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.\"     $OpenBSD: shutdown.2,v 1.9 2000/08/09 12:57:54 aaron Exp $
.\"     $NetBSD: shutdown.2,v 1.5 1995/02/27 12:37:11 cgd Exp $
.\"
.\" Copyright (c) 1983, 1991, 1993
.\"     The Regents of the University of California.  All rights reserved.
.\"
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.\" modification, are permitted provided that the following conditions
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.\"     This product includes software developed by the University of
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.\" 4. 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.
.\"
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.\"
.\"     @(#)shutdown.2  8.1 (Berkeley) 6/4/93
.\"
.Dd June 4, 1993
.Dt SHUTDOWN 2
.Os
.Sh NAME
.Nm shutdown
.Nd shut down part of a full-duplex connection
.Sh SYNOPSIS
.Fd #include <sys/types.h>
.Fd #include <sys/socket.h>
.Ft int
.Fn shutdown "int s" "int how"
.Sh DESCRIPTION
The
.Fn shutdown
call causes all or part of a full-duplex connection on
the socket associated with
.Fa s
to be shut down.
If
.Fa how
is
.Ar SHUT_RD ,
further receives will be disallowed.
If
.Fa how
is
.Ar SHUT_WR ,
further sends will be disallowed.
If
.Fa how
is
.Ar SHUT_RDWR ,
further sends and receives will be disallowed.
.Sh RETURN VALUES
A 0 is returned if the call succeeds, \-1 if it fails.
.Sh ERRORS
The call succeeds unless:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa how
is not
.Ar SHUT_RD ,
.Ar SHUT_WR ,
or
.Ar SHUT_RDWR .
.It Bq Er EBADF
.Fa s
is not a valid descriptor.
.It Bq Er ENOTSOCK
.Fa s
is a file, not a socket.
.It Bq Er ENOTCONN
The specified socket is not connected.
.El
.Sh SEE ALSO
.Xr connect 2 ,
.Xr socket 2
.Sh HISTORY
The
.Fn shutdown
function call appeared in
.Bx 4.2 .
The
.Fa how
arguments used to be simply 0, 1, and 2, but now have named values
as specified by
.St -xpg4 .

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