Winsock: int SELECT (int NFDS, FD_SET FAR * READDS, FD_SET FAR * WRITEFDS, FD_SET FAR * EXCEPTFDS, CONST STRUCT TIMEVAL FAR * TIMEOUT);
NFDS [in] this parameter is ignored; it is inclined Only for Compatibility with Berkeley Sockets.
UNIX POSIX: INT SELECT (int NFDS, FD_SET * READFDS, FD_SET * WRITEFDS, FD_SET * ERRORFDS, STRUCT TIMEVAL * TIMEOUT);
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Winsock This parameter is ignored, and there must be actual significance in UNIX POSIX, representing the scope of the file descriptor.
