use SO_KEEPALIVE option on all sockets do detect dead sockets

CONTRIBUTORS

@@ -100,6 +100,9 @@ Jori Hamalainen
   for extensive testing while making stream compatible to Network Media Tank
   for adding Network Media Tank browser support to HTML pages
 
+owagner
+  for suggesting use of SO_KEEPALIVE socket option to detect dead sockets
+
 Joachim K<>nig-Baltes
   for fixing Min/MaxPriority parsing
 

HISTORY

@@ -1,6 +1,8 @@
 VDR Plugin 'streamdev' Revision History
 ---------------------------------------
 
+- use SO_KEEPALIVE option on all sockets do detect dead sockets (thanks to
+  owagner)
 - enable PatFilter for externremux, so VLC can be used as remuxer or client
 - fixed insecure format strings in LSTX handlers (thanks to Anssi Hannula)
 - updated Finish translation (thanks to Rolf Ahrenberg)

tools/socket.c

@@ -124,6 +124,10 @@ bool cTBSocket::Accept(const cTBSocket &Listener) {
 	if (::getsockname(socket, (struct sockaddr*)&m_LocalAddr, &addrlen) == -1)
 		return false;
 	
+	int sol=1;
+	// Ignore possible errors here, proceed as usual
+	::setsockopt(socket, SOL_SOCKET, SO_KEEPALIVE, &sol, sizeof(sol)); 
+
 	if (!cTBSource::Open(socket))
 		return false;