Thread: Returning file descriptors

I am having trouble returning a file descriptor to main and calling a 2nd function there passing the returned file descriptor as paramater.

Code:

FILE *file_des;
FILE x; 

FILE input(char* title){
  file_des = fopen(title, "r");
  return file_des;
}


void do_someting (FILE *x){
 int letter;
 while ((letter = fgetc(file_des) != EOF)
     printf ("%c",letter);
}
  

int main (int ac, char *av[]){
   x = input(av[1]);
  do_someting(x);
}