101 lines
1.9 KiB
C
101 lines
1.9 KiB
C
/* A simple program to print information about process groups */
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#include "config.h"
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#include <stdio.h>
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#include <sys/types.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif /* HAVE_STDLIB_H */
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_FCNTL_H
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# include <fcntl.h>
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#else /* HAVE_FCNTL_H */
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# include <sys/file.h>
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#endif /* HAVE_FCNTL_H */
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#ifdef BSD_PGRP
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# include <sys/ioctl.h>
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int
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tcgetpgrp(fd)
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int fd;
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{
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int r, grp;
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if ((r = ioctl(fd, TIOCGPGRP, &grp)) < 0)
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return r;
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return grp;
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}
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# define getPGRP() getpgrp(0)
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#else /* BSD_PGRP */
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# define getPGRP() getpgrp()
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#endif /* BSD_PGRP */
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int usage();
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char *progname = "check-pgrp";
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int
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main(argc, argv)
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int argc;
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char **argv;
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{
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extern int optind;
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extern char *optarg;
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int opt;
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int ttyfd = 0;
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int my_pgrp, my_pid, my_ppid, tty_pgrp;
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char *tty_name;
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char *e;
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if (argc > 0 && argv[0] && *argv[0])
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progname = argv[0];
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while ((opt = getopt(argc, argv, "u:")) != EOF) {
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switch (opt) {
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case 'u':
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ttyfd = atoi(optarg);
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break;
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default:
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usage(1);
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}
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}
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if (optind != argc) {
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fprintf(stderr, "%s: too many arguments\n", progname);
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usage(0);
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}
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my_pid = getpid();
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my_ppid = getppid();
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my_pgrp = getPGRP();
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tty_pgrp = tcgetpgrp(ttyfd);
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tty_name = ttyname(ttyfd);
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printf("in %s pgrp\ntty %s (%s)\npid %d, ppid %d, pgrp %d, tty_pgrp %d\n",
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my_pgrp == my_pid ? "my own"
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: (my_pgrp == my_ppid ? "parent's" : "unknown"),
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tty_name ? tty_name : "(none)",
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tty_pgrp == my_pgrp ? "mine"
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: (tty_pgrp == my_ppid ? "parent's" : "unknown"),
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my_pid, my_ppid, my_pgrp, tty_pgrp);
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return 0;
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}
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int
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usage(verbose)
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int verbose;
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{
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fprintf(stderr, "Usage: %s [-?] [-u fd]\n", progname);
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if (verbose)
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fprintf(stderr, "\
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-u fd use fd as tty fd (default is 0)\n\
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");
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exit(1);
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return 0;
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}
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