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.\" 31.Dd February 27, 2001 32.Dt SHUTDOWN 2 33.Os 34.Sh NAME 35.Nm shutdown 36.Nd shut down part of a full-duplex connection 37.Sh LIBRARY 38.Lb libc 39.Sh SYNOPSIS 40.In sys/types.h 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 the file descriptor 49.Fa s 50to be shut down. 51The 52.Fa how 53argument specifies the type of shutdown. 54Possible values are: 55.Bl -tag -width ".Dv SHUT_RDWR" 56.It Dv SHUT_RD 57further receives will be disallowed. 58.It Dv SHUT_WR 59further sends will be disallowed. 60.It Dv SHUT_RDWR 61further sends and receives will be disallowed. 62.El 63.Sh RETURN VALUES 64.Rv -std shutdown 65.Sh ERRORS 66The 67.Fn shutdown 68call fails if: 69.Bl -tag -width Er 70.It Bq Er EBADF 71The 72.Fa s 73argument is not a valid file descriptor. 74.It Bq Er EINVAL 75The 76.Fa how 77argument is invalid. 78.It Bq Er ENOTCONN 79The socket is not connected. 80.It Bq Er ENOTSOCK 81The 82.Fa s 83argument does not refer to a socket. 84.El 85.Sh SEE ALSO 86.Xr connect 2 , 87.Xr socket 2 88.Sh STANDARDS 89The 90.Fn shutdown 91function is expected to comply with 92.St -p1003.1g-2000 , 93when finalized. 94.Sh HISTORY 95The 96.Fn shutdown 97function call appeared in 98.Bx 4.2 . 99The 100.Dv SHUT_RD , SHUT_WR , 101and 102.Dv SHUT_RDWR 103constants appeared in 104.St -p1003.1g-2000 . 105