Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 1 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
| 2 | * COPYING NOTES |
| 3 | * |
| 4 | * timeout.c -- a timeout handler for shell commands |
| 5 | * |
| 6 | * Copyright (C) 2005-6, Roberto A. Foglietta <me@roberto.foglietta.name> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; version 2 of the License. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
| 20 | */ |
| 21 | /* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * |
| 22 | * REVISION NOTES: |
| 23 | * released 17-11-2005 by Roberto A. Foglietta |
| 24 | * talarm 04-12-2005 by Roberto A. Foglietta |
| 25 | * modified 05-12-2005 by Roberto A. Foglietta |
| 26 | * sizerdct 06-12-2005 by Roberto A. Foglietta |
| 27 | * splitszf 12-05-2006 by Roberto A. Foglietta |
| 28 | * rewrite 14-11-2008 vda |
| 29 | */ |
| 30 | |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 31 | //usage:#define timeout_trivial_usage |
| 32 | //usage: "[-t SECS] [-s SIG] PROG ARGS" |
| 33 | //usage:#define timeout_full_usage "\n\n" |
| 34 | //usage: "Runs PROG. Sends SIG to it if it is not gone in SECS seconds.\n" |
| 35 | //usage: "Defaults: SECS: 10, SIG: TERM." |
| 36 | |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 37 | #include "libbb.h" |
| 38 | |
| 39 | int timeout_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 40 | int timeout_main(int argc UNUSED_PARAM, char **argv) |
| 41 | { |
| 42 | int signo; |
| 43 | int status; |
| 44 | int parent = 0; |
| 45 | int timeout = 10; |
| 46 | pid_t pid; |
| 47 | #if !BB_MMU |
| 48 | char *sv1, *sv2; |
| 49 | #endif |
| 50 | const char *opt_s = "TERM"; |
| 51 | |
| 52 | /* -p option is not documented, it is needed to support NOMMU. */ |
| 53 | |
| 54 | /* -t SECONDS; -p PARENT_PID */ |
Denis Vlasenko | 8a2f6bf | 2008-11-24 22:34:47 +0000 | [diff] [blame] | 55 | /* '+': stop at first non-option */ |
Denys Vlasenko | 237bedd | 2016-07-06 21:58:02 +0200 | [diff] [blame^] | 56 | getopt32(argv, "+s:t:+" USE_FOR_NOMMU("p:+"), &opt_s, &timeout, &parent); |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 57 | /*argv += optind; - no, wait for bb_daemonize_or_rexec! */ |
| 58 | signo = get_signum(opt_s); |
| 59 | if (signo < 0) |
| 60 | bb_error_msg_and_die("unknown signal '%s'", opt_s); |
| 61 | |
| 62 | /* We want to create a grandchild which will watch |
| 63 | * and kill the grandparent. Other methods: |
| 64 | * making parent watch child disrupts parent<->child link |
| 65 | * (example: "tcpsvd 0.0.0.0 1234 timeout service_prog" - |
| 66 | * it's better if service_prog is a child of tcpsvd!), |
| 67 | * making child watch parent results in programs having |
| 68 | * unexpected children. */ |
| 69 | |
| 70 | if (parent) /* we were re-execed, already grandchild */ |
| 71 | goto grandchild; |
| 72 | if (!argv[optind]) /* no PROG? */ |
| 73 | bb_show_usage(); |
| 74 | |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 75 | #if !BB_MMU |
| 76 | sv1 = argv[optind]; |
| 77 | sv2 = argv[optind + 1]; |
| 78 | #endif |
Pascal Bellard | 926031b | 2010-07-04 15:32:38 +0200 | [diff] [blame] | 79 | pid = xvfork(); |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 80 | if (pid == 0) { |
| 81 | /* Child: spawn grandchild and exit */ |
| 82 | parent = getppid(); |
| 83 | #if !BB_MMU |
| 84 | argv[optind] = xasprintf("-p%u", parent); |
| 85 | argv[optind + 1] = NULL; |
| 86 | #endif |
| 87 | /* NB: exits with nonzero on error: */ |
| 88 | bb_daemonize_or_rexec(0, argv); |
| 89 | /* Here we are grandchild. Sleep, then kill grandparent */ |
| 90 | grandchild: |
Denys Vlasenko | 099e528 | 2011-02-02 00:59:35 +0100 | [diff] [blame] | 91 | /* Just sleep(HUGE_NUM); kill(parent) may kill wrong process! */ |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 92 | while (1) { |
| 93 | sleep(1); |
| 94 | if (--timeout <= 0) |
| 95 | break; |
| 96 | if (kill(parent, 0)) { |
| 97 | /* process is gone */ |
| 98 | return EXIT_SUCCESS; |
| 99 | } |
| 100 | } |
| 101 | kill(parent, signo); |
| 102 | return EXIT_SUCCESS; |
| 103 | } |
| 104 | |
| 105 | /* Parent */ |
| 106 | wait(&status); /* wait for child to die */ |
| 107 | /* Did intermediate [v]fork or exec fail? */ |
| 108 | if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) |
| 109 | return EXIT_FAILURE; |
| 110 | /* Ok, exec a program as requested */ |
| 111 | argv += optind; |
| 112 | #if !BB_MMU |
| 113 | argv[0] = sv1; |
| 114 | argv[1] = sv2; |
| 115 | #endif |
Pascal Bellard | 21e8e8d | 2010-07-04 00:57:03 +0200 | [diff] [blame] | 116 | BB_EXECVP_or_die(argv); |
Denis Vlasenko | a9acbe6 | 2008-11-24 13:25:20 +0000 | [diff] [blame] | 117 | } |