#include <stdio.h>
#include <linux/errno.h>
#include <sys/syscall.h>
#include <linux/unistd.h>
#include <errno.h>
#include <stdlib.h>


int main(int argc, char* argv[]){
  
  if (argc != 2){
    printf("Usage: ./scanner [UID]; -1 for all users, -2 for bonus \n");
    exit(1); 
  }
  
  int myUid = atoi(argv[1]);
  
  while (myUid < -2){
    printf("Try again...\n"
	"Usage: ./scanner [UID]; -1 for all users, -2 for bonus \n");
    scanf("%d", &myUid); 
  }
  
  printf("Calling the new system call...\n");
  syscall(__NR_scanner, myUid);
  printf("End new system call\n");
  
  return 1;
}