128 lines
3.9 KiB
C
128 lines
3.9 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* COPYING NOTES
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*
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* timeout.c -- a timeout handler for shell commands
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*
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* Copyright (C) 2005-6, Roberto A. Foglietta <me@roberto.foglietta.name>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
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*/
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* REVISION NOTES:
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* released 17-11-2005 by Roberto A. Foglietta
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* talarm 04-12-2005 by Roberto A. Foglietta
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* modified 05-12-2005 by Roberto A. Foglietta
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* sizerdct 06-12-2005 by Roberto A. Foglietta
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* splitszf 12-05-2006 by Roberto A. Foglietta
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* rewrite 14-11-2008 vda
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*/
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//config:config TIMEOUT
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//config: bool "timeout (5.5 kb)"
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//config: default y
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//config: help
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//config: Runs a program and watches it. If it does not terminate in
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//config: specified number of seconds, it is sent a signal.
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//applet:IF_TIMEOUT(APPLET(timeout, BB_DIR_USR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_TIMEOUT) += timeout.o
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//usage:#define timeout_trivial_usage
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//usage: "[-t SECS] [-s SIG] PROG ARGS"
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//usage:#define timeout_full_usage "\n\n"
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//usage: "Runs PROG. Sends SIG to it if it is not gone in SECS seconds.\n"
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//usage: "Defaults: SECS: 10, SIG: TERM."
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#include "libbb.h"
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int timeout_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int timeout_main(int argc UNUSED_PARAM, char **argv)
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{
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int signo;
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int status;
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int parent = 0;
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int timeout = 10;
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pid_t pid;
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#if !BB_MMU
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char *sv1, *sv2;
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#endif
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const char *opt_s = "TERM";
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/* -p option is not documented, it is needed to support NOMMU. */
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/* -t SECONDS; -p PARENT_PID */
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/* '+': stop at first non-option */
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getopt32(argv, "+s:t:+" USE_FOR_NOMMU("p:+"), &opt_s, &timeout, &parent);
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/*argv += optind; - no, wait for bb_daemonize_or_rexec! */
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signo = get_signum(opt_s);
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if (signo < 0)
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bb_error_msg_and_die("unknown signal '%s'", opt_s);
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/* We want to create a grandchild which will watch
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* and kill the grandparent. Other methods:
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* making parent watch child disrupts parent<->child link
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* (example: "tcpsvd 0.0.0.0 1234 timeout service_prog" -
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* it's better if service_prog is a child of tcpsvd!),
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* making child watch parent results in programs having
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* unexpected children. */
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if (parent) /* we were re-execed, already grandchild */
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goto grandchild;
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if (!argv[optind]) /* no PROG? */
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bb_show_usage();
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#if !BB_MMU
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sv1 = argv[optind];
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sv2 = argv[optind + 1];
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#endif
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pid = xvfork();
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if (pid == 0) {
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/* Child: spawn grandchild and exit */
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parent = getppid();
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#if !BB_MMU
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argv[optind] = xasprintf("-p%u", parent);
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argv[optind + 1] = NULL;
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#endif
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/* NB: exits with nonzero on error: */
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bb_daemonize_or_rexec(0, argv);
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/* Here we are grandchild. Sleep, then kill grandparent */
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grandchild:
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/* Just sleep(HUGE_NUM); kill(parent) may kill wrong process! */
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while (1) {
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sleep(1);
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if (--timeout <= 0)
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break;
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if (kill(parent, 0)) {
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/* process is gone */
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return EXIT_SUCCESS;
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}
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}
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kill(parent, signo);
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return EXIT_SUCCESS;
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}
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/* Parent */
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wait(&status); /* wait for child to die */
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/* Did intermediate [v]fork or exec fail? */
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if (!WIFEXITED(status) || WEXITSTATUS(status) != 0)
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return EXIT_FAILURE;
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/* Ok, exec a program as requested */
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argv += optind;
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#if !BB_MMU
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argv[0] = sv1;
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argv[1] = sv2;
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#endif
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BB_EXECVP_or_die(argv);
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}
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