plan9 kernel doesnt send notes on process exit to the parent. i do not see any trivial way to emulate SIGCHLD as ape might spawn also native processes so we cannot just add code to ape to emit the signal on exit.
we might handle wait records in a separate process tho using the devproc's wait file (that means also we would need to reimplement the various wait functions in ape as one would get a Einuse error on wait() when someone reads your wait file, ugh) and also generate a signal. but its not trivial :( -- cinap
