From: Lawrence Oluyede <raims@...>
Date: 2005-05-13T05:35:28+09:00
Subject: Get back data from a child (with exec)


What I'm trying to do is to pass some data
to a child process that execute an external process
and get back data from this external process.

---
PATH = "/usr/bin/highlight"
ARGS = "-f -l -t 8 -S %s"
LANG = "rb"

rd, wr = IO.pipe

if fork
  # parent
  rd.close
  $stdout.reopen(wr)
  wr.close

  fd = File.open("/usr/lib/ruby/1.8/thread.rb")
  str = fd.read
  $stdout.write str
else
  # child
  wr.close
  $stdin.reopen(rd)
  rd.close

  params = ARGS % LANG
  cmd = "%s %s" % [PATH, params]  
  exec cmd
end
---

This works but child puts returned data to the standard output
(to the linux shell). I'd like to get back that output in the parent.
How can I do it? 

-- 
Lawrence
http://www.oluyede.org/blog