#include <sys/types.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <stdlib.h>

#include <stdio.h> int main(void) {

int fd_a;

int fd_b;

int fd_c;

int fd_d;

fd_a = open(«baobab.txt», O_CREAT | O_RDWR , 0664);

if(fd_a == -1) {

perror(«open»);

exit(EXIT_FAILURE);

}

close(fd_a);

if(fd_a == -1) {

perror(«close»);

exit(EXIT_FAILURE);

}

...

exit(EXIT_SUCCESS);

}