Re: [9fans] waitpid()

[Fco.J.Ballesteros <nemo@lsub.org>]

> Posix waitpid() seemingly can select the PID to wait for.  Unlike P9
> waitpid(2) which merely returns the PID.

My question is, what does posix say regarding the pids
you don't want. I mean, does it say something like

"when waitpid finds an unwanted pid it guarantees that such
information is not dropped" or the opposite, or just nothing about.
Perhaps rsc knows.

Regarding what should be done, I think that all waitpid() variants
should be dropped. The regular wait one is the one that should
be there IMHO. If you just happen to be looking for a particular
pid, then put your wait() in a lopp. If you also happen to want to
keep the unwanted ones around (should you want to wait for them
in the future), record them in a list.

The plan9 waitpid is a convenience for the case when you look for
a pid but don't care about others. Thus, I wouldn't vote for changing
the native interface; I'd just change ape, but only if posix says so.
Otherwise I'd fix the program using ape.