etc/services - sync with NetBSD-8

[minix.git] / minix / tests / test77.c

/* Tests for opening/closing pseudo terminals - by D.C. van Moolenbroek */
/*
 * As of the introduction of Unix98 PTY support, this test set actually relies
 * on the ability to create Unix98 PTYs.  The system still supports old-style
 * PTYs but there is no way to force openpty(3) to use them.  However, part of
 * this test set can still be used to test old-style PTYs: first disable Unix98
 * PTYs, for example by unmounting PTYFS or temporarily removing /dev/ptmx, and
 * then run the a-f subtests from this test set as root.
 */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <signal.h>
#include <termios.h>
#include <sys/wait.h>
#include <sys/syslimits.h>
#include <paths.h>
#include <dirent.h>
#include <grp.h>
#include <fcntl.h>
#include <util.h>

#define ITERATIONS 10

#define MIN_PTYS 4

#include "common.h"

static int sighups;             /* number of SIGHUP signals received */

/*
 * Signal handler for SIGHUP and SIGUSR1.
 */
static void
signal_handler(int sig)
{
        if (sig == SIGHUP)
                sighups++;
}

/*
 * Set the slave side of the pseudo terminal to raw mode.  This simplifies
 * testing communication.
 */
static void
make_raw(int slavefd)
{
        struct termios tios;

        if (tcgetattr(slavefd, &tios) < 0) e(0);

        cfmakeraw(&tios);

        if (tcsetattr(slavefd, TCSANOW, &tios) < 0) e(0);
}

/*
 * See if the given pseudo terminal can successfully perform basic
 * communication between master and slave.
 */
static void
test_comm(int masterfd, int slavefd)
{
        char c;

        make_raw(slavefd);

        c = 'A';
        if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (c != 'A') e(0);

        c = 'B';
        if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (c != 'B') e(0);

        c = 'C';
        if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (c != 'C') e(0);

        c = 'D';
        if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (c != 'D') e(0);
}

/*
 * Obtain a pseudo terminal.  The master end is opened and its file descriptor
 * stored in 'pfd'.  The slave path name is stored in 'tname'.  For old-style
 * PTYs, the function returns 1 and stores the master name in 'pname' if not
 * NULL.  For Unix98 PTYs, the function returns 0, in which case no master name
 * is available.  For old-style PTYs, the caller may close and reopen the
 * master.  In that case, we make the assumption that nobody snatches the pair
 * while we are running.  For Unix98 PTYs, the master must be kept open.
 */
static int
get_pty(int *pfd, char pname[PATH_MAX], char tname[PATH_MAX])
{
        char *name;
        int len, masterfd, slavefd;

        /*
         * First try Unix98 PTY allocation, mainly to avoid opening the slave
         * end immediately.  If this fails, try openpty(3) as well.
         */
        if ((masterfd = posix_openpt(O_RDWR | O_NOCTTY)) != -1) {
                if (grantpt(masterfd) != -1 && unlockpt(masterfd) != -1 &&
                    (name = ptsname(masterfd)) != NULL) {
                        *pfd = masterfd;
                        strlcpy(tname, name, PATH_MAX);

                        return 0;
                }
                if (close(masterfd) < 0) e(0);
        }

        if (openpty(&masterfd, &slavefd, tname, NULL, NULL) < 0) e(0);

        test_comm(masterfd, slavefd);

        *pfd = masterfd;

        if (close(slavefd) < 0) e(0);

        /*
         * openpty(3) gives us only the slave name, but we also want the master
         * name.
         */
        len = strlen(_PATH_DEV);
        if (strncmp(tname, _PATH_DEV, len)) e(0);

        if (strncmp(&tname[len], "tty", 3))
                return 0; /* Unix98 after all?  Well okay, whatever.. */

        if (pname != NULL) {
                strlcpy(pname, tname, PATH_MAX);
                pname[len] = 'p';
        }

        return 1;
}

/*
 * Test various orders of opening and closing the master and slave sides of a
 * pseudo terminal, as well as opening/closing one side without ever opening
 * the other.  This test is meaningful mainly for old-style pseudoterminals.
 */
static void
test77a(void)
{
        struct sigaction act, oact;
        char pname[PATH_MAX], tname[PATH_MAX];
        int oldstyle, masterfd, slavefd;

        subtest = 1;

