (void) sigset(SIGCLD, childeath);
        (void) sigset(SIGPWR, powerfail);
}

/*
 * Set up pipe for "godchildren". If the file exists and is a pipe just open
 * it. Else, if the file system is r/w create it.  Otherwise, defer its
 * creation and open until after /var/run has been mounted.  This function is
 * only called on startup and when explicitly requested via LVLQ.
 */
void
setup_pipe()
{
        struct stat stat_buf;
        struct statvfs statvfs_buf;
        struct sigaction act;

        /*
         * Always close the previous pipe descriptor as the mounted filesystems
         * may have changed.
         */
        if (Pfd >= 0)
                (void) close(Pfd);

        if ((stat(INITPIPE, &stat_buf) == 0) &&
            ((stat_buf.st_mode & (S_IFMT|S_IRUSR)) == (S_IFIFO|S_IRUSR)))
                Pfd = open(INITPIPE, O_RDWR | O_NDELAY);
        else
                if ((statvfs(INITPIPE_DIR, &statvfs_buf) == 0) &&
                    ((statvfs_buf.f_flag & ST_RDONLY) == 0)) {
                        (void) unlink(INITPIPE);
                        (void) mknod(INITPIPE, S_IFIFO | 0600, 0);
                        Pfd = open(INITPIPE, O_RDWR | O_NDELAY);
                }

        if (Pfd >= 0) {
                (void) ioctl(Pfd, I_SETSIG, S_INPUT);
                /*
                 * Read pipe in message discard mode.
                 */
                (void) ioctl(Pfd, I_SRDOPT, RMSGD);

                act.sa_handler = sigpoll;
                act.sa_flags = 0;
                (void) sigemptyset(&act.sa_mask);
                (void) sigaddset(&act.sa_mask, SIGCLD);
                (void) sigaction(SIGPOLL, &act, NULL);
        }
}

/*
 * siglvl - handle an asynchronous signal from init(1M) telling us that we
 * should change the current run level.  We set new_state accordingly.
 */
void
siglvl(int sig, siginfo_t *sip, ucontext_t *ucp)
{
        struct PROC_TABLE *process;
        struct sigaction act;

        /*
         * If the signal was from the kernel (rather than init(1M)) then init
         * itself tripped the signal.  That is, we might have a bug and tripped
         * a real SIGSEGV instead of receiving it as an alias for SIGLVLa.  In
         * such a case we reset the disposition to SIG_DFL, block all signals
         * in uc_mask but the current one, and return to the interrupted ucp
         * to effect an appropriate death.  The kernel will then restart us.
         *
         * The one exception to SI_FROMKERNEL() is SIGFPE (a.k.a. LVL6), which
         * the kernel can send us when it wants to effect an orderly reboot.
         * For this case we must also verify si_code is zero, rather than a
         * code such as FPE_INTDIV which a bug might have triggered.
         */
        if (sip != NULL && SI_FROMKERNEL(sip) &&
            (sig != SIGFPE || sip->si_code == 0)) {

                (void) sigemptyset(&act.sa_mask);
                act.sa_handler = SIG_DFL;
                act.sa_flags = 0;
                (void) sigaction(sig, &act, NULL);

                (void) sigfillset(&ucp->uc_sigmask);
                (void) sigdelset(&ucp->uc_sigmask, sig);
                ucp->uc_flags |= UC_SIGMASK;

                (void) setcontext(ucp);
        }

        /*
         * If the signal received is a LVLQ signal, do not really
         * change levels, just restate the current level.  If the
         * signal is not a LVLQ, set the new level to the signal
         * received.
         */
        if (sig == LVLQ) {
                new_state = cur_state;
                lvlq_received = B_TRUE;
        } else {
                new_state = sig;
        }

        /*
         * Clear all times and repeat counts in the process table
         * since either the level is changing or the user has editted
         * the inittab file and wants us to look at it again.
         * If the user has fixed a typo, we don't want residual timing
         * data preventing the fixed command line from executing.
         */
        for (process = proc_table;
            (process < proc_table + num_proc); process++) {
                process->p_time = 0L;
                process->p_count = 0;
        }

        /*
         * Set the flag to indicate that a "user signal" was received.
         */
        wakeup.w_flags.w_usersignal = 1;
}


/*
 * alarmclk
 */
static void
alarmclk()
{
        time_up = TRUE;
}

/*
 * childeath_single():
 *
 * This used to be the SIGCLD handler and it was set with signal()
 * (as opposed to sigset()).  When a child exited we'd come to the
 * handler, wait for the child, and reenable the handler with
 * signal() just before returning.  The implementation of signal()
 * checks with waitid() for waitable children and sends a SIGCLD
 * if there are some.  If children are exiting faster than the
 * handler can run we keep sending signals and the handler never
 * gets to return and eventually the stack runs out and init dies.
 * To prevent that we set the handler with sigset() so the handler
 * doesn't need to be reset, and in childeath() (see below) we
 * call childeath_single() as long as there are children to be
 * waited for.  If a child exits while init is in the handler a
 * SIGCLD will be pending and delivered on return from the handler.
 * If the child was already waited for the handler will have nothing
 * to do and return, otherwise the child will be waited for.
 */
static void
childeath_single(pid_t pid, int status)
{
        struct PROC_TABLE       *process;
        struct pidlist          *pp;

        /*
         * Scan the process table to see if we are interested in this process.
         */
        for (process = proc_table;
            (process < proc_table + num_proc); process++) {
                if ((process->p_flags & (LIVING|OCCUPIED)) ==
                    (LIVING|OCCUPIED) && process->p_pid == pid) {

                        /*
                         * Mark this process as having died and store the exit
                         * status.  Also set the wakeup flag for a dead child
                         * and break out of the loop.
                         */
                        process->p_flags &= ~LIVING;
                        process->p_exit = (short)status;
                        wakeup.w_flags.w_childdeath = 1;

                        return;
                }
        }

        /*
         * No process was found above, look through auxiliary list.
         */
        (void) sighold(SIGPOLL);
        pp = Plhead;
        while (pp) {
                if (pid > pp->pl_pid) {
                        /*
                         * Keep on looking.
                         */
                        pp = pp->pl_next;
                        continue;
                } else if (pid < pp->pl_pid) {
                        /*
                         * Not in the list.
                         */
                        break;
                } else {
                        /*
                         * This is a dead "godchild".
                         */
                        pp->pl_dflag = 1;
                        pp->pl_exit = (short)status;
                        wakeup.w_flags.w_childdeath = 1;
                        Gchild = 1;     /* Notice to call cleanaux(). */
                        break;
                }
        }

        (void) sigrelse(SIGPOLL);
}

/* ARGSUSED */
static void
childeath(int signo)
{
        pid_t pid;
        int status;

        while ((pid = waitpid(-1, &status, WNOHANG)) > 0)
                childeath_single(pid, status);
}

static void
powerfail()
{
        (void) nice(-19);
        wakeup.w_flags.w_powerhit = 1;
}

/*
 * efork() forks a child and the parent inserts the process in its table
 * of processes that are directly a result of forks that it has performed.
 * The child just changes the "global" with the process id for this process
 * to it's new value.
 * If efork() is called with a pointer into the proc_table it uses that slot,
 * otherwise it searches for a free slot.  Regardless of how it was called,
 * it returns the pointer to the proc_table entry
 *
 * The SIGCLD signal is blocked (held) before calling efork()
 * and is unblocked (released) after efork() returns.
 *
 * Ideally, this should be rewritten to use modern signal semantics.
 */
static struct PROC_TABLE *
efork(int action, struct PROC_TABLE *process, int modes)
{
        pid_t   childpid;
        struct PROC_TABLE *proc;
        int             i;
        /*
         * Freshen up the proc_table, removing any entries for dead processes
         * that don't have NOCLEANUP set.  Perform the necessary accounting.
         */
        for (proc = proc_table; (proc < proc_table + num_proc); proc++) {
                if ((proc->p_flags & (OCCUPIED|LIVING|NOCLEANUP)) ==
                    (OCCUPIED)) {
                        /*
                         * Is this a named process?
                         * If so, do the necessary bookkeeping.
                         */
                        if (proc->p_flags & NAMED)
                                (void) account(DEAD_PROCESS, proc, NULL);

                        /*
                         * Free this entry for new usage.
                         */
                        proc->p_flags = 0;
                }
        }

        while ((childpid = fork()) == FAILURE) {
                /*
                 * Shorten the alarm timer in case someone else's child dies
                 * and free up a slot in the process table.
                 */
                setimer(5);

