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From: Junio C Hamano <gitster@pobox.com>
To: "Johannes Schindelin via GitGitGadget" <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org, Johannes Sixt <j6t@kdbg.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 10:04:29 -0800
Message-ID: <xmqq5zj12qc2.fsf@gitster-ct.c.googlers.com> (raw)
In-Reply-To: <pull.480.v2.git.1575110200.gitgitgadget@gmail.com> (Johannes Schindelin via GitGitGadget's message of "Sat, 30 Nov 2019 10:36:38 +0000")

"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.

>  * For good measure, we teach the err_win_to_posix() function to translate 
>    ERROR_SUCCESS into the errno value 0.

So, I am not sure if this is a good idea---who are the callers of
this function and why do they call it?  I would imagine that a
caller who makes a system call, upon seeing a failure from the
system call, calls this helper with the Windows error code it
received from the system call so that errno can be updated with a
POSIXy value.  If my imagination is correct, such a caller should
not be assigning anything to errno if the underlying system call
succeeds, i.e. returns ERROR_SUCCESS.  So a better solution might
be for the function to BUG() when fed ERROR_SUCCESS to point fingers
at the caller, no?

If my imagination is not correct, then ignore the whole paragraph
above ;-).

Thanks.

  parent 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   ` Junio C Hamano [this message]
2019-11-30 19:13     ` [PATCH v2 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles Johannes Sixt
2019-11-30 20:11       ` Andreas Schwab
2019-11-30 20:23         ` Junio C Hamano
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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