gistfile1.txt

int
main(void) {
        int root = open("/", O_RDONLY);
        int rc;
        printf("root fd: %d\n", root);
        rc = chroot("f");
        printf("chroot(f): %d\n", rc);
        rc = fchdir(root);
        printf("fchdir(root): %d\n", rc);
        rc = chroot(".");
        printf("chroot(.): %d\n", rc);
        int r2 = open("/", O_RDONLY);
        printf("root fd 2: %d\n", r2);
        return 0;
}