From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@9fans.net
From: =?UTF-8?Q?Maur=C3=ADcio?= CA <mauricio.antunes@gmail.com>
Date: Mon, 25 Apr 2011 03:14:07 +0000
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	<ip1l97$naq$1@dough.gmane.org>
	<20110424171741.D5865B827@mail.bitblocks.com>
	<ip2egi$83e$1@dough.gmane.org> <20110425020029.GA29551@dinah>
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Subject: Re: [9fans] Different results for the same rc script when using
	listen1
Topicbox-Message-UUID: d468a2c8-ead6-11e9-9d60-3106f5b1d025

> It fails on my Linux machine also.  It's because an rfork with RFNOWAIT
> sets up a child proc that will ignore SIGCHLD.  If the program that
> is executed (in this case rc) calls fork or exec all SIGCHLD signals
> will be ignored, see signal(7).
>
> Ultimately, this causes rc to set status='' for every process it forks.
> That's why all those tests are returning true.

Instead of assuming status='' for every process, rc seems to be just
ignoring process status and keeping the $status value it already had. See
this example, exactly like what I used before, but with a pattern test
that set status to 'no match':

   #!/usr/local/plan9/bin/9 rc
   ~ 1 2
   for (i in `{seq 1 5}){
       if (test $i -eq 3) {
           echo $i equals 3
       }
       if not echo $i is different from 3
   }

Now, instead of true for every step, we have false:

   $ dial 'tcp!localhost!8080'
   1 is different from 3
   2 is different from 3
   3 is different from 3
   4 is different from 3
   5 is different from 3

Thanks,

Maurício