        /* We do not want to get SIGHUP signals in this test. */
        memset(&act, 0, sizeof(act));
        act.sa_handler = SIG_IGN;
        if (sigaction(SIGHUP, &act, &oact) < 0) e(0);

        /* Obtain a pseudo terminal. */
        oldstyle = get_pty(&masterfd, pname, tname);

        if (oldstyle) {
                /* Try closing the master. */
                if (close(masterfd) < 0) e(0);

                /* See if we can reopen the master. */
                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
        }

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        /* In the meantime, test different closing orders. This is order A. */
        if (close(slavefd) < 0) e(0);
        if (close(masterfd) < 0) e(0);

        /* Now try opening the pair (or a new pair) again. */
        if (!oldstyle)
                oldstyle = get_pty(&masterfd, pname, tname);
        else
                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);

        /*
         * Try reopening the slave after closing it.  It is not very important
         * that this works, but the TTY driver should currently support it.
         */
        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        /* This is closing order B. This may or may not cause a SIGHUP. */
        if (close(masterfd) < 0) e(0);
        if (close(slavefd) < 0) e(0);

        /* Try the normal open procedure. */
        if (!oldstyle)
                oldstyle = get_pty(&masterfd, pname, tname);
        else
                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);
        if (close(masterfd) < 0) e(0);

        /*
         * Try reopening and closing the slave, without opening the master.
         * This should work on old-style PTYS, but not on Unix98 PTYs.
         */
        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) >= 0) {
                if (!oldstyle) e(0);

                if (close(slavefd) < 0) e(0);
        } else
                if (oldstyle) e(0);

        /* Again, try the normal open procedure. */
        if (!oldstyle)
                oldstyle = get_pty(&masterfd, pname, tname);
        else
                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);
        if (close(masterfd) < 0) e(0);

        /*
         * Finally, try opening the slave first.  This does not work with
         * Unix98 PTYs.
         */
        if (oldstyle) {
                if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);
                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);

                test_comm(masterfd, slavefd);

                if (close(slavefd) < 0) e(0);
                if (close(masterfd) < 0) e(0);
        }

        if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}

/*
 * Test opening a single side multiple times.
 */
static void
test77b(void)
{
        char pname[PATH_MAX], tname[PATH_MAX];
        int oldstyle, masterfd, slavefd, extrafd;

        subtest = 2;

        /* Obtain a pseudo terminal. */
        oldstyle = get_pty(&masterfd, pname, tname);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        /*
         * It must not be possible to open the master multiple times.  Doing so
         * is possible only if we have a named master, i.e., an old-style PTY.
         */
        test_comm(masterfd, slavefd);

        if (oldstyle) {
                if ((extrafd = open(pname, O_RDWR | O_NOCTTY)) >= 0) e(0);
                if (errno != EIO) e(0);
        }

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);
        if (close(masterfd) < 0) e(0);

        /* The slave can be opened multiple times, though. */
        oldstyle = get_pty(&masterfd, pname, tname);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, slavefd);

        if ((extrafd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        test_comm(masterfd, extrafd);
        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);
        if (close(extrafd) < 0) e(0);
        if (close(masterfd) < 0) e(0);
}

/*
 * Test communication on half-open pseudo terminals.
 */
static void
test77c(void)
{
        struct sigaction act, oact;
        char pname[PATH_MAX], tname[PATH_MAX];
        int oldstyle, masterfd, slavefd;
        char c;

        subtest = 3;

        /* We do not want to get SIGHUP signals in this test. */
        memset(&act, 0, sizeof(act));
        act.sa_handler = SIG_IGN;
        if (sigaction(SIGHUP, &act, &oact) < 0) e(0);

        /* Obtain a pseudo terminal. */
        oldstyle = get_pty(&masterfd, pname, tname);

        /*
         * For old-style pseudo terminals, we have just opened and closed the
         * slave end, which alters the behavior we are testing below.  Close
         * and reopen the master to start fresh.
         */
        if (oldstyle) {
                if (close(masterfd) < 0) e(0);

                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);
        }

        /* Writes to the master should be buffered until there is a slave. */
        c = 'E';
        if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        make_raw(slavefd);

        if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
        if (c != 'E') e(0);

