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c90c5d41 | 1 | /* Change the protections of file relative to open directory. Linux version. |
d4697bc9 | 2 | Copyright (C) 2006-2014 Free Software Foundation, Inc. |
c90c5d41 RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
c90c5d41 RM |
18 | |
19 | #include <errno.h> | |
20 | #include <fcntl.h> | |
21 | #include <stddef.h> | |
22 | #include <stdio.h> | |
23 | #include <string.h> | |
24 | #include <unistd.h> | |
25 | #include <sys/types.h> | |
26 | #include <alloca.h> | |
7c65e900 | 27 | #include <kernel-features.h> |
c90c5d41 RM |
28 | #include <sysdep.h> |
29 | ||
30 | int | |
31 | fchmodat (fd, file, mode, flag) | |
32 | int fd; | |
33 | const char *file; | |
34 | mode_t mode; | |
35 | int flag; | |
36 | { | |
37 | if (flag & ~AT_SYMLINK_NOFOLLOW) | |
38 | { | |
39 | __set_errno (EINVAL); | |
40 | return -1; | |
41 | } | |
42 | #ifndef __NR_lchmod /* Linux so far has no lchmod syscall. */ | |
43 | if (flag & AT_SYMLINK_NOFOLLOW) | |
44 | { | |
45 | __set_errno (ENOTSUP); | |
46 | return -1; | |
47 | } | |
48 | #endif | |
49 | ||
7c65e900 UD |
50 | int result; |
51 | ||
52 | #ifdef __NR_fchmodat | |
53 | # ifndef __ASSUME_ATFCTS | |
54 | if (__have_atfcts >= 0) | |
55 | # endif | |
56 | { | |
57 | result = INLINE_SYSCALL (fchmodat, 3, fd, file, mode); | |
58 | # ifndef __ASSUME_ATFCTS | |
59 | if (result == -1 && errno == ENOSYS) | |
60 | __have_atfcts = -1; | |
61 | else | |
62 | # endif | |
63 | return result; | |
64 | } | |
65 | #endif | |
66 | ||
67 | #ifndef __ASSUME_ATFCTS | |
c90c5d41 RM |
68 | char *buf = NULL; |
69 | ||
70 | if (fd != AT_FDCWD && file[0] != '/') | |
71 | { | |
72 | size_t filelen = strlen (file); | |
a1ffb40e | 73 | if (__glibc_unlikely (filelen == 0)) |
801720e6 UD |
74 | { |
75 | __set_errno (ENOENT); | |
76 | return -1; | |
77 | } | |
78 | ||
c90c5d41 RM |
79 | static const char procfd[] = "/proc/self/fd/%d/%s"; |
80 | /* Buffer for the path name we are going to use. It consists of | |
81 | - the string /proc/self/fd/ | |
82 | - the file descriptor number | |
83 | - the file name provided. | |
84 | The final NUL is included in the sizeof. A bit of overhead | |
85 | due to the format elements compensates for possible negative | |
86 | numbers. */ | |
87 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
88 | buf = alloca (buflen); | |
89 | ||
90 | __snprintf (buf, buflen, procfd, fd, file); | |
91 | file = buf; | |
92 | } | |
93 | ||
c90c5d41 RM |
94 | INTERNAL_SYSCALL_DECL (err); |
95 | ||
7c65e900 | 96 | # ifdef __NR_lchmod |
c90c5d41 RM |
97 | if (flag & AT_SYMLINK_NOFOLLOW) |
98 | result = INTERNAL_SYSCALL (lchmod, err, 2, file, mode); | |
99 | else | |
7c65e900 | 100 | # endif |
c90c5d41 RM |
101 | result = INTERNAL_SYSCALL (chmod, err, 2, file, mode); |
102 | ||
a1ffb40e | 103 | if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (result, err))) |
c90c5d41 RM |
104 | { |
105 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
106 | result = -1; | |
107 | } | |
108 | ||
109 | return result; | |
7c65e900 | 110 | #endif |
c90c5d41 | 111 | } |