.\" $OpenBSD: shutdown.2,v 1.9 2000/08/09 12:57:54 aaron Exp $
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.\" $OpenBSD: shutdown.2,v 1.9 2000/08/09 12:57:54 aaron Exp $
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.\" $NetBSD: shutdown.2,v 1.5 1995/02/27 12:37:11 cgd Exp $
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.\" $NetBSD: shutdown.2,v 1.5 1995/02/27 12:37:11 cgd Exp $
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.\"
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.\"
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.\" Copyright (c) 1983, 1991, 1993
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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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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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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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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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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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.\" 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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.\" 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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.\" 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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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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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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.\" 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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.\" without specific prior written permission.
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.\"
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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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.\" 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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.\" 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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.\" 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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.\" 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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.\" 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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.\" 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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.\" 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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.\" 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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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\" SUCH DAMAGE.
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.\"
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.\"
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.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93
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.\" @(#)shutdown.2 8.1 (Berkeley) 6/4/93
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.\"
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.\"
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.Dd June 4, 1993
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.Dd June 4, 1993
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.Dt SHUTDOWN 2
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.Dt SHUTDOWN 2
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.Os
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.Os
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.Sh NAME
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.Sh NAME
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.Nm shutdown
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.Nm shutdown
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.Nd shut down part of a full-duplex connection
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.Nd shut down part of a full-duplex connection
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.Sh SYNOPSIS
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.Sh SYNOPSIS
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.Fd #include
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.Fd #include
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.Fd #include
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.Fd #include
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.Ft int
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.Ft int
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.Fn shutdown "int s" "int how"
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.Fn shutdown "int s" "int how"
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.Sh DESCRIPTION
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.Sh DESCRIPTION
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The
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The
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.Fn shutdown
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.Fn shutdown
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call causes all or part of a full-duplex connection on
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call causes all or part of a full-duplex connection on
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the socket associated with
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the socket associated with
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.Fa s
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.Fa s
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to be shut down.
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to be shut down.
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If
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If
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.Fa how
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.Fa how
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is
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is
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.Ar SHUT_RD ,
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.Ar SHUT_RD ,
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further receives will be disallowed.
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further receives will be disallowed.
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If
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If
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.Fa how
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.Fa how
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is
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is
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.Ar SHUT_WR ,
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.Ar SHUT_WR ,
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further sends will be disallowed.
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further sends will be disallowed.
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If
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If
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.Fa how
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.Fa how
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is
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is
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.Ar SHUT_RDWR ,
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.Ar SHUT_RDWR ,
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further sends and receives will be disallowed.
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further sends and receives will be disallowed.
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.Sh RETURN VALUES
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.Sh RETURN VALUES
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A 0 is returned if the call succeeds, \-1 if it fails.
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A 0 is returned if the call succeeds, \-1 if it fails.
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.Sh ERRORS
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.Sh ERRORS
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The call succeeds unless:
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The call succeeds unless:
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.Bl -tag -width Er
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.Bl -tag -width Er
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.It Bq Er EINVAL
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.It Bq Er EINVAL
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.Fa how
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.Fa how
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is not
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is not
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.Ar SHUT_RD ,
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.Ar SHUT_RD ,
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.Ar SHUT_WR ,
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.Ar SHUT_WR ,
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or
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or
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.Ar SHUT_RDWR .
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.Ar SHUT_RDWR .
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.It Bq Er EBADF
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.It Bq Er EBADF
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.Fa s
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.Fa s
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is not a valid descriptor.
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is not a valid descriptor.
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.It Bq Er ENOTSOCK
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.It Bq Er ENOTSOCK
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.Fa s
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.Fa s
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is a file, not a socket.
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is a file, not a socket.
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.It Bq Er ENOTCONN
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.It Bq Er ENOTCONN
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The specified socket is not connected.
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The specified socket is not connected.
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.El
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.El
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.Sh SEE ALSO
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.Sh SEE ALSO
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.Xr connect 2 ,
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.Xr connect 2 ,
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.Xr socket 2
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.Xr socket 2
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.Sh HISTORY
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.Sh HISTORY
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The
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The
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.Fn shutdown
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.Fn shutdown
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function call appeared in
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function call appeared in
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.Bx 4.2 .
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.Bx 4.2 .
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The
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The
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.Fa how
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.Fa how
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arguments used to be simply 0, 1, and 2, but now have named values
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arguments used to be simply 0, 1, and 2, but now have named values
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as specified by
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as specified by
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.St -xpg4 .
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.St -xpg4 .
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