                /*
                 * Wait for some children to die.  Since efork()
                 * is always called with SIGCLD blocked, unblock
                 * it here so that child death signals can come in.
                 */
                (void) sigrelse(SIGCLD);
                (void) pause();
                (void) sighold(SIGCLD);
                setimer(0);
        }

        if (childpid != 0) {

                if (process == NULLPROC) {
                        /*
                         * No proc table pointer specified so search
                         * for a free slot.
                         */
                        for (process = proc_table;  process->p_flags != 0 &&
                            (process < proc_table + num_proc); process++)
                                        ;

                        if (process == (proc_table + num_proc)) {
                                int old_proc_table_size = num_proc;

                                /* Increase the process table size */
                                increase_proc_table_size();
                                if (old_proc_table_size == num_proc) {
                                        /* didn't grow: memory failure */
                                        return (NO_ROOM);
                                } else {
                                        process =
                                            proc_table + old_proc_table_size;
                                }
                        }

                        process->p_time = 0L;
                        process->p_count = 0;
                }
                process->p_id[0] = '\0';
                process->p_id[1] = '\0';
                process->p_id[2] = '\0';
                process->p_id[3] = '\0';
                process->p_pid = childpid;
                process->p_flags = (LIVING | OCCUPIED | modes);
                process->p_exit = 0;

                st_write();
        } else {
                if ((action & (M_WAIT | M_BOOTWAIT)) == 0)
                        (void) setpgrp();

                process = NULLPROC;

                /*
                 * Reset all signals to the system defaults.
                 */
                for (i = SIGHUP; i <= SIGRTMAX; i++)
                        (void) sigset(i, SIG_DFL);

                /*
                 * POSIX B.2.2.2 advises that init should set SIGTTOU,
                 * SIGTTIN, and SIGTSTP to SIG_IGN.
                 *
                 * Make sure that SIGXCPU and SIGXFSZ also remain ignored,
                 * for backward compatibility.
                 */
                (void) sigset(SIGTTIN, SIG_IGN);
                (void) sigset(SIGTTOU, SIG_IGN);
                (void) sigset(SIGTSTP, SIG_IGN);
                (void) sigset(SIGXCPU, SIG_IGN);
                (void) sigset(SIGXFSZ, SIG_IGN);
        }
        return (process);
}


/*
 * waitproc() waits for a specified process to die.  For this function to
 * work, the specified process must already in the proc_table.  waitproc()
 * returns the exit status of the specified process when it dies.
 */
static long
waitproc(struct PROC_TABLE *process)
{
        int             answer;
        sigset_t        oldmask, newmask, zeromask;

        (void) sigemptyset(&zeromask);
        (void) sigemptyset(&newmask);

        (void) sigaddset(&newmask, SIGCLD);

        /* Block SIGCLD and save the current signal mask */
        if (sigprocmask(SIG_BLOCK, &newmask, &oldmask) < 0)
                perror("SIG_BLOCK error");

        /*
         * Wait around until the process dies.
         */
        if (process->p_flags & LIVING)
                (void) sigsuspend(&zeromask);

        /* Reset signal mask to unblock SIGCLD */
        if (sigprocmask(SIG_SETMASK, &oldmask, NULL) < 0)
                perror("SIG_SETMASK error");

        if (process->p_flags & LIVING)
                return (FAILURE);

        /*
         * Make sure to only return 16 bits so that answer will always
         * be positive whenever the process of interest really died.
         */
        answer = (process->p_exit & 0xffff);

        /*
         * Free the slot in the proc_table.
         */
        process->p_flags = 0;
        return (answer);
}

/*
 * notify_pam_dead(): calls into the PAM framework to close the given session.
 */
static void
notify_pam_dead(struct utmpx *up)
{
        pam_handle_t *pamh;
        char user[sizeof (up->ut_user) + 1];
        char ttyn[sizeof (up->ut_line) + 1];
        char host[sizeof (up->ut_host) + 1];

        /*
         * PAM does not take care of updating utmpx/wtmpx.
         */
        (void) snprintf(user, sizeof (user), "%s", up->ut_user);
        (void) snprintf(ttyn, sizeof (ttyn), "%s", up->ut_line);
        (void) snprintf(host, sizeof (host), "%s", up->ut_host);

        if (pam_start("init", user, NULL, &pamh) == PAM_SUCCESS)  {
                (void) pam_set_item(pamh, PAM_TTY, ttyn);
                (void) pam_set_item(pamh, PAM_RHOST, host);
                (void) pam_close_session(pamh, 0);
                (void) pam_end(pamh, PAM_SUCCESS);
        }
}

/*
 * Check you can access utmpx (As / may be read-only and
 * /var may not be mounted yet).
 */
static int
access_utmpx(void)
{
        do {
                utmpx_ok = (access(UTMPX, R_OK|W_OK) == 0);
        } while (!utmpx_ok && errno == EINTR);

        return (utmpx_ok);
}

/*
 * account() updates entries in utmpx and appends new entries to the end of
 * wtmpx (assuming they exist).  The program argument indicates the name of
 * program if INIT_PROCESS, otherwise should be NULL.
 *
 * account() only blocks for INIT_PROCESS requests.
 *
 * Returns non-zero if write failed.
 */
static int
account(short state, struct PROC_TABLE *process, char *program)
{
        struct utmpx utmpbuf, *u, *oldu;
        int tmplen;
        char fail_buf[UT_LINE_SZ];
        sigset_t block, unblock;

        if (!utmpx_ok && !access_utmpx()) {
                return (-1);
        }

        /*
         * Set up the prototype for the utmp structure we want to write.
         */
        u = &utmpbuf;
        (void) memset(u, 0, sizeof (struct utmpx));

        /*
         * Fill in the various fields of the utmp structure.
         */
        u->ut_id[0] = process->p_id[0];
        u->ut_id[1] = process->p_id[1];
        u->ut_id[2] = process->p_id[2];
        u->ut_id[3] = process->p_id[3];
        u->ut_pid = process->p_pid;

        /*
         * Fill the "ut_exit" structure.
         */
        u->ut_exit.e_termination = WTERMSIG(process->p_exit);
        u->ut_exit.e_exit = WEXITSTATUS(process->p_exit);
        u->ut_type = state;

        (void) time(&u->ut_tv.tv_sec);

        /*
         * Block signals for utmp update.
         */
        (void) sigfillset(&block);
        (void) sigprocmask(SIG_BLOCK, &block, &unblock);

        /*
         * See if there already is such an entry in the "utmpx" file.
         */
        setutxent();    /* Start at beginning of utmpx file. */

        if ((oldu = getutxid(u)) != NULL) {
                /*
                 * Copy in the old "user", "line" and "host" fields
                 * to our new structure.
                 */
                bcopy(oldu->ut_user, u->ut_user, sizeof (u->ut_user));
                bcopy(oldu->ut_line, u->ut_line, sizeof (u->ut_line));
                bcopy(oldu->ut_host, u->ut_host, sizeof (u->ut_host));
                u->ut_syslen = (tmplen = strlen(u->ut_host)) ?
                    min(tmplen + 1, sizeof (u->ut_host)) : 0;

                if (oldu->ut_type == USER_PROCESS && state == DEAD_PROCESS) {
                        notify_pam_dead(oldu);
                }
        }

        /*
         * Perform special accounting. Insert the special string into the
         * ut_line array. For INIT_PROCESSes put in the name of the
         * program in the "ut_user" field.
         */
        switch (state) {
        case INIT_PROCESS:
                (void) strncpy(u->ut_user, program, sizeof (u->ut_user));
                (void) strcpy(fail_buf, "INIT_PROCESS");
                break;

        default:
                (void) strlcpy(fail_buf, u->ut_id, sizeof (u->ut_id) + 1);
                break;
        }

        /*
         * Write out the updated entry to utmpx file.
         */
        if (pututxline(u) == NULL) {
                console(B_TRUE, "Failed write of utmpx entry: \"%s\": %s\n",
                    fail_buf, strerror(errno));
                endutxent();
                (void) sigprocmask(SIG_SETMASK, &unblock, NULL);
                return (-1);
        }

        /*
         * If we're able to write to utmpx, then attempt to add to the
         * end of the wtmpx file.
         */
        updwtmpx(WTMPX, u);

        endutxent();

        (void) sigprocmask(SIG_SETMASK, &unblock, NULL);

        return (0);
}

static void
clearent(pid_t pid, short status)
{
        struct utmpx *up;
        sigset_t block, unblock;

        /*
         * Block signals for utmp update.
         */
        (void) sigfillset(&block);
        (void) sigprocmask(SIG_BLOCK, &block, &unblock);

        /*
         * No error checking for now.
         */

        setutxent();
        while (up = getutxent()) {
                if (up->ut_pid == pid) {
                        if (up->ut_type == DEAD_PROCESS) {
                                /*
                                 * Cleaned up elsewhere.
                                 */
                                continue;
                        }

