1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <stdio.h>
3*4882a593Smuzhiyun #include <stdint.h>
4*4882a593Smuzhiyun #include <stdlib.h>
5*4882a593Smuzhiyun #include <unistd.h>
6*4882a593Smuzhiyun #include <sys/types.h>
7*4882a593Smuzhiyun #include <sys/stat.h>
8*4882a593Smuzhiyun #include <fcntl.h>
9*4882a593Smuzhiyun #include <errno.h>
10*4882a593Smuzhiyun #include <string.h>
11*4882a593Smuzhiyun
main(int argc,char ** argv)12*4882a593Smuzhiyun int main(int argc, char **argv)
13*4882a593Smuzhiyun {
14*4882a593Smuzhiyun const char *path;
15*4882a593Smuzhiyun char buf[4];
16*4882a593Smuzhiyun int fd, rc;
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun if (argc < 2) {
19*4882a593Smuzhiyun fprintf(stderr, "usage: %s <path>\n", argv[0]);
20*4882a593Smuzhiyun return EXIT_FAILURE;
21*4882a593Smuzhiyun }
22*4882a593Smuzhiyun
23*4882a593Smuzhiyun path = argv[1];
24*4882a593Smuzhiyun
25*4882a593Smuzhiyun /* create a test variable */
26*4882a593Smuzhiyun fd = open(path, O_RDWR | O_CREAT, 0600);
27*4882a593Smuzhiyun if (fd < 0) {
28*4882a593Smuzhiyun perror("open(O_WRONLY)");
29*4882a593Smuzhiyun return EXIT_FAILURE;
30*4882a593Smuzhiyun }
31*4882a593Smuzhiyun
32*4882a593Smuzhiyun rc = read(fd, buf, sizeof(buf));
33*4882a593Smuzhiyun if (rc != 0) {
34*4882a593Smuzhiyun fprintf(stderr, "Reading a new var should return EOF\n");
35*4882a593Smuzhiyun return EXIT_FAILURE;
36*4882a593Smuzhiyun }
37*4882a593Smuzhiyun
38*4882a593Smuzhiyun return EXIT_SUCCESS;
39*4882a593Smuzhiyun }
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