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shutdown.html
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<!-- Creator : groff version 1.22.4 -->
<!-- CreationDate: Wed Jan 29 11:25:57 2020 -->
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<meta name="Content-Style" content="text/css">
<style type="text/css">
p { margin-top: 0; margin-bottom: 0; vertical-align: top }
pre { margin-top: 0; margin-bottom: 0; vertical-align: top }
table { margin-top: 0; margin-bottom: 0; vertical-align: top }
h1 { text-align: center }
</style>
<title>SHUTDOWN</title>
</head>
<body>
<h1 align="center">SHUTDOWN</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#RETURN VALUE">RETURN VALUE</a><br>
<a href="#ERRORS">ERRORS</a><br>
<a href="#CONFORMING TO">CONFORMING TO</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#BUGS">BUGS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<a href="#COLOPHON">COLOPHON</a><br>
<hr>
<h2>NAME
<a name="NAME"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">shutdown - shut
down part of a full-duplex connection</p>
<h2>SYNOPSIS
<a name="SYNOPSIS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>#include
<sys/socket.h></b></p>
<p style="margin-left:11%; margin-top: 1em"><b>int
shutdown(int</b> <i>sockfd</i><b>, int</b>
<i>how</i><b>);</b></p>
<h2>DESCRIPTION
<a name="DESCRIPTION"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The
<b>shutdown</b>() call causes all or part of a full-duplex
connection on the socket associated with <i>sockfd</i> to be
shut down. If <i>how</i> is <b>SHUT_RD</b>, further
receptions will be disallowed. If <i>how</i> is
<b>SHUT_WR</b>, further transmissions will be disallowed. If
<i>how</i> is <b>SHUT_RDWR</b>, further receptions and
transmissions will be disallowed.</p>
<h2>RETURN VALUE
<a name="RETURN VALUE"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">On success,
zero is returned. On error, -1 is returned, and <i>errno</i>
is set appropriately.</p>
<h2>ERRORS
<a name="ERRORS"></a>
</h2>
<table width="100%" border="0" rules="none" frame="void"
cellspacing="0" cellpadding="0">
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p style="margin-top: 1em"><b>EBADF</b></p></td>
<td width="2%"></td>
<td width="78%">
<p style="margin-top: 1em"><i>sockfd</i> is not a valid
file descriptor.</p></td></tr>
<tr valign="top" align="left">
<td width="11%"></td>
<td width="9%">
<p><b>EINVAL</b></p></td>
<td width="2%"></td>
<td width="78%">
<p>An invalid value was specified in <i>how</i> (but see
BUGS).</p> </td></tr>
</table>
<p style="margin-left:11%;"><b>ENOTCONN</b></p>
<p style="margin-left:22%;">The specified socket is not
connected.</p>
<p style="margin-left:11%;"><b>ENOTSOCK</b></p>
<p style="margin-left:22%;">The file descriptor
<i>sockfd</i> does not refer to a socket.</p>
<h2>CONFORMING TO
<a name="CONFORMING TO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">POSIX.1-2001,
POSIX.1-2008, 4.4BSD (<b>shutdown</b>() first appeared in
4.2BSD).</p>
<h2>NOTES
<a name="NOTES"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">The constants
<b>SHUT_RD</b>, <b>SHUT_WR</b>, <b>SHUT_RDWR</b> have the
value 0, 1, 2, respectively, and are defined in
<i><sys/socket.h></i> since glibc-2.1.91.</p>
<h2>BUGS
<a name="BUGS"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">Checks for the
validity of <i>how</i> are done in domain-specific code, and
before Linux 3.7 not all domains performed these checks.
Most notably, UNIX domain sockets simply ignored invalid
values. This problem was fixed for UNIX domain sockets in
Linux 3.7.</p>
<h2>SEE ALSO
<a name="SEE ALSO"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em"><b>close</b>(2),
<b>connect</b>(2), <b>socket</b>(2), <b>socket</b>(7)</p>
<h2>COLOPHON
<a name="COLOPHON"></a>
</h2>
<p style="margin-left:11%; margin-top: 1em">This page is
part of release 5.02 of the Linux <i>man-pages</i> 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/.</p>
<hr>
</body>
</html>