Propagation of hardware interrupts

[flongo82]

Forward hardware interrupts to the virtual GPIO pseudo-filesystem, i.e., implement poll() syscall on top of FUSE.

[KostyaEsmukov]

poll operations seem to be supported by the libfuse (as seen in poll_8c.html and structfuse), but aren't implemented in nodejs libraries yet: fuse-bindings (mafintosh/fuse-bindings#21) and c4milo/fusejs.

We should either implement them in nodejs library(ies) or use libfuse in C/C++ directly.

[flongo82]

Nobody even replied to my comment on that issue. :-(

By the way, I had a look around some time ago and noticed that FUSE libraries provided in any other language do not usually support poll operations. This is interesting because it highlights that we are doing something really innovative or at least that our use case for FUSE has not been considered before.

I guess it should not be that difficult to extend the Node.js bindings given that the C/C++ function is already there. Do not know why nobody did that till now.