The reporting of exception conditions, tested for by use of the ESNDMSK parameter, differs between platforms. This is due to differences between TCP/IP implementations on those platforms.
Where a socket specified with the ESNDMSK parameter has been the subject of a GIVESOCKET, but has not yet been the subject of a TAKESOCKET, SELECT will continue to poll the socket until the TAKESOCKET occurs. In addition, SELECT cannot test sockets which are in this "given" state for normal I/O events.