From: Jeff King <peff@peff.net>
To: Thomas Rast <trast@student.ethz.ch>
Cc: Junio C Hamano <gitster@pobox.com>,
git@vger.kernel.org, Johannes Sixt <j6t@kdbg.org>,
Alexander Potashev <aspotashev@gmail.com>
Subject: Re: [PATCH v3 1/3] Introduce die_errno() that appends strerror(errno) to die()
Date: Tue, 9 Jun 2009 04:53:28 -0400 [thread overview]
Message-ID: <20090609085328.GA25721@coredump.intra.peff.net> (raw)
In-Reply-To: <200906091022.31738.trast@student.ethz.ch>
On Tue, Jun 09, 2009 at 10:22:30AM +0200, Thomas Rast wrote:
> > Aren't you assuming that strerror(errno) has no '%'-signs here, which is
> > what kicked off the whole discussion?
>
> True, of course. Hrm.
>
> So do we go back to v2 (for 1/3) and ask future callers to never use
> custom formats with die_errno, or should I write a version that
> doubles the % characters while tacking the error message onto the
> format?
Personally, I think it is fine to assume that the format and arguments
to die(), die_errno(), and to the die_routine() are all
printf-compatible. That is how it has always been until now, and I don't
see any callers who would want to change that.
This is all internal to git. It's not as if we are talking about a
library being called by arbitrary code, and we want to leave doors open
for arbitrary clients. libgit2 would probably take a different approach
(though I imagine their general strategy is never to die(), but to
always return an error condition, anyway).
> [It's a pity that it seems impossible to add an extra argument to the
> va_args...]
Agreed, but I think we are out of luck short of variadic macros (which
are a C99-ism, and even then have some issues).
-Peff
next prev parent reply other threads:[~2009-06-09 8:53 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-02 21:34 [PATCH] add strerror(errno) to die() calls where applicable Thomas Rast
2009-06-03 1:55 ` Jeff King
[not found] ` <2325a7950906031855t1977448lbb1c8aa671c72f3d@mail.gmail.com>
2009-06-04 1:58 ` Alexander Potashev
2009-06-04 20:32 ` Jeff King
2009-06-04 2:05 ` [PATCH] diesys calls die and also reports strerror(errno) Alexander Potashev
2009-06-04 20:50 ` Jeff King
2009-06-04 21:13 ` Junio C Hamano
2009-06-05 6:25 ` Johannes Sixt
2009-06-05 7:12 ` Junio C Hamano
2009-06-06 22:09 ` Jeff King
2009-06-06 13:09 ` [PATCH] add strerror(errno) to die() calls where applicable Thomas Rast
2009-06-06 14:44 ` [PATCH v2 0/3] Thomas Rast <trast@student.ethz.ch> Thomas Rast
2009-06-08 21:02 ` [PATCH v3 0/3] die_errno() Thomas Rast
2009-06-27 15:58 ` [PATCH v4 0/4] die_errno() Thomas Rast
2009-06-27 15:58 ` [PATCH v4 1/4] Introduce die_errno() that appends strerror(errno) to die() Thomas Rast
2009-06-27 15:58 ` [PATCH v4 2/4] die_errno(): double % in strerror() output just in case Thomas Rast
2009-06-27 15:58 ` [PATCH v4 3/4] Convert existing die(..., strerror(errno)) to die_errno() Thomas Rast
2009-06-27 15:58 ` [PATCH v4 4/4] Use die_errno() instead of die() when checking syscalls Thomas Rast
2009-06-27 18:38 ` [PATCH v4 0/4] die_errno() Junio C Hamano
2009-06-08 21:02 ` [PATCH v3 1/3] Introduce die_errno() that appends strerror(errno) to die() Thomas Rast
2009-06-08 22:07 ` Jeff King
2009-06-09 8:22 ` Thomas Rast
2009-06-09 8:53 ` Jeff King [this message]
2009-06-09 9:29 ` Andreas Ericsson
2009-06-08 21:02 ` [PATCH v3 2/3] Convert existing die(..., strerror(errno)) to die_errno() Thomas Rast
2009-06-08 21:02 ` [PATCH v3 3/3] Use die_errno() instead of die() when checking syscalls Thomas Rast
2009-06-06 14:44 ` [PATCH v2 1/3] Introduce die_errno() that appends strerror(errno) to die() Thomas Rast
2009-06-06 20:36 ` Johannes Sixt
2009-06-06 20:56 ` Thomas Rast
2009-06-06 21:17 ` Johannes Sixt
2009-06-06 22:47 ` Jeff King
2009-06-06 22:13 ` Jeff King
2009-06-07 11:12 ` Alexander Potashev
2009-06-07 16:57 ` Junio C Hamano
2009-06-08 12:36 ` Jeff King
2009-06-08 15:35 ` Alexander Potashev
2009-06-08 22:04 ` Jeff King
2009-06-06 14:44 ` [PATCH v2 2/3] Convert existing die(..., strerror(errno)) to die_errno() Thomas Rast
2009-06-06 20:31 ` Johannes Sixt
2009-06-06 14:44 ` [PATCH v2 3/3] Use die_errno() instead of die() when checking syscalls Thomas Rast
2009-06-06 21:02 ` Johannes Sixt
2009-06-06 22:27 ` Thomas Rast
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: http://vger.kernel.org/majordomo-info.html
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20090609085328.GA25721@coredump.intra.peff.net \
--to=peff@peff.net \
--cc=aspotashev@gmail.com \
--cc=git@vger.kernel.org \
--cc=gitster@pobox.com \
--cc=j6t@kdbg.org \
--cc=trast@student.ethz.ch \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://80x24.org/mirrors/git.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).