fix #374: when terminate srs, cleanup to ensure FFMPEG quit.

@@ -403,6 +403,10 @@ int SrsFFMPEG::start()
     
     // child process: ffmpeg encoder engine.
     if (pid == 0) {
+        // ignore the SIGINT and SIGTERM
+        signal(SIGINT, SIG_IGN);
+        signal(SIGTERM, SIG_IGN);
+        
         // redirect logs to file.
         int log_fd = -1;
         int flags = O_CREAT|O_WRONLY|O_APPEND;

@@ -159,6 +159,11 @@ int SrsIngester::parse_engines(SrsConfDirective* vhost, SrsConfDirective* ingest
     return ret;
 }
 
+void SrsIngester::dispose()
+{
+    stop();
+}
+
 void SrsIngester::stop()
 {
     pthread->stop();

@@ -70,6 +70,8 @@ public:
     SrsIngester();
     virtual ~SrsIngester();
 public:
+    virtual void dispose();
+public:
     virtual int start();
     virtual void stop();
 // interface ISrsReusableThreadHandler.

@@ -480,6 +480,7 @@ SrsServer::SrsServer()
 {
     signal_reload = false;
     signal_gmc_stop = false;
+    signal_gracefully_quit = false;
     pid_fd = -1;
     
     signal_manager = NULL;
@@ -519,7 +520,7 @@ void SrsServer::destroy()
     close_listeners(SrsListenerHttpStream);
 
 #ifdef SRS_AUTO_INGEST
-    ingester->stop();
+    ingester->dispose();
 #endif
     
 #ifdef SRS_AUTO_HTTP_API
@@ -555,6 +556,18 @@ void SrsServer::destroy()
     // and segment fault.
 }
 
+void SrsServer::dispose()
+{
+    _srs_config->unsubscribe(this);
+    
+#ifdef SRS_AUTO_INGEST
+    ingester->dispose();
+    srs_trace("gracefully cleanup ingesters");
+#endif
+    
+    srs_trace("terminate server");
+}
+
 int SrsServer::initialize(ISrsServerCycle* cycle_handler)
 {
     int ret = ERROR_SUCCESS;
@@ -831,6 +844,7 @@ int SrsServer::cycle()
     srs_warn("system quit");
 #else
     srs_warn("main cycle terminated, system quit normally.");
+    dispose();
     exit(0);
 #endif
     
@@ -877,9 +891,9 @@ void SrsServer::on_signal(int signo)
         return;
     }
     
-    if (signo == SIGTERM) {
-        srs_trace("user terminate program");
-        exit(0);
+    if (signo == SIGTERM && !signal_gracefully_quit) {
+        srs_trace("user terminate program, gracefully quit.");
+        signal_gracefully_quit = true;
         return;
     }
 }
@@ -903,7 +917,7 @@ int SrsServer::do_cycle()
     
     // the deamon thread, update the time cache
     while (true) {
-        if(handler && (ret = handler->on_cycle(conns.size())) != ERROR_SUCCESS){
+        if(handler && (ret = handler->on_cycle((int)conns.size())) != ERROR_SUCCESS){
             srs_error("cycle handle failed. ret=%d", ret);
             return ret;
         }
@@ -917,12 +931,18 @@ int SrsServer::do_cycle()
         
         for (int i = 0; i < temp_max; i++) {
             st_usleep(SRS_SYS_CYCLE_INTERVAL * 1000);
+            
+            // gracefully quit for SIGINT or SIGTERM.
+            if (signal_gracefully_quit) {
+                srs_trace("cleanup for gracefully terminate.");
+                return ret;
+            }
         
-// for gperf heap checker,
-// @see: research/gperftools/heap-checker/heap_checker.cc
-// if user interrupt the program, exit to check mem leak.
-// but, if gperf, use reload to ensure main return normally,
-// because directly exit will cause core-dump.
+            // for gperf heap checker,
+            // @see: research/gperftools/heap-checker/heap_checker.cc
+            // if user interrupt the program, exit to check mem leak.
+            // but, if gperf, use reload to ensure main return normally,
+            // because directly exit will cause core-dump.
 #ifdef SRS_AUTO_GPERF_MC
             if (signal_gmc_stop) {
                 srs_warn("gmc got singal to stop server.");
@@ -930,6 +950,7 @@ int SrsServer::do_cycle()
             }
 #endif
         
+            // do reload the config.
             if (signal_reload) {
                 signal_reload = false;
                 srs_info("get signal reload, to reload the config.");

@@ -275,16 +275,22 @@ private:
     */
     bool signal_reload;
     bool signal_gmc_stop;
+    bool signal_gracefully_quit;
 public:
     SrsServer();
     virtual ~SrsServer();
-public:
+private:
     /**
     * the destroy is for gmc to analysis the memory leak,
     * if not destroy global/static data, the gmc will warning memory leak.
     * in service, server never destroy, directly exit when restart.
     */
     virtual void destroy();
+    /**
+     * when SIGTERM, SRS should do cleanup, for example, 
+     * to stop all ingesters, cleanup HLS and dvr.
+     */
+    virtual void dispose();
 // server startup workflow, @see run_master()
 public:
     virtual int initialize(ISrsServerCycle* cycle_handler);