$SIG{CHLD} = sub {while (waitpid(-1, WNOHANG) > 0){} };

AFAIK, on most platforms (where reaping children is of concern), setting 

    $SIG{CHLD} = 'IGNORE';

[download]

should have the same effect, as it will make Perl autoreap terminated child processes.  And it's less clutter (you don't need to load/import WNOHANG from POSIX ...).

See also perlipc.

In reply to Re^2: Best way to kill a child process by Eliya
in thread Best way to kill a child process by doylebobs

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