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568035b7 | 1 | /* Copyright (C) 2005-2013 Free Software Foundation, Inc. |
6ea63025 DJ |
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 | |
ab84e3ff PE |
15 | License along with the GNU C Library. If not, see |
16 | <http://www.gnu.org/licenses/>. */ | |
6ea63025 DJ |
17 | |
18 | #include <errno.h> | |
19 | #include <fcntl.h> | |
20 | #include <stddef.h> | |
21 | #include <stdio.h> | |
22 | #include <string.h> | |
23 | #include <sys/stat.h> | |
24 | #include <kernel_stat.h> | |
25 | ||
26 | #include <sysdep.h> | |
27 | #include <sys/syscall.h> | |
6ea63025 DJ |
28 | |
29 | #include <kernel-features.h> | |
30 | ||
31 | #include <xstatconv.h> | |
32 | ||
33 | /* Get information about the file NAME in BUF. */ | |
34 | ||
35 | int | |
36 | __fxstatat64 (int vers, int fd, const char *file, struct stat64 *st, int flag) | |
37 | { | |
38 | if (__builtin_expect (vers != _STAT_VER_LINUX, 0)) | |
39 | { | |
40 | __set_errno (EINVAL); | |
41 | return -1; | |
42 | } | |
43 | ||
44 | int result; | |
45 | INTERNAL_SYSCALL_DECL (err); | |
46 | struct kernel_stat kst; | |
47 | ||
48 | #ifdef __NR_newfstatat | |
49 | # ifndef __ASSUME_ATFCTS | |
50 | if (__have_atfcts >= 0) | |
51 | # endif | |
52 | { | |
53 | result = INTERNAL_SYSCALL (newfstatat, err, 4, fd, file, &kst, flag); | |
54 | # ifndef __ASSUME_ATFCTS | |
55 | if (__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1) | |
56 | && INTERNAL_SYSCALL_ERRNO (result, err) == ENOSYS) | |
57 | __have_atfcts = -1; | |
58 | else | |
59 | # endif | |
60 | if (!__builtin_expect (INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
61 | return __xstat64_conv (vers, &kst, st); | |
62 | else | |
63 | { | |
64 | __set_errno (INTERNAL_SYSCALL_ERRNO (result, err)); | |
65 | return -1; | |
66 | } | |
67 | } | |
68 | #endif | |
69 | ||
70 | #ifndef __ASSUME_ATFCTS | |
71 | if (flag & ~AT_SYMLINK_NOFOLLOW) | |
72 | { | |
73 | __set_errno (EINVAL); | |
74 | return -1; | |
75 | } | |
76 | ||
77 | char *buf = NULL; | |
78 | ||
79 | if (fd != AT_FDCWD && file[0] != '/') | |
80 | { | |
81 | size_t filelen = strlen (file); | |
82 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
83 | /* Buffer for the path name we are going to use. It consists of | |
84 | - the string /proc/self/fd/ | |
85 | - the file descriptor number | |
86 | - the file name provided. | |
87 | The final NUL is included in the sizeof. A bit of overhead | |
88 | due to the format elements compensates for possible negative | |
89 | numbers. */ | |
90 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
91 | buf = alloca (buflen); | |
92 | ||
93 | __snprintf (buf, buflen, procfd, fd, file); | |
94 | file = buf; | |
95 | } | |
96 | ||
97 | if (flag & AT_SYMLINK_NOFOLLOW) | |
6277fdab | 98 | result = INTERNAL_SYSCALL (lstat, err, 2, file, __ptrvalue (&kst)); |
6ea63025 | 99 | else |
6277fdab | 100 | result = INTERNAL_SYSCALL (stat, err, 2, file, __ptrvalue (&kst)); |
6ea63025 DJ |
101 | |
102 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
103 | return __xstat64_conv (vers, &kst, st); | |
104 | ||
105 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
106 | return -1; | |
107 | #endif | |
108 | } | |
109 | libc_hidden_def (__fxstatat64) |