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d4697bc9 | 1 | /* Copyright (C) 2005-2014 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 | |
59ba27a6 PE |
15 | License along with the GNU C Library; if not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
26cec518 UD |
17 | |
18 | /* Ho hum, since fxstatat == fxstatat64 we must get rid of the | |
19 | prototype or gcc will complain since they don't strictly match. */ | |
20 | #define __fxstatat64 __fxstatat64_disable | |
21 | ||
22 | #include <errno.h> | |
23 | #include <fcntl.h> | |
24 | #include <stddef.h> | |
25 | #include <stdio.h> | |
478f33c9 | 26 | #include <string.h> |
26cec518 UD |
27 | #include <sys/stat.h> |
28 | ||
29 | #include <sysdep.h> | |
7c65e900 | 30 | #include <kernel-features.h> |
26cec518 | 31 | #include <sys/syscall.h> |
26cec518 | 32 | |
7c65e900 | 33 | |
26cec518 UD |
34 | /* Get information about the file NAME relative to FD in ST. */ |
35 | int | |
36 | __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) | |
37 | { | |
7c65e900 UD |
38 | if (vers != _STAT_VER_KERNEL && vers != _STAT_VER_LINUX) |
39 | { | |
40 | __set_errno (EINVAL); | |
41 | return -1; | |
42 | } | |
43 | ||
44 | int res; | |
45 | ||
46 | #ifdef __NR_newfstatat | |
47 | # ifndef __ASSUME_ATFCTS | |
48 | if (__have_atfcts >= 0) | |
49 | # endif | |
50 | { | |
51 | res = INLINE_SYSCALL (newfstatat, 4, fd, file, st, flag); | |
52 | # ifndef __ASSUME_ATFCTS | |
53 | if (res == -1 && errno == ENOSYS) | |
54 | __have_atfcts = -1; | |
55 | else | |
56 | # endif | |
57 | return res; | |
58 | } | |
59 | #endif | |
60 | ||
61 | #ifndef __ASSUME_ATFCTS | |
62 | if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0) | |
26cec518 UD |
63 | { |
64 | __set_errno (EINVAL); | |
65 | return -1; | |
66 | } | |
67 | ||
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 | ||
26cec518 UD |
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 | ||
94 | INTERNAL_SYSCALL_DECL (err); | |
26cec518 UD |
95 | |
96 | if (flag & AT_SYMLINK_NOFOLLOW) | |
f3aae3f3 | 97 | res = INTERNAL_SYSCALL (lstat, err, 2, file, st); |
26cec518 | 98 | else |
f3aae3f3 | 99 | res = INTERNAL_SYSCALL (stat, err, 2, file, st); |
26cec518 | 100 | |
a1ffb40e | 101 | if (__glibc_unlikely (INTERNAL_SYSCALL_ERROR_P (res, err))) |
baf532c1 UD |
102 | { |
103 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (res, err), fd, buf); | |
104 | res = -1; | |
105 | } | |
26cec518 UD |
106 | |
107 | return res; | |
7c65e900 | 108 | #endif |
26cec518 | 109 | } |
d369ad76 | 110 | libc_hidden_def (__fxstatat) |
26cec518 UD |
111 | #undef __fxstatat64 |
112 | strong_alias (__fxstatat, __fxstatat64); | |
bd7d6b40 | 113 | strong_alias (__fxstatat64, __GI___fxstatat64) |