GNU bug report logs - #33965
handling of closed file descriptors

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From: Bruno Haible <bruno <at> clisp.org>
To: 33965 <at> debbugs.gnu.org
Subject: bug#33965: handling of closed file descriptors
Date: Thu, 03 Jan 2019 20:42:28 +0100

[Message part 1 (text/plain, inline)]

There is a problem with the handling of closed file descriptors
in diff-3.7: As mentioned in [1], the 'new-file' test fails on HP-UX.
An investigation [2] shows that different coding techniques are needed,
depending on the desired outcome for closed file descriptors.

This patch uses a variant of (A) from [2]. Namely, the result of fcntl
can apparently be used to distinguish the substitute file descriptor
stuffed in by exec() from a regular open("/dev/null",O_RDONLY).

[1] https://lists.gnu.org/archive/html/diffutils-devel/2018-12/msg00019.html
[2] https://lists.gnu.org/archive/html/bug-gnulib/2019-01/msg00012.html

[0001-Recognize-file-descriptors-closed-by-the-parent-proc.patch (text/x-patch, attachment)]

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