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Re: Test exit status misinterpreted in scripts when buit without job con

From: Chet Ramey
Subject: Re: Test exit status misinterpreted in scripts when buit without job control
Date: Fri, 5 Aug 2016 15:22:43 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:45.0) Gecko/20100101 Thunderbird/45.2.0

On 8/4/16 5:04 PM, Dan Cross wrote:

>     Thanks for the report.  I took a quick look at this, and it's not 
> disabling
>     job control that does it: it's disabling both job control and nls.
>     Disabling either one while leaving the other enabled doesn't produce this
>     error (which only happens in the case where you run a script with the
>     execute bit set without a #! line after running an executable that causes
>     the shell to call waitpid()).  It's a strange set of circumstances.
>     I'll see what I can find.
> Thanks, Chet. FYI, I tried building for the research kernel with NLS
> enabled and am still seeing the problem. 

It turns out that the set of circumstances I listed above is essential,
and order-specific.  I tested in a slightly different order when I built
a version without nls and job control, and that was the sequence that
triggers the bug.  It's very specific.

Anyway, I fixed it and the fix will be in the next release.  If you
want to move forward, you can apply the attached workaround, which is not
the change I made in the current development version.


``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/

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