#include <fcntl.h> /* O_RDONLY, O_WRONLY, ... */
#include <stdio.h> /* BUFSIZ, EOF */
#include <sys/stat.h> /* struct stat */
#include <unistd.h> /* read, write, open, close */
#include <fcntl.h> /* O_RDONLY, O_WRONLY, ... */
#include <stdio.h> /* BUFSIZ, EOF */
#include <sys/stat.h> /* struct stat */
#include <unistd.h> /* read, write, open, close */