Add EADDRNOTAVAIL error to rust

[kloenk]

This will be used for network drivers. (#439)

[ojeda]

Perhaps we should add all the ones from include/uapi/asm-generic/errno.h.

[kloenk]

Perhaps we should add all the ones from include/uapi/asm-generic/errno.h.

That would probably be a good idea. But doing it from hand is not the best work to do :-).

Maybe we can build some Marco to do it?

[kloenk]

What about a short macro to make it easier, eg that you have to write it like this to declare ENOEXEC:

/// Exec format error.
declare_err!(ENOEXEC);

[bjorn3]

I think the doc comment will need to be inside the macro invocation for this to work.

[kloenk]

really? if the macro just expands to pub const ENOEXEC: Self = Error(-(bindings::ENOEXEC as i32));?

[kloenk]

I think I will just try it out

[kloenk]

Yes, sadly you are right, I think it's still a bit easier to write declare_err!("Operation not permitted.", EPERM); instead of pub const EPERM: Self = Error(-(bindings::EPERM as i32));

[kloenk]

rebased and moved to the macro, Will add missing errors now

[kloenk]

@ojeda I now included all errors from include/uapi/asm-generic/errno.h as requested.