                        notify_pam_dead(up);

                        up->ut_type = DEAD_PROCESS;
                        up->ut_exit.e_termination = WTERMSIG(status);
                        up->ut_exit.e_exit = WEXITSTATUS(status);
                        (void) time(&up->ut_tv.tv_sec);

                        (void) pututxline(up);
                        /*
                         * Now attempt to add to the end of the
                         * wtmp and wtmpx files.  Do not create
                         * if they don't already exist.
                         */
                        updwtmpx(WTMPX, up);

                        break;
                }
        }

        endutxent();
        (void) sigprocmask(SIG_SETMASK, &unblock, NULL);
}

/*
 * prog_name() searches for the word or unix path name and
 * returns a pointer to the last element of the pathname.
 */
static char *
prog_name(char *string)
{
        char    *ptr, *ptr2;
        static char word[UT_USER_SZ + 1];

        /*
         * Search for the first word skipping leading spaces and tabs.
         */
        while (*string == ' ' || *string == '\t')
                string++;

        /*
         * If the first non-space non-tab character is not one allowed in
         * a word, return a pointer to a null string, otherwise parse the
         * pathname.
         */
        if (*string != '.' && *string != '/' && *string != '_' &&
            (*string < 'a' || *string > 'z') &&
            (*string < 'A' || * string > 'Z') &&
            (*string < '0' || *string > '9'))
                return ("");

        /*
         * Parse the pathname looking forward for '/', ' ', '\t', '\n' or
         * '\0'.  Each time a '/' is found, move "ptr" to one past the
         * '/', thus when a ' ', '\t', '\n', or '\0' is found, "ptr" will
         * point to the last element of the pathname.
         */
        for (ptr = string; *string != ' ' && *string != '\t' &&
            *string != '\n' && *string != '\0'; string++) {
                if (*string == '/')
                        ptr = string+1;
        }

        /*
         * Copy out up to the size of the "ut_user" array into "word",
         * null terminate it and return a pointer to it.
         */
        for (ptr2 = &word[0]; ptr2 < &word[UT_USER_SZ] &&
            ptr < string; /* CSTYLED */)
                *ptr2++ = *ptr++;

        *ptr2 = '\0';
        return (&word[0]);
}


/*
 * realcon() returns a nonzero value if there is a character device
 * associated with SYSCON that has the same device number as CONSOLE.
 */
static int
realcon()
{
        struct stat sconbuf, conbuf;

        if (stat(SYSCON, &sconbuf) != -1 &&
            stat(CONSOLE, &conbuf) != -1 &&
            S_ISCHR(sconbuf.st_mode) &&
            S_ISCHR(conbuf.st_mode) &&
            sconbuf.st_rdev == conbuf.st_rdev) {
                return (1);
        } else {
                return (0);
        }
}


/*
 * get_ioctl_syscon() retrieves the SYSCON settings from the IOCTLSYSCON file.
 * Returns true if the IOCTLSYSCON file needs to be written (with
 * write_ioctl_syscon() below)
 */
static int
get_ioctl_syscon()
{
        FILE    *fp;
        unsigned int    iflags, oflags, cflags, lflags, ldisc, cc[18];
        int             i, valid_format = 0;

        /*
         * Read in the previous modes for SYSCON from IOCTLSYSCON.
         */
        if ((fp = fopen(IOCTLSYSCON, "r")) == NULL) {
                stored_syscon_termios = dflt_termios;
                console(B_TRUE,
                    "warning:%s does not exist, default settings assumed\n",
                    IOCTLSYSCON);
        } else {

                i = fscanf(fp,
            "%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x",
                    &iflags, &oflags, &cflags, &lflags,
                    &cc[0], &cc[1], &cc[2], &cc[3], &cc[4], &cc[5], &cc[6],
                    &cc[7], &cc[8], &cc[9], &cc[10], &cc[11], &cc[12], &cc[13],
                    &cc[14], &cc[15], &cc[16], &cc[17]);

                if (i == 22) {
                        stored_syscon_termios.c_iflag = iflags;
                        stored_syscon_termios.c_oflag = oflags;
                        stored_syscon_termios.c_cflag = cflags;
                        stored_syscon_termios.c_lflag = lflags;
                        for (i = 0; i < 18; i++)
                                stored_syscon_termios.c_cc[i] = (char)cc[i];
                        valid_format = 1;
                } else if (i == 13) {
                rewind(fp);
                i = fscanf(fp, "%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x:%x",
                    &iflags, &oflags, &cflags, &lflags, &ldisc, &cc[0], &cc[1],
                    &cc[2], &cc[3], &cc[4], &cc[5], &cc[6], &cc[7]);

                /*
                 * If the file is formatted properly, use the values to
                 * initialize the console terminal condition.
                 */
                stored_syscon_termios.c_iflag = (ushort_t)iflags;
                stored_syscon_termios.c_oflag = (ushort_t)oflags;
                stored_syscon_termios.c_cflag = (ushort_t)cflags;
                stored_syscon_termios.c_lflag = (ushort_t)lflags;
                for (i = 0; i < 8; i++)
                        stored_syscon_termios.c_cc[i] = (char)cc[i];
                valid_format = 1;
                }
                (void) fclose(fp);

                /* If the file is badly formatted, use the default settings. */
                if (!valid_format)
                        stored_syscon_termios = dflt_termios;
        }

        /* If the file had a bad format, rewrite it later. */
        return (!valid_format);
}


static void
write_ioctl_syscon()
{
        FILE *fp;
        int i;

        (void) unlink(SYSCON);
        (void) link(SYSTTY, SYSCON);
        (void) umask(022);
        fp = fopen(IOCTLSYSCON, "w");

        (void) fprintf(fp, "%x:%x:%x:%x:0", stored_syscon_termios.c_iflag,
            stored_syscon_termios.c_oflag, stored_syscon_termios.c_cflag,
            stored_syscon_termios.c_lflag);
        for (i = 0; i < 8; ++i)
                (void) fprintf(fp, ":%x", stored_syscon_termios.c_cc[i]);
        (void) putc('\n', fp);

        (void) fflush(fp);
        (void) fsync(fileno(fp));
        (void) fclose(fp);
        (void) umask(cmask);
}


/*
 * void console(boolean_t, char *, ...)
 *   Outputs the requested message to the system console.  Note that the number
 *   of arguments passed to console() should be determined by the print format.
 *
 *   The "prefix" parameter indicates whether or not "INIT: " should precede the
 *   message.
 *
 *   To make sure we write to the console in a sane fashion, we use the modes
 *   we keep in stored_syscon_termios (which we read out of /etc/ioctl.syscon).
 *   Afterwards we restore whatever modes were already there.
 */
/* PRINTFLIKE2 */
static void
console(boolean_t prefix, char *format, ...)
{
        char    outbuf[BUFSIZ];
        va_list args;
        int fd, getret;
        struct termios old_syscon_termios;
        FILE *f;

        /*
         * We open SYSCON anew each time in case it has changed (see
         * userinit()).
         */
        if ((fd = open(SYSCON, O_RDWR | O_NOCTTY)) < 0 ||
            (f = fdopen(fd, "r+")) == NULL) {
                if (prefix)
                        syslog(LOG_WARNING, "INIT: ");
                va_start(args, format);
                vsyslog(LOG_WARNING, format, args);
                va_end(args);
                if (fd >= 0)
                        (void) close(fd);
                return;
        }
        setbuf(f, &outbuf[0]);

        getret = tcgetattr(fd, &old_syscon_termios);
        old_syscon_termios.c_cflag &= ~HUPCL;
        if (realcon())
                /* Don't overwrite cflag of real console. */
                stored_syscon_termios.c_cflag = old_syscon_termios.c_cflag;

        stored_syscon_termios.c_cflag &= ~HUPCL;

        (void) tcsetattr(fd, TCSANOW, &stored_syscon_termios);

        if (prefix)
                (void) fprintf(f, "\nINIT: ");
        va_start(args, format);
        (void) vfprintf(f, format, args);
        va_end(args);

        if (getret == 0)
                (void) tcsetattr(fd, TCSADRAIN, &old_syscon_termios);

        (void) fclose(f);
}

/*
 * timer() is a substitute for sleep() which uses alarm() and pause().
 */
static void
timer(int waitime)
{
        setimer(waitime);
        while (time_up == FALSE)
                (void) pause();
}

static void
setimer(int timelimit)
{
        alarmclk();
        (void) alarm(timelimit);
        time_up = (timelimit ? FALSE : TRUE);
}

