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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 

.Fd #include 

.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 .