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-.\" $OpenBSD: nchan2.ms,v 1.3 2003/11/21 11:57:03 djm Exp $
-.\"
-.\" Copyright (c) 2000 Markus Friedl. 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.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
-.\"
-.TL
-OpenSSH Channel Close Protocol 2.0 Implementation
-.SH
-Channel Input State Diagram
-.PS
-reset
-l=1
-s=1.2
-ellipsewid=s*ellipsewid
-boxwid=s*boxwid
-ellipseht=s*ellipseht
-S1: ellipse "INPUT" "OPEN"
-move right 2*l from last ellipse.e
-S3: ellipse invis
-move down l from last ellipse.s
-S4: ellipse "INPUT" "CLOSED"
-move down l from 1st ellipse.s
-S2: ellipse "INPUT" "WAIT" "DRAIN"
-arrow from S1.e to S4.n
-box invis "rcvd CLOSE/" "shutdown_read" with .sw at last arrow.c
-arrow "ibuf_empty ||" "rcvd CLOSE/" "send EOF" "" from S2.e to S4.w
-arrow from S1.s to S2.n
-box invis "read_failed/" "shutdown_read" with .e at last arrow.c
-ellipse wid .9*ellipsewid ht .9*ellipseht at S4
-arrow "start" "" from S1.w+(-0.5,0) to S1.w
-.PE
-.SH
-Channel Output State Diagram
-.PS
-S1: ellipse "OUTPUT" "OPEN"
-move right 2*l from last ellipse.e
-S3: ellipse invis
-move down l from last ellipse.s
-S4: ellipse "OUTPUT" "CLOSED"
-move down l from 1st ellipse.s
-S2: ellipse "OUTPUT" "WAIT" "DRAIN"
-arrow from S1.e to S4.n
-box invis "write_failed/" "shutdown_write" with .sw at last arrow.c
-arrow "obuf_empty ||" "write_failed/" "shutdown_write" "" from S2.e to S4.w
-arrow from S1.s to S2.n
-box invis "rcvd EOF ||" "rcvd CLOSE/" "-" with .e at last arrow.c
-ellipse wid .9*ellipsewid ht .9*ellipseht at S4
-arrow "start" "" from S1.w+(-0.5,0) to S1.w
-.PE
-.SH
-Notes
-.PP
-The input buffer is filled with data from the socket
-(the socket represents the local consumer/producer of the
-forwarded channel).
-The data is then sent over the INPUT-end (transmit-end) of the channel to the
-remote peer.
-Data sent by the peer is received on the OUTPUT-end (receive-end),
-saved in the output buffer and written to the socket.
-.PP
-If the local protocol instance has forwarded all data on the
-INPUT-end of the channel, it sends an EOF message to the peer.
-.PP
-A CLOSE message is sent to the peer if
-both the INPUT- and the OUTOUT-half of the local
-end of the channel are closed.
-.PP
-The channel can be deallocated by a protocol instance
-if a CLOSE message he been both sent and received.
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