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From: Junio C Hamano <gitster@pobox.com>
To: Andreas Schwab <schwab@linux-m68k.org>
Cc: Johannes Sixt <j6t@kdbg.org>,
	Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>,
	git@vger.kernel.org,
	Johannes Schindelin <johannes.schindelin@gmx.de>
Subject: Re: [PATCH v2 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles
Date: Sat, 30 Nov 2019 12:23:20 -0800
Message-ID: <xmqqwobh15c7.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <8736e5t98b.fsf@igel.home> (Andreas Schwab's message of "Sat, 30 Nov 2019 21:11:48 +0100")

Andreas Schwab <schwab@linux-m68k.org> writes:

> On Nov 30 2019, Johannes Sixt wrote:
>
>> Am 30.11.19 um 19:04 schrieb Junio C Hamano:
>>> "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
>>> writes:
>>> 
>>>>  * We now assign errno only when the call to CreateProcessW() failed.
>>> 
>>> Meaning the global variable 'errno' is left as it was (instead of
>>> getting cleared) when a system call succeeds?  That I think is the
>>> correct behaviour people who use the variable expect.
>>
>> I hope you mean people who read the code. You cannot possibly mean
>> developers who expect that the run-command API keeps errno unchanged if
>> the calls were successful. I'm pretty sure they do not provide such a
>> guarantee.
>
> POSIX guarantees that no library function sets errno to zero.

It is true, but the rest of the Git code works on top of an
abstraction a bit higher than C/POSIX library.  The run-command API
J6t cites is an example.

IOW, we cannot take advantage of that POSIX guarantee in the
codepaths that use our internal API.  So...


  reply index

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-11-29 21:44 [PATCH 0/1] " Johannes Schindelin via GitGitGadget
2019-11-29 21:44 ` [PATCH 1/1] mingw: do set `errno` correctly when trying to restrict handle inheritance Johannes Schindelin via GitGitGadget
2019-11-29 23:02   ` Johannes Sixt
2019-11-30 22:06     ` Johannes Schindelin
2019-11-30 22:16       ` Johannes Sixt
2019-11-30 10:36 ` [PATCH v2 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles Johannes Schindelin via GitGitGadget
2019-11-30 10:36   ` [PATCH v2 1/2] mingw: do set `errno` correctly when trying to restrict handle inheritance Johannes Schindelin via GitGitGadget
2019-11-30 10:36   ` [PATCH v2 2/2] mingw: translate ERROR_SUCCESS to errno = 0 Johannes Schindelin via GitGitGadget
2019-11-30 18:04   ` [PATCH v2 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles Junio C Hamano
2019-11-30 19:13     ` Johannes Sixt
2019-11-30 20:11       ` Andreas Schwab
2019-11-30 20:23         ` Junio C Hamano [this message]
2019-11-30 20:43           ` Andreas Schwab
2019-11-30 21:22             ` Johannes Schindelin
2019-11-30 20:21       ` Junio C Hamano
2019-12-01  6:26         ` Junio C Hamano
2019-12-01  9:53           ` Johannes Schindelin
2019-12-02  6:07             ` Junio C Hamano
2019-12-02  9:05               ` Johannes Schindelin
2019-11-30 19:20   ` Johannes Sixt
2019-11-30 22:09     ` Junio C Hamano
2019-12-02 11:33   ` [PATCH v3 " Johannes Schindelin via GitGitGadget
2019-12-02 11:33     ` [PATCH v3 1/2] mingw: do set `errno` correctly when trying to restrict handle inheritance Johannes Schindelin via GitGitGadget
2019-12-02 11:33     ` [PATCH v3 2/2] mingw: translate ERROR_SUCCESS to errno = 0 Johannes Schindelin via GitGitGadget
2019-12-02 17:35     ` [PATCH v3 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles Johannes Sixt
2019-12-02 19:04       ` Junio C Hamano
2019-12-03 12:04       ` Johannes Schindelin

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