Handle BSD Too many open files in system (os error 23)

[0xpr03]

We currently handle inotify limits.

We should also handle this for BSD as code 23. Not sure if this is with kqueue, and where exactly this error comes up. Would need a BSD person to check this.

Origin: extrawurst/gitui#1439

[mqudsi]

It's an error with kqueue (or the kqueue implementation) and I received it on macOS as well when I was using RecommendedWatcher with features = [ "macos_kqueue" ]. The file limit seems relatively low, as I experienced this with a directory with "only" 28,850 files/entries across its descendants.

[0xpr03]

Note that every folder counts too. It is an inode limit enforced by the OS which we can only gracefully hand to the user of the lib.

[mqudsi]

The count included folders as well, fwiw. Edit: Or maybe not, I’d have to double check.

I imagine it’s possible to paper around this by watching the root directly non-recursively and child directories recursively individually but almost certainly out of scope for the crate.