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-.\" Copyright (c) 2007 Bruce M. Simpson.
-.\" Copyright (c) 1983, 1991, 1993
-.\"	The Regents of the University of California.  All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice, this list of conditions and the following disclaimer.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice, this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\" 3. Neither the name of the University nor the names of its contributors
-.\"    may be used to endorse or promote products derived from this software
-.\"    without specific prior written permission.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
-.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
-.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
-.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
-.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
-.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
-.\" SUCH DAMAGE.
-.\"
-.\"     @(#)shutdown.2	8.1 (Berkeley) 6/4/93
-.\"
-.Dd July 27, 2015
-.Dt SHUTDOWN 2
-.Os
-.Sh NAME
-.Nm shutdown
-.Nd disable sends and/or receives on a socket
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In sys/types.h
-.In sys/socket.h
-.Ft int
-.Fn shutdown "int s" "int how"
-.Sh DESCRIPTION
-The
-.Fn shutdown
-system call disables sends or receives on a socket.
-The
-.Fa how
-argument specifies the type of shutdown.
-Possible values are:
-.Bl -tag -width ".Dv SHUT_RDWR"
-.It Dv SHUT_RD
-Further receives will be disallowed.
-.It Dv SHUT_WR
-Further sends will be disallowed.
-This may cause actions specific to the protocol family of the socket
-.Fa s
-to happen; see
-.Sx IMPLEMENTATION NOTES .
-.It Dv SHUT_RDWR
-Further sends and receives will be disallowed.
-Implies
-.Dv SHUT_WR .
-.El
-.Pp
-If the file descriptor
-.Fa s
-is associated with a
-.Dv SOCK_STREAM
-socket, all or part of the full-duplex connection will be shut down.
-.\"
-.Sh IMPLEMENTATION NOTES
-The following protocol specific actions apply to the use of
-.Dv SHUT_WR
-(and potentially also
-.Dv SHUT_RDWR ) ,
-based on the properties of the socket associated with the file descriptor
-.Fa s .
-.Bl -column ".Dv PF_INET6" ".Dv SOCK_STREAM" ".Dv IPPROTO_SCTP"
-.It Sy Domain Ta Sy Type Ta Sy Protocol Ta Sy Action
-.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
-Failure,
-as socket is not connected.
-.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
-Failure,
-as socket is not connected.
-.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
-Send queued data and tear down association.
-.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
-Send queued data, wait for ACK, then send FIN.
-.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
-Failure,
-as socket is not connected.
-.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
-Failure,
-as socket is not connected.
-.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
-Send queued data and tear down association.
-.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
-Send queued data, wait for ACK, then send FIN.
-.El
-.\"
-.Sh RETURN VALUES
-.Rv -std shutdown
-.Sh ERRORS
-The
-.Fn shutdown
-system call fails if:
-.Bl -tag -width Er
-.It Bq Er EBADF
-The
-.Fa s
-argument is not a valid file descriptor.
-.It Bq Er EINVAL
-The
-.Fa how
-argument is invalid.
-.It Bq Er ENOTCONN
-The
-.Fa s
-argument specifies a socket which is not connected.
-.It Bq Er ENOTSOCK
-The
-.Fa s
-argument does not refer to a socket.
-.El
-.Sh SEE ALSO
-.Xr connect 2 ,
-.Xr socket 2 ,
-.Xr inet 4 ,
-.Xr inet6 4
-.Sh STANDARDS
-The
-.Fn shutdown
-system call is expected to comply with
-.St -p1003.1g-2000 ,
-when finalized.
-.Sh HISTORY
-The
-.Fn shutdown
-system call appeared in
-.Bx 4.2 .
-The
-.Dv SHUT_RD , SHUT_WR ,
-and
-.Dv SHUT_RDWR
-constants appeared in
-.St -p1003.1g-2000 .
-.Sh AUTHORS
-.An -nosplit
-This manual page was updated by
-.An Bruce M. Simpson Aq Mt bms@FreeBSD.org
-to reflect how
-.Fn shutdown
-behaves with
-.Dv PF_INET
-and
-.Dv PF_INET6
-sockets.
-.Sh BUGS
-The ICMP
-.Dq Li "port unreachable"
-message should be generated in response to
-datagrams received on a local port to which
-.Fa s
-is bound
-after
-.Fn shutdown
-is called.