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Commit | Line | Data |
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6dbe3af9 KZ |
1 | /* |
2 | * setsid.c -- execute a command in a new session | |
3 | * Rick Sladkey <jrs@world.std.com> | |
4 | * In the public domain. | |
7eda085c | 5 | * |
b50945d4 | 6 | * 1999-02-22 Arkadiusz MiĆkiewicz <misiek@pld.ORG.PL> |
7eda085c KZ |
7 | * - added Native Language Support |
8 | * | |
c07ebfa1 KZ |
9 | * 2001-01-18 John Fremlin <vii@penguinpowered.com> |
10 | * - fork in case we are process group leader | |
11 | * | |
0dde1997 DKG |
12 | * 2008-08-20 Daniel Kahn Gillmor <dkg@fifthhorseman.net> |
13 | * - if forked, wait on child process and emit its return code. | |
6dbe3af9 KZ |
14 | */ |
15 | ||
cbfa3253 | 16 | #include <getopt.h> |
6dbe3af9 | 17 | #include <stdio.h> |
6dbe3af9 | 18 | #include <stdlib.h> |
cbfa3253 | 19 | #include <unistd.h> |
97669624 | 20 | #include <sys/ioctl.h> |
0dde1997 DKG |
21 | #include <sys/types.h> |
22 | #include <sys/wait.h> | |
cbfa3253 SK |
23 | |
24 | #include "c.h" | |
7eda085c | 25 | #include "nls.h" |
efb8854f | 26 | #include "closestream.h" |
6dbe3af9 | 27 | |
6e1eda6f | 28 | static void __attribute__((__noreturn__)) usage(void) |
cbfa3253 | 29 | { |
6e1eda6f | 30 | FILE *out = stdout; |
7c3c355f | 31 | fputs(USAGE_HEADER, out); |
8a2f04dd | 32 | fprintf(out, _( |
7c3c355f KZ |
33 | " %s [options] <program> [arguments ...]\n"), |
34 | program_invocation_short_name); | |
35 | ||
451dbcfa BS |
36 | fputs(USAGE_SEPARATOR, out); |
37 | fputs(_("Run a program in a new session.\n"), out); | |
38 | ||
7c3c355f | 39 | fputs(USAGE_OPTIONS, out); |
0dde1997 | 40 | fputs(_(" -c, --ctty set the controlling terminal to the current one\n"), out); |
18017621 | 41 | fputs(_(" -f, --fork always fork\n"), out); |
0dde1997 | 42 | fputs(_(" -w, --wait wait program to exit, and use the same return\n"), out); |
7c3c355f | 43 | |
f45f3ec3 | 44 | printf(USAGE_HELP_OPTIONS(16)); |
7c3c355f | 45 | |
f45f3ec3 | 46 | printf(USAGE_MAN_TAIL("setsid(1)")); |
6e1eda6f | 47 | exit(EXIT_SUCCESS); |
cbfa3253 SK |
48 | } |
49 | ||
50 | int main(int argc, char **argv) | |
51 | { | |
18017621 | 52 | int ch, forcefork = 0; |
8a2f04dd | 53 | int ctty = 0; |
0dde1997 DKG |
54 | pid_t pid; |
55 | int status = 0; | |
8a2f04dd | 56 | |
cbfa3253 | 57 | static const struct option longopts[] = { |
8a2f04dd | 58 | {"ctty", no_argument, NULL, 'c'}, |
18017621 | 59 | {"fork", no_argument, NULL, 'f'}, |
0dde1997 | 60 | {"wait", no_argument, NULL, 'w'}, |
cbfa3253 SK |
61 | {"version", no_argument, NULL, 'V'}, |
62 | {"help", no_argument, NULL, 'h'}, | |
63 | {NULL, 0, NULL, 0} | |
64 | }; | |
65 | ||
7eda085c KZ |
66 | setlocale(LC_ALL, ""); |
67 | bindtextdomain(PACKAGE, LOCALEDIR); | |
68 | textdomain(PACKAGE); | |
2c308875 | 69 | close_stdout_atexit(); |
cbfa3253 | 70 | |
18017621 | 71 | while ((ch = getopt_long(argc, argv, "+Vhcfw", longopts, NULL)) != -1) |
cbfa3253 | 72 | switch (ch) { |
8a2f04dd HH |
73 | case 'c': |
74 | ctty=1; | |
75 | break; | |
18017621 KZ |
76 | case 'f': |
77 | forcefork = 1; | |
78 | break; | |
0dde1997 DKG |
79 | case 'w': |
80 | status = 1; | |
81 | break; | |
2c308875 | 82 | |
cbfa3253 | 83 | case 'h': |
6e1eda6f | 84 | usage(); |
2c308875 KZ |
85 | case 'V': |
86 | print_version(EXIT_SUCCESS); | |
cbfa3253 | 87 | default: |
677ec86c | 88 | errtryhelp(EXIT_FAILURE); |
cbfa3253 SK |
89 | } |
90 | ||
6e1eda6f RM |
91 | if (argc - optind < 1) { |
92 | warnx(_("no command specified")); | |
93 | errtryhelp(EXIT_FAILURE); | |
94 | } | |
cbfa3253 | 95 | |
18017621 | 96 | if (forcefork || getpgrp() == getpid()) { |
0dde1997 DKG |
97 | pid = fork(); |
98 | switch (pid) { | |
c07ebfa1 | 99 | case -1: |
cbfa3253 SK |
100 | err(EXIT_FAILURE, _("fork")); |
101 | case 0: | |
102 | /* child */ | |
c07ebfa1 | 103 | break; |
cbfa3253 SK |
104 | default: |
105 | /* parent */ | |
0dde1997 DKG |
106 | if (!status) |
107 | return EXIT_SUCCESS; | |
108 | if (wait(&status) != pid) | |
109 | err(EXIT_FAILURE, "wait"); | |
110 | if (WIFEXITED(status)) | |
111 | return WEXITSTATUS(status); | |
112 | err(status, _("child %d did not exit normally"), pid); | |
c07ebfa1 KZ |
113 | } |
114 | } | |
cbfa3253 SK |
115 | if (setsid() < 0) |
116 | /* cannot happen */ | |
117 | err(EXIT_FAILURE, _("setsid failed")); | |
118 | ||
74ce680a SK |
119 | if (ctty && ioctl(STDIN_FILENO, TIOCSCTTY, 1)) |
120 | err(EXIT_FAILURE, _("failed to set the controlling terminal")); | |
b4479ffa | 121 | execvp(argv[optind], argv + optind); |
fd777151 | 122 | errexec(argv[optind]); |
6dbe3af9 | 123 | } |