How network event FD_WRITE is generated when using Event Driven Sockets.

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C

Windows

Visual-Studio

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I am working on newtwork event based socket application.

When client has sent some data and there is something to be read on the socket, FD_READ network event is generated.

Now according to my understanding, when server wants to write over the socket, there must be an event generated i.e. FD_WRITE. But how this message will be generated?

When there is something available to be read, FD_READ is automatically generated but what about FD_WRITE when server wants to write something? :(

Anyone who can help me with this confusion please? :(

Following is the code snippet:

WSAEVENT hEvent = WSACreateEvent();
WSANETWORKEVENTS events;
WSAEventSelect(newSocketIdentifier, hEvent, FD_READ | FD_WRITE);

   while(1)
      {   //while(1) starts
         waitRet = WSAWaitForMultipleEvents(1, &hEvent, FALSE, WSA_INFINITE, FALSE);
		 //WSAResetEvent(hEvent);
         if(WSAEnumNetworkEvents(newSocketIdentifier,hEvent,&events) == SOCKET_ERROR)
                {
                  //Failure
	        }
	 else
		{   //else event occurred starts
		    if(events.lNetworkEvents & FD_READ)
			{
                            //recvfrom()   
			}
		    if(events.lNetworkEvents & FD_WRITE)
			{
				 //sendto()
			}
		}
      }