#!/usr/bin/perl
# Fig. 18.3: fig18_03.pl
# Demonstrating the waitpid function.

use warnings;
use strict;

my ( $pid, $pid2 );
$| = 1;

if ( ( $pid = fork() ) && ( $pid2 = fork() ) ) {
   print( "I have to wait for my kids.\n" );
   my $straggler = waitpid( $pid, 0 );
   print( "Finally $straggler finished, now I can go.\n" );
}
elsif ( $pid && defined( $pid2 ) ) {
   sleep( 2 );
   print( "Kid 2: Mine is not...\n" );
   sleep( 4 );
   print( "Kid 2: Hey! Wait for me!!!\n" );
   exit();
}
elsif ( defined( $pid ) ) {
   sleep( 1 );
   print( "Kid 1: My parent is very patient...\n" );
   sleep( 2 );
}
else {
   die( "Forking problems: " );
}

###########################################################################
#  (C) Copyright 2001 by Deitel & Associates, Inc. and Prentice Hall.     #
#  All Rights Reserved.                                                   #
#                                                                         #
#  DISCLAIMER: The authors and publisher of this book have used their     #
#  best efforts in preparing the book. These efforts include the          #
#  development, research, and testing of the theories and programs        #
#  to determine their effectiveness. The authors and publisher make       #
#  no warranty of any kind, expressed or implied, with regard to these    #
#  programs or to the documentation contained in these books. The authors #
#  and publisher shall not be liable in any event for incidental or       #
#  consequential damages in connection with, or arising out of, the       #
#  furnishing, performance, or use of these programs.                     #
###########################################################################