Take the 2-minute tour ×
Unix & Linux Stack Exchange is a question and answer site for users of Linux, FreeBSD and other Un*x-like operating systems.. It's 100% free, no registration required.

Can the default permissions and ownership of /sys/class/gpio/ files be set, e.g. by configuring udev? The point would be to have a real gid for processes that can access GPIO pins on a board.

Most "solutions" include suid wrappers, scripts with chown and trusted middleman binaries. Web searches turn up failed attempts to write udev rules.

(related: Q1)

(resources: avrfreaks, linux, udev)

share|improve this question
add comment

1 Answer

up vote 0 down vote accepted

The GPIO interface seems to be built for system (uid root) use only and doesn't have the features a /dev interface would for user processes. This includes creation permissions.

In order to allow user processes (including daemons and other system services) access, the permissions need to be granted by a root process at some point. It could be an init script, a middleman, or a manual (sudo) command.

share|improve this answer
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.