From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <f88ed432d6a122022362c3a216aa861c@terzarima.net>
From: Charles Forsyth <forsyth@terzarima.net>
Date: Tue, 31 Aug 2010 00:22:52 +0100
To: 9fans@9fans.net
In-Reply-To: <AANLkTi=5M04hmDaPjezyzaJm_mEGCoExpYCB9-xVpFAK@mail.gmail.com>
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Subject: Re: [9fans] P9p on Fedora 12
Topicbox-Message-UUID: 4ae65a22-ead6-11e9-9d60-3106f5b1d025

in rcinputproc
		s = setecho(sfd, 0);
		if(write(rcfd, pair.s, pair.ns) < 0)
			threadexitsall(nil);
		if(s)
			setecho(sfd, s);

there's a race between setting echo off, writing to rcfd, resetting echo and
the reader of the other side of rcfd. a sleep(1) before if(s) makes it less frequent
because the reader gets to read the data in the right mode.
i haven't really looked at what linux is doing that allows that,
or what changed between revisions.

it's not my observation, it was on a list or issue comment somewhere,
presumably for p9p. i can't find the bookmark.