1.\" Copyright (c) 1983, 1991 The Regents of the University of California. 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. 9.\" 2. Redistributions in binary form must reproduce the above copyright 10.\" notice, this list of conditions and the following disclaimer in the 11.\" documentation and/or other materials provided with the distribution. 12.\" 3. All advertising materials mentioning features or use of this software 13.\" must display the following acknowledgement: 14.\" This product includes software developed by the University of 15.\" California, Berkeley and its contributors. 16.\" 4. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" from: @(#)shutdown.2 6.4 (Berkeley) 3/10/91 33.\" $Id: shutdown.2,v 1.4 1993/11/29 21:25:38 jtc Exp $ 34.\" 35.Dd March 10, 1991 36.Dt SHUTDOWN 2 37.Os BSD 4.2 38.Sh NAME 39.Nm shutdown 40.Nd shut down part of a full-duplex connection 41.Sh SYNOPSIS 42.Fd #include <sys/socket.h> 43.Ft int 44.Fn shutdown "int s" "int how" 45.Sh DESCRIPTION 46The 47.Fn shutdown 48call causes all or part of a full-duplex connection on 49the socket associated with 50.Fa s 51to be shut down. 52If 53.Fa how 54is 0, further receives will be disallowed. 55If 56.Fa how 57is 1, further sends will be disallowed. 58If 59.Fa how 60is 2, further sends and receives will be disallowed. 61.Sh DIAGNOSTICS 62A 0 is returned if the call succeeds, -1 if it fails. 63.Sh ERRORS 64The call succeeds unless: 65.Bl -tag -width Er 66.It Bq Er EBADF 67.Fa S 68is not a valid descriptor. 69.It Bq Er ENOTSOCK 70.Fa S 71is a file, not a socket. 72.It Bq Er ENOTCONN 73The specified socket is not connected. 74.El 75.Sh SEE ALSO 76.Xr connect 2 , 77.Xr socket 2 78.Sh HISTORY 79The 80.Fn shutdown 81function call appeared in 82.Bx 4.2 . 83