uDev/ hotplug and modules

uDev/ hotplug and modules

[Don Nelke]

Greetings,

Does udev (075) and hotplug work without loadable modules? 
It seems hotplug is working but udevsend is seg-faulting when invoked in
lieu of the /sbin/hotplug script.  

I replaced the call to /sbin/hotplug in the kobject_hotplug function.
The path was hard-coded in our version. I was thinking this was wrong;
shouldn't this be using the contents of /proc/sys/kernel/hotplug?

The object of this effort is to be able to detect when a usb-storage
device is present on boot-up and to mount the device fs. It seems that
udev was the answer since it gives a dynamic node creation if the device
is detected. All a script has to do is check for that node.  Is my
understanding correct?
 
Kernel 2.6.13
udev 075 
hotplug-2004_03_29

Don Nelke


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Re: uDev/ hotplug and modules

[Kay Sievers]

On Thu, Nov 17, 2005 at 06:13:43PM -0800, Don Nelke wrote:
> Does udev (075) and hotplug work without loadable modules? 

It should.

> It seems hotplug is working but udevsend is seg-faulting when invoked in
> lieu of the /sbin/hotplug script.

I don't think this happens with a normal kernel. I'm sure someone else
would have noticed it.

> I replaced the call to /sbin/hotplug in the kobject_hotplug function.
> The path was hard-coded in our version. I was thinking this was wrong;
> shouldn't this be using the contents of /proc/sys/kernel/hotplug?

Are you talking about the kernel source? Sure, the event helper is set by
writing to /proc/sys/kernel/hotplug. What the hell is "our version" and
who is doing such a nonsense?

> The object of this effort is to be able to detect when a usb-storage
> device is present on boot-up and to mount the device fs. It seems that
> udev was the answer since it gives a dynamic node creation if the device
> is detected. All a script has to do is check for that node.  Is my
> understanding correct?

You can hook into any event device event the kernel sends. Just match
with a udev rule against device properties the kernel exports and call
a script or program with the RUN key.

Kay


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