/*
 * Fails with
 *   ENOMEM - out of memory
 *   ECONNABORTED - repository connection broken
 *   EPERM - permission denied
 *   EACCES - backend access denied
 *   EROFS - backend readonly
 */
static int
get_or_add_startd(scf_instance_t *inst)
{
        scf_handle_t *h;
        scf_scope_t *scope = NULL;
        scf_service_t *svc = NULL;
        int ret = 0;

        h = scf_instance_handle(inst);

        if (scf_handle_decode_fmri(h, SCF_SERVICE_STARTD, NULL, NULL, inst,
            NULL, NULL, SCF_DECODE_FMRI_EXACT) == 0)
                return (0);

        switch (scf_error()) {
        case SCF_ERROR_CONNECTION_BROKEN:
                return (ECONNABORTED);

        case SCF_ERROR_NOT_FOUND:
                break;

        case SCF_ERROR_HANDLE_MISMATCH:
        case SCF_ERROR_INVALID_ARGUMENT:
        case SCF_ERROR_CONSTRAINT_VIOLATED:
        default:
                bad_error("scf_handle_decode_fmri", scf_error());
        }

        /* Make sure we're right, since we're adding piece-by-piece. */
        assert(strcmp(SCF_SERVICE_STARTD,
            "svc:/system/svc/restarter:default") == 0);

        if ((scope = scf_scope_create(h)) == NULL ||
            (svc = scf_service_create(h)) == NULL) {
                ret = ENOMEM;
                goto out;
        }

get_scope:
        if (scf_handle_get_scope(h, SCF_SCOPE_LOCAL, scope) != 0) {
                switch (scf_error()) {
                case SCF_ERROR_CONNECTION_BROKEN:
                        ret = ECONNABORTED;
                        goto out;

                case SCF_ERROR_NOT_FOUND:
                        (void) fputs(gettext(
                            "smf(5) repository missing local scope.\n"),
                            stderr);
                        exit(1);
                        /* NOTREACHED */

                case SCF_ERROR_HANDLE_MISMATCH:
                case SCF_ERROR_INVALID_ARGUMENT:
                default:
                        bad_error("scf_handle_get_scope", scf_error());
                }
        }

get_svc:
        if (scf_scope_get_service(scope, "system/svc/restarter", svc) != 0) {
                switch (scf_error()) {
                case SCF_ERROR_CONNECTION_BROKEN:
                        ret = ECONNABORTED;
                        goto out;

                case SCF_ERROR_DELETED:
                        goto get_scope;

                case SCF_ERROR_NOT_FOUND:
                        break;

                case SCF_ERROR_HANDLE_MISMATCH:
                case SCF_ERROR_INVALID_ARGUMENT:
                case SCF_ERROR_NOT_SET:
                default:
                        bad_error("scf_scope_get_service", scf_error());
                }

add_svc:
                if (scf_scope_add_service(scope, "system/svc/restarter", svc) !=
                    0) {
                        switch (scf_error()) {
                        case SCF_ERROR_CONNECTION_BROKEN:
                                ret = ECONNABORTED;
                                goto out;

                        case SCF_ERROR_EXISTS:
                                goto get_svc;

                        case SCF_ERROR_PERMISSION_DENIED:
                                ret = EPERM;
                                goto out;

                        case SCF_ERROR_BACKEND_ACCESS:
                                ret = EACCES;
                                goto out;

                        case SCF_ERROR_BACKEND_READONLY:
                                ret = EROFS;
                                goto out;

                        case SCF_ERROR_HANDLE_MISMATCH:
                        case SCF_ERROR_INVALID_ARGUMENT:
                        case SCF_ERROR_NOT_SET:
                        default:
                                bad_error("scf_scope_add_service", scf_error());
                        }
                }
        }

get_inst:
        if (scf_service_get_instance(svc, "default", inst) != 0) {
                switch (scf_error()) {
                case SCF_ERROR_CONNECTION_BROKEN:
                        ret = ECONNABORTED;
                        goto out;

                case SCF_ERROR_DELETED:
                        goto add_svc;

                case SCF_ERROR_NOT_FOUND:
                        break;

                case SCF_ERROR_HANDLE_MISMATCH:
                case SCF_ERROR_INVALID_ARGUMENT:
                case SCF_ERROR_NOT_SET:
                default:
                        bad_error("scf_service_get_instance", scf_error());
                }

                if (scf_service_add_instance(svc, "default", inst) !=
                    0) {
                        switch (scf_error()) {
                        case SCF_ERROR_CONNECTION_BROKEN:
                                ret = ECONNABORTED;
                                goto out;

                        case SCF_ERROR_DELETED:
                                goto add_svc;

                        case SCF_ERROR_EXISTS:
                                goto get_inst;

                        case SCF_ERROR_PERMISSION_DENIED:
                                ret = EPERM;
                                goto out;

                        case SCF_ERROR_BACKEND_ACCESS:
                                ret = EACCES;
                                goto out;

                        case SCF_ERROR_BACKEND_READONLY:
                                ret = EROFS;
                                goto out;

                        case SCF_ERROR_HANDLE_MISMATCH:
                        case SCF_ERROR_INVALID_ARGUMENT:
                        case SCF_ERROR_NOT_SET:
                        default:
                                bad_error("scf_service_add_instance",
                                    scf_error());
                        }
                }
        }

        ret = 0;

out:
        scf_service_destroy(svc);
        scf_scope_destroy(scope);
        return (ret);
}

/*
 * Fails with
 *   ECONNABORTED - repository connection broken
 *   ECANCELED - the transaction's property group was deleted
 */
static int
transaction_add_set(scf_transaction_t *tx, scf_transaction_entry_t *ent,
    const char *pname, scf_type_t type)
{
change_type:
        if (scf_transaction_property_change_type(tx, ent, pname, type) == 0)
                return (0);

        switch (scf_error()) {
        case SCF_ERROR_CONNECTION_BROKEN:
                return (ECONNABORTED);

        case SCF_ERROR_DELETED:
                return (ECANCELED);

        case SCF_ERROR_NOT_FOUND:
                goto new;

        case SCF_ERROR_HANDLE_MISMATCH:
        case SCF_ERROR_INVALID_ARGUMENT:
        case SCF_ERROR_NOT_BOUND:
        case SCF_ERROR_NOT_SET:
        default:
                bad_error("scf_transaction_property_change_type", scf_error());
        }

new:
        if (scf_transaction_property_new(tx, ent, pname, type) == 0)
                return (0);

        switch (scf_error()) {
        case SCF_ERROR_CONNECTION_BROKEN:
                return (ECONNABORTED);

        case SCF_ERROR_DELETED:
                return (ECANCELED);

        case SCF_ERROR_EXISTS:
                goto change_type;

        case SCF_ERROR_HANDLE_MISMATCH:
        case SCF_ERROR_INVALID_ARGUMENT:
        case SCF_ERROR_NOT_BOUND:
        case SCF_ERROR_NOT_SET:
        default:
                bad_error("scf_transaction_property_new", scf_error());
                /* NOTREACHED */
        }
}

static void
scferr(void)
{
        switch (scf_error()) {
        case SCF_ERROR_NO_MEMORY:
                console(B_TRUE, gettext("Out of memory.\n"));
                break;

        case SCF_ERROR_CONNECTION_BROKEN:
                console(B_TRUE, gettext(
                    "Connection to smf(5) repository server broken.\n"));
                break;

        case SCF_ERROR_NO_RESOURCES:
                console(B_TRUE, gettext(
                    "smf(5) repository server is out of memory.\n"));
                break;

        case SCF_ERROR_PERMISSION_DENIED:
                console(B_TRUE, gettext("Insufficient privileges.\n"));
                break;

        default:
                console(B_TRUE, gettext("libscf error: %s\n"),
                    scf_strerror(scf_error()));
        }
}

static void
lscf_set_runlevel(char rl)
{
        scf_handle_t *h;
        scf_instance_t *inst = NULL;
        scf_propertygroup_t *pg = NULL;
        scf_transaction_t *tx = NULL;
        scf_transaction_entry_t *ent = NULL;
        scf_value_t *val = NULL;
        char buf[2];
        int r;

        h = scf_handle_create(SCF_VERSION);
        if (h == NULL) {
                scferr();
                return;
        }

        if (scf_handle_bind(h) != 0) {
                switch (scf_error()) {
                case SCF_ERROR_NO_SERVER:
                        console(B_TRUE,
                            gettext("smf(5) repository server not running.\n"));
                        goto bail;

                default:
                        scferr();
                        goto bail;
                }
        }

        if ((inst = scf_instance_create(h)) == NULL ||
            (pg = scf_pg_create(h)) == NULL ||
            (val = scf_value_create(h)) == NULL ||
            (tx = scf_transaction_create(h)) == NULL ||
            (ent = scf_entry_create(h)) == NULL) {
                scferr();
                goto bail;
        }

