[Bug 196951] Feature request: fix wait-built to allow waiting for ANY process, not just the current shell's child

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=196951

Jilles Tjoelker <jilles at FreeBSD.org> changed:

           What    |Removed                     |Added
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                 CC|                            |jilles at FreeBSD.org

--- Comment #4 from Jilles Tjoelker <jilles at FreeBSD.org> ---
As noted by the pwait(1) man page, pwait is not a replacement for the wait
builtin, since it can wait for a process to terminate and show the exit status
but cannot clean up zombies or state on the parent process. Therefore, I don't
think the wait builtin should be changed -- if a script wants to wait for an
unrelated process, it can use pwait.

rc.subr already uses pwait when waiting for a service to stop. This does not
work optimally because pwait waits for a process to terminate, while rc.subr
wants to wait for the zombie to be reaped by the parent such as init (by
waiting until kill -0 PID fails).

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