should rustix implement getifaddrs?

[Luca-spopo]

Hello, I've been really enjoying using this crate

I have a use case where I need to call getifaddrs via syscalls

I see that getifaddrs is listed as probably in scope for rustix
https://docs.rs/rustix/latest/rustix/not_implemented/yet/fn.getifaddrs.html

But it is also listed as out of scope for rustix
https://docs.rs/rustix/latest/rustix/not_implemented/higher_level/fn.getifaddrs.html

There is an issue in which this was mentioned as well: #1014
In that issue getifaddrs crate was listed as an alternative (but that crate uses libc)

I did look around, and right now getifaddrs is supported by some crates, but they all rely on libc.

I wanted to know if rustix would be interested in supporting getifaddrs via syscalls

I am willing to start an initial implementation for Linux (for syscalls and libc backends) and raise a PR if we decide that we want to support it in rustix. I can then look into other platforms, or anyone else who is interested could pick them up.

[sunfishcode]

The motivation for only supporting "syscall-like" things is that functions that merely call syscall-like functions don't need access to rustix's syscall infrastructure, and as such can be layered as a separate crate on top of rustix. This helps keep rustix scoped.

I've now submitted #1562 to remove getifaddrs from the "not yet" category.

[sunfishcode]

If you do make a separate crate, please let me know, feel free to file an issue or comment here or whatever. Thanks!