1 files changed, 81 insertions, 0 deletions
diff --git a/busybox/miscutils/watchdog.c b/busybox/miscutils/watchdog.c
new file mode 100644
index 0000000..276fade
--- /dev/null
+++ b/busybox/miscutils/watchdog.c
@@ -0,0 +1,81 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini watchdog implementation for busybox
+ *
+ * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
+ *
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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
+ *
+ */
+
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <signal.h>
+#include "busybox.h"
+
+/* Userspace timer duration, in seconds */
+static unsigned int timer_duration = 30;
+
+/* Watchdog file descriptor */
+static int fd;
+
+static void watchdog_shutdown(int unused)
+{
+	write(fd, "V", 1);	/* Magic */
+	close(fd);
+	exit(0);
+}
+
+extern int watchdog_main(int argc, char **argv)
+{
+	int opt;
+
+	while ((opt = getopt(argc, argv, "t:")) > 0) {
+		switch (opt) {
+			case 't':
+				timer_duration = bb_xgetlarg(optarg, 10, 0, INT_MAX);
+				break;
+			default:
+				bb_show_usage();
+		}
+	}
+
+	/* We're only interested in the watchdog device .. */
+	if (optind < argc - 1 || argc == 1)
+		bb_show_usage();
+
+	if (daemon(0, 1) < 0)
+		bb_perror_msg_and_die("Failed forking watchdog daemon");
+
+	signal(SIGHUP, watchdog_shutdown);
+	signal(SIGINT, watchdog_shutdown);
+
+	fd = bb_xopen(argv[argc - 1], O_WRONLY);
+
+	while (1) {
+		/*
+		 * Make sure we clear the counter before sleeping, as the counter value
+		 * is undefined at this point -- PFM
+		 */
+		write(fd, "\0", 1);
+		sleep(timer_duration);
+	}
+
+	watchdog_shutdown(0);
+
+	return EXIT_SUCCESS;
+}