It's not disallowed, it's undefined. The distinction is because BSD
4.x-derived Unixes and System III-derived Unixes do different things with
SIG_IGN of SIGCH?LD; instead of mandating one of them, POSIX explicitly
washes its hands of the matter and lets a POSIX-compliant system do either
(or launch Nethack :-)
The bug is because whoever built the cron binary tried to call Linux a BSD
when it is in fact rather more like System V. This was a common cause of
"Linux" bugs several years ago; I'd thought that most developers had figured
out by now that Linux is behaviorally SVID/POSIX, not 4.xBSD, so I
completely forgot about the wait() behavior which a few years ago would have
sent me looking for the erroneous -DBSD. :-)
-- brandon s. allbery [os/2][linux][solaris][japh] allbery@kf8nh.apk.net system administrator [WAY too many hats] allbery@ece.cmu.edu carnegie mellon / electrical and computer engineering KF8NH Kiss my bits, Billy-boy.
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