Only one byte is allowed for a return status on UNIX, so 255, 0xff, all bits set is the max allowed. Setting 256 potentially sets a bit in the more significant byte, leaving the status byte as zero.

In reply to Re: What is a successful return status for perl wait() in Solaris? by cdarke
in thread What is a successful return status for perl wait() in Solaris? by kduong

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