support reload pid.

@@ -505,6 +505,21 @@ int SrsConfig::reload()
         srs_trace("reload listen success.");
     }
     
+    // merge config: pid
+    if (!srs_directive_equals(root->get("pid"), old_root->get("pid"))) {
+        for (it = subscribes.begin(); it != subscribes.end(); ++it) {
+            ISrsReloadHandler* subscribe = *it;
+            if ((ret = subscribe->on_reload_pid()) != ERROR_SUCCESS) {
+                srs_error("notify subscribes reload pid failed. ret=%d", ret);
+                return ret;
+            }
+        }
+        srs_trace("reload pid success.");
+    }
+
+    // directly supported for reload:
+    // chunk_size, ff_log_dir
+    
     // merge config: pithy_print
     if (!srs_directive_equals(root->get("pithy_print"), old_root->get("pithy_print"))) {
         for (it = subscribes.begin(); it != subscribes.end(); ++it) {

@@ -40,6 +40,11 @@ int ISrsReloadHandler::on_reload_listen()
     return ERROR_SUCCESS;
 }
 
+int ISrsReloadHandler::on_reload_pid()
+{
+    return ERROR_SUCCESS;
+}
+
 int ISrsReloadHandler::on_reload_pithy_print()
 {
     return ERROR_SUCCESS;

@@ -42,6 +42,7 @@ public:
     virtual ~ISrsReloadHandler();
 public:
     virtual int on_reload_listen();
+    virtual int on_reload_pid();
     virtual int on_reload_pithy_print();
     virtual int on_reload_vhost_added(std::string vhost);
     virtual int on_reload_vhost_removed(std::string vhost);

@@ -159,6 +159,7 @@ SrsServer::SrsServer()
 {
     signal_reload = false;
     signal_gmc_stop = false;
+    pid_fd = -1;
     
     // donot new object in constructor,
     // for some global instance is not ready now,
@@ -189,6 +190,11 @@ SrsServer::~SrsServer()
     
     close_listeners();
     
+    if (pid_fd > 0) {
+        ::close(pid_fd);
+        pid_fd = -1;
+    }
+    
 #ifdef SRS_HTTP_API
     srs_freep(http_api_handler);
 #endif
@@ -310,6 +316,7 @@ int SrsServer::acquire_pid_file()
     }
     
     srs_trace("write pid=%d to %s success!", pid, pid_file.c_str());
+    pid_fd = fd;
     
     return ret;
 }
@@ -554,3 +561,13 @@ int SrsServer::on_reload_listen()
 {
     return listen();
 }
+
+int SrsServer::on_reload_pid()
+{
+    if (pid_fd > 0) {
+        ::close(pid_fd);
+        pid_fd = -1;
+    }
+    
+    return acquire_pid_file();
+}

@@ -88,6 +88,7 @@ private:
     SrsIngester* ingester;
 #endif
 private:
+    int pid_fd;
     std::vector<SrsConnection*> conns;
     std::vector<SrsListener*> listeners;
     bool signal_reload;
@@ -107,8 +108,10 @@ public:
 private:
     virtual void close_listeners();
     virtual int accept_client(SrsListenerType type, st_netfd_t client_stfd);
+// interface ISrsThreadHandler.
 public:
     virtual int on_reload_listen();
+    virtual int on_reload_pid();
 };
 
 #endif
\ No newline at end of file