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f5e7e959 | 1 | /* Repeating a memory blob, with alias mapping optimization. |
2b778ceb | 2 | Copyright (C) 2018-2021 Free Software Foundation, Inc. |
f5e7e959 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/>. */ |
f5e7e959 FW |
18 | |
19 | #ifndef SUPPORT_BLOB_REPEAT_H | |
20 | #define SUPPORT_BLOB_REPEAT_H | |
21 | ||
22 | #include <stdbool.h> | |
23 | #include <stddef.h> | |
24 | ||
25 | struct support_blob_repeat | |
26 | { | |
27 | void *start; | |
28 | size_t size; | |
29 | bool use_malloc; | |
30 | }; | |
31 | ||
32 | /* Return an allocation of COUNT elements, each of ELEMENT_SIZE bytes, | |
33 | initialized with the bytes starting at ELEMENT. The memory is | |
34 | writable (and thus counts towards the commit charge). In case of | |
35 | on error, all members of the return struct are zero-initialized, | |
36 | and errno is set accordingly. */ | |
37 | struct support_blob_repeat support_blob_repeat_allocate (const void *element, | |
38 | size_t element_size, | |
39 | size_t count); | |
40 | ||
0e28cfff FW |
41 | /* Like support_blob_repeat_allocate, except that copy-on-write |
42 | semantics are disabled. This means writing to one part of the blob | |
43 | can affect other parts. It is possible to map non-shared memory | |
44 | over parts of the resulting blob using MAP_ANONYMOUS | MAP_FIXED | |
45 | | MAP_PRIVATE, so that writes to these parts do not affect | |
46 | others. */ | |
47 | struct support_blob_repeat support_blob_repeat_allocate_shared | |
48 | (const void *element, size_t element_size, size_t count); | |
49 | ||
50 | /* Deallocate the blob created by support_blob_repeat_allocate or | |
51 | support_blob_repeat_allocate_shared. */ | |
f5e7e959 FW |
52 | void support_blob_repeat_free (struct support_blob_repeat *); |
53 | ||
54 | #endif /* SUPPORT_BLOB_REPEAT_H */ |