Shell out bug in pg (but a more general problem)

[Joseph S. D. Yao]

[Re: checking the return value of wait(2) for pid/-1.]
> Any such code out there should be redone, and all future code which
> waits for children *must* check that the process which exited is the
> process that was being waited for.

This was being said some time around the era of   V E R S I O N   5!
All versions of UNIX that I can recall, back to that era, had both this
feature and this bug in most of its code.  (I'm not familiar with UNIX
before 1974/V5 -- the problem may even predate that.)
;-S

Joe Yao		hadron!jsdy at seismo.{ARPA,UUCP}