/* Copyright (c) 2002 Natkeeran Ledchumikanthan (nledchum@ee.ryerson.ca) */
/* Aim:	Learn that Execl Function executes as the child process */

#include 
#include 
#include 
#include 
#include 

/**
 * Function main creates a child process and executes a file as that process?
 */
int main()
{ int fork_return;
  int count = 0;

  printf("===> (PARENT) hi, I am the parent process\n");
  printf("===> (PARENT) My Pid is:   %d \n", getpid());
  printf("===> (PARENT) I will create a child.\n ");

  fork_return = fork();		/* This forks a process */
  if ( fork_return < 0)
  {	printf(" Sorry \n");
	exit(-1);
  }

  if (fork_return > 0)
  { printf("===> (PARENT) I will sleep for 10 seconds\n");
    usleep(10000000);
    printf("===> (PARENT) Killing my child \n");
    printf("===> (PARENT): I am quiting too. \n ");
    kill(getppid(), SIGQUIT);
    kill(getpid(), SIGQUIT);
  } 
  else
  {
  /* Lets fork it */
 printf("===> (CHILD) hi, I am the child process  %d \n ", getpid());
 printf("===> (CHILD): calling hello process\n"); 
 execl("hello","hello",NULL);	  /* The child executing the program hello*/
 while (count <= 25)
   {
     printf("Child Timeline: %d second mark. \n", count);
     usleep(2000000);
     count = count + 5;
   }
  }  
  return(0);
}