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
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