I pointed you to documentation the states the following: 
$? == -1:  Error launching child (See $! for cause)
$? & 0x7F: Child died from this signal if non-zero
$? >> 8:   Child's exit code

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In reply to Re^5: Parallel::ForkManager run_on_finish Canot get Exit Code of Child process by ikegami
in thread Parallel::ForkManager run_on_finish Canot get Exit Code of Child process by anshumangoyal

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