Re: +rule: query device inode by Major and Minor - am i inventing

[Arioch <the_Arioch@nm.ru>]

Greg KH пишет:

>>But what should tell character devices from, say, network interfaces ?
> Perhaps SUBSYSTEM=="net"?  :)

way to fragile rules.

SUBSYSTEM!="block", SUBSYSTEM!="net", ....

...and tomorrow this script would be run on another platform, that has 
subsystem i did not have. Or just new subsystem was invented. And the 
rule immediately fails.

Those matches, they do not tell character devices from subsystem, but 
they tell knon (to me) subsystems from the unknown rest (which i believe 
to be character devices and nothing else).

Guess i also can dp something like PROGRAM="/bin/file %P", 
Result=="*character*" but...
...then i again can stumble upon stderr
...and i cannot call another program

Oh, i guess i can determine something, then ENV{tmp_xxx}:='flag', then 
use it later. (i remember i heard that ENV can be LValue now)
Or again i can use scripts.

but that seems that rather simple task needs rather complex actions to 
implement :-)

>>Alas, i don't know where to et list of subsystems :-(
> 
> 'ls /sys/class/' is a good place to start (becides the block subsystem,
> which is still in /sys/block/ due to a whole bunch of kernel coding
> reasons...)
...assuming my kernel has all of them.
kernel docs sysfs.txt and kobject.txt  are written for oldschool 
  kernel hacker introducing him to new concepts. I wish to see someday 
SYSFS in 30 days for users ;)



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