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

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