From mboxrd@z Thu Jan  1 00:00:00 1970
From: Kay Sievers <kay.sievers@vrfy.org>
Date: Thu, 08 Apr 2004 20:49:34 +0000
Subject: Re: Test script for udevd binary, Request for Comments!
Message-Id: <20040408204934.GA31601@vrfy.org>
List-Id: <linux-hotplug.vger.kernel.org>
References: <3ACA40606221794F80A5670F0AF15F84037B9188@PDSMSX403.ccr.corp.intel.com>
In-Reply-To: <3ACA40606221794F80A5670F0AF15F84037B9188@PDSMSX403.ccr.corp.intel.com>
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To: linux-hotplug@vger.kernel.org

On Thu, Apr 08, 2004 at 09:22:25AM -0700, Sabharwal, Atul wrote:
> Where is the timeout happening ?

The timeout happens if a sequence number is missing and udevd will
wait for the missing events until the timout happens and we skip the
missing sequences, you may look at 'man udevd' for a short description.

Kay

> On Wed, Apr 07, 2004 at 06:53:21PM +0800, Yin, Hu wrote:
> > Hi, All,
> >=20
> > I have written a test script for udevd binary. As you know there have
> been
> > some good test scripts for udev binary but we didn't write the
> corresponding
> > test scripts for the new udev's binaries since udev is split into
> several
> > binary program. Moreover, I think the work is necessary, especially
> for
> > udevd and udevsend binaries.
> >=20
> > Now I focus on the validation of udev as a Intel's intern student, so
> wrote
> > this test script for udevd and send it to all. I know this script is
> not
> > very good and enough for udevd's test but I believe we can do better
> with
> > the help from all of you. So please just take a look at this script
> and give
> > me some advises and suggestions in order that we can improve it
> together.
>=20
> The timout is 10 seconds now.
>=20
> It is not acceptable for a test like this, to work on the "real"
> $udev_root.
> It may render your system unusable!
>=20
> I prefer a test for udevsend/udevd only, not calling the real udev. You
> may
> change udevd to look on startup in the environment for the key UDEV_BIN
> and
> take this value instead of the real udev. Then you replace the real udev
> by
> a call to a small test program, which maybe writes a log file to be
> analyzed
> by your test script.
> This way you test the daemon only, not udev and udevd together and you
> are
> able to check if the logic for holding back events for the same device
> and
> execute different devices in parallel, works too.
>=20
> And a second time: Two events with the same sequence number are not a
> case we need to handle differently than a missing sequence number. A
> test for it is nice, but a timeout is the expected behavior.
>=20
> What do you think?
>=20
> thanks,
> Kay
>=20
>=20
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>=20
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