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
71
72
73
|
/*
* Copyright (c) 2008-2010 Wind River Systems; see
* guts/COPYRIGHT for information.
*
* static int
* wrap_fchmodat(int dirfd, const char *path, mode_t mode, int flags) {
* int rc = -1;
*/
pseudo_msg_t *msg;
struct stat64 buf;
int save_errno;
#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS
if (dirfd != AT_FDCWD) {
errno = ENOSYS;
return -1;
}
if (flags & AT_SYMLINK_NOFOLLOW) {
rc = real___lxstat64(_STAT_VER, path, &buf);
} else {
rc = real___xstat64(_STAT_VER, path, &buf);
}
#else
rc = real___fxstatat64(_STAT_VER, dirfd, path, &buf, flags);
#endif
if (rc == -1) {
return rc;
}
if (S_ISLNK(buf.st_mode)) {
/* we don't really support chmod of a symlink */
errno = ENOSYS;
return -1;
}
save_errno = errno;
/* purely for debugging purposes: check whether file
* is already in database.
*/
msg = pseudo_client_op(OP_STAT, 0, -1, -1, path, &buf);
if (!msg || msg->result != RESULT_SUCCEED) {
pseudo_debug(2, "chmodat to 0%o on %d/%s, ino %llu, new file.\n",
mode, dirfd, path, (unsigned long long) buf.st_ino);
}
/* user bits added so "root" can always access files. */
#ifdef PSEUDO_NO_REAL_AT_FUNCTIONS
/* note: if path was a symlink, and AT_NOFOLLOW_SYMLINKS was
* specified, we already bailed previously. */
real_chmod(path, PSEUDO_FS_MODE(mode));
#else
real_fchmodat(dirfd, path, PSEUDO_FS_MODE(mode), flags);
#endif
/* we ignore a failure from underlying fchmod, because pseudo
* may believe you are permitted to change modes that the filesystem
* doesn't.
*/
buf.st_mode = (buf.st_mode & ~07777) | (mode & 07777);
msg = pseudo_client_op(OP_CHMOD, 0, -1, dirfd, path, &buf);
if (!msg) {
errno = ENOSYS;
rc = -1;
} else if (msg->result != RESULT_SUCCEED) {
errno = EPERM;
rc = -1;
} else {
rc = 0;
}
/* return rc;
* }
*/
|