get_inst:
        r = get_or_add_startd(inst);
        switch (r) {
        case 0:
                break;

        case ENOMEM:
        case ECONNABORTED:
        case EPERM:
        case EACCES:
        case EROFS:
                scferr();
                goto bail;
        default:
                bad_error("get_or_add_startd", r);
        }

get_pg:
        if (scf_instance_get_pg(inst, SCF_PG_OPTIONS_OVR, pg) != 0) {
                switch (scf_error()) {
                case SCF_ERROR_CONNECTION_BROKEN:
                        scferr();
                        goto bail;

                case SCF_ERROR_DELETED:
                        goto get_inst;

                case SCF_ERROR_NOT_FOUND:
                        break;

                case SCF_ERROR_HANDLE_MISMATCH:
                case SCF_ERROR_INVALID_ARGUMENT:
                case SCF_ERROR_NOT_SET:
                default:
                        bad_error("scf_instance_get_pg", scf_error());
                }

add_pg:
                if (scf_instance_add_pg(inst, SCF_PG_OPTIONS_OVR,
                    SCF_PG_OPTIONS_OVR_TYPE, SCF_PG_OPTIONS_OVR_FLAGS, pg) !=
                    0) {
                        switch (scf_error()) {
                        case SCF_ERROR_CONNECTION_BROKEN:
                        case SCF_ERROR_PERMISSION_DENIED:
                        case SCF_ERROR_BACKEND_ACCESS:
                                scferr();
                                goto bail;

                        case SCF_ERROR_DELETED:
                                goto get_inst;

                        case SCF_ERROR_EXISTS:
                                goto get_pg;

                        case SCF_ERROR_HANDLE_MISMATCH:
                        case SCF_ERROR_INVALID_ARGUMENT:
                        case SCF_ERROR_NOT_SET:
                        default:
                                bad_error("scf_instance_add_pg", scf_error());
                        }
                }
        }

        buf[0] = rl;
        buf[1] = '\0';
        r = scf_value_set_astring(val, buf);
        assert(r == 0);

        for (;;) {
                if (scf_transaction_start(tx, pg) != 0) {
                        switch (scf_error()) {
                        case SCF_ERROR_CONNECTION_BROKEN:
                        case SCF_ERROR_PERMISSION_DENIED:
                        case SCF_ERROR_BACKEND_ACCESS:
                                scferr();
                                goto bail;

                        case SCF_ERROR_DELETED:
                                goto add_pg;

                        case SCF_ERROR_HANDLE_MISMATCH:
                        case SCF_ERROR_NOT_BOUND:
                        case SCF_ERROR_IN_USE:
                        case SCF_ERROR_NOT_SET:
                        default:
                                bad_error("scf_transaction_start", scf_error());
                        }
                }

                r = transaction_add_set(tx, ent, "runlevel", SCF_TYPE_ASTRING);
                switch (r) {
                case 0:
                        break;

                case ECONNABORTED:
                        scferr();
                        goto bail;

                case ECANCELED:
                        scf_transaction_reset(tx);
                        goto add_pg;

                default:
                        bad_error("transaction_add_set", r);
                }

                r = scf_entry_add_value(ent, val);
                assert(r == 0);

                r = scf_transaction_commit(tx);
                if (r == 1)
                        break;

                if (r != 0) {
                        switch (scf_error()) {
                        case SCF_ERROR_CONNECTION_BROKEN:
                        case SCF_ERROR_PERMISSION_DENIED:
                        case SCF_ERROR_BACKEND_ACCESS:
                        case SCF_ERROR_BACKEND_READONLY:
                                scferr();
                                goto bail;

                        case SCF_ERROR_DELETED:
                                scf_transaction_reset(tx);
                                goto add_pg;

                        case SCF_ERROR_INVALID_ARGUMENT:
                        case SCF_ERROR_NOT_BOUND:
                        case SCF_ERROR_NOT_SET:
                        default:
                                bad_error("scf_transaction_commit",
                                    scf_error());
                        }
                }

                scf_transaction_reset(tx);
                (void) scf_pg_update(pg);
        }

bail:
        scf_transaction_destroy(tx);
        scf_entry_destroy(ent);
        scf_value_destroy(val);
        scf_pg_destroy(pg);
        scf_instance_destroy(inst);

        (void) scf_handle_unbind(h);
        scf_handle_destroy(h);
}

/*
 * Function to handle requests from users to main init running as process 1.
 */
static void
userinit(int argc, char **argv)
{
        FILE    *fp;
        char    *ln;
        int     init_signal;
        struct stat     sconbuf, conbuf;
        const char *usage_msg = "Usage: init [0123456SsQqabc]\n";

        /*
         * We are a user invoked init.  Is there an argument and is it
         * a single character?  If not, print usage message and quit.
         */
        if (argc != 2 || argv[1][1] != '\0') {
                (void) fprintf(stderr, usage_msg);
                exit(0);
        }

        if ((init_signal = lvlname_to_state((char)argv[1][0])) == -1) {
                (void) fprintf(stderr, usage_msg);
                (void) audit_put_record(ADT_FAILURE, ADT_FAIL_VALUE_BAD_CMD,
                    argv[1]);
                exit(1);
        }

        if (init_signal == SINGLE_USER) {
                /*
                 * Make sure this process is talking to a legal tty line
                 * and that /dev/syscon is linked to this line.
                 */
                ln = ttyname(0);        /* Get the name of tty */
                if (ln == NULL) {
                        (void) fprintf(stderr,
                            "Standard input not a tty line\n");
                        (void) audit_put_record(ADT_FAILURE,
                            ADT_FAIL_VALUE_BAD_TTY, argv[1]);
                        exit(1);
                }

                if ((stat(ln, &sconbuf) != -1) &&
                    (stat(SYSCON, &conbuf) == -1 ||
                    sconbuf.st_rdev != conbuf.st_rdev)) {
                        /*
                         * /dev/syscon needs to change.
                         * Unlink /dev/syscon and relink it to the current line.
                         */
                        if (lstat(SYSCON, &conbuf) != -1 &&
                            unlink(SYSCON) == FAILURE) {
                                perror("Can't unlink /dev/syscon");
                                (void) fprintf(stderr,
                                    "Run command on the system console.\n");
                                (void) audit_put_record(ADT_FAILURE,
                                    ADT_FAIL_VALUE_PROGRAM, argv[1]);
                                exit(1);
                        }
                        if (symlink(ln, SYSCON) == FAILURE) {
                                (void) fprintf(stderr,
                                    "Can't symlink /dev/syscon to %s: %s", ln,
                                    strerror(errno));

                                /* Try to leave a syscon */
                                (void) link(SYSTTY, SYSCON);
                                (void) audit_put_record(ADT_FAILURE,
                                    ADT_FAIL_VALUE_PROGRAM, argv[1]);
                                exit(1);
                        }

                        /*
                         * Try to leave a message on system console saying where
                         * /dev/syscon is currently connected.
                         */
                        if ((fp = fopen(SYSTTY, "r+")) != NULL) {
                                (void) fprintf(fp,
                                    "\n****     SYSCON CHANGED TO %s    ****\n",
                                    ln);
                                (void) fclose(fp);
                        }
                }
        }

        update_boot_archive(init_signal);

        (void) audit_put_record(ADT_SUCCESS, ADT_SUCCESS, argv[1]);

