shutdown() -- shutdown full-duplex connection on socket

SYNOPSIS

#include <sys/socket.h>

int shutdown(int s, int how);

The shutdown() function shuts down all or part of a full-duplex connection on the socket associated with s. If how is SHUT_RD, then further receives are disallowed. If how is SHUT_WR, then further sends are disallowed. If how is SHUT_RDWR, then further sends and receives are disallowed.

PARAMETERS

s: Is the socket descriptor to shut down.
how: Specifies the type of shutdown.

RETURN VALUES

Upon successful completion, shutdown() returns 0. Otherwise, -1 is returned and errno is set to one of the following:

EBADF: The socket argument is not a valid file descriptor.
EINVAL: The how argument is invalid.
ENOTCONN: The socket is not connected. (connection oriented sockets only.)
ENOTSOCK: The s argument does not refer to a socket.