C get all open file descriptors

Question

I want to implement behavior in my C program so that if a SIGINT happens, I close all open file descriptors. Is there a simple way to get a list of them?

Answer 1

You could read out the content of /proc//fd., if available.

But be aware of the potiential race, that might occur if your application closes some or opens new ones in between your read out /proc//fd and you are going to close what you read.

So conculding I want to recommend Kevin Reid's approach to this.