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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 $
.\"
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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 .