CODEWITHSUNDEEP
linuxraspbianraspberry-pi2gpiowiringpi
KcFnMi
KcFnMi

Reputation: 6171

wiringPi non-root access to GPIO

From this I though acess to GPIO for non-root users would be possible using wiringPiSetupSys() but I failed trying that.

Actually, if I do setuid on the executable then it works. So, wiringPiSetupSys() isn't enought?

$ ./gpio write 4 1  // This don't work :(
# chown root gpioapp
# chmod u+x gpioapp
$ ./gpio write 4 1  // This works :)

Upvotes: 2

Views: 6680

Answers (2)

Armali
Armali

Reputation: 19395

Is your non-root user a member of the gpio group? – Ben Voigt

Yeah, that's the point! It wasn't, just changed (usermod -a -G gpio myuser) and now it's working. – KcFnMi

Upvotes: 1

Joel C
Joel C

Reputation: 3158

According to the GPIO utility documentation, the gpio utility is designed to be installed as setuid. Once that has been used to export the pins (as is required by wiringPiSetupSys), you can call wiringPiSetupSys as a non-root user (see http://wiringpi.com/reference/setup/).

Upvotes: 1

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