Thread: How can I tell when receiving buffer is no longer receiving?

Basically I'm connecting to a server.
I have the client reading in what the server says.
How can I tell when the server is done sending data?

Here is what I have

Code:

while(recv(sockfd,buf,MAXDATASIZE-1,0))
     {
         printf("%s",buf);
     }

// but now, after it's done receiving i want to send something.
//i just dont want to send while im still receiving.

Thanks