        /*
         * Signal init; init will take care of telling svc.startd.
         */
        if (kill(init_pid, init_signal) == FAILURE) {
                (void) fprintf(stderr, "Must be super-user\n");
                (void) audit_put_record(ADT_FAILURE,
                    ADT_FAIL_VALUE_AUTH, argv[1]);
                exit(1);
        }

        exit(0);
}


#define DELTA   25      /* Number of pidlist elements to allocate at a time */

/* ARGSUSED */
void
sigpoll(int n)
{
        struct pidrec prec;
        struct pidrec *p = &prec;
        struct pidlist *plp;
        struct pidlist *tp, *savetp;
        int i;

        if (Pfd < 0) {
                return;
        }

        for (;;) {
                /*
                 * Important Note: Either read will really fail (in which case
                 * return is all we can do) or will get EAGAIN (Pfd was opened
                 * O_NDELAY), in which case we also want to return.
                 * Always return from here!
                 */
                if (read(Pfd, p, sizeof (struct pidrec)) !=
                                                sizeof (struct pidrec)) {
                        return;
                }
                switch (p->pd_type) {

                case ADDPID:
                        /*
                         * New "godchild", add to list.
                         */
                        if (Plfree == NULL) {
                                plp = (struct pidlist *)calloc(DELTA,
                                    sizeof (struct pidlist));
                                if (plp == NULL) {
                                        /* Can't save pid */
                                        break;
                                }
                                /*
                                 * Point at 2nd record allocated, we'll use plp.
                                 */
                                tp = plp + 1;
                                /*
                                 * Link them into a chain.
                                 */
                                Plfree = tp;
                                for (i = 0; i < DELTA - 2; i++) {
                                        tp->pl_next = tp + 1;
                                        tp++;
                                }
                        } else {
                                plp = Plfree;
                                Plfree = plp->pl_next;
                        }
                        plp->pl_pid = p->pd_pid;
                        plp->pl_dflag = 0;
                        plp->pl_next = NULL;
                        /*
                         * Note - pid list is kept in increasing order of pids.
                         */
                        if (Plhead == NULL) {
                                Plhead = plp;
                                /* Back up to read next record */
                                break;
                        } else {
                                savetp = tp = Plhead;
                                while (tp) {
                                        if (plp->pl_pid > tp->pl_pid) {
                                                savetp = tp;
                                                tp = tp->pl_next;
                                                continue;
                                        } else if (plp->pl_pid < tp->pl_pid) {
                                                if (tp == Plhead) {
                                                        plp->pl_next = Plhead;
                                                        Plhead = plp;
                                                } else {
                                                        plp->pl_next =
                                                            savetp->pl_next;
                                                        savetp->pl_next = plp;
                                                }
                                                break;
                                        } else {
                                                /* Already in list! */
                                                plp->pl_next = Plfree;
                                                Plfree = plp;
                                                break;
                                        }
                                }
                                if (tp == NULL) {
                                        /* Add to end of list */
                                        savetp->pl_next = plp;
                                }
                        }
                        /* Back up to read next record. */
                        break;

                case REMPID:
                        /*
                         * This one was handled by someone else,
                         * purge it from the list.
                         */
                        if (Plhead == NULL) {
                                /* Back up to read next record. */
                                break;
                        }
                        savetp = tp = Plhead;
                        while (tp) {
                                if (p->pd_pid > tp->pl_pid) {
                                        /* Keep on looking. */
                                        savetp = tp;
                                        tp = tp->pl_next;
                                        continue;
                                } else if (p->pd_pid < tp->pl_pid) {
                                        /* Not in list. */
                                        break;
                                } else {
                                        /* Found it. */
                                        if (tp == Plhead)
                                                Plhead = tp->pl_next;
                                        else
                                                savetp->pl_next = tp->pl_next;
                                        tp->pl_next = Plfree;
                                        Plfree = tp;
                                        break;
                                }
                        }
                        /* Back up to read next record. */
                        break;
                default:
                        console(B_TRUE, "Bad message on initpipe\n");
                        break;
                }
        }
}


static void
cleanaux()
{
        struct pidlist *savep, *p;
        pid_t   pid;
        short   status;

        (void) sighold(SIGCLD);
        Gchild = 0;     /* Note - Safe to do this here since no SIGCLDs */
        (void) sighold(SIGPOLL);
        savep = p = Plhead;
        while (p) {
                if (p->pl_dflag) {
                        /*
                         * Found an entry to delete,
                         * remove it from list first.
                         */
                        pid = p->pl_pid;
                        status = p->pl_exit;
                        if (p == Plhead) {
                                Plhead = p->pl_next;
                                p->pl_next = Plfree;
                                Plfree = p;
                                savep = p = Plhead;
                        } else {
                                savep->pl_next = p->pl_next;
                                p->pl_next = Plfree;
                                Plfree = p;
                                p = savep->pl_next;
                        }
                        clearent(pid, status);
                        continue;
                }
                savep = p;
                p = p->pl_next;
        }
        (void) sigrelse(SIGPOLL);
        (void) sigrelse(SIGCLD);
}


/*
 * /etc/inittab has more entries and we have run out of room in the proc_table
 * array. Double the size of proc_table to accomodate the extra entries.
 */
static void
increase_proc_table_size()
{
        sigset_t block, unblock;
        void *ptr;
        size_t delta = num_proc * sizeof (struct PROC_TABLE);


        /*
         * Block signals for realloc.
         */
        (void) sigfillset(&block);
        (void) sigprocmask(SIG_BLOCK, &block, &unblock);


        /*
         * On failure we just return because callers of this function check
         * for failure.
         */
        do
                ptr = realloc(g_state, g_state_sz + delta);
        while (ptr == NULL && errno == EAGAIN)
                ;

        if (ptr != NULL) {
                /* ensure that the new part is initialized to zero */
                bzero((caddr_t)ptr + g_state_sz, delta);

                g_state = ptr;
                g_state_sz += delta;
                num_proc <<= 1;
        }


        /* unblock our signals before returning */
        (void) sigprocmask(SIG_SETMASK, &unblock, NULL);
}



/*
 * Sanity check g_state.
 */
static int
st_sane()
{
        int i;
        struct PROC_TABLE *ptp;


        /* Note: cur_state is encoded as a signal number */
        if (cur_state < 1 || cur_state == 9 || cur_state > 13)
                return (0);

        /* Check num_proc */
        if (g_state_sz != sizeof (struct init_state) + (num_proc - 1) *
            sizeof (struct PROC_TABLE))
                return (0);

        /* Check proc_table */
        for (i = 0, ptp = proc_table; i < num_proc; ++i, ++ptp) {
                /* skip unoccupied entries */
                if (!(ptp->p_flags & OCCUPIED))
                        continue;

                /* p_flags has no bits outside of PF_MASK */
                if (ptp->p_flags & ~(PF_MASK))
                        return (0);

                /* 5 <= pid <= MAXPID */
                if (ptp->p_pid < 5 || ptp->p_pid > MAXPID)
                        return (0);

                /* p_count >= 0 */
                if (ptp->p_count < 0)
                        return (0);

                /* p_time >= 0 */
                if (ptp->p_time < 0)
                        return (0);
        }

        return (1);
}

/*
 * Initialize our state.
 *
 * If the system just booted, then init_state_file, which is located on an
 * everpresent tmpfs filesystem, should not exist.
 *
 * If we were restarted, then init_state_file should exist, in
 * which case we'll read it in, sanity check it, and use it.
 *
 * Note: You can't call console() until proc_table is ready.
 */
void
st_init()
{
        struct stat stb;
        int ret, st_fd, insane = 0;
        size_t to_be_read;
        char *ptr;


        booting = 1;

        do {
                /*
                 * If we can exclusively create the file, then we're the
                 * initial invocation of init(1M).
                 */
                st_fd = open(init_state_file, O_RDWR | O_CREAT | O_EXCL,
                    S_IRUSR | S_IWUSR);
        } while (st_fd == -1 && errno == EINTR);
        if (st_fd != -1)
                goto new_state;

        booting = 0;

        do {
                st_fd = open(init_state_file, O_RDWR, S_IRUSR | S_IWUSR);
        } while (st_fd == -1 && errno == EINTR);
        if (st_fd == -1)
                goto new_state;

        /* Get the size of the file. */
        do
                ret = fstat(st_fd, &stb);
        while (ret == -1 && errno == EINTR)
                ;
        if (ret == -1)
                goto new_state;

        do
                g_state = malloc(stb.st_size);
        while (g_state == NULL && errno == EAGAIN)
                ;
        if (g_state == NULL)
                goto new_state;

        to_be_read = stb.st_size;
        ptr = (char *)g_state;
        while (to_be_read > 0) {
                ssize_t read_ret;

                read_ret = read(st_fd, ptr, to_be_read);
                if (read_ret < 0) {
                        if (errno == EINTR)
                                continue;

                        goto new_state;
                }

                to_be_read -= read_ret;
                ptr += read_ret;
        }

        (void) close(st_fd);

        g_state_sz = stb.st_size;

        if (st_sane()) {
                console(B_TRUE, "Restarting.\n");
                return;
        }

        insane = 1;

new_state:
        if (st_fd >= 0)
                (void) close(st_fd);
        else
                (void) unlink(init_state_file);

        free(g_state);

        /* Something went wrong, so allocate new state. */
        g_state_sz = sizeof (struct init_state) +
            ((init_num_proc - 1) * sizeof (struct PROC_TABLE));
        do
                g_state = calloc(1, g_state_sz);
        while (g_state == NULL && errno == EAGAIN)
                ;
        if (g_state == NULL) {
                /* Fatal error! */
                exit(errno);
        }

        g_state->ist_runlevel = -1;
        num_proc = init_num_proc;

        if (!booting) {
                console(B_TRUE, "Restarting.\n");

