* Copyright (C) 2006 Bernhard Reutner-Fischer <busybox@busybox.net>
* Copyright (C) 2008 Darius Augulis <augulis.darius@gmail.com>
*
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//usage:#define watchdog_trivial_usage
+//usage: "[-t N[ms]] [-T N[ms]] [-F] DEV"
+//usage:#define watchdog_full_usage "\n\n"
+//usage: "Periodically write to watchdog device DEV\n"
+//usage: "\n -T N Reboot after N seconds if not reset (default 60)"
+//usage: "\n -t N Reset every N seconds (default 30)"
+//usage: "\n -F Run in foreground"
+//usage: "\n"
+//usage: "\nUse 500ms to specify period in milliseconds"
+
#include "libbb.h"
#include "linux/types.h" /* for __u32 */
#include "linux/watchdog.h"
{
static const char V = 'V';
- write(3, &V, 1); /* Magic, see watchdog-api.txt in kernel */
+ remove_pidfile(CONFIG_PID_FILE_PATH "/watchdog.pid");
+ write(3, &V, 1); /* Magic, see watchdog-api.txt in kernel */
if (ENABLE_FEATURE_CLEAN_UP)
close(3);
- exit(EXIT_SUCCESS);
+ _exit(EXIT_SUCCESS);
}
int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
static const struct suffix_mult suffixes[] = {
{ "ms", 1 },
{ "", 1000 },
- { }
+ { "", 0 }
};
unsigned opts;
opt_complementary = "=1"; /* must have exactly 1 argument */
opts = getopt32(argv, "Ft:T:", &st_arg, &ht_arg);
+ /* We need to daemonize *before* opening the watchdog as many drivers
+ * will only allow one process at a time to do so. Since daemonizing
+ * is not perfect (child may run before parent finishes exiting), we
+ * can't rely on parent exiting before us (let alone *cleanly* releasing
+ * the watchdog fd -- something else that may not even be allowed).
+ */
+ if (!(opts & OPT_FOREGROUND))
+ bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
+
if (opts & OPT_HTIMER)
htimer_duration = xatou_sfx(ht_arg, suffixes);
stimer_duration = htimer_duration / 2;
stimer_duration, htimer_duration * 1000);
#endif
- if (!(opts & OPT_FOREGROUND)) {
- bb_daemonize_or_rexec(DAEMON_CHDIR_ROOT, argv);
- }
+ write_pidfile(CONFIG_PID_FILE_PATH "/watchdog.pid");
while (1) {
/*