From: Ralph Shnelvar <ralphs@...32.com>
Date: 2010-08-31T01:47:11+09:00
Subject: fork() function is unimplemented on this machine

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I am trying to implement the code on page 181 of *Programming Ruby 1.9*

The code on that page reads

- - -
trap("CLD") do
  pid = Process.wait
  puts "Child pid #{pid}: terminated
end
fork { exec("sort testfile >output.txt") }
- - -


When I attempt to run similar code I first get that
  unsupported signal SIGCLD

I tried SIGCHLD ... same problem.

Signals.list generates
  {"SEGV"=>11, "KILL"=>9, "TERM"=>15, "INT"=>2, "FPE"=>8, "ABRT"=>22, "ILL"=>4, "EXIT"=>0}

So I next tried 

- - -
trap("EXIT") do
  pid = Process.wait
  puts "Child pid #{pid}: terminated
end
fork { exec("sort testfile >output.txt") }
- - -

and that's when I get the msg 
  fork() function is unimplemented on this machine



Is fork truly not implemented for 1.8.6 and Windows?

How can I execute (spawn) an external program in 1.8.6 and know when the program is finished?

here are the various signals for ruby documented?
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