Contents of /tags/mkinitrd-6_3_2/busybox/miscutils/setsid.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 1215 byte(s)
tagged 'mkinitrd-6_3_2'
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 | #include "libbb.h" |
18 | |
19 | int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
20 | int setsid_main(int argc UNUSED_PARAM, char **argv) |
21 | { |
22 | if (!argv[1]) |
23 | bb_show_usage(); |
24 | |
25 | /* setsid() is allowed only when we are not a process group leader. |
26 | * Otherwise our PID serves as PGID of some existing process group |
27 | * and cannot be used as PGID of a new process group. */ |
28 | if (setsid() < 0) { |
29 | pid_t pid = fork_or_rexec(argv); |
30 | if (pid != 0) { |
31 | /* parent */ |
32 | /* TODO: |
33 | * we can waitpid(pid, &status, 0) and then even |
34 | * emulate exitcode, making the behavior consistent |
35 | * in both forked and non forked cases. |
36 | * However, the code is larger and upstream |
37 | * does not do such trick. |
38 | */ |
39 | exit(EXIT_SUCCESS); |
40 | } |
41 | |
42 | /* child */ |
43 | /* now there should be no error: */ |
44 | setsid(); |
45 | } |
46 | |
47 | argv++; |
48 | BB_EXECVP_or_die(argv); |
49 | } |