Why not use the fact that a pipe-open returns the PID of the child on success?

my $child = open my $y, '/usr/bin/sleep 5|'
    or die "Couldn't spawn: $!/$?";
END {
    kill 9, $child
        if $child;
};

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In reply to Re: open pipe for input and die by Corion
in thread open pipe for input and die by pht

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