1 | /* Memory allocation next to an unmapped page. |
2 | Copyright (C) 2017-2024 Free Software Foundation, Inc. |
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 | <https://www.gnu.org/licenses/>. */ |
18 | |
19 | #ifndef SUPPORT_NEXT_TO_FAULT_H |
20 | #define SUPPORT_NEXT_TO_FAULT_H |
21 | |
22 | #include <sys/cdefs.h> |
23 | #include <sys/types.h> |
24 | |
25 | __BEGIN_DECLS |
26 | |
27 | /* The memory region created by next_to_fault_allocate. */ |
28 | struct support_next_to_fault |
29 | { |
30 | /* The user data. */ |
31 | char *buffer; |
32 | size_t length; |
33 | |
34 | /* The entire allocated region. */ |
35 | void *region_start; |
36 | size_t region_size; |
37 | }; |
38 | |
39 | /* Allocate a buffer of SIZE bytes just before a page which is mapped |
40 | with PROT_NONE (so that overrunning the buffer will cause a |
41 | fault). */ |
42 | struct support_next_to_fault support_next_to_fault_allocate (size_t size); |
43 | |
44 | /* Deallocate the memory region allocated by |
45 | next_to_fault_allocate. */ |
46 | void support_next_to_fault_free (struct support_next_to_fault *); |
47 | |
48 | #endif /* SUPPORT_NEXT_TO_FAULT_H */ |
49 | |