        /* Discard the echo on the master. */
        if (tcflush(slavefd, TCOFLUSH) != 0) e(0);

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);

        /* Writes to the master after the slave has been closed should fail. */
        if (write(masterfd, &c, sizeof(c)) >= 0) e(0);
        if (errno != EIO) e(0);

        if (oldstyle)
                if (close(masterfd) < 0) e(0);

        /*
         * Writes to the slave should be buffered until there is a master.
         * This applies to old-style PTYs only.
         */
        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        if (oldstyle) {
                make_raw(slavefd);

                c = 'F';
                if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);

                if ((masterfd = open(pname, O_RDWR | O_NOCTTY)) < 0) e(0);

                if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
                if (c != 'F') e(0);
        }

        test_comm(masterfd, slavefd);

        if (close(masterfd) < 0) e(0);

        if (write(slavefd, &c, sizeof(c)) >= 0) e(0);
        if (errno != EIO) e(0);

        /* Reads from the slave should return EOF if the master is gone. */
        if (read(slavefd, &c, sizeof(c)) != 0) e(0);

        if (close(slavefd) < 0) e(0);

        if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}

/*
 * Wait for a child process to terminate.  Return 0 if the child exited without
 * errors, -1 otherwise.
 */
static int
waitchild(void)
{
        int status;

        if (wait(&status) <= 0) return -1;
        if (!WIFEXITED(status)) return -1;
        if (WEXITSTATUS(status) != 0) return -1;

        return 0;
}

/*
 * Test opening the slave side with and without the O_NOCTTY flag.
 */
static void
test77d(void)
{
        char pname[PATH_MAX], tname[PATH_MAX];
        int masterfd, slavefd;

        subtest = 4;

        /* Make ourselves process group leader if we aren't already. */
        (void)setsid();

        /* Obtain a pseudo terminal. */
        (void)get_pty(&masterfd, NULL, tname);

        /*
         * Opening the slave with O_NOCTTY should not change its controlling
         * terminal.
         */
        switch (fork()) {
        case 0:
                if (close(masterfd) < 0) e(0);

                if (setsid() < 0) e(0);

                if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

                if (open("/dev/tty", O_RDWR) >= 0) e(0);
                if (errno != ENXIO) e(0);

                exit(errct);
        case -1:
                e(0);
        default:
                break;
        }

        if (waitchild() < 0) e(0);

        if (close(masterfd) < 0) e(0);

        (void)get_pty(&masterfd, pname, tname);

        /*
         * Opening the slave without O_NOCTTY should change its controlling
         * terminal, though.
         */
        switch (fork()) {
        case 0:
                if (close(masterfd) < 0) e(0);

                if (setsid() < 0) e(0);

                if ((slavefd = open(tname, O_RDWR)) < 0) e(0);

                if (open("/dev/tty", O_RDWR) < 0) e(0);

                exit(errct);
        case -1:
                e(0);
        default:
                break;
        }

        if (waitchild() < 0) e(0);

        if (close(masterfd) < 0) e(0);
}

/*
 * Test receiving of SIGHUP on master hang-up.  All of the tests so far have
 * ignored SIGHUP, and probably would not have received one anyway, since the
 * process was not its own session leader.  Time to test this aspect.
 */
static void
test77e(void)
{
        struct sigaction act, hup_oact, usr_oact;
        sigset_t set, oset;
        char tname[PATH_MAX];
        int masterfd, slavefd;

        subtest = 5;

        memset(&act, 0, sizeof(act));
        act.sa_handler = signal_handler;
        if (sigaction(SIGHUP, &act, &hup_oact) < 0) e(0);

        memset(&act, 0, sizeof(act));
        act.sa_handler = signal_handler;
        if (sigaction(SIGUSR1, &act, &usr_oact) < 0) e(0);

        sigemptyset(&set);
        sigaddset(&set, SIGHUP);
        sigaddset(&set, SIGUSR1);
        if (sigprocmask(SIG_BLOCK, &set, &oset) < 0) e(0);

        sighups = 0;

        /* Make ourselves process group leader if we aren't already. */
        (void)setsid();

        /* Obtain a pseudo terminal. */
        (void)get_pty(&masterfd, NULL, tname);

        switch (fork()) {
        case 0:
                if (close(masterfd) < 0) e(0);

