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