[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit

Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/miscutils/watchdog.c b/ap/app/busybox/src/miscutils/watchdog.c
new file mode 100644
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--- /dev/null
+++ b/ap/app/busybox/src/miscutils/watchdog.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * Mini watchdog implementation for busybox
+ *
+ * Copyright (C) 2003  Paul Mundt <lethal@linux-sh.org>
+ * Copyright (C) 2006  Bernhard Reutner-Fischer <busybox@busybox.net>
+ * Copyright (C) 2008  Darius Augulis <augulis.darius@gmail.com>
+ *
+ * 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"
+
+#define OPT_FOREGROUND  (1 << 0)
+#define OPT_STIMER      (1 << 1)
+#define OPT_HTIMER      (1 << 2)
+
+static void watchdog_shutdown(int sig UNUSED_PARAM)
+{
+	static const char V = 'V';
+
+	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);
+}
+
+static void watchdog_safe_terminate(int unused UNUSED_PARAM) NORETURN;
+static void watchdog_safe_terminate(int unused UNUSED_PARAM)
+{
+	write(3, "T", 1);	/* Magic safe terminate (ie, a longer timeout) */
+	close(3);
+	exit(0);
+}
+
+int watchdog_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int watchdog_main(int argc, char **argv)
+{
+	static const struct suffix_mult suffixes[] = {
+		{ "ms", 1 },
+		{ "", 1000 },
+		{ "", 0 }
+	};
+
+	unsigned opts;
+	unsigned stimer_duration; /* how often to restart */
+	unsigned htimer_duration = 60000; /* reboots after N ms if not restarted */
+	char *st_arg;
+	char *ht_arg;
+	int fd;
+
+	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;
+	if (opts & OPT_STIMER)
+		stimer_duration = xatou_sfx(st_arg, suffixes);
+
+	fd = open("/proc/self/oom_score_adj", O_WRONLY);
+	if (fd >= 0) {
+		write(fd, "-1000", 5);
+		close(fd);
+	} else {
+		fd = open("/proc/self/oom_adj", O_WRONLY);
+		if (fd >= 0) {
+			write(fd, "-17", 3);
+			close(fd);
+		}
+	}
+
+	signal(SIGHUP, watchdog_shutdown);
+	signal(SIGINT, watchdog_shutdown);
+	signal(SIGTERM, watchdog_safe_terminate);
+	//bb_signals(BB_FATAL_SIGS, watchdog_shutdown);
+
+	/* Use known fd # - avoid needing global 'int fd' */
+	xmove_fd(xopen(argv[argc - 1], O_WRONLY), 3);
+
+	/* WDIOC_SETTIMEOUT takes seconds, not milliseconds */
+	htimer_duration = htimer_duration / 1000;
+#ifndef WDIOC_SETTIMEOUT
+# error WDIOC_SETTIMEOUT is not defined, cannot compile watchdog applet
+#else
+# if defined WDIOC_SETOPTIONS && defined WDIOS_ENABLECARD
+	{
+		static const int enable = WDIOS_ENABLECARD;
+		ioctl_or_warn(3, WDIOC_SETOPTIONS, (void*) &enable);
+	}
+# endif
+	ioctl_or_warn(3, WDIOC_SETTIMEOUT, &htimer_duration);
+#endif
+
+#if 0
+	ioctl_or_warn(3, WDIOC_GETTIMEOUT, &htimer_duration);
+	printf("watchdog: SW timer is %dms, HW timer is %ds\n",
+		stimer_duration, htimer_duration * 1000);
+#endif
+
+	write_pidfile(CONFIG_PID_FILE_PATH "/watchdog.pid");
+
+	while (1) {
+		/*
+		 * Make sure we clear the counter before sleeping,
+		 * as the counter value is undefined at this point -- PFM
+		 */
+		write(3, "", 1); /* write zero byte */
+		usleep(stimer_duration * 1000L);
+	}
+	return EXIT_SUCCESS; /* - not reached, but gcc 4.2.1 is too dumb! */
+}