diff options
Diffstat (limited to 'miscutils')
| -rw-r--r-- | miscutils/Config.in | 7 | ||||
| -rw-r--r-- | miscutils/Kbuild | 1 | ||||
| -rw-r--r-- | miscutils/timeout.c | 228 |
3 files changed, 236 insertions, 0 deletions
diff --git a/miscutils/Config.in b/miscutils/Config.in index fc7333bb6..68732e682 100644 --- a/miscutils/Config.in +++ b/miscutils/Config.in @@ -529,6 +529,13 @@ config TIME When the command finishes, time writes a message to standard output giving timing statistics about this program run. +config TIMEOUT + bool "timeout" + default n + help + Runs a program and watches it. If it does not terminate in + specified number of seconds, it is sent a signal. + config TTYSIZE bool "ttysize" default n diff --git a/miscutils/Kbuild b/miscutils/Kbuild index 13791ef18..e6e434755 100644 --- a/miscutils/Kbuild +++ b/miscutils/Kbuild @@ -34,5 +34,6 @@ lib-$(CONFIG_SETSID) += setsid.o lib-$(CONFIG_STRINGS) += strings.o lib-$(CONFIG_TASKSET) += taskset.o lib-$(CONFIG_TIME) += time.o +lib-$(CONFIG_TIMEOUT) += timeout.o lib-$(CONFIG_TTYSIZE) += ttysize.o lib-$(CONFIG_WATCHDOG) += watchdog.o diff --git a/miscutils/timeout.c b/miscutils/timeout.c new file mode 100644 index 000000000..6a0a9a6e6 --- /dev/null +++ b/miscutils/timeout.c @@ -0,0 +1,228 @@ +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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 + */ + +#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 */ + opt_complementary = "t+" USE_FOR_NOMMU(":p+"); + 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(); + + pid = vfork(); + if (pid < 0) + bb_perror_msg_and_die("vfork"); +#if !BB_MMU + sv1 = argv[optind]; + sv2 = argv[optind + 1]; +#endif + 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(NUGE_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(argv[0], argv); + bb_perror_msg_and_die("exec '%s'", argv[0]); +} +/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * + * 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 + */ + +#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 */ + opt_complementary = "t+" USE_FOR_NOMMU(":p+"); + 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(); + + pid = vfork(); + if (pid < 0) + bb_perror_msg_and_die("vfork"); +#if !BB_MMU + sv1 = argv[optind]; + sv2 = argv[optind + 1]; +#endif + 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(NUGE_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(argv[0], argv); + bb_perror_msg_and_die("exec '%s'", argv[0]); +} |