.\"	$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 March 18, 2015
.Dt SHUTDOWN 2
.Os BSD 4.2
.Sh NAME
.Nm shutdown
.Nd shut down part of a full-duplex connection
.Sh SYNOPSIS
.Fd #include <sys/socket.h>
.Ft int
.Fo shutdown
.Fa "int socket"
.Fa "int how"
.Fc
.Sh DESCRIPTION
The
.Fn shutdown
call causes all or part of a full-duplex connection on
the socket associated with
.Fa socket
to be shut down.
If
.Fa how
is 
.Dv SHUT_RD ,
further receives will be disallowed.
If
.Fa how
is 
.Dv SHUT_WR ,
further sends will be disallowed.
If
.Fa how
is 
.Dv SHUT_RDWR ,
further sends and receives will be disallowed.
.Sh RETURN VALUES
.Rv -std shutdown
.Sh ERRORS
The call succeeds unless:
.Bl -tag -width Er
.\" ===========
.It Bq Er EBADF
.Fa Socket
is not a valid descriptor.
.\" ===========
.It Bq Er EINVAL
The
.Fa how
argument is invalid.
.\" ===========
.It Bq Er ENOTCONN
The specified socket is not connected.
.\" ===========
.It Bq Er ENOTSOCK
.Fa Socket
is a file, not a socket.
.El
.Sh SEE ALSO
.Xr connect 2 ,
.Xr connectx 2 ,
.Xr disconnectx 2 ,
.Xr socket 2
.Sh HISTORY
The
.Fn shutdown
function call appeared in
.Bx 4.2 .