                /* Overwrite the bad state file. */
                st_write();

                if (!insane) {
                        console(B_TRUE,
                            "Error accessing persistent state file `%s'.  "
                            "Ignored.\n", init_state_file);
                } else {
                        console(B_TRUE,
                            "Persistent state file `%s' is invalid and was "
                            "ignored.\n", init_state_file);
                }
        }
}

/*
 * Write g_state out to the state file.
 */
void
st_write()
{
        static int complained = 0;

        int st_fd;
        char *cp;
        size_t sz;
        ssize_t ret;


        do {
                st_fd = open(init_next_state_file,
                    O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR);
        } while (st_fd < 0 && errno == EINTR);
        if (st_fd < 0)
                goto err;

        cp = (char *)g_state;
        sz = g_state_sz;
        while (sz > 0) {
                ret = write(st_fd, cp, sz);
                if (ret < 0) {
                        if (errno == EINTR)
                                continue;

                        goto err;
                }

                sz -= ret;
                cp += ret;
        }

        (void) close(st_fd);
        st_fd = -1;
        if (rename(init_next_state_file, init_state_file)) {
                (void) unlink(init_next_state_file);
                goto err;
        }
        complained = 0;

        return;

err:
        if (st_fd >= 0)
                (void) close(st_fd);

        if (!booting && !complained) {
                /*
                 * Only complain after the filesystem should have come up.
                 * And only do it once so we don't loop between console()
                 * & efork().
                 */
                complained = 1;
                if (st_fd)
                        console(B_TRUE, "Couldn't write persistent state "
                            "file `%s'.\n", init_state_file);
                else
                        console(B_TRUE, "Couldn't move persistent state "
                            "file `%s' to `%s'.\n", init_next_state_file,
                            init_state_file);
        }
}

/*
 * Create a contract with these parameters.
 */
static int
contract_make_template(uint_t info, uint_t critical, uint_t fatal,
    uint64_t cookie)
{
        int fd, err;

        char *ioctl_tset_emsg =
            "Couldn't set \"%s\" contract template parameter: %s.\n";

        do
                fd = open64(CTFS_ROOT "/process/template", O_RDWR);
        while (fd < 0 && errno == EINTR)
                ;
        if (fd < 0) {
                console(B_TRUE, "Couldn't create process template: %s.\n",
                    strerror(errno));
                return (-1);
        }

        if (err = ct_pr_tmpl_set_param(fd, CT_PR_INHERIT | CT_PR_REGENT))
                console(B_TRUE, "Contract set template inherit, regent "
                    "failed: %s.\n", strerror(err));

        /*
         * These errors result in a misconfigured template, which is better
         * than no template at all, so warn but don't abort.
         */
        if (err = ct_tmpl_set_informative(fd, info))
                console(B_TRUE, ioctl_tset_emsg, "informative", strerror(err));

        if (err = ct_tmpl_set_critical(fd, critical))
                console(B_TRUE, ioctl_tset_emsg, "critical", strerror(err));

        if (err = ct_pr_tmpl_set_fatal(fd, fatal))
                console(B_TRUE, ioctl_tset_emsg, "fatal", strerror(err));

        if (err = ct_tmpl_set_cookie(fd, cookie))
                console(B_TRUE, ioctl_tset_emsg, "cookie", strerror(err));

        (void) fcntl(fd, F_SETFD, FD_CLOEXEC);

        return (fd);
}

/*
 * Create the templates and open an event file descriptor.  We use dup2(2) to
 * get these descriptors away from the stdin/stdout/stderr group.
 */
static void
contracts_init()
{
        int err, fd;

        /*
         * Create & configure a legacy template.  We only want empty events so
         * we know when to abandon them.
         */
        legacy_tmpl = contract_make_template(0, CT_PR_EV_EMPTY, CT_PR_EV_HWERR,
            ORDINARY_COOKIE);
        if (legacy_tmpl >= 0) {
                err = ct_tmpl_activate(legacy_tmpl);
                if (err != 0) {
                        (void) close(legacy_tmpl);
                        legacy_tmpl = -1;
                        console(B_TRUE,
                            "Couldn't activate legacy template (%s); "
                            "legacy services will be in init's contract.\n",
                            strerror(err));
                }
        } else
                console(B_TRUE,
                    "Legacy services will be in init's contract.\n");

        if (dup2(legacy_tmpl, 255) == -1) {
                console(B_TRUE, "Could not duplicate legacy template: %s.\n",
                    strerror(errno));
        } else {
                (void) close(legacy_tmpl);
                legacy_tmpl = 255;
        }

        (void) fcntl(legacy_tmpl, F_SETFD, FD_CLOEXEC);

        startd_tmpl = contract_make_template(0, CT_PR_EV_EMPTY,
            CT_PR_EV_HWERR | CT_PR_EV_SIGNAL | CT_PR_EV_CORE, STARTD_COOKIE);

        if (dup2(startd_tmpl, 254) == -1) {
                console(B_TRUE, "Could not duplicate startd template: %s.\n",
                    strerror(errno));
        } else {
                (void) close(startd_tmpl);
                startd_tmpl = 254;
        }

        (void) fcntl(startd_tmpl, F_SETFD, FD_CLOEXEC);

        if (legacy_tmpl < 0 && startd_tmpl < 0) {
                /* The creation errors have already been reported. */
                console(B_TRUE,
                    "Ignoring contract events.  Core smf(5) services will not "
                    "be restarted.\n");
                return;
        }

        /*
         * Open an event endpoint.
         */
        do
                fd = open64(CTFS_ROOT "/process/pbundle", O_RDONLY);
        while (fd < 0 && errno == EINTR)
                ;
        if (fd < 0) {
                console(B_TRUE,
                    "Couldn't open process pbundle: %s.  Core smf(5) services "
                    "will not be restarted.\n", strerror(errno));
                return;
        }

        if (dup2(fd, 253) == -1) {
                console(B_TRUE, "Could not duplicate process bundle: %s.\n",
                    strerror(errno));
        } else {
                (void) close(fd);
                fd = 253;
        }

        (void) fcntl(fd, F_SETFD, FD_CLOEXEC);

        /* Reset in case we've been restarted. */
        (void) ct_event_reset(fd);

        poll_fds[0].fd = fd;
        poll_fds[0].events = POLLIN;
        poll_nfds = 1;
}

static int
contract_getfile(ctid_t id, const char *name, int oflag)
{
        int fd;

        do
                fd = contract_open(id, "process", name, oflag);
        while (fd < 0 && errno == EINTR)
                ;

        if (fd < 0)
                console(B_TRUE, "Couldn't open %s for contract %ld: %s.\n",
                    name, id, strerror(errno));

        return (fd);
}

static int
contract_cookie(ctid_t id, uint64_t *cp)
{
        int fd, err;
        ct_stathdl_t sh;

        fd = contract_getfile(id, "status", O_RDONLY);
        if (fd < 0)
                return (-1);

        err = ct_status_read(fd, CTD_COMMON, &sh);
        if (err != 0) {
                console(B_TRUE, "Couldn't read status of contract %ld: %s.\n",
                    id, strerror(err));
                (void) close(fd);
                return (-1);
        }

        (void) close(fd);

        *cp = ct_status_get_cookie(sh);

        ct_status_free(sh);
        return (0);
}

static void
contract_ack(ct_evthdl_t e)
{
        int fd;

        if (ct_event_get_flags(e) & CTE_INFO)
                return;

        fd = contract_getfile(ct_event_get_ctid(e), "ctl", O_WRONLY);
        if (fd < 0)
                return;

        (void) ct_ctl_ack(fd, ct_event_get_evid(e));
        (void) close(fd);
}

/*
 * Process a contract event.
 */
static void
contract_event(struct pollfd *poll)
{
        ct_evthdl_t e;
        int err;
        ctid_t ctid;

        if (!(poll->revents & POLLIN)) {
                if (poll->revents & POLLERR)
                        console(B_TRUE,
                            "Unknown poll error on my process contract "
                            "pbundle.\n");
                return;
        }

        err = ct_event_read(poll->fd, &e);
        if (err != 0) {
                console(B_TRUE, "Error retrieving contract event: %s.\n",
                    strerror(err));
                return;
        }

        ctid = ct_event_get_ctid(e);

        if (ct_event_get_type(e) == CT_PR_EV_EMPTY) {
                uint64_t cookie;
                int ret, abandon = 1;

                /* If it's svc.startd, restart it.  Else, abandon. */
                ret = contract_cookie(ctid, &cookie);

                if (ret == 0) {
                        if (cookie == STARTD_COOKIE &&
                            do_restart_startd) {
                                if (smf_debug)
                                        console(B_TRUE, "Restarting "
                                            "svc.startd.\n");

