Fix kdm logfile growing rapidly under certain conditions

(cherry picked from commit 696fe6318f)

kdm/kfrontend/kgapp.cpp

@@ -196,10 +196,11 @@ kg_main( const char *argv0 )
 	if (trinity_desktop_lock_use_sak) {
 		tsak = new KProcess;
 		*tsak << TQCString( argv0, strrchr( argv0, '/' ) - argv0 + 2 ) + "tsak";
-		tsak->start(KProcess::Block);
+		tsak->start(KProcess::Block, KProcess::AllOutput);
 	}
 	if (tsak) {
 		tsak->closeStdin();
+		tsak->closeStdout();
 		tsak->detach();
 		delete tsak;
 	}

tsak/main.cpp

@@ -357,6 +357,9 @@ int main (int argc, char *argv[])
 	int current_keyboard;
 	bool can_proceed;
 
+	// Ignore SIGPIPE
+	signal(SIGPIPE, SIG_IGN);
+
 	for (i=0; i<MAX_KEYBOARDS; i++) {
 		child_pids[i] = 0;
 	}