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

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  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 }
 39 

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