source: branches/3.2/mindi-busybox/miscutils/setsid.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.5 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * setsid.c -- execute a command in a new session
4 * Rick Sladkey <jrs@world.std.com>
5 * In the public domain.
6 *
7 * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
8 * - added Native Language Support
9 *
10 * 2001-01-18 John Fremlin <vii@penguinpowered.com>
11 * - fork in case we are process group leader
12 *
13 * 2004-11-12 Paul Fox
14 * - busyboxed
15 */
16
17//usage:#define setsid_trivial_usage
18//usage:       "PROG ARGS"
19//usage:#define setsid_full_usage "\n\n"
20//usage:       "Run PROG in a new session. PROG will have no controlling terminal\n"
21//usage:       "and will not be affected by keyboard signals (Ctrl-C etc).\n"
22//usage:       "See setsid(2) for details."
23
24#include "libbb.h"
25
26int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
27int setsid_main(int argc UNUSED_PARAM, char **argv)
28{
29    if (!argv[1])
30        bb_show_usage();
31
32    /* setsid() is allowed only when we are not a process group leader.
33     * Otherwise our PID serves as PGID of some existing process group
34     * and cannot be used as PGID of a new process group. */
35    if (setsid() < 0) {
36        pid_t pid = fork_or_rexec(argv);
37        if (pid != 0) {
38            /* parent */
39            /* TODO:
40             * we can waitpid(pid, &status, 0) and then even
41             * emulate exitcode, making the behavior consistent
42             * in both forked and non forked cases.
43             * However, the code is larger and upstream
44             * does not do such trick.
45             */
46            exit(EXIT_SUCCESS);
47        }
48
49        /* child */
50        /* now there should be no error: */
51        setsid();
52    }
53
54    argv++;
55    BB_EXECVP_or_die(argv);
56}
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