From: Martin Pitt <martin.pitt@ubuntu.com>
To: linux-hotplug@vger.kernel.org
Subject: Re: udev: Why non-blocking poll() with blocking recvmsg()?
Date: Mon, 19 Aug 2013 12:15:59 +0000 [thread overview]
Message-ID: <20130819121559.GG3077@piware.de> (raw)
In-Reply-To: <201308192039.ACD60413.HFOQSFtLFMOJVO@I-love.SAKURA.ne.jp>
Hello Tetsuo,
Tetsuo Handa [2013-08-19 20:39 +0900]:
> I'm experiencing a boot failure problem with wait-for-root utility in Ubuntu 12.04.
Note that this is an Ubuntu specific program.
> Although wait-for-root uses blocking socket, udev_monitor_receive_device() sometimes
> immediately returns NULL.
It *assumed* a blocking socket, but didn't make sure that it actually
was. Originally libudev used blocking sockets, but at some point [1]
this was switched to non-blocking by default, and wait-for-root needed
to be adjusted to that. Please see https://launchpad.net/bugs/1154813,
it's fixed in newer Ubuntu releases.
[1] http://git.kernel.org/cgit/linux/hotplug/udev.git/commit/?id\x13d83b8
Martin
--
Martin Pitt | http://www.piware.de
Ubuntu Developer (www.ubuntu.com) | Debian Developer (www.debian.org)
next prev parent reply other threads:[~2013-08-19 12:15 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-08-19 11:39 udev: Why non-blocking poll() with blocking recvmsg()? Tetsuo Handa
2013-08-19 12:15 ` Martin Pitt [this message]
2013-08-19 12:37 ` Tetsuo Handa
2013-08-19 12:45 ` Kay Sievers
2013-08-19 13:24 ` Tetsuo Handa
2013-08-23 12:48 ` Tetsuo Handa
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20130819121559.GG3077@piware.de \
--to=martin.pitt@ubuntu.com \
--cc=linux-hotplug@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).