For #1579, define signals for fast/grace quit and upgrade

trunk/src/app/srs_app_server.cpp

@@ -395,7 +395,7 @@ srs_error_t SrsSignalManager::start()
     sa.sa_handler = SrsSignalManager::sig_catcher;
     sigemptyset(&sa.sa_mask);
     sa.sa_flags = 0;
-    sigaction(SRS_SIGNAL_GRACEFULLY_QUIT, &sa, NULL);
+    sigaction(SRS_SIGNAL_FAST_QUIT, &sa, NULL);
     
     sa.sa_handler = SrsSignalManager::sig_catcher;
     sigemptyset(&sa.sa_mask);
@@ -407,8 +407,8 @@ srs_error_t SrsSignalManager::start()
     sa.sa_flags = 0;
     sigaction(SRS_SIGNAL_REOPEN_LOG, &sa, NULL);
     
-    srs_trace("signal installed, reload=%d, reopen=%d, grace_quit=%d",
-              SRS_SIGNAL_RELOAD, SRS_SIGNAL_REOPEN_LOG, SRS_SIGNAL_GRACEFULLY_QUIT);
+    srs_trace("signal installed, reload=%d, reopen=%d, fast_quit=%d",
+              SRS_SIGNAL_RELOAD, SRS_SIGNAL_REOPEN_LOG, SRS_SIGNAL_FAST_QUIT);
     
     if ((err = trd->start()) != srs_success) {
         return srs_error_wrap(err, "signal manager");
@@ -863,8 +863,8 @@ void SrsServer::on_signal(int signo)
 #endif
     }
     
-    if ((signo == SIGINT || signo == SRS_SIGNAL_GRACEFULLY_QUIT) && !signal_gracefully_quit) {
-        srs_trace("sig=%d, user terminate program, gracefully quit", signo);
+    if ((signo == SIGINT || signo == SRS_SIGNAL_FAST_QUIT) && !signal_gracefully_quit) {
+        srs_trace("sig=%d, user terminate program, fast quit", signo);
         signal_gracefully_quit = true;
         return;
     }

trunk/src/app/srs_app_server.hpp

@@ -260,12 +260,13 @@ public:
     // The signal manager convert signal to io message,
     // whatever, we will got the signo like the orignal signal(int signo) handler.
     // @param signo the signal number from user, where:
-    //      SRS_SIGNAL_GRACEFULLY_QUIT, the SIGTERM, dispose then quit.
+    //      SRS_SIGNAL_FAST_QUIT, the SIGTERM, do essential dispose then quit.
+    //      SRS_SIGNAL_GRACEFULLY_QUIT, the SIGQUIT, do careful dispose then quit.
     //      SRS_SIGNAL_REOPEN_LOG, the SIGUSR1, reopen the log file.
     //      SRS_SIGNAL_RELOAD, the SIGHUP, reload the config.
     //      SRS_SIGNAL_PERSISTENCE_CONFIG, application level signal, persistence config to file.
     // @remark, for SIGINT:
-    //       no gmc, directly exit.
+    //       no gmc, fast quit, do essential dispose then quit.
     //       for gmc, set the variable signal_gmc_stop, the cycle will return and cleanup for gmc.
     // @remark, maybe the HTTP RAW API will trigger the on_signal() also.
     virtual void on_signal(int signo);

trunk/src/kernel/srs_kernel_consts.hpp

@@ -124,8 +124,15 @@
 #define SRS_SIGNAL_RELOAD SIGHUP
 // Reopen the log file.
 #define SRS_SIGNAL_REOPEN_LOG SIGUSR1
-// The signal for srs to gracefully quit, do dispose then exit.
-#define SRS_SIGNAL_GRACEFULLY_QUIT SIGTERM
+// For gracefully upgrade, start new SRS and gracefully quit old one.
+// @see https://github.com/ossrs/srs/issues/1579
+// TODO: Not implemented.
+#define SRS_SIGNAL_UPGRADE SIGUSR2
+// The signal for srs to fast quit, do essential dispose then exit.
+#define SRS_SIGNAL_FAST_QUIT SIGTERM
+// The signal for srs to gracefully quit, do carefully dispose then exit.
+// TODO: FIXME: Not implemented.
+#define SRS_SIGNAL_GRACEFULLY_QUIT SIGQUIT
 
 // The application level signals.
 // Persistence the config in memory to config file.