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
12 int 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 close(fd);
36 return EXIT_FAILURE;
37 }
38
39 close(fd);
40 return EXIT_SUCCESS;
41 }
42
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