From mboxrd@z Thu Jan  1 00:00:00 1970
Date: Fri, 13 Oct 1995 09:27:38 -0400
From: td@plan9.att.com td@plan9.att.com
Subject: Panel + forks + postnote
Topicbox-Message-UUID: 2db43fea-eac8-11e9-9e20-41e7f4b1d025
Message-ID: <19951013132738.-Wi6XJME2Ykk8u4lb50Yk6MTluSOy4mun9DT5-RB_MA@z>

plan9.cs.su.oz.au!beto asks:
>I'm having problems after killing processes with
>the panel library. It looks like there is some kind of
>sincronization program, I'm not quite sure what's going on.
>The error is 
>	bitblt: bad slave 32 on event pipe: fd out of
>	range or not open

I believe the problem is that when you execute
	postnote(PNGROUP, getpid(), "kill\n");
after having done
	einit(Emouse);
that you're killing the process that's reading the
mouse.  Ironically, this postnote appears not to
terminate the processes that you started by calling
filter.  At least, it didn't work when I tried it on
my nextstation.