Matthew,

What alternative would you suggest?

From an earlier email:

...nothing else addresses the underlying issue: there is no way to
prevent a fork() from duplicating the resource. The close-on-exec
flag partially-addresses this by allowing the parent process to
mark a file descriptor as exclusive to itself, but there is still
a period of time the failure can occur because the auto-close only
occurs during the exec(). Perhaps this would not be an issue with
a different process/threading model, but that is another discussion
entirely.

Do you disagree there is an issue?

-----Original Message-----
From: Matthew Wilcox <willy@infradead.org>
Sent: Friday, May 15, 2020 10:58
To: Karstens, Nate <redacted>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>; Jeff Layton <jlayton@kernel.org>; J. Bruce Fields <redacted>; Arnd Bergmann <arnd@arndb.de>; Richard Henderson <redacted>; Ivan Kokshaysky <redacted>; Matt Turner <mattst88@gmail.com>; James E.J. Bottomley <James.Bottomley@hansenpartnership.com>; Helge Deller <deller@gmx.de>; David S. Miller <davem@davemloft.net>; Jakub Kicinski <kuba@kernel.org>; Eric Dumazet <edumazet@google.com>; David Laight <redacted>; linux-fsdevel@vger.kernel.org; linux-arch@vger.kernel.org; linux-alpha@vger.kernel.org; linux-parisc@vger.kernel.org; sparclinux@vger.kernel.org; netdev@vger.kernel.org; linux-kernel@vger.kernel.org; Changli Gao <redacted>; a.josey@opengroup.org
Subject: Re: [PATCH v2] Implement close-on-fork

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On Fri, May 15, 2020 at 10:23:17AM -0500, Nate Karstens wrote:

Series of 4 patches to implement close-on-fork. Tests have been
published to https://github.com/nkarstens/ltp/tree/close-on-fork
and cover close-on-fork functionality in the following syscalls:

[...]

This functionality was approved by the Austin Common Standards
Revision Group for inclusion in the next revision of the POSIX
standard (see issue 1318 in the Austin Group Defect Tracker).

NAK to this patch series, and the entire concept.

Is there a way to persuade POSIX that they made a bad decision by standardising this mess?

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