| /* |
| * setsid.c -- execute a command in a new session |
| * Rick Sladkey <jrs@world.std.com> |
| * In the public domain. |
| * |
| * 1999-02-22 Arkadiusz MiĆkiewicz <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); |
| |
| printf(USAGE_HELP_OPTIONS(16)); |
| |
| printf(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); |
| atexit(close_stdout); |
| |
| while ((ch = getopt_long(argc, argv, "+Vhcfw", longopts, NULL)) != -1) |
| switch (ch) { |
| case 'V': |
| printf(UTIL_LINUX_VERSION); |
| return EXIT_SUCCESS; |
| case 'c': |
| ctty=1; |
| break; |
| case 'f': |
| forcefork = 1; |
| break; |
| case 'w': |
| status = 1; |
| break; |
| case 'h': |
| usage(); |
| 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]); |
| } |