1.\" $NetBSD: shutdown.2,v 1.17 2004/05/13 10:20:58 wiz Exp $ 2.\" 3.\" Copyright (c) 1983, 1991, 1993 4.\" The Regents of the University of California. All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. Neither the name of the University nor the names of its contributors 15.\" may be used to endorse or promote products derived from this software 16.\" without specific prior written permission. 17.\" 18.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28.\" SUCH DAMAGE. 29.\" 30.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93 31.\" 32.Dd August 18, 2002 33.Dt SHUTDOWN 2 34.Os 35.Sh NAME 36.Nm shutdown 37.Nd shut down part of a full-duplex connection 38.Sh LIBRARY 39.Lb libc 40.Sh SYNOPSIS 41.In 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. 51The 52.Fa how 53argument specifies which part of the connection will be shut down. 54Permissible values are: 55.Bl -tag -width SHUT_RDWRXX -offset indent 56.It SHUT_RD 57further receives will be disallowed. 58.It SHUT_WR 59further sends will be disallowed. 60.It SHUT_RDWR 61further sends and receives will be disallowed. 62.El 63.Sh RETURN VALUES 64A 0 is returned if the call succeeds, \-1 if it fails. 65.Sh ERRORS 66The call succeeds unless: 67.Bl -tag -width Er 68.It Bq Er EBADF 69.Fa s 70is not a valid descriptor. 71.It Bq Er EINVAL 72The 73.Fa how 74argument is invalid. 75.It Bq Er ENOTCONN 76The specified socket is not connected. 77.It Bq Er ENOTSOCK 78.Fa s 79is a file, not a socket. 80.El 81.Sh SEE ALSO 82.Xr connect 2 , 83.Xr socket 2 84.Sh HISTORY 85The 86.Fn shutdown 87function call appeared in 88.Bx 4.2 . 89The 90.Fa how 91arguments used to be simply 0, 1, and 2, but now have named values 92as specified by 93.St -xpg4 . 94