Update monet.

tools/android/adb_reboot/adb_reboot.c

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <unistd.h>
+
+int main(int argc, char ** argv) {
+  int i = fork();
+  struct stat ft;
+  time_t ct;
+
+  if (i < 0) {
+    printf("fork error");
+    return 1;
+  }
+  if (i > 0)
+    return 0;
+
+  /* child (daemon) continues */
+  int j;
+  for (j = 0; j < sysconf(_SC_OPEN_MAX); j++)
+    close(j);
+
+  setsid(); /* obtain a new process group */
+
+  while (1) {
+    sleep(120);
+
+    stat("/sdcard/host_heartbeat", &ft);
+    time(&ct);
+    if (ct - ft.st_mtime  > 120) {
+      /* File was not touched for some time. */
+      system("su -c reboot");
+    }
+  }
+
+  return 0;
+}