Now avoiding calling poll() in cSectionHandler::Action() if there are no filters

CONTRIBUTORS

@@ -2204,6 +2204,8 @@ Marko M
  for adding support for kernel based LIRC driver
  for reporting a possible heap-use-after-free in cDvbTuner::Action()
  for reporting a flaw in initializing cDvbPlayerControl and cTransferControl
+ for reporting a possible call to poll() in cSectionHandler::Action() without any
+ filters
 
 Patrick Rother <krd-vdr@gulu.net>
  for reporting a bug in defining timers that only differ in the day of week

HISTORY

@@ -9816,7 +9816,7 @@ Video Disk Recorder Revision History
 - Added missing rounding when dividing frequencies in processing the NIT (thanks to
   Winfried Köhler).
 
-2022-12-05:
+2022-12-06:
 
 - Fixed a compiler warning.
 - Fixed generating the index file in the cutter (reported by Christoph Haubrich).
@@ -9824,3 +9824,5 @@ Video Disk Recorder Revision History
 - Added code for the 'qks' audio track (thanks to Johann Friedrichs).
 - Fixed a possible heap-use-after-free in cDvbTuner::Action() (reported by Marko Mäkelä).
 - Fixed initializing cDvbPlayerControl and cTransferControl (reported by Marko Mäkelä).
+- Now avoiding calling poll() in cSectionHandler::Action() if there are no filters
+  (reported by Marko Mäkelä).

sections.c

@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: sections.c 5.3 2022/01/31 21:21:42 kls Exp $
+ * $Id: sections.c 5.4 2022/12/06 12:25:08 kls Exp $
  */
 
 #include "sections.h"
@@ -180,6 +180,11 @@ void cSectionHandler::Action(void)
            startFilters = false;
            }
         int NumFilters = filterHandles.Count();
+        if (NumFilters == 0) {
+           Unlock();
+           cCondWait::SleepMs(100);
+           continue;
+           }
         pollfd pfd[NumFilters];
         for (cFilterHandle *fh = filterHandles.First(); fh; fh = filterHandles.Next(fh)) {
             int i = fh->Index();