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setsockopt SOCKET, LEVEL, OPTNAME, OPTVAL |
设置套接字选项OPTNAME，在指定的级别上SOCKET值OPTVAL。有效值OPTNAME，您将需要进口的Socket模块，如下表所示，
undef - 失败时
1 - 成功时
OPTNAME Description SO_DEBUG Enable/disable recording of debugging information.
SO_REUSEADDR Enable/disable local address reuse.
SO_KEEPALIVE Enable/disable keep connections alive.
SO_DONTROUTE Enable/disable routing bypass for outgoing messages.
SO_LINGER Linger on close if data is present.
SO_BROADCAST Enable/disable permission to transmit broadcast messages.
SO_OOBINLINE Enable/disable reception of out-of-band data in band.
SO_SNDBUF Set buffer size for output.
SO_RCVBUF Set buffer size for input.
SO_TYPE Get the type of the socket (get only).
SO_ERROR Get and clear error on the socket (get only).