From: Joe Van Dyk <joevandyk@...>
Date: 2005-06-02T02:03:00+09:00
Subject: killing ruby program from C

Hi,

I need to start some Ruby programs from a C program.  The C program
needs to be able to terminate the Ruby programs when it either exits
or some condition is met.

I tried:

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>


int main()
{
  system("ruby test.rb");

  sleep(5);
  if (killpg(0, SIGKILL) == -1)
    perror("killpg");
  printf("main program ending\n");
  return 0;
}

Which seems to work fine on a non-ruby program (i.e. another C
program).  But the Ruby program (a simple while-true loop that prints
stuff) doesn't exit when the C program does killpg.

Thoughts?