                /* Become session leader. */
                if (setsid() < 0) e(0);

                if ((slavefd = open(tname, O_RDWR)) < 0) e(0);

                /* Tell the parent we are ready. */
                kill(getppid(), SIGUSR1);

                /* We should now get a SIGHUP. */
                set = oset;
                if (sigsuspend(&set) >= 0) e(0);

                if (sighups != 1) e(0);

                exit(errct);
        case -1:
                e(0);
        default:
                break;
        }

        /* Wait for SIGUSR1 from the child. */
        set = oset;
        if (sigsuspend(&set) >= 0) e(0);

        /* Closing the master should now raise a SIGHUP signal in the child. */
        if (close(masterfd) < 0) e(0);

        if (waitchild() < 0) e(0);

        if (sigprocmask(SIG_SETMASK, &oset, NULL) < 0) e(0);

        if (sigaction(SIGHUP, &hup_oact, NULL) < 0) e(0);
        if (sigaction(SIGUSR1, &usr_oact, NULL) < 0) e(0);
}

/*
 * Test basic select functionality on /dev/tty.  While this test should not be
 * part of this test set, we already have all the infrastructure we need here.
 */
static void
test77f(void)
{
        struct sigaction act, oact;
        char c, tname[PATH_MAX];
        struct timeval tv;
        fd_set fd_set;
        int fd, maxfd, masterfd, slavefd;

        subtest = 6;

        /* We do not want to get SIGHUP signals in this test. */
        memset(&act, 0, sizeof(act));
        act.sa_handler = SIG_IGN;
        if (sigaction(SIGHUP, &act, &oact) < 0) e(0);

        /* Obtain a pseudo terminal. */
        (void)get_pty(&masterfd, NULL, tname);

        switch (fork()) {
        case 0:
                if (close(masterfd) < 0) e(0);

                if (setsid() < 0) e(0);

                if ((slavefd = open(tname, O_RDWR)) < 0) e(0);

                if ((fd = open("/dev/tty", O_RDWR)) < 0) e(0);

                make_raw(fd);

                /* Without slave input, /dev/tty is not ready for reading. */
                FD_ZERO(&fd_set);
                FD_SET(fd, &fd_set);
                tv.tv_sec = 0;
                tv.tv_usec = 0;

                if (select(fd + 1, &fd_set, NULL, NULL, &tv) != 0) e(0);
                if (FD_ISSET(fd, &fd_set)) e(0);

                FD_SET(fd, &fd_set);
                tv.tv_sec = 0;
                tv.tv_usec = 10000;

                if (select(fd + 1, &fd_set, NULL, NULL, &tv) != 0) e(0);
                if (FD_ISSET(fd, &fd_set)) e(0);

                /* It will be ready for writing, though. */
                FD_SET(fd, &fd_set);

                if (select(fd + 1, NULL, &fd_set, NULL, NULL) != 1) e(0);
                if (!FD_ISSET(fd, &fd_set)) e(0);

                /* Test mixing file descriptors to the same terminal. */
                FD_ZERO(&fd_set);
                FD_SET(fd, &fd_set);
                FD_SET(slavefd, &fd_set);
                tv.tv_sec = 0;
                tv.tv_usec = 10000;

                maxfd = fd > slavefd ? fd : slavefd;
                if (select(maxfd + 1, &fd_set, NULL, NULL, &tv) != 0) e(0);
                if (FD_ISSET(fd, &fd_set)) e(0);
                if (FD_ISSET(slavefd, &fd_set)) e(0);

                /* The delayed echo on the master must wake up our select. */
                c = 'A';
                if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);

                FD_ZERO(&fd_set);
                FD_SET(fd, &fd_set);

                if (select(fd + 1, &fd_set, NULL, NULL, NULL) != 1) e(0);
                if (!FD_ISSET(fd, &fd_set)) e(0);

                /* Select must now still flag readiness for reading. */
                tv.tv_sec = 0;
                tv.tv_usec = 0;

                if (select(fd + 1, &fd_set, NULL, NULL, &tv) != 1) e(0);
                if (!FD_ISSET(fd, &fd_set)) e(0);

                /* That is, until we read the byte. */
                if (read(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);
                if (c != 'B') e(0);

                if (select(fd + 1, &fd_set, NULL, NULL, &tv) != 0) e(0);
                if (FD_ISSET(fd, &fd_set)) e(0);

