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cae87e64 | 1 | /* Memory allocation next to an unmapped page. |
2b778ceb | 2 | Copyright (C) 2017-2021 Free Software Foundation, Inc. |
cae87e64 FW |
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 | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
cae87e64 FW |
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 */ |