//=====================================================
// Matt Kretchmar
// A small program to create processes
//=====================================================

#include <unistd.h>      /* symbolic constants */
#include <sys/types.h>   /* system data types */
#include <errno.h>       /* Errors */
#include <stdio.h>       /* Input/Output */
#include <sys/wait.h>    /* Wait for Process Termination */
#include <stdlib.h>      /* General Utilities */

int main ( int argc, char *argv[] )
{
   pid_t  pid;          /* variable to hold process id */
   int i;
   int n = 0;

   if ( argc >= 2 )
      n = atoi(argv[1]);

   for (i = 0; i < n; i++ )
   {   
      printf("Level %d\n",i);
      pid = fork();
      if ( pid != 0 )
         printf("%d child spawned\n",pid);
      sleep(1);
   }

   printf("Level %d\n",n);

   int status;
   while ( (pid = waitpid(-1,&status,0)) > 0 )
   {
      printf("Parent (%d) waited for %d\n",getpid(),pid);
   }
   return 0;
}