From: "Mário Lopes" <mario.lopes@...>
Date: 2008-06-02T23:59:20+09:00
Subject: Traping signals on child processes

Hi,

I currently have a Ruby process that spawns another process through a
system() call in order to run an application from the command line. The
child process should not be aborted by INT signals and therefore the
parent process shall wait for it to finish before exiting.

In order to do so I tried trapping the INT signal but since system runs
in the foreground of the main process it seems that the application
that's being called gets the INT signal nevertheless, despite being
trapped in Ruby. The other approach I took was spawning a process in the
background and then waiting for it to finish but this approach adds a
lot of complexity due to shared code that can't be run twice.

What's the best approach to accomplish this? For the sake of simplicity
I'll leave a very simple example of what I want to do

Start main process
  Start system/child process
    INT signals can't stop whatever the system call is doing
  End system/child process
  If INT signal detected, exit, otherwise, continue running
End main process

Any ideas or suggestions to accomplish such are most welcome.

Thanks,

Mário
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