Added periodic calls to malloc_trim(0) to reduce memory consumption

CONTRIBUTORS

@@ -3625,6 +3625,7 @@ Onur Sent
  for fixing handling the S2SatelliteDeliverySystemDescriptor for transponders broadcasting
  in "backwards compatibility mode" according to ETSI EN 300 468
  for pointing out some potentially mistakable code in cSectionHandler::SetStatus()
+ for adding periodic calls to malloc_trim(0) to reduce memory consumption
 
 Helmut Binder <cco@aon.at>
  for improving calculating signal strength and quality

HISTORY

@@ -9780,7 +9780,7 @@ Video Disk Recorder Revision History
   out by Onur Sentürk).
 - Official release.
 
-2022-11-23:
+2022-11-28:
 
 - Added UPDATE-2.6.0, which was missing in the official 2.6.0 release.
 - Fixed unexpected calls of the '-r' script when a recording is interrupted and
@@ -9809,3 +9809,5 @@ Video Disk Recorder Revision History
 - Added support for kernel based LIRC driver (thanks to Marko Mäkelä). Use the
   command line option '--lirc=/dev/lirc0' to use this. Requires kernel version 5.10
   or above.
+- Added periodic calls to malloc_trim(0) to reduce memory consumption (thanks to
+  Onur Sentürk).

vdr.c

@@ -22,13 +22,14 @@
  *
  * The project's page is at http://www.tvdr.de
  *
- * $Id: vdr.c 5.9 2022/11/26 13:37:06 kls Exp $
+ * $Id: vdr.c 5.10 2022/11/28 10:44:01 kls Exp $
  */
 
 #include <getopt.h>
 #include <grp.h>
 #include <langinfo.h>
 #include <locale.h>
+#include <malloc.h>
 #include <pwd.h>
 #include <signal.h>
 #include <stdlib.h>
@@ -74,6 +75,7 @@
 
 #define MINCHANNELWAIT        10 // seconds to wait between failed channel switchings
 #define ACTIVITYTIMEOUT       60 // seconds before starting housekeeping
+#define MEMCLEANUPDELTA     3600 // seconds between memory cleanups
 #define SHUTDOWNWAIT         300 // seconds to wait in user prompt before automatic shutdown
 #define SHUTDOWNRETRY        360 // seconds before trying again to shut down
 #define SHUTDOWNFORCEPROMPT    5 // seconds to wait in user prompt to allow forcing shutdown
@@ -1578,6 +1580,12 @@ int main(int argc, char *argv[])
               cSchedules::Cleanup();
               // Plugins housekeeping:
               PluginManager.Housekeeping();
+              // Memory cleanup:
+              static time_t LastMemoryCleanup = 0;
+              if ((Now - LastMemoryCleanup) > MEMCLEANUPDELTA) {
+                 malloc_trim(0);
+                 LastMemoryCleanup = Now;
+                 }
               }
            }