| /* vi: set sw=4 ts=4: */ |
| /* |
| * setsid.c -- execute a command in a new session |
| * Rick Sladkey <jrs@world.std.com> |
| * In the public domain. |
| * |
| * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL> |
| * - added Native Language Support |
| * |
| * 2001-01-18 John Fremlin <vii@penguinpowered.com> |
| * - fork in case we are process group leader |
| * |
| * 2004-11-12 Paul Fox |
| * - busyboxed |
| */ |
| |
| //usage:#define setsid_trivial_usage |
| //usage: "PROG ARGS" |
| //usage:#define setsid_full_usage "\n\n" |
| //usage: "Run PROG in a new session. PROG will have no controlling terminal\n" |
| //usage: "and will not be affected by keyboard signals (Ctrl-C etc).\n" |
| //usage: "See setsid(2) for details." |
| |
| #include "libbb.h" |
| |
| int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int setsid_main(int argc UNUSED_PARAM, char **argv) |
| { |
| if (!argv[1]) |
| bb_show_usage(); |
| |
| /* setsid() is allowed only when we are not a process group leader. |
| * Otherwise our PID serves as PGID of some existing process group |
| * and cannot be used as PGID of a new process group. */ |
| if (setsid() < 0) { |
| pid_t pid = fork_or_rexec(argv); |
| if (pid != 0) { |
| /* parent */ |
| /* TODO: |
| * we can waitpid(pid, &status, 0) and then even |
| * emulate exitcode, making the behavior consistent |
| * in both forked and non forked cases. |
| * However, the code is larger and upstream |
| * does not do such trick. |
| */ |
| exit(EXIT_SUCCESS); |
| } |
| |
| /* child */ |
| /* now there should be no error: */ |
| setsid(); |
| } |
| |
| argv++; |
| BB_EXECVP_or_die(argv); |
| } |