For future reference, questions about Perl should be posted in Seekers of Perl Wisdom and not in Perl Monks Discussion as you've done here.
The first sentence of the Perl Monks Discussion page says:
"This section is only for discussing issues pertaining to the PerlMonks web site."
[Update: I see that the thread has now been moved to SoPW following consideration.]
On to your question. The Proc::Simple documentation says this about the exit_status() method:
"Returns the exit status of the process as the $! variable indicates. If the process is still running, undef is returned."
You can read about $! in perlvar - Error Variables.
You'll need to look at the child processes you're forking for answers as to why they're exiting with -1.
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
Read Where should I post X? if you're not absolutely sure you're posting in the right place.
Please read these before you post! —
Posts may use any of the Perl Monks Approved HTML tags:
You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||