Re: printf in udev085 rules? ENV{MODALIAS}=="?*"...

Re: printf in udev085 rules? ENV{MODALIAS}=="?*"...

[janusz borowski]

Hi,
also in v085 (ftp://ftp.kernel.org/pub/linux/utils/kernel/hotplug)
there are "printfs" in rules:
udev.rules
50-udev-default.rules
for SUBSYSTEM="usb_device" and "dvb".
Maybe, in that moment when subsytems "dvb" and "usb_device" exists
there is also defined stdout (or stderr ???)-
am I right?
Thanks in advance
janusz

Janusz Borowski wrote:
> 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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Re: printf in udev085 rules? ENV{MODALIAS}=="?*"...

[Kay Sievers]

On Mon, Feb 20, 2006 at 03:55:05AM -0500, janusz borowski wrote:
> Hi,
> also in v085 (ftp://ftp.kernel.org/pub/linux/utils/kernel/hotplug)
> there are "printfs" in rules:
> udev.rules
> 50-udev-default.rules
> for SUBSYSTEM="usb_device" and "dvb".
> Maybe, in that moment when subsytems "dvb" and "usb_device" exists
> there is also defined stdout (or stderr ???)-
> am I right?

Come on, it'a a shell invocation and has nothing to do with a udev
rule syntax. Please try to understand how variable assignment and
expansion in a simple unix shell works before going futher ahead
on this topic.

Thanks,
Kay


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