问一个函数的作用。

lonenomad 2004-11-22 08:59:20
shutdown(nowSocket,SD_BOTH)是有关SOCKET的
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lonenomad 2004-11-22
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shutdown()还可以有别的参数吗,说的详细一点好吗。
晨星 2004-11-22
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当然,收发都关闭了。然后就可以安全得closesocket了。
lonenomad 2004-11-22
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晕,我查过MSDN了,可我英文不太好,哎,结贴。郁闷啊,谢谢各位了。
老夏Max 2004-11-22
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The Windows Sockets shutdown function disables sends or receives on a socket.

int shutdown (
SOCKET s,
int how
);

Parameters
s
[in] A descriptor identifying a socket.
how
[in] A flag that describes what types of operation will no longer be allowed.
Remarks
The shutdown function is used on all types of sockets to disable reception, transmission, or both.

If the how parameter is SD_RECEIVE, subsequent calls to the recv function on the socket will be disallowed. This has no effect on the lower protocol layers. For TCP sockets, if there is still data queued on the socket waiting to be received, or data arrives subsequently, the connection is reset, since the data cannot be delivered to the user. For UDP sockets, incoming datagrams are accepted and queued. In no case will an ICMP error packet be generated.

If the how parameter is SD_SEND, subsequent calls to the send function are disallowed. For TCP sockets, a FIN will be sent after all data is sent and acknowledged by the receiver.

Setting how to SD_BOTH disables both sends and receives as described above.

The shutdown function does not close the socket. Any resources attached to the socket will not be freed until closesocket is invoked.

To assure that all data is sent and received on a connected socket before it is closed, an application should use shutdown to close connection before calling closesocket. For example, to initiate a graceful disconnect:

Call WSAAsyncSelect to register for FD_CLOSE notification.
Call shutdown with how=SD_SEND.
When FD_CLOSE received, call recv until zero returned, or SOCKET_ERROR.
Call closesocket.
Note The shutdown function does not block regardless of the SO_LINGER setting on the socket.

An application should not rely on being able to re-use a socket after it has been shut down. In particular, a Windows Sockets provider is not required to support the use of connect on a socket that has been shutdown.

Return Values
If no error occurs, shutdown returns zero. Otherwise, a value of SOCKET_ERROR is returned, and a specific error code can be retrieved by calling WSAGetLastError.

Error Codes
WSANOTINITIALISED A successful WSAStartup must occur before using this function.
WSAENETDOWN The network subsystem has failed.
WSAEINVAL The how parameter is not valid, or is not consistent with the socket type. For example, SD_SEND is used with a UNI_RECV socket type.
WSAEINPROGRESS A blocking Windows Sockets 1.1 call is in progress, or the service provider is still processing a callback function.
WSAENOTCONN The socket is not connected (connection-oriented sockets only).
WSAENOTSOCK The descriptor is not a socket.
晨星 2004-11-22
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查MSDN呀。参数的那么多说明,谁记得住啊?

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