                /* Ask the parent to close the master. */
                c = 'C';
                if (write(slavefd, &c, sizeof(c)) != sizeof(c)) e(0);

                FD_SET(fd, &fd_set);

                /* The closure must cause an EOF condition on the slave. */
                if (select(fd + 1, &fd_set, NULL, NULL, NULL) != 1) e(0);
                if (!FD_ISSET(fd, &fd_set)) e(0);

                if (select(fd + 1, &fd_set, NULL, NULL, NULL) != 1) e(0);
                if (!FD_ISSET(fd, &fd_set)) e(0);

                if (read(slavefd, &c, sizeof(c)) != 0) e(0);

                exit(errct);
        case -1:
                e(0);
        default:
                /* Wait for the child to write something to the slave. */
                FD_ZERO(&fd_set);
                FD_SET(masterfd, &fd_set);

                if (select(masterfd + 1, &fd_set, NULL, NULL, NULL) != 1)
                        e(0);
                if (!FD_ISSET(masterfd, &fd_set)) e(0);

                if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
                if (c != 'A') e(0);

                /* Write a reply once the child is blocked in its select. */
                tv.tv_sec = 1;
                tv.tv_usec = 0;
                if (select(masterfd + 1, &fd_set, NULL, NULL, &tv) != 0)
                        e(0);

                c = 'B';
                if (write(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);

                /* Wait for the child to request closing the master. */
                if (read(masterfd, &c, sizeof(c)) != sizeof(c)) e(0);
                if (c != 'C') e(0);

                /* Close the master once the child is blocked in its select. */
                sleep(1);

                close(masterfd);

                break;
        }

        if (waitchild() < 0) e(0);

        if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}

/*
 * See if the directory contents of /dev/pts are as we expect.  We have to keep
 * in mind that other programs may have pseudo terminals open while we are
 * running, although we assume that those programs do not open or close PTYs
 * while we are running.
 */
static void
test_getdents(int nindex, int array[3], int present[3])
{
        struct group *group;
        DIR *dirp;
        struct dirent *dp;
        struct stat buf;
        char path[PATH_MAX], *endp;
        gid_t tty_gid;
        int i, n, seen_dot, seen_dotdot, seen_index[3], *seen;

        seen_dot = seen_dotdot = 0;
        for (i = 0; i < nindex; i++)
                seen_index[i] = 0;

        if ((group = getgrnam("tty")) == NULL) e(0);
        tty_gid = group->gr_gid;

        if ((dirp = opendir(_PATH_DEV_PTS)) == NULL) e(0);

        while ((dp = readdir(dirp)) != NULL) {
                snprintf(path, sizeof(path), _PATH_DEV_PTS "%s", dp->d_name);
                if (stat(path, &buf) < 0) e(0);

                if (!strcmp(dp->d_name, ".") || !strcmp(dp->d_name, "..")) {
                        seen =
                            (dp->d_name[1] == '.') ? &seen_dot : &seen_dotdot;
                        if (*seen) e(0);
                        *seen = 1;

                        /* Check basic dirent and stat fields. */
                        if (dp->d_type != DT_DIR) e(0);
                        if (dp->d_name[1] == '\0' &&
                            buf.st_ino != dp->d_fileno) e(0);
                        if (!S_ISDIR(buf.st_mode)) e(0);
                        if (buf.st_nlink < 2) e(0);
                } else {
                        /* The file name must be a number. */
                        errno = 0;
                        n = strtol(dp->d_name, &endp, 10);
                        if (errno != 0) e(0);
                        if (dp->d_name[0] == '\0' || *endp != '\0') e(0);
                        if (n < 0) e(0);

                        /* Check basic dirent and stat fields. */
                        if (dp->d_type != DT_CHR) e(0);
                        if (buf.st_ino != dp->d_fileno) e(0);
                        if (!S_ISCHR(buf.st_mode)) e(0);
                        if (buf.st_nlink != 1) e(0);
                        if (buf.st_size != 0) e(0);
                        if (buf.st_rdev == 0) e(0);

                        /* Is this one of the PTYs we created? */
                        for (i = 0; i < nindex; i++) {
                                if (array[i] == n) {
                                        if (seen_index[i]) e(0);
                                        seen_index[i] = 1;

