Hi.

I am one of the Debian rust team and have been investigating updating our rust-async-io package from 1.x to 2.x. While we do have a mechanism for packaging multiple versions of a crate it's something we try to avoid where possible. So I looked into updating netlink-sys to use the new version of async-io.

The main change in the new version of async-io is the adoption of "IO safety". The idea that file descriptors should have their lifetimes managed in a similar manner to memory. This has meant a switch from RawFd/AsRawFd to BorrowedFd/AsFd. It also means that a number of functions have been marked as unsafe that were not previously so marked.

As I understand it this does not mean that the functions are any more dangerous than they were before, just that the danger must now be acknowledged.

I prepared an initial patch to make netlink-sys build with the new version of async-io, it can be found at https://salsa.debian.org/rust-team/debcargo-conf/-/blob/072d11ba3339504af28f15145681c48ad3894392/src/netlink-sys/debian/patches/async-io-2.patch