timeout: new applet. 370 bytes. by Roberto Foglietta.

3 files changed, 236 insertions, 0 deletions

diff --git a/miscutils/Config.in b/miscutils/Config.in
index fc7333b..68732e6 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 13791ef..e6e4347 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 0000000..6a0a9a6
--- /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]);
+}