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Non-Blocking Winsock Sockets

Posted on 1998-07-08
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Last Modified: 2013-12-03
How can I create a non-blocking socket in VC++ using Winsock (no MFC)?
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Question by:VEngineer
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WDB earned 20 total points
ID: 1409662
Use This to Create a Non-Blocking Socket

BOOL setSockNonBlocking(HWND hwnd,SOCKET sock)
{
   int  iStatus;

   if ((iStatus =WSAAsyncSelect(sock,hwnd,WSOCK_MESSAGE,                    FD_CONNECT | FD_READ | FD_CLOSE)) > 0) {
      // report error
      return FALSE;
   }
   return(TRUE);
}  // setSockNonBlocking(HWND,SOCKET)
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Expert Comment

by:WDB
ID: 1409663
Or if you need to do this explicitly try:

u_long argp = 1L;
int nRet;
SOCKET s;
.
s = socket(PF_INET,SOCK_DGRAM,0);
if(s==INVALID_SOCKET) // report error

// Make Socket Non-Blocking

nRet = ioctlsocket(s,FIONBIO,(u_long FAR *)&argp);
if(nRet == SOCKET_ERROR) // report error
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