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



int main(void)
{
   int istatus;
   pid_t chPid[10];
   int i;


   for(i=0;i<10;i++){

      printf("=======================================\n");

      chPid[i] = fork(); // Creating child

      if(chPid[i] == 0){

         int j;

         for(j=0;j<20;j++){
            printf("\t\tchild... %d  : %d\n", i, j);
            sleep(i%2+1);
         }

         printf("\t\tchild... exit... %d  : %d \n", i, chPid[i]);

         exit(0);
      }else if(chPid > 0){

         printf("\t\tparent... new child id : %d\n", chPid[i]);

      }else{
         printf("fork error....\n");
      }

      usleep(100000);
   } /* while("123"){ */



   for(i=0;i<10;i++){
      waitpid( chPid[i], &istatus, 0 );
      printf("parent : chield %d is exited\n", chPid[i]);
   }



   return 0;
}