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From: "Laurent Bercot" <ska-dietlibc@skarnet.org>
To: musl@lists.openwall.com, "Nick Peng" <pymumu@gmail.com>
Subject: Re: [musl] BUG: Calling readdir/dirfd after vfork will cause deadlock.
Date: Mon, 27 Jun 2022 10:38:50 +0000	[thread overview]
Message-ID: <emc91ce971-df60-4e97-8968-a400415c3933@d006be6d.com> (raw)
In-Reply-To: <CALkM5nttiPx75y3SZeGfh65LG_e7vngPNnY4KyHttO0qR-R3og@mail.gmail.com>

>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


  reply	other threads:[~2022-06-27 10:39 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-25  3:40 Nick Peng
2022-06-25 12:51 ` Szabolcs Nagy
2022-06-27  4:05   ` Nick Peng
2022-06-27 10:38     ` Laurent Bercot [this message]
2022-06-27 14:21     ` Rich Felker
2022-06-27 14:29     ` Markus Wichmann
2022-06-27  7:42   ` Florian Weimer
2022-06-27  8:37     ` Szabolcs Nagy
2022-06-27  9:23       ` Florian Weimer
2022-06-27 17:33         ` Szabolcs Nagy
2022-06-25 12:56 ` Alex Xu (Hello71)
2022-06-27  7:44   ` Florian Weimer
2022-06-27 12:28     ` Alex Xu (Hello71)

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