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

void forkChildren (int nChildren) {
  int i;
  pid_t pid;
  for (i = 1; i <= nChildren; i++) {
    pid = fork();
    if (pid == -1) {
      /* error handling here, if needed */
      return;
    }
    if (pid == 0) {
      printf("I am a child: %d PID: %d\n",i, getpid());
      sleep (5);
      return;
    }
  }
}

int main (int argc, char *argv[]) {
  if (argc < 2) {
    forkChildren (2);
  } else {
    forkChildren (atoi (argv[1]));
  }
  return 0;
}