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958f238f | 1 | /* Copyright (C) 1998, 1999 Free Software Foundation, Inc. |
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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 Library General Public License as | |
6 | published by the Free Software Foundation; either version 2 of the | |
7 | 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 | Library General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Library General Public | |
15 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
16 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
17 | Boston, MA 02111-1307, USA. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <unistd.h> | |
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21 | |
22 | #include <sysdep.h> | |
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23 | #include <sys/syscall.h> |
24 | ||
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25 | #include <kernel-features.h> |
26 | ||
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27 | /* |
28 | In Linux 2.1.x the chown functions have been changed. A new function lchown | |
29 | was introduced. The new chown now follows symlinks - the old chown and the | |
30 | new lchown do not follow symlinks. | |
31 | The new lchown function has the same number as the old chown had and the | |
32 | new chown has a new number. When compiling with headers from Linux > 2.1.8x | |
33 | it's impossible to run this libc with older kernels. In these cases libc | |
34 | has therefore to route calls to chown to the old chown function. | |
35 | */ | |
36 | ||
37 | extern int __syscall_chown (const char *__file, | |
38 | uid_t __owner, gid_t __group); | |
958f238f | 39 | #if defined __NR_lchown || __ASSUME_LCHOWN_SYSCALL > 0 |
b937f591 | 40 | /* Running under Linux > 2.1.80. */ |
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41 | |
42 | ||
43 | int | |
44 | __real_chown (const char *file, uid_t owner, gid_t group) | |
45 | { | |
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46 | # if __ASSUME_LCHOWN_SYSCALL == 0 |
47 | static int __libc_old_chown; | |
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48 | int result; |
49 | ||
50 | if (!__libc_old_chown) | |
51 | { | |
52 | int saved_errno = errno; | |
0dee6738 | 53 | result = INLINE_SYSCALL (chown, 3, file, owner, group); |
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54 | |
55 | if (result >= 0 || errno != ENOSYS) | |
56 | return result; | |
57 | ||
58 | __set_errno (saved_errno); | |
59 | __libc_old_chown = 1; | |
60 | } | |
61 | ||
62 | return __lchown (file, owner, group); | |
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63 | # else |
64 | return INLINE_SYSCALL (chown, 3, file, owner, group); | |
65 | # endif | |
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66 | } |
67 | #endif | |
68 | ||
69 | ||
958f238f | 70 | #if !defined __NR_lchown && __ASSUME_LCHOWN_SYSCALL == 0 |
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71 | /* Compiling under older kernels. */ |
72 | int | |
73 | __chown_is_lchown (const char *file, uid_t owner, gid_t group) | |
74 | { | |
0dee6738 | 75 | return INLINE_SYSCALL (chown, 3, file, owner, group); |
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76 | } |
77 | #elif defined HAVE_ELF && defined PIC && defined DO_VERSIONING | |
78 | /* Compiling for compatibiity. */ | |
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79 | int |
80 | __chown_is_lchown (const char *file, uid_t owner, gid_t group) | |
81 | { | |
82 | return __lchown (file, owner, group); | |
83 | } | |
84 | #endif | |
85 | ||
86 | #if defined HAVE_ELF && defined PIC && defined DO_VERSIONING | |
87 | strong_alias (__chown_is_lchown, _chown_is_lchown) | |
88 | symbol_version (__chown_is_lchown, __chown, GLIBC_2.0); | |
89 | symbol_version (_chown_is_lchown, chown, GLIBC_2.0); | |
90 | ||
91 | # ifdef __NR_lchown | |
92 | strong_alias (__real_chown, _real_chown) | |
93 | default_symbol_version (__real_chown, __chown, GLIBC_2.1); | |
94 | default_symbol_version (_real_chown, chown, GLIBC_2.1); | |
95 | # else | |
96 | strong_alias (__chown_is_lchown, __chown_is_lchown21) | |
97 | strong_alias (__chown_is_lchown, _chown_is_lchown21) | |
98 | default_symbol_version (__chown_is_lchown21, __chown, GLIBC_2.1); | |
99 | default_symbol_version (_chown_is_lchown21, chown, GLIBC_2.1); | |
100 | # endif | |
101 | #else | |
102 | # ifdef __NR_lchown | |
103 | strong_alias (__real_chown, __chown) | |
104 | weak_alias (__real_chown, chown) | |
105 | # else | |
106 | strong_alias (__chown_is_lchown, __chown) | |
107 | weak_alias (__chown_is_lchown, chown) | |
108 | # endif | |
109 | #endif |