1.\" Copyright (c) 1983, 1991, 1993 2.\" The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors 13.\" may be used to endorse or promote products derived from this software 14.\" without specific prior written permission. 15.\" 16.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 17.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 20.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26.\" SUCH DAMAGE. 27.\" 28.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93 29.\" $FreeBSD: src/lib/libc/sys/shutdown.2,v 1.7.2.7 2001/12/14 18:34:01 ru Exp $ 30.\" $DragonFly: src/lib/libc/sys/shutdown.2,v 1.2 2003/06/17 04:26:47 dillon Exp $ 31.\" 32.Dd February 27, 2001 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/types.h 42.In 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 the file descriptor 50.Fa s 51to be shut down. 52The 53.Fa how 54argument specifies the type of shutdown. 55Possible values are: 56.Bl -tag -width SHUT_RDWR 57.It Dv SHUT_RD 58further receives will be disallowed. 59.It Dv SHUT_WR 60further sends will be disallowed. 61.It Dv SHUT_RDWR 62further sends and receives will be disallowed. 63.El 64.Sh RETURN VALUES 65.Rv -std shutdown 66.Sh ERRORS 67The 68.Fn shutdown 69call fails if: 70.Bl -tag -width Er 71.It Bq Er EBADF 72The 73.Fa s 74argument is not a valid file descriptor. 75.It Bq Er EINVAL 76The 77.Fa how 78argument is invalid. 79.It Bq Er ENOTCONN 80The socket is not connected. 81.It Bq Er ENOTSOCK 82The 83.Fa s 84argument does not refer to a socket. 85.El 86.Sh SEE ALSO 87.Xr connect 2 , 88.Xr socket 2 89.Sh STANDARDS 90The 91.Fn shutdown 92function is expected to comply with 93.St -p1003.1g-2000 , 94when finalized. 95.Sh HISTORY 96The 97.Fn shutdown 98function call appeared in 99.Bx 4.2 . 100The 101.Dv SHUT_RD , SHUT_WR , 102and 103.Dv SHUT_RDWR 104constants appeared in 105.St -p1003.1g-2000 . 106