GNU bug report logs - #18592
FFI should have portable access to ‘errno’

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Mark H Weaver <mhw <at> netris.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#18592: closed (FFI should have portable access to
 ‘errno’)
Date: Mon, 20 Jun 2016 19:56:01 +0000

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Your message dated Mon, 20 Jun 2016 15:55:21 -0400
with message-id <87eg7rtz2u.fsf <at> netris.org>
and subject line Re: bug#18592: FFI should have portable access to ‘errno’
has caused the debbugs.gnu.org bug report #18592,
regarding FFI should have portable access to ‘errno’
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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18592: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=18592
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From: Frank Terbeck <ft <at> bewatermyfriend.org>
To: bug-guile <at> gnu.org
Subject: FFI should have portable access to ‘errno’
Date: Tue, 30 Sep 2014 22:17:04 +0200

Hello Guile Maintainers!

When accessing POSIX functions from a system's libc via Guile's dynamic
FFI, you commonly want to access the ‘errno’ variable to be able to
produce useful diagnostic messages.

Currently there's no such access built-in.

Mark Weaver on IRC thought it would be a good idea to add portable
access to the contents of ‘errno’ (however it's actually implemented) to
Guile's FFI. And now the idea has entered the bug tracker. :)


Regards, Frank

-- 
In protocol design, perfection has been reached not when there is
nothing left to add, but when there is nothing left to take away.
                                                  -- RFC 1925

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From: Mark H Weaver <mhw <at> netris.org>
To: Nala Ginrut <nalaginrut <at> gmail.com>
Cc: 18592-done <at> debbugs.gnu.org
Subject: Re: bug#18592: FFI should have portable access to ‘errno’
Date: Mon, 20 Jun 2016 15:55:21 -0400

Mark H Weaver <mhw <at> netris.org> writes:

> Nala Ginrut <nalaginrut <at> gmail.com> writes:
>
>> Is there still problem? I'm fine with the patch, and I'm expecting to
>> merge it ASAP. Anyway, please don't hesitate to tell me if there's still
>> any problem, I'm glad to help to do it better. I really need it.
>
> Sorry for the delay, but I'm having second thoughts about whether this
> is the right approach.  Perhaps we should instead make a set of
> commitments that certain basic operations like scheme evaluation, heap
> allocation, and basic scheme procedures will leave 'errno' unchanged.

Okay, I finally decided to go ahead and add 'errno' support to the FFI
directly.  Pushed in commit ee3381c94d389d923591dcb610bac9ecfd68e6a4 to
stable-2.0.  If you could make sure it works for your use cases, I'd be
grateful.

I'm closing this bug now, but feel free to reopen if there are issues.

      Thanks,
        Mark

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