                                        break;
                                }
                        }

                        /* If so, perform some extra tests. */
                        if (i < nindex) {
                                if ((buf.st_mode & ALLPERMS) != 0620) e(0);
                                if (buf.st_uid != getuid()) e(0);
                                if (buf.st_gid != tty_gid) e(0);
                        }
                }
        }

        if (closedir(dirp) < 0) e(0);

        if (!seen_dot) e(0);
        if (!seen_dotdot) e(0);
        for (i = 0; i < nindex; i++)
                if (seen_index[i] != present[i]) e(0);
}

/*
 * Obtain a Unix98 PTY.  Return an open file descriptor for the master side,
 * and store the name of the slave side in 'tptr'.
 */
static int
get_unix98_pty(char ** tptr)
{
        int masterfd;

        if ((masterfd = posix_openpt(O_RDWR | O_NOCTTY)) < 0) e(0);

        if (grantpt(masterfd) < 0) e(0);

        /* This call is a no-op on MINIX3. */
        if (unlockpt(masterfd) < 0) e(0);

        if ((*tptr = ptsname(masterfd)) == NULL) e(0);

        return masterfd;
}

/*
 * Test for Unix98 PTY support and PTYFS.
 */
static void
test77g(void)
{
        char *tname;
        struct stat buf;
        size_t len;
        int i, masterfd, slavefd, fd[3], array[3], present[3];

        subtest = 7;

        /*
         * Test basic operation, and verify that the slave node disappears
         * after both sides of the pseudo terminal have been closed.  We check
         * different combinations of open master and slave ends (with 'i'):
         * 0) opening and closing the master only, 1) closing a slave before
         * the master, and 2) closing the slave after the master.
         */
        for (i = 0; i <= 2; i++) {
                masterfd = get_unix98_pty(&tname);

                if (access(tname, R_OK | W_OK) < 0) e(0);

                if (i > 0) {
                        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0)
                                e(0);

                        if (access(tname, R_OK | W_OK) < 0) e(0);

                        if (i > 1) {
                                if (close(masterfd) < 0) e(0);

                                masterfd = slavefd; /* ugly but saving code */
                        } else
                                if (close(slavefd) < 0) e(0);
                }

                if (access(tname, R_OK | W_OK) < 0) e(0);

                if (close(masterfd) < 0) e(0);

                if (access(tname, R_OK | W_OK) == 0) e(0);
        }

        /*
         * Test whether we can open multiple pseudo terminals.  We need to be
         * able to open three PTYs.  Verify that they are properly listed in
         * the /dev/pts directory contents, and have proper attributes set.
         */
        test_getdents(0, NULL, NULL);

        for (i = 0; i < 3; i++) {
                fd[i] = get_unix98_pty(&tname);

                /* Figure out the slave index number. */
                len = strlen(_PATH_DEV_PTS);
                if (strncmp(tname, _PATH_DEV_PTS, strlen(_PATH_DEV_PTS))) e(0);
                array[i] = atoi(&tname[len]);
                present[i] = 1;
        }

        test_getdents(3, array, present);

        if (close(fd[0]) < 0) e(0);
        present[0] = 0;

        test_getdents(3, array, present);

        if (close(fd[2]) < 0) e(0);
        present[2] = 0;

        test_getdents(3, array, present);

        if (close(fd[1]) < 0) e(0);
        present[1] = 0;

        test_getdents(3, array, present);

        /*
         * Test chmod(2) on a slave node, and multiple calls to grantpt(3).
         * The first grantpt(3) call should create the slave node (we currently
         * can not test this: the slave node may be created earlier as well,
         * but we do not know its name), whereas subsequent grantpt(3) calls
         * should reset its mode, uid, and gid.  Testing the latter two and
         * chown(2) on the slave node requires root, so we skip that part.
         *
         * Finally, NetBSD revokes access to existing slave file descriptors
         * upon a call to grantpt(3).  This is not a POSIX requirement, but
         * NetBSD needs this for security reasons because it already creates
         * the slave node when the master is opened (and it does not lock the
         * slave until a call to unlockpt(3)).  MINIX3 does not implement
         * revocation this way, because the slave node is created only upon the
         * call to grantpt(3), thus leaving no insecure window for the slave
         * side between posix_openpt(3) and grantpt(3).  While this behavior
         * may be changed later, we test for the lack of revocation here now.
         */
        masterfd = get_unix98_pty(&tname);

