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.\"     $Id: shutdown.2,v 1.1.1.1 1999/03/21 22:52:23 freitag Exp $

.\"

.\" Modified Sat Jul 24 09:57:55 1993 by Rik Faith <faith@cs.unc.edu>

.\" Modified Tue Oct 22 22:04:51 1996 by Eric S. Raymond <esr@thyrsus.com>

.\" Modified 1998 by Andi Kleen

.\"

.TH SHUTDOWN 2 2016-03-15 "Linux" "Linux Programmer's Manual"

.SH NAME

shutdown \- shut down part of a full-duplex connection

.SH SYNOPSIS

.B #include <sys/socket.h>

.PP

.BI "int shutdown(int " sockfd ", int " how );

.SH DESCRIPTION

The

.BR shutdown ()

call causes all or part of a full-duplex connection on the socket

associated with

.I sockfd

to be shut down.

If

.I how

is

.BR SHUT_RD ,

further receptions will be disallowed.

If

.I how

is

.BR SHUT_WR ,

further transmissions will be disallowed.

If

.I how

is

.BR SHUT_RDWR ,

further receptions and transmissions will be disallowed.

.SH RETURN VALUE

On success, zero is returned.

On error, \-1 is returned, and

.I errno

is set appropriately.

.SH ERRORS

.TP

.B EBADF

.I sockfd

is not a valid file descriptor.

.TP

.B EINVAL

An invalid value was specified in

.IR how

(but see BUGS).

.TP

.B ENOTCONN

The specified socket is not connected.

.TP

.B ENOTSOCK

The file descriptor

.I sockfd

does not refer to a socket.

.SH CONFORMING TO

POSIX.1-2001, POSIX.1-2008, 4.4BSD

.RB ( shutdown ()

first appeared in 4.2BSD).

.SH NOTES

The constants

.BR SHUT_RD ,

.BR SHUT_WR ,

.B SHUT_RDWR

have the value 0, 1, 2,

respectively, and are defined in

.I <sys/socket.h>

since glibc-2.1.91.

.SH BUGS

Checks for the validity of

.I how

are done in domain-specific code,

and before Linux 3.7 not all domains performed these checks.

.\" https://bugzilla.kernel.org/show_bug.cgi?id=47111

Most notably, UNIX domain sockets simply ignored invalid values.

This problem was fixed for UNIX domain sockets

.\" commit fc61b928dc4d72176cf4bd4d30bf1d22e599aefc

.\" and for DECnet sockets in commit 46b66d7077b89fb4917ceef19b3f7dd86055c94a

in Linux 3.7.

.SH SEE ALSO

.BR connect (2),

.BR socket (2),

.BR socket (7)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I man-pages

project.

A description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.