1.\" $OpenBSD: shutdown.2,v 1.10 2003/06/02 20:18:39 millert 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. Neither the name of the University nor the names of its contributors 16.\" may be used to endorse or promote products derived from this software 17.\" without specific prior written permission. 18.\" 19.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29.\" SUCH DAMAGE. 30.\" 31.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93 32.\" 33.Dd June 4, 1993 34.Dt SHUTDOWN 2 35.Os 36.Sh NAME 37.Nm shutdown 38.Nd shut down part of a full-duplex connection 39.Sh SYNOPSIS 40.Fd #include <sys/types.h> 41.Fd #include <sys/socket.h> 42.Ft int 43.Fn shutdown "int s" "int how" 44.Sh DESCRIPTION 45The 46.Fn shutdown 47call causes all or part of a full-duplex connection on 48the socket associated with 49.Fa s 50to be shut down. 51If 52.Fa how 53is 54.Ar SHUT_RD , 55further receives will be disallowed. 56If 57.Fa how 58is 59.Ar SHUT_WR , 60further sends will be disallowed. 61If 62.Fa how 63is 64.Ar SHUT_RDWR , 65further sends and receives will be disallowed. 66.Sh RETURN VALUES 67A 0 is returned if the call succeeds, \-1 if it fails. 68.Sh ERRORS 69The call succeeds unless: 70.Bl -tag -width Er 71.It Bq Er EINVAL 72.Fa how 73is not 74.Ar SHUT_RD , 75.Ar SHUT_WR , 76or 77.Ar SHUT_RDWR . 78.It Bq Er EBADF 79.Fa s 80is not a valid descriptor. 81.It Bq Er ENOTSOCK 82.Fa s 83is a file, not a socket. 84.It Bq Er ENOTCONN 85The specified socket is not connected. 86.El 87.Sh SEE ALSO 88.Xr connect 2 , 89.Xr socket 2 90.Sh HISTORY 91The 92.Fn shutdown 93function call appeared in 94.Bx 4.2 . 95The 96.Fa how 97arguments used to be simply 0, 1, and 2, but now have named values 98as specified by 99.St -xpg4 . 100