1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
|
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <string.h>
#include <errno.h>
int
main (int argc, char *argv[])
{
const char *glfs_dir = NULL, *filepath = NULL;
DIR *dirfd = NULL;
int filefd = 0, ret = 0;
struct stat stbuf = {0, };
size_t size_before_write = 0;
glfs_dir = argv[1];
filepath = argv[2];
dirfd = opendir (glfs_dir);
if (dirfd == NULL) {
fprintf (stderr, "opening directory failed (%s)\n",
strerror (errno));
goto err;
}
filefd = open (filepath, O_RDWR);
if (filefd < 0) {
fprintf (stderr, "open failed on path %s (%s)\n", filepath,
strerror (errno));
goto err;
}
ret = stat (filepath, &stbuf);
if (ret < 0) {
fprintf (stderr, "stat failed on path %s (%s)\n", filepath,
strerror (errno));
goto err;
}
size_before_write = stbuf.st_size;
ret = write (filefd, "testdata", strlen ("testdata123") + 1);
if (ret <= 0) {
fprintf (stderr, "write failed (%s)\n", strerror (errno));
goto err;
}
while (readdir (dirfd)) {
/* do nothing */
}
ret = stat (filepath, &stbuf);
if (ret < 0) {
fprintf (stderr, "stat failed on path %s (%s)\n",
strerror (errno));
goto err;
}
if (stbuf.st_size == size_before_write) {
fprintf (stderr, "file size (%lu) has not changed even after "
"its written to\n", stbuf.st_size);
goto err;
}
return 0;
err:
return -1;
}
|
