[LAU] RTC/HPET timer permissions

Brent Busby brent at keycorner.org
Sun Nov 25 19:05:26 UTC 2012


On Sun, 25 Nov 2012, Clemens Ladisch wrote:

> Brent Busby wrote:
>> Is it still necessary or recommended these days for proper operation
>> of audio apps to have a user-accessible /dev/rtc?
>
> Not really.  Using the RTC or HPET devices directly is necessary only 
> if the kernel does not use them for timers.  Nowadays, kernels do, and 
> applications use the proper timer APIs.
>
> You'd need this only if you're using some audio application that 
> hasn't been updated for many years.

Ok, that explains why it's been a long time since I've seen those device 
permissions actually break anything.  The reason I ask though is because 
the web site for Muse still has a section on making sure /dev/rtc is 
accessible:

http://muse-sequencer.org/index.php/Faq#RTC_Timer

-- 
+ Brent A. Busby	 + "We've all heard that a million monkeys
+ Sr. UNIX Systems Admin +  banging on a million typewriters will
+ University of Chicago	 +  eventually reproduce the entire works of
+ James Franck Institute +  Shakespeare.  Now, thanks to the Internet,
+ Materials Research Ctr +  we know this is not true." -Robert Wilensky


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