LXR linux/tools/testing/selftests/efivarfs/create-read.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <stdio.h>
   3#include <stdint.h>
   4#include <stdlib.h>
   5#include <unistd.h>
   6#include <sys/types.h>
   7#include <sys/stat.h>
   8#include <fcntl.h>
   9#include <errno.h>
  10#include <string.h>
  11
  12int main(int argc, char **argv)
  13{
  14        const char *path;
  15        char buf[4];
  16        int fd, rc;
  17
  18        if (argc < 2) {
  19                fprintf(stderr, "usage: %s <path>\n", argv[0]);
  20                return EXIT_FAILURE;
  21        }
  22
  23        path = argv[1];
  24
  25        /* create a test variable */
  26        fd = open(path, O_RDWR | O_CREAT, 0600);
  27        if (fd < 0) {
  28                perror("open(O_WRONLY)");
  29                return EXIT_FAILURE;
  30        }
  31
  32        rc = read(fd, buf, sizeof(buf));
  33        if (rc != 0) {
  34                fprintf(stderr, "Reading a new var should return EOF\n");
  35                return EXIT_FAILURE;
  36        }
  37
  38        return EXIT_SUCCESS;
  39}
  40