        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

        if (stat(tname, &buf) != 0) e(0);
        if (buf.st_mode != (S_IFCHR | 0620)) e(0);

        if (chmod(tname, S_IFCHR | 0630) != 0) e(0);

        if (stat(tname, &buf) != 0) e(0);
        if (buf.st_mode != (S_IFCHR | 0630)) e(0);

        if (grantpt(masterfd) != 0) e(0);

        if (stat(tname, &buf) != 0) e(0);
        if (buf.st_mode != (S_IFCHR | 0620)) e(0);

        test_comm(masterfd, slavefd);

        if (close(slavefd) < 0) e(0);
        if (close(masterfd) < 0) e(0);

        test_getdents(0, NULL, NULL);
}

/*
 * Check that the given PTY index, which is in use for an old-style PTY, is not
 * allocated through Unix98 PTY allocation.  This test is not foolproof, but it
 * does the job well enough.
 */
static void
test_overlap(int m)
{
        char *tname;
        size_t len;
        int i, n, fd[MIN_PTYS];

        for (i = 0; i < MIN_PTYS; i++) {
                if ((fd[i] = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
                        break; /* out of PTYs */
                if (grantpt(fd[i]) < 0) e(0);
                if (unlockpt(fd[i]) < 0) e(0);
                if ((tname = ptsname(fd[i])) == NULL) e(0);

                len = strlen(_PATH_DEV_PTS);
                if (strncmp(tname, _PATH_DEV_PTS, strlen(_PATH_DEV_PTS))) e(0);
                n = atoi(&tname[len]);
                if (n < 0 || n > 9) e(0);

                if (m == n) e(0);
        }

        for (i--; i >= 0; i--)
                if (close(fd[i]) < 0) e(0);
}

/*
 * Test for mixing access to old-style and Unix98 PTYs.  Since the PTY service
 * internally shares the set of pseudo terminals between the two types, it has
 * to implement checks to prevent that a PTY opened as one type is also
 * accessed through the other type.  We test some of those checks here.
 */
static void
test77h(void)
{
        char *tname, ptest[PATH_MAX], ttest[PATH_MAX];
        struct sigaction act, oact;
        size_t len;
        int i, n, masterfd, slavefd;

        subtest = 8;

        /* We do not want to get SIGHUP signals in this test. */
        memset(&act, 0, sizeof(act));
        act.sa_handler = SIG_IGN;
        if (sigaction(SIGHUP, &act, &oact) < 0) e(0);

        /*
         * Check that Unix98 PTYs cannot be accessed through old-style device
         * nodes.  We check different combinations of open master and
         * slave ends for the Unix98 side (with 'i'): 0) opening and closing
         * the master only, 1) closing a slave before the master, and 2)
         * closing the slave after the master.
         *
         * This test relies on the implementation aspect that /dev/ttypN and
         * /dev/pts/N (with N in the range 0..9) map to the same PTY.  It also
         * relies on lack of concurrent PTY allocation outside the test.
         */
        for (i = 0; i <= 2; i++) {
                /* Open a Unix98 PTY and get the slave name. */
                masterfd = get_unix98_pty(&tname);

                /* Figure out the slave index number. */
                len = strlen(_PATH_DEV_PTS);
                if (strncmp(tname, _PATH_DEV_PTS, strlen(_PATH_DEV_PTS))) e(0);
                n = atoi(&tname[len]);
                if (n < 0 || n > 9) e(0);

                /* Use this index number to create old-style device names. */
                snprintf(ptest, sizeof(ptest), _PATH_DEV "ptyp%u", n);
                snprintf(ttest, sizeof(ttest), _PATH_DEV "ttyp%u", n);

                /*
                 * Now make sure that opening the old-style master and slave
                 * fails as long as either side of the Unix98 PTY is open.
                 */
                if (open(ptest, O_RDWR | O_NOCTTY) >= 0) e(0);
                if (errno != EACCES && errno != EIO) e(0);
                if (open(ttest, O_RDWR | O_NOCTTY) >= 0) e(0);
                if (errno != EACCES && errno != EIO) e(0);

                if (i > 0) {
                        if ((slavefd = open(tname, O_RDWR | O_NOCTTY)) < 0)
                                e(0);

