]>
Commit | Line | Data |
---|---|---|
a334319f | 1 | /* Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc. |
ba55e591 AJ |
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 | |
41bdb6e2 AJ |
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. | |
ba55e591 AJ |
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 | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
ba55e591 | 13 | |
41bdb6e2 AJ |
14 | You should have received a copy of the GNU Lesser General Public |
15 | License along with the GNU C Library; if not, write to the Free | |
16 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
17 | 02111-1307 USA. */ | |
ba55e591 AJ |
18 | |
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
21 | ||
22 | #include <sysdep.h> | |
23 | #include <sys/syscall.h> | |
24 | #include <shlib-compat.h> | |
25 | #include <bp-checks.h> | |
26 | ||
27 | #include <linux/posix_types.h> | |
a334319f | 28 | #include "kernel-features.h" |
ba55e591 AJ |
29 | |
30 | /* | |
31 | In Linux 2.1.x the chown functions have been changed. A new function lchown | |
32 | was introduced. The new chown now follows symlinks - the old chown and the | |
33 | new lchown do not follow symlinks. | |
34 | The new lchown function has the same number as the old chown had and the | |
35 | new chown has a new number. When compiling with headers from Linux > 2.1.8x | |
36 | it's impossible to run this libc with older kernels. In these cases libc | |
37 | has therefore to route calls to chown to the old chown function. | |
38 | */ | |
39 | ||
ba55e591 AJ |
40 | /* Running under Linux > 2.1.80. */ |
41 | ||
42 | #ifdef __NR_chown32 | |
ba55e591 AJ |
43 | # if __ASSUME_32BITUIDS == 0 |
44 | /* This variable is shared with all files that need to check for 32bit | |
45 | uids. */ | |
46 | extern int __libc_missing_32bit_uids; | |
47 | # endif | |
48 | #endif /* __NR_chown32 */ | |
49 | ||
50 | int | |
51 | __real_chown (const char *file, uid_t owner, gid_t group) | |
52 | { | |
c3293cba UD |
53 | #if __ASSUME_32BITUIDS > 0 |
54 | return INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group); | |
55 | #else | |
ba55e591 AJ |
56 | static int __libc_old_chown; |
57 | int result; | |
58 | ||
59 | if (!__libc_old_chown) | |
60 | { | |
61 | int saved_errno = errno; | |
c3293cba | 62 | # ifdef __NR_chown32 |
ba55e591 AJ |
63 | if (__libc_missing_32bit_uids <= 0) |
64 | { | |
65 | int result; | |
66 | int saved_errno = errno; | |
67 | ||
68 | result = INLINE_SYSCALL (chown32, 3, CHECK_STRING (file), owner, group); | |
69 | if (result == 0 || errno != ENOSYS) | |
70 | return result; | |
71 | ||
72 | __set_errno (saved_errno); | |
73 | __libc_missing_32bit_uids = 1; | |
74 | } | |
c3293cba | 75 | # endif /* __NR_chown32 */ |
ba55e591 AJ |
76 | if (((owner + 1) > (uid_t) ((__kernel_uid_t) -1U)) |
77 | || ((group + 1) > (gid_t) ((__kernel_gid_t) -1U))) | |
78 | { | |
79 | __set_errno (EINVAL); | |
80 | return -1; | |
81 | } | |
82 | ||
83 | result = INLINE_SYSCALL (chown, 3, CHECK_STRING (file), owner, group); | |
84 | ||
85 | if (result >= 0 || errno != ENOSYS) | |
86 | return result; | |
87 | ||
88 | __set_errno (saved_errno); | |
89 | __libc_old_chown = 1; | |
90 | } | |
91 | ||
92 | return __lchown (file, owner, group); | |
c3293cba | 93 | #endif |
ba55e591 AJ |
94 | } |
95 | ||
96 | ||
97 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
98 | /* Compiling for compatibiity. */ | |
99 | int | |
d3a4a571 | 100 | attribute_compat_text_section |
ba55e591 AJ |
101 | __chown_is_lchown (const char *file, uid_t owner, gid_t group) |
102 | { | |
103 | return __lchown (file, owner, group); | |
104 | } | |
105 | #endif | |
106 | ||
107 | #if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_1) | |
108 | strong_alias (__chown_is_lchown, _chown_is_lchown) | |
109 | compat_symbol (libc, __chown_is_lchown, __chown, GLIBC_2_0); | |
110 | compat_symbol (libc, _chown_is_lchown, chown, GLIBC_2_0); | |
111 | ||
112 | strong_alias (__real_chown, _real_chown) | |
113 | versioned_symbol (libc, __real_chown, __chown, GLIBC_2_1); | |
114 | versioned_symbol (libc, _real_chown, chown, GLIBC_2_1); | |
37ba7d66 | 115 | libc_hidden_ver (__real_chown, __chown) |
ba55e591 AJ |
116 | #else |
117 | strong_alias (__real_chown, __chown) | |
37ba7d66 | 118 | libc_hidden_def (__chown) |
ba55e591 AJ |
119 | weak_alias (__real_chown, chown) |
120 | #endif |