Update mc_tcp.cpp

src/gausskernel/cbb/communication/libcomm_core/mc_tcp.cpp

@@ -629,6 +629,17 @@ int mc_tcp_addr_init(const char* host, int port, struct sockaddr_storage* ss, in
     return (error == 1) ? 0 : error;
 }
 
+/*
+function name: mc_tcp_connect_nonblock
+description: This function is used to create a socket and establish a connection with the port of the specified host
+					in non blocking mode.
+arguments: The first parameter specifies a specific host, and the second parameter specifies a specific port of the host.
+return value: If the connection is successfully established, the file descriptor of the socket connected to the port of the
+					 specified host is returned; otherwise, - 1 is returned.
+note: none
+date: 2022/8/10
+contact tel: 18720816902
+*/
 int mc_tcp_connect_nonblock(const char* host, int port)
 {
     int sockfd, n;