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From: Johannes Sixt <j6t@kdbg.org>
To: Johannes Schindelin via GitGitGadget <gitgitgadget@gmail.com>
Cc: git@vger.kernel.org,
	Johannes Schindelin <johannes.schindelin@gmx.de>,
	Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v3 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles
Date: Mon, 2 Dec 2019 18:35:10 +0100
Message-ID: <a4ac4530-9b5c-3eb6-ada2-067c6ef73868@kdbg.org> (raw)
In-Reply-To: <pull.480.v3.git.1575286409.gitgitgadget@gmail.com>

Am 02.12.19 um 12:33 schrieb Johannes Schindelin via GitGitGadget:
> Range-diff vs v2:
> 
>  1:  280b6d08a4 = 1:  280b6d08a4 mingw: do set `errno` correctly when trying to restrict handle inheritance
>  2:  c3dea00fb1 ! 2:  e04e1269b3 mingw: translate ERROR_SUCCESS to errno = 0
>      @@ -3,12 +3,15 @@
>           mingw: translate ERROR_SUCCESS to errno = 0

The subject line would have to be adjusted as well.

	mingw: forbid translating ERROR_SUCCESS to an errno value

or something.

>       
>           Johannes Sixt pointed out that the `err_win_to_posix()` function
>      -    mishandles `ERROR_SUCCESS`. This commit fixes that.
>      +    mishandles `ERROR_SUCCESS`: it maps it to `ENOSYS`.
>       
>      -    Technically, we try to only assign `errno` to the corresponding value of
>      -    `GetLastError()` (which translation is performed by that function) when
>      -    a Win32 API call failed, so this change is purely defensive and is not
>      -    expected to fix an existing bug in our code base.
>      +    The only purpose of this function is to map Win32 API errors to `errno`
>      +    ones, and there is actually no equivalent to `ERROR_SUCCESS`: the idea
>      +    of `errno` is that it will only be set in case of an error, and left
>      +    alone in case of success.
>      +
>      +    Therefore, as pointed out by Junio Hamano, it is a bug to call this
>      +    function when there was not even any error to map.
>       
>           Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
>       
>      @@ -19,7 +22,7 @@
>        	case ERROR_SHARING_BUFFER_EXCEEDED: error = ENFILE; break;
>        	case ERROR_SHARING_VIOLATION: error = EACCES; break;
>        	case ERROR_STACK_OVERFLOW: error = ENOMEM; break;
>      -+	case ERROR_SUCCESS: error = 0; break;
>      ++	case ERROR_SUCCESS: BUG("err_win_to_posix() called without an error!");
>        	case ERROR_SWAPERROR: error = ENOENT; break;
>        	case ERROR_TOO_MANY_MODULES: error = EMFILE; break;
>        	case ERROR_TOO_MANY_OPEN_FILES: error = EMFILE; break;
> 

-- Hannes

  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   ` [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
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     ` Johannes Sixt [this message]
2019-12-02 19:04       ` [PATCH v3 0/2] Brown-bag fix on top of js/mingw-inherit-only-std-handles Junio C Hamano
2019-12-03 12:04       ` Johannes Schindelin

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