/* 
      Create lots of child processes, keep them busy, and have them
      report periodically.
    */

    #include <stdio.h>

    #define NUM_CHILDREN 50
    #define NUM_PRINTS 20
    #define NUM_DELAY_LOOPS 3000000

    void main()
    {
       int i, j, pid, status;
       for(i=0; i < NUM_CHILDREN; i++)
         if ((pid = fork()) == 0) break;
       if (pid != 0)
         for(i=0; i < NUM_CHILDREN; i++)
           waitpid(-1, & status, 0);
       else {
         pid = getpid();
         for (i=0; i < NUM_PRINTS; i++)
         {
           for (j=0; j < NUM_DELAY_LOOPS; j++) /* do nothing */ ;
           printf("Hello there from process %d.\n", pid);
         }
       }
       printf("Good-bye from process %d.\n", getpid());
    }