// SPDX-License-Identifier: GPL-2.0
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>

int main(int argc, char **argv)
{
        const char *path;
        char buf[4];
        int fd, rc;

        if (argc < 2) {
                fprintf(stderr, "usage: %s <path>\n", argv[0]);
                return EXIT_FAILURE;
        }

        path = argv[1];

        /* create a test variable */
        fd = open(path, O_RDWR | O_CREAT, 0600);
        if (fd < 0) {
                perror("open(O_WRONLY)");
                return EXIT_FAILURE;
        }

        rc = read(fd, buf, sizeof(buf));
        if (rc != 0) {
                fprintf(stderr, "Reading a new var should return EOF\n");
                close(fd);
                return EXIT_FAILURE;
        }

        close(fd);
        return EXIT_SUCCESS;
}