/* 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 */ #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); }