usr/src/lib/libshell/common/include/jobs.h

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1982-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                  David Korn <dgk@research.att.com>                   *
  18 *                                                                      *
  19 ***********************************************************************/
  20 #pragma prototyped
  21 #ifndef JOB_NFLAG
  22 /*
  23  *      Interface to job control for shell
  24  *      written by David Korn
  25  *
  26  */
  27
  28 #define JOBTTY  2
  29
  30 #include        <ast.h>
  31 #include        <sfio.h>
  32 #ifndef SIGINT
  33 #   include     <signal.h>
  34 #endif /* !SIGINT */
  35 #include        "FEATURE/options"
  36
  37 #undef JOBS
  38 #if defined(SIGCLD) && !defined(SIGCHLD)
  39 #   define SIGCHLD      SIGCLD
  40 #endif
  41 #ifdef SIGCHLD
  42 #   define JOBS 1
  43 #   include     "terminal.h"
  44 #   ifdef FIOLOOKLD
  45         /* Ninth edition */
  46         extern int tty_ld, ntty_ld;
  47 #       define OTTYDISC tty_ld
  48 #       define NTTYDISC ntty_ld
  49 #   endif       /* FIOLOOKLD */
  50 #else
  51 #   undef SIGTSTP
  52 #   undef SH_MONITOR
  53 #   define SH_MONITOR   0
  54 #   define job_set(x)
  55 #   define job_reset(x)
  56 #endif
  57
  58 struct process
  59 {
  60         struct process *p_nxtjob;       /* next job structure */
  61         struct process *p_nxtproc;      /* next process in current job */
  62         pid_t           p_pid;          /* process id */
  63         pid_t           p_pgrp;         /* process group */
  64         pid_t           p_fgrp;         /* process group when stopped */
  65         short           p_job;          /* job number of process */
  66         unsigned short  p_exit;         /* exit value or signal number */
  67         unsigned short  p_exitmin;      /* minimum exit value for xargs */
  68         unsigned short  p_flag;         /* flags - see below */
  69         int             p_env;          /* subshell environment number */
  70 #ifdef JOBS
  71         off_t           p_name;         /* history file offset for command */
  72         struct termios  p_stty;         /* terminal state for job */
  73 #endif /* JOBS */
  74 };
  75
  76 struct jobs
  77 {
  78         struct process  *pwlist;        /* head of process list */
  79         pid_t           curpgid;        /* current process gid id */
  80         pid_t           parent;         /* set by fork() */
  81         pid_t           mypid;          /* process id of shell */
  82         pid_t           mypgid;         /* process group id of shell */
  83         pid_t           mytgid;         /* terminal group id of shell */
  84         unsigned int    in_critical;    /* >0 => in critical region */
  85         int             savesig;        /* active signal */
  86         int             numpost;        /* number of posted jobs */
  87 #ifdef SHOPT_BGX
  88         int             numbjob;        /* number of background jobs */
  89 #endif /* SHOPT_BGX */
  90         short           fd;             /* tty descriptor number */
  91 #ifdef JOBS
  92         int             suspend;        /* suspend character */
  93         int             linedisc;       /* line dicipline */
  94 #endif /* JOBS */
  95         char            jobcontrol;     /* turned on for real job control */
  96         char            waitsafe;       /* wait will not block */
  97         char            waitall;        /* wait for all jobs in pipe */
  98         char            toclear;        /* job table needs clearing */
  99         unsigned char   *freejobs;      /* free jobs numbers */
 100 };
 101
 102 /* flags for joblist */
 103 #define JOB_LFLAG       1
 104 #define JOB_NFLAG       2
 105 #define JOB_PFLAG       4
 106 #define JOB_NLFLAG      8
 107
 108 extern struct jobs job;
 109
 110 #ifdef JOBS
 111
 112 #if !_std_malloc
 113 #include <vmalloc.h>
 114 #if VMALLOC_VERSION >= 20070911L
 115 #define vmbusy()        (vmstat(0,0)!=0)
 116 #endif
 117 #endif
 118 #ifndef vmbusy
 119 #define vmbusy()        0
 120 #endif
 121
 122 #define job_lock()      (job.in_critical++)
 123 #define job_unlock()    \
 124         do { \
 125                 int     sig; \
 126                 if (!--job.in_critical && (sig = job.savesig)) \
 127                 { \
 128                         if (!job.in_critical++ && !vmbusy()) \
 129                                 job_reap(sig); \
 130                         job.in_critical--; \
 131                 } \
 132         } while(0)
 133
 134 extern const char       e_jobusage[];
 135 extern const char       e_done[];
 136 extern const char       e_running[];
 137 extern const char       e_coredump[];
 138 extern const char       e_no_proc[];
 139 extern const char       e_no_job[];
 140 extern const char       e_jobsrunning[];
 141 extern const char       e_nlspace[];
 142 extern const char       e_access[];
 143 extern const char       e_terminate[];
 144 extern const char       e_no_jctl[];
 145 extern const char       e_signo[];
 146 #ifdef SIGTSTP
 147    extern const char    e_no_start[];
 148 #endif /* SIGTSTP */
 149 #ifdef NTTYDISC
 150    extern const char    e_newtty[];
 151    extern const char    e_oldtty[];
 152 #endif /* NTTYDISC */
 153 #endif  /* JOBS */
 154
 155 /*
 156  * The following are defined in jobs.c
 157  */
 158
 159 extern void     job_clear(void);
 160 extern void     job_bwait(char**);
 161 extern int      job_walk(Sfio_t*,int(*)(struct process*,int),int,char*[]);
 162 extern int      job_kill(struct process*,int);
 163 extern int      job_wait(pid_t);
 164 extern int      job_post(pid_t,pid_t);
 165 extern void     *job_subsave(void);
 166 extern void     job_subrestore(void*);
 167 #ifdef SHOPT_BGX
 168 extern void     job_chldtrap(Shell_t*, const char*,int);
 169 #endif /* SHOPT_BGX */
 170 #ifdef JOBS
 171         extern void     job_init(Shell_t*,int);
 172         extern int      job_close(Shell_t*);
 173         extern int      job_list(struct process*,int);
 174         extern int      job_terminate(struct process*,int);
 175         extern int      job_switch(struct process*,int);
 176         extern void     job_fork(pid_t);
 177         extern int      job_reap(int);
 178 #else
 179 #       define job_init(s,flag)
 180 #       define job_close(s)     (0)
 181 #       define job_fork(p)
 182 #endif  /* JOBS */
 183
 184
 185 #endif /* !JOB_NFLAG */