#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>

int main(void) {
    const char path[] = "hello.txt";
    int fd = open(path, O_RDONLY);
    if (-1 == fd) {
        perror("open");
        return 1;
    }

    return 0;
}