/* FILE: leggiPippo.c */
#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
 
int main(int argc, char **argv)
{
int fd;
char c;

printf("real-user id = %d\n", getuid());
printf("effective-user id = %d\n", geteuid());
printf("SONO %s\n", argv[0]);
puts("Sto per leggere il file pippo");

if ((fd=open("pippo", O_RDONLY)) < 0) 
	{ puts("ERRORE in apertura");
	  exit(-1);
	  }

while(read(fd, &c, 1))
  write(1, &c, 1);
exit(0);
}