1.\" $OpenBSD: shutdown.2,v 1.9 2000/08/09 12:57:54 aaron Exp $ 2.\" $NetBSD: shutdown.2,v 1.5 1995/02/27 12:37:11 cgd Exp $ 3.\" 4.\" Copyright (c) 1983, 1991, 1993 5.\" The Regents of the University of California. All rights reserved. 6.\" 7.\" Redistribution and use in source and binary forms, with or without 8.\" modification, are permitted provided that the following conditions 9.\" are met: 10.\" 1. Redistributions of source code must retain the above copyright 11.\" notice, this list of conditions and the following disclaimer. 12.\" 2. Redistributions in binary form must reproduce the above copyright 13.\" notice, this list of conditions and the following disclaimer in the 14.\" documentation and/or other materials provided with the distribution. 15.\" 3. All advertising materials mentioning features or use of this software 16.\" must display the following acknowledgement: 17.\" This product includes software developed by the University of 18.\" California, Berkeley and its contributors. 19.\" 4. Neither the name of the University nor the names of its contributors 20.\" may be used to endorse or promote products derived from this software 21.\" without specific prior written permission. 22.\" 23.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33.\" SUCH DAMAGE. 34.\" 35.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93 36.\" 37.Dd June 4, 1993 38.Dt SHUTDOWN 2 39.Os 40.Sh NAME 41.Nm shutdown 42.Nd shut down part of a full-duplex connection 43.Sh SYNOPSIS 44.Fd #include <sys/types.h> 45.Fd #include <sys/socket.h> 46.Ft int 47.Fn shutdown "int s" "int how" 48.Sh DESCRIPTION 49The 50.Fn shutdown 51call causes all or part of a full-duplex connection on 52the socket associated with 53.Fa s 54to be shut down. 55If 56.Fa how 57is 58.Ar SHUT_RD , 59further receives will be disallowed. 60If 61.Fa how 62is 63.Ar SHUT_WR , 64further sends will be disallowed. 65If 66.Fa how 67is 68.Ar SHUT_RDWR , 69further sends and receives will be disallowed. 70.Sh RETURN VALUES 71A 0 is returned if the call succeeds, \-1 if it fails. 72.Sh ERRORS 73The call succeeds unless: 74.Bl -tag -width Er 75.It Bq Er EINVAL 76.Fa how 77is not 78.Ar SHUT_RD , 79.Ar SHUT_WR , 80or 81.Ar SHUT_RDWR . 82.It Bq Er EBADF 83.Fa s 84is not a valid descriptor. 85.It Bq Er ENOTSOCK 86.Fa s 87is a file, not a socket. 88.It Bq Er ENOTCONN 89The specified socket is not connected. 90.El 91.Sh SEE ALSO 92.Xr connect 2 , 93.Xr socket 2 94.Sh HISTORY 95The 96.Fn shutdown 97function call appeared in 98.Bx 4.2 . 99The 100.Fa how 101arguments used to be simply 0, 1, and 2, but now have named values 102as specified by 103.St -xpg4 . 104