1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
|
/**
* slibc — Yet another C library
* Copyright © 2015, 2016 Mattias Andrée (maandree@member.fsf.org)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <errno.h>
/**
* `posix_memalign(p, b, n)` is equivalent to
* `(*p = memalign(b, n), *p ? 0 : errno)`, except
* `boundary` must also be a multiple of `sizeof(void*)`,
* and `errno` is unspecified.
*
* As a GNU-compliant slibc extension, memory allocated
* with this function can be freed with `free`.
*
* @etymology (POSIX)-extension: (mem)ory alignment.
*
* @param ptrptr Output parameter for the allocated memory.
* @param boundary The alignment.
* @param size The number of bytes to allocated.
* @return Zero on success, a value for `errno` on error.
*
* @throws ENOMEM The process cannot allocate more memory.
* @throws EINVAL If `boundary` is not a power-of-two multiple of `sizeof(void*)`.
*
* @since Always.
*/
int posix_memalign(void** ptrptr, size_t boundary, size_t size)
{
if (boundary < sizeof(void*))
return EINVAL;
*ptrptr = memalign(boundary, size);
return *ptrptr ? 0 : errno;
}
|
