printf in udev rules? ENV{MODALIAS}=="?*"...

printf in udev rules? ENV{MODALIAS}=="?*"...

[Janusz Borowski]

Hi,
I would like to know if printf in udev rules could at all do something?

(I have temporary removed all "printfs" from the udev rules and
I have looked carefully at the console messages. I have not seen any
difference in messages on console - no matter if there are "printfs" in
rules or no.)

If printfs in udev rules are able to do anything, could someone gives me
an example:

a)what should I do to see "printf" in action ?
b)where exactly I should look at to see this activity?

Thanks in advance
janusz

Ps
Writing  #9544
I thought that "a printf" could give echo on console
but now I am not sure....
~





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Re: printf in udev rules? ENV{MODALIAS}=="?*"...

[Greg KH]

On Sun, Feb 19, 2006 at 12:09:24PM +0100, Janusz Borowski wrote:
> Hi,
> I would like to know if printf in udev rules could at all do something?

No, as there is no "console" at that point in time to be able to print
to.

Try writing to a file instead.

Hope this helps,

greg k-h


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Re: printf in udev rules? ENV{MODALIAS}=="?*"...

[Janusz Borowski]

Thanks very much for information!
But, it is very surprising for me:
what could be a reason to put "printf" in the maintainer's
set of rules (eg. devfs.rules)????
For future applications???
janusz

On Sun, 19 Feb 2006, Greg KH wrote:

> On Sun, Feb 19, 2006 at 12:09:24PM +0100, Janusz Borowski wrote:
> > Hi,
> > I would like to know if printf in udev rules could at all do something?
> 
> No, as there is no "console" at that point in time to be able to print
> to.
> 
> Try writing to a file instead.
> 
> Hope this helps,
> 
> greg k-h
> 
> 
> -------------------------------------------------------
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> 
> 



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