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Date: Mon, 27 Jun 2022 10:38:50 +0000
From: "Laurent Bercot" <ska-dietlibc@...rnet.org>
To: musl@...ts.openwall.com, "Nick Peng" <pymumu@...il.com>
Subject: Re: BUG: Calling readdir/dirfd after vfork will cause deadlock.
>We can't close all file handles by iterating over all file handles
>number, because the maximum number of files limit is set very large,
>the performance of this method is too poor.
>And we can't use fork, fork will fail because of vm.overcommit_memory.
>In order to optimize this, the method we used is to read the file
>handes in /proc/self/fd directory and close the file handles one by
>one.
This may be a rare instance where close_range(2) is useful, if you
don't mind being restricted to Linux (>= 5.9) and FreeBSD.
https://man7.org/linux/man-pages/man2/close_range.2.html
--
Laurent
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