.\"
.\" Copyright (c) 2006 The DragonFly Project.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in
.\"    the documentation and/or other materials provided with the
.\"    distribution.
.\" 3. Neither the name of The DragonFly Project nor the names of its
.\"    contributors may be used to endorse or promote products derived
.\"    from this software without specific, prior written permission.
.\" 
.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
.\" LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
.\" FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
.\" COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
.\" BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
.\" AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
.\" OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
.\" OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $DragonFly: src/lib/libc/sys/caps_sys_reply.2,v 1.1 2006/02/28 22:40:49 swildner Exp $
.\"
.Dd February 28, 2006
.Dt CAPS_SYS_REPLY 2
.Os
.Sh NAME
.Nm caps_sys_reply
.Nd reply to a CAPS IPC message
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/caps.h
.Ft int
.Fn caps_sys_reply "int portid" "const void *msg" "int msgsize" "off_t msgid"
.Sh DESCRIPTION
Reply to the received CAPS message identified by
.Fa msgid
on the port specified by
.Fa portid .
The reply may supply opaque data in
.Fa msg .
The memory associated with the message must be left intact until
an acknowledgement is returned at a later time.
The kernel does not make a copy of the message and its size may not
exceed 128KB.
.Pp
This function is only used on the server side.
The server may reply to a message without retrieving its data.
.Sh RETURN VALUES
.Rv -std caps_sys_reply
.Sh ERRORS
This function will fail if:
.Bl -tag -width ".Bq Er ENOTCONN"
.It Bq Er EINVAL
An invalid argument was specified.
.It Bq Er ENOTCONN
The process originally creating the port forked and the child
process attempts to access the port.
The child process is expected to create its own port.
This error is also returned if the remote end closed its connection
and is no longer available.
Note that a child process may not reply to a message received by its
parent.
.El
.Sh SEE ALSO
.Xr caps_sys_client 2 ,
.Xr caps_sys_get 2 ,
.Xr caps_sys_put 2 ,
.Xr caps_sys_service 2
.Sh HISTORY
The
.Fn caps_sys_reply
function call first appeared in
.Dx 1.0 .
.Sh AUTHORS
.An -nosplit
CAPS IPC was written by
.An Matthew Dillon .
This man page was written by
.An Sascha Wildner .