That's neither necessary nor sufficient.
The problem is that you might get one SIGCHLD even though more than
one child has gone belly up, and thus you aren't waiting long enough.
Either use a double-fork solution (so the kids are effectively orphaned
grandkids who become adopted by process #1), or a waitpid loop
until there are no more kids to reap at opportune times in your algorithm.
-- Randal L. Schwartz, Perl hacker
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