Re: hotplug and test and set

[Kay Sievers <kay.sievers@vrfy.org>]

On Sun, 2005-01-02 at 18:07 +0100, Rainer Dorsch wrote:
> Am Sonntag, 2. Januar 2005 16:23 schrieb Kay Sievers:
> > On Sun, 2005-01-02 at 14:30 +0100, Rainer Dorsch wrote:
> > > Am Sonntag, 2. Januar 2005 02:27 schrieb Marco d'Itri:
> > > > On Jan 02, Rainer Dorsch <rdorsch@web.de> wrote:
> > > > > My problem is that this script is called four times when the dongle
> > > > > is plugged in. I order to avoid to call pand four times, I added a
> > > > > poor test and set to the script to add a lock when a pand is running.
> > > > > Does anybody know, what I could do to get a better locking behaviour,
> > > > > e.g. an atomic test and set?
> > > > >
> > > > >From http://linux-hotplug.sourceforge.net/?selected=usb:
> > > >
> > > > There are two kinds of usb hotplug event: device, and interface. Kernel
> > > > 2.6 added device events, as well as reporting the complete set of
> > > > interface events. You can tell which kind of event by the environment
> > > > variables: device events don't include PRODUCT, or any of the other
> > > > parameters here except DEVPATH and ACTION.
> > > >
> > > > So:
> > > >
> > > > # ignore device events
> > > > [ "$PRODUCT" ] || exit 0
> > >
> > > Many thanks for the quick reply.
> > >
> > > /devices/pci0000:00/0000:00:07.2/usb1/1-2
> > > /devices/pci0000:00/0000:00:07.2/usb1/1-2/1-2:1.0
> > > a12/1/525
> > > /devices/pci0000:00/0000:00:07.2/usb1/1-2/1-2:1.1
> > > a12/1/525
> > > /devices/pci0000:00/0000:00:07.2/usb1/1-2/1-2:1.2
> > > a12/1/525
> >
> > You get one device event and three interface events for this USB device.
> >
> > > That means that I should scan for a DEVPATH variable ending with 1.0 (?)
> >
> > You may just just match the event for the device. Just add the exit
> > statement Marco suggested and negate it to skip interface events
> > instead.
> >
> 
> Hmm... $PRODUCT and $TYPE are empty for the interface. Wouldn't that mean that 
> I try to start pand for every usb device?

You are right, sorry. I thought you were using the usermap and not the
multiplexer infrastructure.

Kay



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