NAME

shutdown — shut down part of a full-duplex connection

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/socket.h>

int
shutdown(int s, int how);

DESCRIPTION

The shutdown() call causes all or part of a full-duplex connection on the socket associated with s to be shut down. The how argument specifies which part of the connection will be shut down. Permissible values are:

SHUT_RD

further receives will be disallowed.

SHUT_WR

further sends will be disallowed.

SHUT_RDWR

further sends and receives will be disallowed.

RETURN VALUES

A 0 is returned if the call succeeds, -1 if it fails.

ERRORS

The call succeeds unless:

[EBADF]

s is not a valid descriptor.

[EINVAL]

The how argument is invalid.

[ENOTCONN]

The specified socket is not connected.

[ENOTSOCK]

s is a file, not a socket.

SEE ALSO

connect(2), socket(2)

HISTORY

The shutdown() function call appeared in 4.2BSD. The how arguments used to be simply 0, 1, and 2, but now have named values as specified by X/Open Portability Guide Issue 4 (“XPG4”).