WINSOCK call to recv stalls

[taylorjonl]

I am writing a proxy server for DII and have the following code.

Code Select Expand

   while(1)
   {
printf("\t\tChecking for input on client/server sockets\n"); fflush(stdout);

       //
       int n = select(2, 0, &fds, 0, &tv);

       if(n == 0)
           continue;
       if(n < 0)
           break;

       //
       if(FD_ISSET(server, &fds))
       {
printf("\t\t\tFound activity on server socket\n"); fflush(stdout);
           // receive data from server
           int size = recv(server, sbuffer.buffer, sbuffer.length, 0);
printf("\t\t\tReceived %d bytes of data\n", size); fflush(stdout);
           if(size < 0)
           {
               // error reading data
               printf("Error receiving data from server\n");
               break;
           }

           // handle decompression here
           // handle passing to module here

printf("\t\t\tSending %d bytes of data to client\n", size); fflush(stdout);
           // send data to client
           int sent = send(client, sbuffer.buffer, size, 0);
           if(sent < 0)
           {
               // error reading data
               printf("Error sending data to client\n");
               break;
           }
printf("\t\t\tReceived %d bytes of data\n", sent); fflush(stdout);
       }
       else
       {
printf("\t\t\tFound activity on client socket\n"); fflush(stdout);
           // receive data from client
           int size = recv(client, cbuffer.buffer, cbuffer.length, 0);
printf("\t\t\tReceived %d bytes of data\n", size); fflush(stdout);
           if(size < 0)
           {
               // error reading data
               printf("Error receiving data from client\n");
               break;
           }

           // handle compression here
           // handle passing to module here

printf("\t\t\tSending %d bytes of data to server\n", size); fflush(stdout);
           // send data to server
           int sent = send(server, cbuffer.buffer, size, 0);
           if(sent < 0)
           {
               // error reading data
               printf("Error sending data to server\n");
               break;
           }
printf("\t\t\tReceived %d bytes of data\n", sent); fflush(stdout);
       }
   }


What happens is that I get this output.

Code Select Expand

Checking for input on client/server sockets
   Found activity on server socket

It freezes on the recv call.  How is that?  'select' is supposed to return when a socket is ready for input and then 'FD_ISSET' should tell me if it is that socket.  Why is it freezing?

I am a newbie socket programmer but this should work shouldn't it?