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6ddd37a4 | 1 | /* Copyright (C) 2005,2006 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 | |
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. */ | |
18 | ||
19 | #include <errno.h> | |
20 | #include <fcntl.h> | |
21 | #include <stddef.h> | |
22 | #include <stdio.h> | |
0e586bf8 | 23 | #include <string.h> |
26cec518 UD |
24 | #include <sys/stat.h> |
25 | #include <kernel_stat.h> | |
26 | ||
27 | #include <sysdep.h> | |
28 | #include <sys/syscall.h> | |
29 | #include <bp-checks.h> | |
30 | ||
6ddd37a4 | 31 | #include <kernel-features.h> |
26cec518 UD |
32 | |
33 | #if __ASSUME_STAT64_SYSCALL == 0 | |
34 | # include <xstatconv.h> | |
35 | #endif | |
36 | ||
37 | #ifdef __NR_stat64 | |
38 | # if __ASSUME_STAT64_SYSCALL == 0 | |
39 | /* The variable is shared between all wrappers around *stat64 calls. | |
40 | This is the definition. */ | |
41 | extern int __have_no_stat64; | |
42 | # endif | |
43 | #endif | |
44 | ||
45 | /* Get information about the file NAME in BUF. */ | |
46 | ||
47 | int | |
48 | __fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag) | |
49 | { | |
50 | if (flag & ~AT_SYMLINK_NOFOLLOW) | |
51 | { | |
52 | __set_errno (EINVAL); | |
53 | return -1; | |
54 | } | |
55 | ||
56 | char *buf = NULL; | |
57 | ||
58 | if (fd != AT_FDCWD && file[0] != '/') | |
59 | { | |
60 | size_t filelen = strlen (file); | |
61 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
62 | /* Buffer for the path name we are going to use. It consists of | |
63 | - the string /proc/self/fd/ | |
64 | - the file descriptor number | |
65 | - the file name provided. | |
66 | The final NUL is included in the sizeof. A bit of overhead | |
67 | due to the format elements compensates for possible negative | |
68 | numbers. */ | |
69 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
70 | buf = alloca (buflen); | |
71 | ||
72 | __snprintf (buf, buflen, procfd, fd, file); | |
73 | file = buf; | |
74 | } | |
75 | ||
76 | int result; | |
77 | INTERNAL_SYSCALL_DECL (err); | |
78 | ||
79 | #if __ASSUME_STAT64_SYSCALL > 0 | |
80 | if (flag & AT_SYMLINK_NOFOLLOW) | |
81 | result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file), | |
82 | CHECK_1 (st)); | |
83 | else | |
84 | result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file), | |
85 | CHECK_1 (st)); | |
86 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
87 | { | |
88 | # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0 | |
89 | if (st->__st_ino != (__ino_t) st->st_ino) | |
90 | st->st_ino = st->__st_ino; | |
91 | # endif | |
92 | return result; | |
93 | } | |
94 | #else | |
95 | struct kernel_stat kst; | |
96 | # if defined __NR_stat64 | |
97 | if (! __have_no_stat64) | |
98 | { | |
99 | if (flag & AT_SYMLINK_NOFOLLOW) | |
100 | result = INTERNAL_SYSCALL (lstat64, err, 2, CHECK_STRING (file), | |
101 | CHECK_1 (st)); | |
102 | else | |
103 | result = INTERNAL_SYSCALL (stat64, err, 2, CHECK_STRING (file), | |
104 | CHECK_1 (st)); | |
105 | ||
106 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
107 | { | |
108 | # if defined _HAVE_STAT64___ST_INO && __ASSUME_ST_INO_64_BIT == 0 | |
109 | if (st->__st_ino != (__ino_t) st->st_ino) | |
110 | st->st_ino = st->__st_ino; | |
111 | # endif | |
112 | return result; | |
113 | } | |
114 | if (INTERNAL_SYSCALL_ERRNO (result, err) != ENOSYS) | |
115 | goto fail; | |
116 | ||
117 | __have_no_stat64 = 1; | |
118 | } | |
119 | # endif | |
120 | ||
121 | if (flag & AT_SYMLINK_NOFOLLOW) | |
122 | result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file), | |
123 | __ptrvalue (&kst)); | |
124 | else | |
125 | result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file), | |
126 | __ptrvalue (&kst)); | |
127 | ||
128 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
129 | return __xstat64_conv (vers, &kst, st); | |
130 | ||
131 | fail: | |
baf532c1 | 132 | #endif |
26cec518 UD |
133 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); |
134 | ||
135 | return -1; | |
26cec518 | 136 | } |