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