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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*
* Written by Rick Sladkey <jrs@world.std.com>
*
* setsid.c -- execute a command in a new session
*
* 1999-02-22 Arkadiusz Miśkiewicz <misiek@pld.ORG.PL>
* - added Native Language Support
*
* 2001-01-18 John Fremlin <vii@penguinpowered.com>
* - fork in case we are process group leader
*
* 2008-08-20 Daniel Kahn Gillmor <dkg@fifthhorseman.net>
* - if forked, wait on child process and emit its return code.
*/
#include <getopt.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "c.h"
#include "nls.h"
#include "closestream.h"
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out, _(
" %s [options] <program> [arguments ...]\n"),
program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Run a program in a new session.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -c, --ctty set the controlling terminal to the current one\n"), out);
fputs(_(" -f, --fork always fork\n"), out);
fputs(_(" -w, --wait wait program to exit, and use the same return\n"), out);
fprintf(out, USAGE_HELP_OPTIONS(16));
fprintf(out, USAGE_MAN_TAIL("setsid(1)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int ch, forcefork = 0;
int ctty = 0;
pid_t pid;
int status = 0;
static const struct option longopts[] = {
{"ctty", no_argument, NULL, 'c'},
{"fork", no_argument, NULL, 'f'},
{"wait", no_argument, NULL, 'w'},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
while ((ch = getopt_long(argc, argv, "+Vhcfw", longopts, NULL)) != -1)
switch (ch) {
case 'c':
ctty=1;
break;
case 'f':
forcefork = 1;
break;
case 'w':
status = 1;
break;
case 'h':
usage();
case 'V':
print_version(EXIT_SUCCESS);
default:
errtryhelp(EXIT_FAILURE);
}
if (argc - optind < 1) {
warnx(_("no command specified"));
errtryhelp(EXIT_FAILURE);
}
if (forcefork || getpgrp() == getpid()) {
pid = fork();
switch (pid) {
case -1:
err(EXIT_FAILURE, _("fork"));
case 0:
/* child */
break;
default:
/* parent */
if (!status)
return EXIT_SUCCESS;
if (wait(&status) != pid)
err(EXIT_FAILURE, "wait");
if (WIFEXITED(status))
return WEXITSTATUS(status);
err(status, _("child %d did not exit normally"), pid);
}
}
if (setsid() < 0)
/* cannot happen */
err(EXIT_FAILURE, _("setsid failed"));
if (ctty && ioctl(STDIN_FILENO, TIOCSCTTY, 1))
err(EXIT_FAILURE, _("failed to set the controlling terminal"));
execvp(argv[optind], argv + optind);
errexec(argv[optind]);
}
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