Added support for the systemd watchdog

CONTRIBUTORS

@@ -3233,6 +3233,7 @@ Malte Forkel <malte.forkel@berlin.de>
 
 Marc Perrudin <vdr@ekass.net>
  for translating OSD texts to the French language
+ for adding support for the systemd watchdog
 
 Bernard Jaulin <bernard.jaulin@gmail.com>
  for translating OSD texts to the French language

HISTORY

@@ -8878,3 +8878,4 @@ Video Disk Recorder Revision History
   Lars Hanisch).
 - Avoiding some duplicate code and unnecessary work in nit.c (thanks to Ville
   Skytt<74>).
+- Added support for the systemd watchdog (thanks to Marc Perrudin),

vdr.c

@@ -22,7 +22,7 @@
  *
  * The project's page is at http://www.tvdr.de
  *
- * $Id: vdr.c 4.8 2016/12/13 13:13:10 kls Exp $
+ * $Id: vdr.c 4.9 2016/12/23 14:34:37 kls Exp $
  */
 
 #include <getopt.h>
@@ -171,6 +171,9 @@ static void Watchdog(int signum)
   // Something terrible must have happened that prevented the 'alarm()' from
   // being called in time, so let's get out of here:
   esyslog("PANIC: watchdog timer expired - exiting!");
+#ifdef SDNOTIFY
+  sd_notify(0, "STOPPING=1\nSTATUS=PANIC");
+#endif
   exit(1);
 }
 
@@ -235,6 +238,10 @@ int main(int argc, char *argv[])
 #if defined(VDR_USER)
   VdrUser = VDR_USER;
 #endif
+#ifdef SDNOTIFY
+  time_t SdWatchdog;
+  int SdWatchdogTimeout = 0;
+#endif
 
   cArgs *Args = NULL;
   if (argc == 1) {
@@ -914,6 +921,16 @@ int main(int argc, char *argv[])
      }
 
 #ifdef SDNOTIFY
+  if (sd_watchdog_enabled(0, NULL) > 0) {
+     uint64_t timeout;
+     SdWatchdog = time(NULL);
+     sd_watchdog_enabled(0, &timeout);
+     SdWatchdogTimeout = (int)timeout/1000000;
+     dsyslog("SD_WATCHDOG enabled with timeout set to %d seconds", SdWatchdogTimeout);
+     }
+
+  // Startup notification:
+
   sd_notify(0, "READY=1\nSTATUS=Ready");
 #endif
 
@@ -976,6 +993,14 @@ int main(int argc, char *argv[])
               dsyslog("max. latency time %d seconds", MaxLatencyTime);
               }
            }
+#ifdef SDNOTIFY
+        // Ping systemd watchdog when half the timeout is elapsed:
+        if (SdWatchdogTimeout && (Now - SdWatchdog) * 2 > SdWatchdogTimeout) {
+           sd_notify(0, "WATCHDOG=1");
+           SdWatchdog = Now;
+           dsyslog("SD_WATCHDOG ping");
+           }
+#endif
         // Handle channel and timer modifications:
         {
           // Channels and timers need to be stored in a consistent manner,
@@ -1565,5 +1590,11 @@ Exit:
      closelog();
   if (HasStdin)
      tcsetattr(STDIN_FILENO, TCSANOW, &savedTm);
+#ifdef SDNOTIFY
+  if (ShutdownHandler.GetExitCode() == 2)
+     sd_notify(0, "STOPPING=1\nSTATUS=Startup failed, exiting");
+  else
+     sd_notify(0, "STOPPING=1\nSTATUS=Exiting");
+#endif
   return ShutdownHandler.GetExitCode();
 }