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536d1a8d | 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 | /* Ho hum, if fxstatat == fxstatat64 we must get rid of the prototype or gcc | |
20 | will complain since they don't strictly match. */ | |
21 | #define __fxstatat64 __fxstatat64_disable | |
22 | ||
23 | #include <errno.h> | |
24 | #include <fcntl.h> | |
25 | #include <stddef.h> | |
26 | #include <stdio.h> | |
27 | #include <sys/stat.h> | |
28 | #include <kernel_stat.h> | |
29 | ||
30 | #include <sysdep.h> | |
31 | #include <sys/syscall.h> | |
32 | #include <bp-checks.h> | |
33 | ||
34 | #include <xstatconv.h> | |
35 | ||
36 | /* Get information about the file NAME in BUF. */ | |
37 | int | |
38 | __fxstatat (int vers, int fd, const char *file, struct stat *st, int flag) | |
39 | { | |
40 | if (flag & ~AT_SYMLINK_NOFOLLOW) | |
41 | { | |
42 | __set_errno (EINVAL); | |
43 | return -1; | |
44 | } | |
45 | ||
46 | char *buf = NULL; | |
47 | ||
48 | if (fd != AT_FDCWD && file[0] != '/') | |
49 | { | |
50 | size_t filelen = strlen (file); | |
51 | static const char procfd[] = "/proc/self/fd/%d/%s"; | |
52 | /* Buffer for the path name we are going to use. It consists of | |
53 | - the string /proc/self/fd/ | |
54 | - the file descriptor number | |
55 | - the file name provided. | |
56 | The final NUL is included in the sizeof. A bit of overhead | |
57 | due to the format elements compensates for possible negative | |
58 | numbers. */ | |
59 | size_t buflen = sizeof (procfd) + sizeof (int) * 3 + filelen; | |
60 | buf = alloca (buflen); | |
61 | ||
62 | __snprintf (buf, buflen, procfd, fd, file); | |
63 | file = buf; | |
64 | } | |
65 | ||
66 | int result; | |
67 | INTERNAL_SYSCALL_DECL (err); | |
68 | ||
69 | if (vers == _STAT_VER_KERNEL) | |
70 | { | |
71 | if (flag & AT_SYMLINK_NOFOLLOW) | |
72 | result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file), | |
73 | CHECK_1 ((struct kernel_stat *) st)); | |
74 | else | |
75 | result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file), | |
76 | CHECK_1 ((struct kernel_stat *) st)); | |
77 | ||
78 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
79 | return result; | |
80 | } | |
26cec518 | 81 | #ifdef STAT_IS_KERNEL_STAT |
536d1a8d UD |
82 | else |
83 | { | |
84 | __set_errno (EINVAL); | |
85 | return -1; | |
86 | } | |
26cec518 UD |
87 | #else |
88 | struct kernel_stat kst; | |
89 | ||
90 | if (flag & AT_SYMLINK_NOFOLLOW) | |
91 | result = INTERNAL_SYSCALL (lstat, err, 2, CHECK_STRING (file), | |
92 | __ptrvalue (&kst)); | |
93 | else | |
94 | result = INTERNAL_SYSCALL (stat, err, 2, CHECK_STRING (file), | |
95 | __ptrvalue (&kst)); | |
96 | ||
97 | if (__builtin_expect (!INTERNAL_SYSCALL_ERROR_P (result, err), 1)) | |
98 | return __xstat_conv (vers, &kst, st); | |
99 | #endif | |
100 | ||
101 | __atfct_seterrno (INTERNAL_SYSCALL_ERRNO (result, err), fd, buf); | |
102 | ||
103 | return -1; | |
104 | } | |
105 | #ifdef XSTAT_IS_XSTAT64 | |
106 | # undef __fxstatat64 | |
107 | strong_alias (__fxstatat, __fxstatat64); | |
108 | #endif |