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c90c5d41 RM |
1 | /* Change the protections of file relative to open directory. Linux version. |
2 | Copyright (C) 2006 Free Software Foundation, Inc. | |
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 | |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <fcntl.h> | |
22 | #include <stddef.h> | |
23 | #include <stdio.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <sys/types.h> | |
27 | #include <alloca.h> | |
7c65e900 | 28 | #include <kernel-features.h> |
c90c5d41 RM |
29 | #include <sysdep.h> |
30 | ||
31 | int | |
32 | fchmodat (fd, file, mode, flag) | |
33 | int fd; | |
34 | const char *file; | |
35 | mode_t mode; | |
36 | int flag; | |
37 | { | |
38 | if (flag & ~AT_SYMLINK_NOFOLLOW) | |
39 | { | |
40 | __set_errno (EINVAL); | |
41 | return -1; | |
42 | } | |
43 | #ifndef __NR_lchmod /* Linux so far has no lchmod syscall. */ | |
44 | if (flag & AT_SYMLINK_NOFOLLOW) | |
45 | { | |
46 | __set_errno (ENOTSUP); | |
47 | return -1; | |
48 | } | |
49 | #endif | |
50 | ||
7c65e900 UD |
51 | int result; |
52 | ||
53 | #ifdef __NR_fchmodat | |
54 | # ifndef __ASSUME_ATFCTS | |
55 | if (__have_atfcts >= 0) | |
56 | # endif | |
57 | { | |
58 | result = INLINE_SYSCALL (fchmodat, 3, fd, file, mode); | |
59 | # ifndef __ASSUME_ATFCTS | |
60 | if (result == -1 && errno == ENOSYS) | |
61 | __have_atfcts = -1; | |
62 | else | |
63 | # endif | |
64 | return result; | |
65 | } | |
66 | #endif | |
67 | ||
68 | #ifndef __ASSUME_ATFCTS | |
c90c5d41 RM |
69 | char *buf = NULL; |
70 | ||
71 | if (fd != AT_FDCWD && file[0] != '/') | |
72 | { | |
73 | size_t filelen = strlen (file); | |
74 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
75 | /* Buffer for the path name we are going to use. It consists of | |
76 | - the string /proc/self/fd/ | |
77 | - the file descriptor number | |
78 | - the file name provided. | |
79 | The final NUL is included in the sizeof. A bit of overhead | |
80 | due to the format elements compensates for possible negative | |
81 | numbers. */ | |
82 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
83 | buf = alloca (buflen); | |
84 | ||
85 | __snprintf (buf, buflen, procfd, fd, file); | |
86 | file = buf; | |
87 | } | |
88 | ||
c90c5d41 RM |
89 | INTERNAL_SYSCALL_DECL (err); |
90 | ||
7c65e900 | 91 | # ifdef __NR_lchmod |
c90c5d41 RM |
92 | if (flag & AT_SYMLINK_NOFOLLOW) |
93 | result = INTERNAL_SYSCALL (lchmod, err, 2, file, mode); | |
94 | else | |
7c65e900 | 95 | # endif |
c90c5d41 RM |
96 | result = INTERNAL_SYSCALL (chmod, err, 2, file, mode); |
97 | ||
98 | if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 0)) | |
99 | { | |
100 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
101 | result = -1; | |
102 | } | |
103 | ||
104 | return result; | |
7c65e900 | 105 | #endif |
c90c5d41 | 106 | } |