Function nw_SetSocketOptions

networking/networking.cpp:672–730

Sets the size of buffers

// Sets the size of buffers
void nw_SetSocketOptions(SOCKET sock) {
  int broadcast;
  int ret, cursize, bufsize, trysize;
  socklen_t cursizesize;

  // Set the mode of the socket to allow broadcasting.  We need to be able to broadcast
  // when a game is searched for in IPX mode.
  broadcast = 1;
  setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (LPSTR)&broadcast, sizeof(broadcast));
  setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (LPSTR)&broadcast, sizeof(broadcast));

  int error = make_nonblocking(sock);
  if (error == SOCKET_ERROR) {
    mprintf(0, "Unable to make socket non-blocking -- %d", WSAGetLastError());
  }

  // try and increase the size of my receive buffer
  bufsize = iMaxReceiveBufsize;

  // set the current size of the receive buffer
  cursizesize = sizeof(int);
  getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&cursize, &cursizesize);
  for (trysize = bufsize; trysize >= cursize; trysize >>= 1) {
    ret = setsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&trysize, sizeof(trysize));
    if (ret == SOCKET_ERROR) {
      int wserr;

      wserr = WSAGetLastError();
      if ((wserr == WSAENOPROTOOPT) || (wserr == WSAEINVAL))
        break;

    } else
      break;
  }
  getsockopt(sock, SOL_SOCKET, SO_RCVBUF, (LPSTR)&cursize, &cursizesize);
  mprintf(0, "Receive buffer set to %d\n", cursize);
  /*
  // set the current size of the send buffer
  bufsize = MAX_RECEIVE_BUFSIZE/4;
  cursizesize = sizeof(int);
  getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&cursize, &cursizesize);
  for ( trysize = bufsize; trysize >= cursize; trysize >>= 1 )
  {
          ret = setsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&trysize, sizeof(trysize));
          if ( ret == SOCKET_ERROR )
          {
                  int wserr;

                  wserr = WSAGetLastError();
                  if ( (wserr == WSAENOPROTOOPT) || (wserr == WSAEINVAL) )
                          break;
          }
          else
                  break;
  }
  getsockopt(sock, SOL_SOCKET, SO_SNDBUF, (LPSTR)&cursize, &cursizesize);
  mprintf(0, "Send buffer set to %d\n", cursize);
  */