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192 lines
4.9 KiB
Groff
192 lines
4.9 KiB
Groff
.\" Copyright (c) 2007 Bruce M. Simpson.
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.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd March 5, 2007
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.Dt SHUTDOWN 2
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.Os
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.Sh NAME
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.Nm shutdown
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.Nd disable sends and/or receives on a socket
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.Ft int
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.Fn shutdown "int s" "int how"
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.Sh DESCRIPTION
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The
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.Fn shutdown
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system call disables sends or receives on a socket.
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The
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.Fa how
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argument specifies the type of shutdown.
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Possible values are:
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.Bl -tag -width ".Dv SHUT_RDWR"
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.It Dv SHUT_RD
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Further receives will be disallowed.
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.It Dv SHUT_WR
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Further sends will be disallowed.
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This may cause actions specific to the protocol family of the socket
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.Fa s
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to happen; see
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.Sx IMPLEMENTATION NOTES .
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.It Dv SHUT_RDWR
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Further sends and receives will be disallowed.
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Implies
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.Dv SHUT_WR .
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.El
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.Pp
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If the file descriptor
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.Fa s
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is associated with a
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.Dv SOCK_STREAM
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socket, all or part of the full-duplex connection will be shut down.
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.\"
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.Sh IMPLEMENTATION NOTES
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The following protocol specific actions apply to the use of
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.Dv SHUT_WR
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(and potentially also
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.Dv SHUT_RDWR ) ,
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based on the properties of the socket associated with the file descriptor
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.Fa s .
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.Bl -column ".Dv PF_INET6" ".Dv SOCK_STREAM" ".Dv IPPROTO_SCTP"
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.It Sy Domain Ta Sy Type Ta Sy Protocol Ta Sy Return value and action
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.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
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Return \-1.
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The global variable
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.Va errno
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will be set to
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.Er EOPNOTSUPP .
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.It Dv PF_INET Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
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Return 0.
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ICMP messages will
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.Em not
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be generated.
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.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
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Return 0.
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Send queued data and tear down association.
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.It Dv PF_INET Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
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Return 0.
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Send queued data, wait for ACK, then send FIN.
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.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_SCTP Ta
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Return \-1.
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The global variable
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.Va errno
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will be set to
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.Er EOPNOTSUPP .
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.It Dv PF_INET6 Ta Dv SOCK_DGRAM Ta Dv IPPROTO_UDP Ta
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Return 0.
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ICMP messages will
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.Em not
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be generated.
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.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_SCTP Ta
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Return 0.
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Send queued data and tear down association.
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.It Dv PF_INET6 Ta Dv SOCK_STREAM Ta Dv IPPROTO_TCP Ta
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Return 0.
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Send queued data, wait for ACK, then send FIN.
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.El
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.\"
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.Sh RETURN VALUES
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.Rv -std shutdown
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.Sh ERRORS
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The
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.Fn shutdown
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system call fails if:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa s
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argument is not a valid file descriptor.
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.It Bq Er EINVAL
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The
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.Fa how
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argument is invalid.
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.It Bq Er EOPNOTSUPP
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The socket associated with the file descriptor
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.Fa s
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does not support this operation.
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.It Bq Er ENOTCONN
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The
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.Fa s
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argument specifies a
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.Dv SOCK_STREAM
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socket which is not connected.
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.It Bq Er ENOTSOCK
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The
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.Fa s
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argument does not refer to a socket.
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.El
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.Sh SEE ALSO
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.Xr connect 2 ,
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.Xr socket 2 ,
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.Xr inet 4 ,
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.Xr inet6 4
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.Sh STANDARDS
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The
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.Fn shutdown
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system call is expected to comply with
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.St -p1003.1g-2000 ,
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when finalized.
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.Sh HISTORY
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The
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.Fn shutdown
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system call appeared in
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.Bx 4.2 .
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The
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.Dv SHUT_RD , SHUT_WR ,
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and
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.Dv SHUT_RDWR
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constants appeared in
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.St -p1003.1g-2000 .
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.Sh AUTHORS
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.An -nosplit
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This manual page was updated by
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.An Bruce M. Simpson Aq bms@FreeBSD.org
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to reflect how
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.Fn shutdown
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behaves with
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.Dv PF_INET
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and
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.Dv PF_INET6
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sockets.
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.Sh BUGS
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The ICMP
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.Dq Li "port unreachable"
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message should be generated in response to
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datagrams received on a local port to which
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.Fa s
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is bound
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after
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.Fn shutdown
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is called.
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