1.\" $NetBSD: shutdown.2,v 1.13 2002/08/17 18:38:46 yamt 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. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93 35.\" 36.Dd August 18, 2002 37.Dt SHUTDOWN 2 38.Os 39.Sh NAME 40.Nm shutdown 41.Nd shut down part of a full-duplex connection 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.Fd #include \*[Lt]sys/socket.h\*[Gt] 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. 55The 56.Fa how 57argument specifies which part of the connection will be shut down. 58Permissible values are: 59.Bl -tag -width SHUT_RDWRXX -offset indent 60.It SHUT_RD 61further receives will be disallowed. 62.It SHUT_WR 63further sends will be disallowed. 64.It SHUT_RDWR 65further sends and receives will be disallowed. 66.El 67.Sh RETURN VALUES 68A 0 is returned if the call succeeds, -1 if it fails. 69.Sh ERRORS 70The call succeeds unless: 71.Bl -tag -width Er 72.It Bq Er EBADF 73.Fa s 74is not a valid descriptor. 75.It Bq Er EINVAL 76The 77.Fa how 78argument is invalid. 79.It Bq Er ENOTCONN 80The specified socket is not connected. 81.It Bq Er ENOTSOCK 82.Fa s 83is a file, not a socket. 84.El 85.Sh SEE ALSO 86.Xr connect 2 , 87.Xr socket 2 88.Sh HISTORY 89The 90.Fn shutdown 91function call appeared in 92.Bx 4.2 . 93The 94.Fa how 95arguments used to be simply 0, 1, and 2, but now have named values 96as specified by 97.St -xpg4 . 98