From the perlvar docs:
$?
The status returned by the last pipe close, backtick (``) command, successful call to wait() or waitpid(), or from the system() operator. This is just the 16-bit status word returned by the traditional Unix wait() system call (or else is made up to look like it). Thus, the exit value of the subprocess is really ($? >> 8), and $? & 127 gives which signal, if any, the process died from, and $? & 128 reports whether there was a core dump. Additionally, if the h_errno variable is supported in C, its value is returned via $? if any gethost*() function fails. If you have installed a signal handler for SIGCHLD, the value of $? will usually be wrong outside that handler.

In reply to Re: Getting a return code from waitpid in Windows by kschwab
in thread Getting a return code from waitpid in Windows by Anonymous Monk

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