I have the following code, which I'm trying to only allow a maximum of 5 children to run at a time, but I can't figure out how to decrement the child count when a child exits.

struct {
   char *s1;
   char *s2;
} s[] = {
  {"one", "oneB"},
  {"two", "twoB"},
  {"three", "thr4eeB"},
  {"asdf", "3th43reeB"},
  {"asdfasdf", "thr33eeB"},
  {"asdfasdfasdf", "thdfdreeB"},
  {"af3c3", "thrasdfeeB"},
  {"fec33", "threfdeB"},
  {NULL, NULL}
};

int main(int argc, char *argv[])
{
int i, im5, children = 0;
int pid = fork();
for (i = 0; s[i].s2; i++)
{
    im5 = 0;
    switch (pid)
    {
        case -1:
        {
            printf("Error\n");
            exit(255);
        }
       case 0:
       {
            printf("%s -> %s\n", s[i].s1, s[i].s2);
            if (i==5) im5 = 1;
            printf("%d\n", im5);
            sleep(i);
            exit(1);
        }
        default:
        {   // Here is where I need to sleep the parent until chilren < 5 
            // so where do i decrement children so that it gets modified in the parent process?
            while(children > 5)
                sleep(1);
            children++;
            pid = fork();
        }
    }
}
return 1;
}