summaryrefslogtreecommitdiff
path: root/i/pc104/initrd/conf/busybox/miscutils/watchdog.c
diff options
context:
space:
mode:
Diffstat (limited to 'i/pc104/initrd/conf/busybox/miscutils/watchdog.c')
-rw-r--r--i/pc104/initrd/conf/busybox/miscutils/watchdog.c66
1 files changed, 66 insertions, 0 deletions
diff --git a/i/pc104/initrd/conf/busybox/miscutils/watchdog.c b/i/pc104/initrd/conf/busybox/miscutils/watchdog.c
new file mode 100644
index 0000000..ed9026d
--- /dev/null
+++ b/i/pc104/initrd/conf/busybox/miscutils/watchdog.c
@@ -0,0 +1,66 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini watchdog implementation for busybox
+ *
+ * Copyright (C) 2003 Paul Mundt <lethal@linux-sh.org>
+ * Copyright (C) 2006 Bernhard Fischer <busybox@busybox.net>
+ *
+ * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
+ */
+
+#include "busybox.h"
+
+#define OPT_FOREGROUND 0x01
+#define OPT_TIMER 0x02
+
+static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig) ATTRIBUTE_NORETURN;
+static void watchdog_shutdown(int ATTRIBUTE_UNUSED sig)
+{
+ write(3, "V", 1); /* Magic, see watchdog-api.txt in kernel */
+ if (ENABLE_FEATURE_CLEAN_UP)
+ close(3);
+ exit(0);
+}
+
+int watchdog_main(int argc, char **argv);
+int watchdog_main(int argc, char **argv)
+{
+ unsigned opts;
+ unsigned timer_duration = 30; /* Userspace timer duration, in seconds */
+ char *t_arg;
+
+ opts = getopt32(argc, argv, "Ft:", &t_arg);
+
+ if (opts & OPT_TIMER)
+ timer_duration = xatou(t_arg);
+
+ /* We're only interested in the watchdog device .. */
+ if (optind < argc - 1 || argc == 1)
+ bb_show_usage();
+
+#ifdef BB_NOMMU
+ if (!(opts & OPT_FOREGROUND))
+ vfork_daemon_rexec(0, 1, argc, argv, "-F");
+#else
+ xdaemon(0, 1);
+#endif
+
+ signal(SIGHUP, watchdog_shutdown);
+ signal(SIGINT, watchdog_shutdown);
+
+ /* Use known fd # - avoid needing global 'int fd' */
+ dup2(xopen(argv[argc - 1], O_WRONLY), 3);
+
+ while (1) {
+ /*
+ * Make sure we clear the counter before sleeping, as the counter value
+ * is undefined at this point -- PFM
+ */
+ write(3, "", 1);
+ sleep(timer_duration);
+ }
+
+ watchdog_shutdown(0);
+
+ /* return EXIT_SUCCESS; */
+}