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