fix bug of fd leek in srs_app_server

trunk/src/app/srs_app_server.cpp

@@ -1223,10 +1223,9 @@ void SrsServer::resample_kbps()
 int SrsServer::accept_client(SrsListenerType type, st_netfd_t client_stfd)
 {
     int ret = ERROR_SUCCESS;
-    
+    int fd = st_netfd_fileno(client_stfd);
     int max_connections = _srs_config->get_max_connections();
     if ((int)conns.size() >= max_connections) {
-        int fd = st_netfd_fileno(client_stfd);
         
         srs_error("exceed the max connections, drop client: "
             "clients=%d, max=%d, fd=%d", (int)conns.size(), max_connections, fd);
@@ -1235,7 +1234,20 @@ int SrsServer::accept_client(SrsListenerType type, st_netfd_t client_stfd)
         
         return ret;
     }
-    
+    int val;
+    if ((val = fcntl(fd, F_GETFD, 0)) < 0) {
+        ret = ERROR_SYSTEM_PID_GET_FILE_INFO;
+        srs_error("fnctl F_GETFD error! fd=%d. ret=%#x", fd, ret);
+        srs_close_stfd(client_stfd);
+        return ret;
+    }
+    val |= FD_CLOEXEC;
+    if (fcntl(fd, F_SETFD, val) < 0) {
+        ret = ERROR_SYSTEM_PID_SET_FILE_INFO;
+        srs_error("fcntl F_SETFD error! fd=%d ret=%#x", fd, ret);
+        srs_close_stfd(client_stfd);
+        return ret;
+    } 
     SrsConnection* conn = NULL;
     if (type == SrsListenerRtmpStream) {
         conn = new SrsRtmpConn(this, client_stfd);