Continue follow this thread
http://community.onion.io/topic/2194/gpio-interrupts-omega2

We're in the same boat.
And I have other problems like i2c, support of the company, part of sales that neither answers.

@Johan-Simons Thanks for the quick reply.

Surprised to hear that removing the sigaddset doesn't work for you - it seems to do so for me. I will have a closer look and get back to you as and when I find anything. Thanks for the info on how you are building - this implies that the extra memory usage for new-gpio is down to the extra code functionality

Thank you @kit-bishop,

I will read them.