Update comm_proxy.cpp

src/gausskernel/cbb/communication/comm_proxy/comm_proxy.cpp

@@ -865,7 +865,7 @@ description: This system call performs control operations on the epoll instance
 arguments: The first argument is a specific file descriptor for epoll generated by epoll_ create. 
 				   The second argument indicates the actions to be taken, such as registering events.
 				   The third argument is associated file descriptor.
-                   The fourth argument is a pointer of type struct epoll_event.
+                   The fourth argument is a pointer of type struct epoll_event, used to tell the kernel what events and actions to listen for.
 return value: The return value is 0 if succeed, - 1 is returned for failure and error reason is stored in errno. 
 note: none
 date: 2022/8/8
@@ -1110,6 +1110,23 @@ int comm_proxy_epoll_ctl(int epfd, int op, int fd, struct epoll_event* event)
     return result.s_ret;
 }
 
+/*
+function name: comm_proxy_epoll_wait
+description: Wait for IO events on the specified epoll file descriptor.
+arguments: The first argument is a specific file descriptor for epoll generated by epoll_ create. 
+				   The second argument is a pointer to type epoll_ event structure, but it is now used
+                   as a container to get the collection of events from the kernel.
+				   The third argument is used to tell how large the container is (number of event 
+                   array members), that is, the number of events that can be processed each time.
+                  The fourth argument is the timeout value for waiting for IO events.
+return value: When successful, comm_proxy_epoll_wait() returns the number of file descriptors
+					 ready for the requested IO. Returns zero if no file descriptor is ready within the 
+                     requested timeout milliseconds. When an error occurs, comm_proxy_epoll_wait() 
+                     returns - 1 and sets errno correctly.
+note: none
+date: 2022/8/8
+contact tel: 18720816902
+*/
 int comm_proxy_epoll_wait(int epfd, struct epoll_event* events, int maxevents, int timeout)
 {
     CommWaitEpollWaitParam param;