]>
Commit | Line | Data |
---|---|---|
ffb7875d | 1 | /* Copyright (C) 2005-2012 Free Software Foundation, Inc. |
26cec518 UD |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
26cec518 UD |
17 | |
18 | #include <errno.h> | |
19 | #include <fcntl.h> | |
20 | #include <stdio.h> | |
478f33c9 | 21 | #include <string.h> |
26cec518 UD |
22 | #include <unistd.h> |
23 | ||
24 | #include <sysdep.h> | |
25 | #include <sys/syscall.h> | |
26 | #include <shlib-compat.h> | |
27 | #include <bp-checks.h> | |
28 | ||
29 | #include <linux/posix_types.h> | |
6ddd37a4 | 30 | #include <kernel-features.h> |
26cec518 | 31 | |
26cec518 UD |
32 | |
33 | int | |
34 | fchownat (int fd, const char *file, uid_t owner, gid_t group, int flag) | |
35 | { | |
2d1e6277 UD |
36 | int result; |
37 | ||
38 | #ifdef __NR_fchownat | |
39 | # ifndef __ASSUME_ATFCTS | |
40 | if (__have_atfcts >= 0) | |
41 | # endif | |
42 | { | |
43 | result = INLINE_SYSCALL (fchownat, 5, fd, file, owner, group, flag); | |
44 | # ifndef __ASSUME_ATFCTS | |
45 | if (result == -1 && errno == ENOSYS) | |
46 | __have_atfcts = -1; | |
47 | else | |
48 | # endif | |
49 | return result; | |
50 | } | |
51 | #endif | |
52 | ||
53 | #ifndef __ASSUME_ATFCTS | |
26cec518 UD |
54 | if (flag & ~AT_SYMLINK_NOFOLLOW) |
55 | { | |
56 | __set_errno (EINVAL); | |
57 | return -1; | |
58 | } | |
59 | ||
60 | char *buf = NULL; | |
61 | ||
62 | if (fd != AT_FDCWD && file[0] != '/') | |
63 | { | |
64 | size_t filelen = strlen (file); | |
801720e6 UD |
65 | if (__builtin_expect (filelen == 0, 0)) |
66 | { | |
67 | __set_errno (ENOENT); | |
68 | return -1; | |
69 | } | |
70 | ||
26cec518 UD |
71 | static const char procfd[] = "/proc/self/fd/%d/%s"; |
72 | /* Buffer for the path name we are going to use. It consists of | |
73 | - the string /proc/self/fd/ | |
74 | - the file descriptor number | |
75 | - the file name provided. | |
76 | The final NUL is included in the sizeof. A bit of overhead | |
77 | due to the format elements compensates for possible negative | |
78 | numbers. */ | |
79 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
80 | buf = alloca (buflen); | |
81 | ||
82 | __snprintf (buf, buflen, procfd, fd, file); | |
83 | file = buf; | |
84 | } | |
85 | ||
26cec518 UD |
86 | INTERNAL_SYSCALL_DECL (err); |
87 | ||
f1122ec3 UD |
88 | if (flag & AT_SYMLINK_NOFOLLOW) |
89 | result = INTERNAL_SYSCALL (lchown32, err, 3, CHECK_STRING (file), owner, | |
90 | group); | |
91 | else | |
92 | result = INTERNAL_SYSCALL (chown32, err, 3, CHECK_STRING (file), owner, | |
93 | group); | |
26cec518 | 94 | |
f1122ec3 | 95 | if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0)) |
26cec518 | 96 | { |
f1122ec3 | 97 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); |
26cec518 UD |
98 | return -1; |
99 | } | |
26cec518 | 100 | |
26cec518 | 101 | return result; |
0f289b2a | 102 | |
2d1e6277 | 103 | #endif |
26cec518 | 104 | } |