[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * setsid.c -- execute a command in a new session
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| 4 | * Rick Sladkey <jrs@world.std.com>
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| 5 | * In the public domain.
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| 6 | *
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[2725] | 7 | * 1999-02-22 Arkadiusz Mickiewicz <misiek@pld.ORG.PL>
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[821] | 8 | * - added Native Language Support
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| 9 | *
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| 10 | * 2001-01-18 John Fremlin <vii@penguinpowered.com>
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| 11 | * - fork in case we are process group leader
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| 12 | *
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| 13 | * 2004-11-12 Paul Fox
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| 14 | * - busyboxed
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| 15 | */
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| 16 |
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[3232] | 17 | //usage:#define setsid_trivial_usage
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| 18 | //usage: "PROG ARGS"
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| 19 | //usage:#define setsid_full_usage "\n\n"
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| 20 | //usage: "Run PROG in a new session. PROG will have no controlling terminal\n"
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| 21 | //usage: "and will not be affected by keyboard signals (Ctrl-C etc).\n"
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| 22 | //usage: "See setsid(2) for details."
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| 23 |
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[1765] | 24 | #include "libbb.h"
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[821] | 25 |
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[2725] | 26 | int setsid_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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| 27 | int setsid_main(int argc UNUSED_PARAM, char **argv)
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[821] | 28 | {
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[2725] | 29 | if (!argv[1])
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[821] | 30 | bb_show_usage();
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| 31 |
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[2725] | 32 | /* setsid() is allowed only when we are not a process group leader.
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| 33 | * Otherwise our PID serves as PGID of some existing process group
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| 34 | * and cannot be used as PGID of a new process group. */
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| 35 | if (setsid() < 0) {
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| 36 | pid_t pid = fork_or_rexec(argv);
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| 37 | if (pid != 0) {
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| 38 | /* parent */
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| 39 | /* TODO:
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| 40 | * we can waitpid(pid, &status, 0) and then even
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| 41 | * emulate exitcode, making the behavior consistent
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| 42 | * in both forked and non forked cases.
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| 43 | * However, the code is larger and upstream
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| 44 | * does not do such trick.
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| 45 | */
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| 46 | exit(EXIT_SUCCESS);
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| 47 | }
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[821] | 48 |
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[2725] | 49 | /* child */
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| 50 | /* now there should be no error: */
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| 51 | setsid();
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| 52 | }
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[821] | 53 |
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[2725] | 54 | argv++;
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| 55 | BB_EXECVP_or_die(argv);
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[821] | 56 | }
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