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upstream: add a comment describing the ranges of channel IDs that

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we use; requested by markus@

OpenBSD-Commit-ID: 83a1f09810ffa3a96a55fbe32675b34ba739e56b
This commit is contained in:
djm@openbsd.org 2020-01-25 22:49:38 +00:00 committed by Damien Miller
parent 69334996ae
commit 065064fcf4
1 changed files with 9 additions and 1 deletions
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10
channels.h
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@ -1,4 +1,4 @@
/* $OpenBSD: channels.h,v 1.132 2018/10/04 00:10:11 djm Exp $ */
/* $OpenBSD: channels.h,v 1.133 2020/01/25 22:49:38 djm Exp $ */
/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
@ -105,8 +105,16 @@ struct channel_connect {
/* Callbacks for mux channels back into client-specific code */
typedef int mux_callback_fn(struct ssh *, struct Channel *);
/*
* NB. channel IDs on the wire and in c->remote_id are uint32, but local
* channel IDs (e.g. c->self) only ever use the int32 subset of this range,
* because we use local channel ID -1 for housekeeping. Remote channels have
* a dedicated "have_remote_id" flag to indicate their validity.
*/
struct Channel {
int type; /* channel type/state */
int self; /* my own channel identifier */
uint32_t remote_id; /* channel identifier for remote peer */
int have_remote_id; /* non-zero if remote_id is valid */