                        if (open(ptest, O_RDWR | O_NOCTTY) >= 0) e(0);
                        if (errno != EACCES && errno != EIO) e(0);
                        if (open(ttest, O_RDWR | O_NOCTTY) >= 0) e(0);
                        if (errno != EACCES && errno != EIO) e(0);

                        if (close(slavefd) < 0) e(0);

                        if (i > 1) {
                                if (open(ptest, O_RDWR | O_NOCTTY) >= 0) e(0);
                                if (errno != EACCES && errno != EIO) e(0);
                                if (open(ttest, O_RDWR | O_NOCTTY) >= 0) e(0);
                                if (errno != EACCES && errno != EIO) e(0);

                                if ((slavefd =
                                    open(tname, O_RDWR | O_NOCTTY)) < 0) e(0);

                                if (open(ptest, O_RDWR | O_NOCTTY) >= 0) e(0);
                                if (errno != EACCES && errno != EIO) e(0);
                                if (open(ttest, O_RDWR | O_NOCTTY) >= 0) e(0);
                                if (errno != EACCES && errno != EIO) e(0);

                                if (close(masterfd) < 0) e(0);

                                masterfd = slavefd; /* ugly but saving code */
                        }

                        if (open(ptest, O_RDWR | O_NOCTTY) >= 0) e(0);
                        if (errno != EACCES && errno != EIO) e(0);
                        if (open(ttest, O_RDWR | O_NOCTTY) >= 0) e(0);
                        if (errno != EACCES && errno != EIO) e(0);
                }

                if (close(masterfd) < 0) e(0);

                /*
                 * Once both Unix98 sides are closed, the pseudo terminal can
                 * be reused.  Thus, opening the old-style master should now
                 * succeed.  However, it is possible that we do not have
                 * permission to open the master at all.
                 */
                if ((masterfd = open(ptest, O_RDWR | O_NOCTTY)) < 0 &&
                    errno != EACCES) e(0);

                if (masterfd >= 0 && close(masterfd) < 0) e(0);
        }

        /*
         * The reverse test, which would check that old-style PTYs cannot be
         * accessed through Unix98 device nodes, is impossible to perform
         * properly without root privileges, as we would have to create device
         * nodes manually with mknod(2).  All we can do here is ensure that if
         * an old-style PTY is opened, it will not also be allocated as a
         * Unix98 PTY.  We do a rather basic check, but only if we can open an
         * old-style master at all.  We check two closing orders (with 'i'):
         * 0) the slave first, 1) the master first.  Here, we make the hard
         * assumption that the system supports at least four pseudo terminals,
         * of which at least one is currently free.
         */
        for (i = 0; i <= 1; i++) {
                for (n = 0; n < MIN_PTYS; n++) {
                        snprintf(ptest, sizeof(ptest), _PATH_DEV "ptyp%u", n);

                        if ((masterfd = open(ptest, O_RDWR | O_NOCTTY)) >= 0)
                                break;
                }

                if (n >= MIN_PTYS)
                        break;

                test_overlap(n);

                snprintf(ttest, sizeof(ttest), _PATH_DEV "ttyp%u", n);

                /* We can do part of the test only if we can open the slave. */
                if ((slavefd = open(ttest, O_RDWR | O_NOCTTY)) >= 0) {
                        test_overlap(n);

                        if (i > 0) {
                                if (close(masterfd) < 0) e(0);

                                masterfd = slavefd; /* again, ugly */
                        } else
                                if (close(slavefd) < 0) e(0);

                        test_overlap(n);
                }

                if (close(masterfd) < 0) e(0);
        }

        if (sigaction(SIGHUP, &oact, NULL) < 0) e(0);
}

int
main(int argc, char **argv)
{
        int i, m;

        start(77);

        if (argc == 2)
                m = atoi(argv[1]);
        else
                m = 0xFF;

        for (i = 0; i < ITERATIONS; i++) {
                if (m & 0x01) test77a();
                if (m & 0x02) test77b();
                if (m & 0x04) test77c();
                if (m & 0x08) test77d();
                if (m & 0x10) test77e();
                if (m & 0x20) test77f();
                if (m & 0x40) test77g();
                if (m & 0x80) test77h();
        }

        quit();
}