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socket编程中如何立刻判断出对方和网络断开了
man send
RETURN VALUE
The calls return the number of characters sent, or -1 if an error
occurred.
ERRORS
These are some standard errors generated by the socket layer. Addi-
tional errors may be generated and returned from the underlying proto-
col modules; see their respective manual pages.
EAGAIN or EWOULDBLOCK
The socket is marked non-blocking and the requested operation
would block.
EBADF An invalid descriptor was specified.
ECONNRESET
Connection reset by peer.
EDESTADDRREQ
The socket is not connection-mode, and no peer address is set.
EFAULT An invalid user space address was specified for a parameter.
EINTR A signal occurred before any data was transmitted.
EINVAL Invalid argument passed.
EISCONN
The connection-mode socket EMSGSIZE
The socket type requires that message be sent atomically, and
the size of the message to be sent made this impossible.
ENOBUFS
The output queue for a network interface was full. This gener-
ally indicates that the interface has stopped sending, but may
be caused by transient congestion. (Normally, this does not
occur in Linux. Packets are just silently dropped when a device
queue overflows.)
ENOMEM No memory available.
ENOTCONN
The socket is not connected, and no target has been given.
ENOTSOCK
The argument s is not a socket.
EOPNOTSUPP
Some bit in the flags argument is inappropriate for the socket
type.
EPIPE The local end has been shut down on a connection oriented
socket. In this case the process will also receive a SIGPIPE
unless MSG_NOSIGNAL is set.was connected already but a recipient |
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发表于 2004-09-22 14:39
