c - How to accept socket with timeout

Question

Is there is a timeout crossplatform soulution to accept client using accept function without setting socket to non-blocking?

I know that i should use select function to it, but what i'm doing wrong?

SOCKET NativesAcceptClient(SOCKET s, int timeout)
{
   int iResult;
   struct timeval tv;
   fd_set rfds;
   FD_ZERO(&rfds);
   FD_SET(s, &rfds);

   tv.tv_sec = (long)timeout;
   tv.tv_usec = 0;

   iResult = select(s, &rfds, (fd_set *) 0, (fd_set *) 0, &tv);
   if(iResult > 0)
   {
      return accept(s, NULL, NULL);
   }
   else
   {
     //always here, even if i connect from another application
   }
   return 0;
}

How to fix that? Thanks!

Answer 1

The first parameter of the select call should be equal to the the highest number file descriptor in your fd_set set plus 1 (see here). Try changing the first argument to s+1; you will need to add some logic when your have more than one socket in your set.