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c01ae97e | 1 | /* File identity for the dynamic linker. Generic POSIX.1 version. |
f7a9f785 | 2 | Copyright (C) 2015-2016 Free Software Foundation, Inc. |
c01ae97e RM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <stdbool.h> | |
20 | #include <sys/stat.h> | |
21 | ||
22 | /* For POSIX.1 systems, the pair of st_dev and st_ino constitute | |
23 | a unique identifier for a file. */ | |
24 | struct r_file_id | |
25 | { | |
26 | dev_t dev; | |
27 | ino64_t ino; | |
28 | }; | |
29 | ||
30 | /* Sample FD to fill in *ID. Returns true on success. | |
31 | On error, returns false, with errno set. */ | |
32 | static inline bool | |
33 | _dl_get_file_id (int fd, struct r_file_id *id) | |
34 | { | |
35 | struct stat64 st; | |
36 | ||
37 | if (__glibc_unlikely (__fxstat64 (_STAT_VER, fd, &st) < 0)) | |
38 | return false; | |
39 | ||
40 | id->dev = st.st_dev; | |
41 | id->ino = st.st_ino; | |
42 | return true; | |
43 | } | |
44 | ||
45 | /* Compare two results from _dl_get_file_id for equality. */ | |
46 | static inline bool | |
47 | _dl_file_id_match_p (const struct r_file_id *a, const struct r_file_id *b) | |
48 | { | |
49 | return a->dev == b->dev && a->ino == b->ino; | |
50 | } |