Re: [avrdude-dev] [bug #45256] Raspberry Pi sysfs bug workaround for linuxgpio driver

[Nick Sayer]

Perhaps some sort of driver flag... Call it "assume_exported" that would 
neither export nor unexport, but instead report an error if the requisite files 
didn't exist (implying the pins weren't exported). 

I don't know if driver specific flags are an option or not, but that might be 
the best way forward.   

Sent from my iPhone

> On Jun 7, 2015, at 2:16 AM, Peter Korsgaard <address@hidden> wrote:
> 
> On Fri, Jun 5, 2015 at 4:08 PM, Nick Sayer <address@hidden> wrote:
> 
>>> I believe this affects Raspbian only.
> 
>> It will affect any platform where udev rules have been set to change the 
>> permissions of the gpio nodes. This includes platforms where users have 
>> manually created such rules because they understand the value of “least 
>> privilege.”
> 
> Alternatively, the linuxgpio logic could be changed to only try to
> export if the gpio isn't exported already (and leave exported at close
> time), and those platforms could just export the needed gpios up
> front.
> 
> -- 
> Bye, Peter Korsgaard