                                /*
                                 * Account for the failure.  If the failure rate
                                 * exceeds a threshold, then drop to maintenance
                                 * mode.
                                 */
                                startd_record_failure();
                                if (startd_failure_rate_critical())
                                        enter_maintenance();

                                if (startd_tmpl < 0)
                                        console(B_TRUE,
                                            "Restarting svc.startd in "
                                            "improper contract (bad "
                                            "template).\n");

                                (void) startd_run(startd_cline, startd_tmpl,
                                    ctid);

                                abandon = 0;
                        }
                }

                if (abandon && (err = contract_abandon_id(ctid))) {
                        console(B_TRUE, "Couldn't abandon contract %ld: %s.\n",
                            ctid, strerror(err));
                }

                /*
                 * No need to acknowledge the event since either way the
                 * originating contract should be abandoned.
                 */
        } else {
                console(B_TRUE,
                    "Received contract event of unexpected type %d from "
                    "contract %ld.\n", ct_event_get_type(e), ctid);

                if ((ct_event_get_flags(e) & (CTE_INFO | CTE_ACK)) == 0)
                        /* Allow unexpected critical events to be released. */
                        contract_ack(e);
        }

        ct_event_free(e);
}

/*
 * svc.startd(1M) Management
 */

/*
 * (Re)start svc.startd(1M).  old_ctid should be the contract ID of the old
 * contract, or 0 if we're starting it for the first time.  If wait is true
 * we'll wait for and return the exit value of the child.
 */
static int
startd_run(const char *cline, int tmpl, ctid_t old_ctid)
{
        int err, i, ret, did_activate;
        pid_t pid;
        struct stat sb;

        if (cline[0] == '\0')
                return (-1);

        /*
         * Don't restart startd if the system is rebooting or shutting down.
         */
        do {
                ret = stat("/etc/svc/volatile/resetting", &sb);
        } while (ret == -1 && errno == EINTR);

        if (ret == 0) {
                if (smf_debug)
                        console(B_TRUE, "Quiescing for reboot.\n");
                (void) pause();
                return (-1);
        }

        err = ct_pr_tmpl_set_transfer(tmpl, old_ctid);
        if (err == EINVAL) {
                console(B_TRUE, "Remake startd_tmpl; reattempt transfer.\n");
                tmpl = startd_tmpl = contract_make_template(0, CT_PR_EV_EMPTY,
                    CT_PR_EV_HWERR, STARTD_COOKIE);

                err = ct_pr_tmpl_set_transfer(tmpl, old_ctid);
        }
        if (err != 0) {
                console(B_TRUE,
                    "Couldn't set transfer parameter of contract template: "
                    "%s.\n", strerror(err));
        }

        if ((err = ct_pr_tmpl_set_svc_fmri(startd_tmpl,
            SCF_SERVICE_STARTD)) != 0)
                console(B_TRUE,
                    "Can not set svc_fmri in contract template: %s\n",
                    strerror(err));
        if ((err = ct_pr_tmpl_set_svc_aux(startd_tmpl,
            startd_svc_aux)) != 0)
                console(B_TRUE,
                    "Can not set svc_aux in contract template: %s\n",
                    strerror(err));
        did_activate = !(ct_tmpl_activate(tmpl));
        if (!did_activate)
                console(B_TRUE,
                    "Template activation failed; not starting \"%s\" in "
                    "proper contract.\n", cline);

        /* Hold SIGCLD so we can wait if necessary. */
        (void) sighold(SIGCLD);

        while ((pid = fork()) < 0) {
                if (errno == EPERM) {
                        console(B_TRUE, "Insufficient permission to fork.\n");

                        /* Now that's a doozy. */
                        exit(1);
                }

                console(B_TRUE,
                    "fork() for svc.startd failed: %s.  Will retry in 1 "
                    "second...\n", strerror(errno));

                (void) sleep(1);

                /* Eventually give up? */
        }

        if (pid == 0) {
                /* child */

                /* See the comment in efork() */
                for (i = SIGHUP; i <= SIGRTMAX; ++i) {
                        if (i == SIGTTOU || i == SIGTTIN || i == SIGTSTP)
                                (void) sigset(i, SIG_IGN);
                        else
                                (void) sigset(i, SIG_DFL);
                }

                if (smf_options != NULL) {
                        /* Put smf_options in the environment. */
                        glob_envp[glob_envn] =
                            malloc(sizeof ("SMF_OPTIONS=") - 1 +
                            strlen(smf_options) + 1);

                        if (glob_envp[glob_envn] != NULL) {
                                /* LINTED */
                                (void) sprintf(glob_envp[glob_envn],
                                    "SMF_OPTIONS=%s", smf_options);
                                glob_envp[glob_envn+1] = NULL;
                        } else {
                                console(B_TRUE,
                                    "Could not set SMF_OPTIONS (%s).\n",
                                    strerror(errno));
                        }
                }

                if (smf_debug)
                        console(B_TRUE, "Executing svc.startd\n");

                (void) execle(SH, "INITSH", "-c", cline, NULL, glob_envp);

                console(B_TRUE, "Could not exec \"%s\" (%s).\n", SH,
                    strerror(errno));

                exit(1);
        }

        /* parent */

        if (did_activate) {
                if (legacy_tmpl < 0 || ct_tmpl_activate(legacy_tmpl) != 0)
                        (void) ct_tmpl_clear(tmpl);
        }

        /* Clear the old_ctid reference so the kernel can reclaim it. */
        if (old_ctid != 0)
                (void) ct_pr_tmpl_set_transfer(tmpl, 0);

        (void) sigrelse(SIGCLD);

        return (0);
}

/*
 * void startd_record_failure(void)
 *   Place the current time in our circular array of svc.startd failures.
 */
void
startd_record_failure()
{
        int index = startd_failure_index++ % NSTARTD_FAILURE_TIMES;

        startd_failure_time[index] = gethrtime();
}

/*
 * int startd_failure_rate_critical(void)
 *   Return true if the average failure interval is less than the permitted
 *   interval.  Implicit success if insufficient measurements for an average
 *   exist.
 */
int
startd_failure_rate_critical()
{
        int n = startd_failure_index;
        hrtime_t avg_ns = 0;

        if (startd_failure_index < NSTARTD_FAILURE_TIMES)
                return (0);

        avg_ns =
            (startd_failure_time[(n - 1) % NSTARTD_FAILURE_TIMES] -
            startd_failure_time[n % NSTARTD_FAILURE_TIMES]) /
            NSTARTD_FAILURE_TIMES;

        return (avg_ns < STARTD_FAILURE_RATE_NS);
}

/*
 * returns string that must be free'd
 */

static char
*audit_boot_msg()
{
        char            *b, *p;
        char            desc[] = "booted";
        zoneid_t        zid = getzoneid();

        b = malloc(sizeof (desc) + MAXNAMELEN + 3);
        if (b == NULL)
                return (b);

        p = b;
        p += strlcpy(p, desc, sizeof (desc));
        if (zid != GLOBAL_ZONEID) {
                p += strlcpy(p, ": ", 3);
                (void) getzonenamebyid(zid, p, MAXNAMELEN);
        }
        return (b);
}

/*
 * Generate AUE_init_solaris audit record.  Return 1 if
 * auditing is enabled in case the caller cares.
 *
 * In the case of userint() or a local zone invocation of
 * one_true_init, the process initially contains the audit
 * characteristics of the process that invoked init.  The first pass
 * through here uses those characteristics then for the case of
 * one_true_init in a local zone, clears them so subsequent system
 * state changes won't be attributed to the person who booted the
 * zone.
 */
static int
audit_put_record(int pass_fail, int status, char *msg)
{
        adt_session_data_t      *ah;
        adt_event_data_t        *event;

        if (!adt_audit_enabled())
                return (0);

        /*
         * the PROC_DATA picks up the context to tell whether this is
         * an attributed record (auid = -2 is unattributed)
         */
        if (adt_start_session(&ah, NULL, ADT_USE_PROC_DATA)) {
                console(B_TRUE, "audit failure:  %s\n", strerror(errno));
                return (1);
        }
        event = adt_alloc_event(ah, ADT_init_solaris);
        if (event == NULL) {
                console(B_TRUE, "audit failure:  %s\n", strerror(errno));
                (void) adt_end_session(ah);
                return (1);
        }
        event->adt_init_solaris.info = msg;     /* NULL is ok here */

        if (adt_put_event(event, pass_fail, status)) {
                console(B_TRUE, "audit failure:  %s\n", strerror(errno));
                (void) adt_end_session(ah);
                return (1);
        }
        adt_free_event(event);

        (void) adt_end_session(ah);

        return (1);
}