waitpid doesn't returned pid

[SUPERCILEX]

Is there a reason for this? It should return a (Pid, WaitStatus) so you can spawn multiple processes in parallel and wait for them to finish in any order while performing specific actions on a process' completion.

[SUPERCILEX]

wait kind of counts, but doesn't have the same semantics because it will wait for any children rather than just the ones in the same process group.

[sunfishcode]

No, this appears to just be an oversight. The original waitpid API in rustix didn't support waiting on process groups so the pid return value was redundant, but it now does support waiting in process groups, so it should return the pid.

[SUPERCILEX]

Cool! Should I submit a PR or does this go into the 1.0 issue? Not sure how you're managing breaking changes...

[sunfishcode]

You can submit breaking changes to the 1.0-staging branch. I'm going to start working toward a 1.0 release in order to fix #917 / #990, though there are a few things to do, so I don't yet have a timeline in mind.

If you'd like to do something that could be released sooner, we could add a new function named something like waitpid_pid or so, which returns the pid.