1 /*
2 * Copyright (c) 2003 Gunnar Ritter
3 *
4 * This software is provided 'as-is', without any express or implied
5 * warranty. In no event will the authors be held liable for any damages
6 * arising from the use of this software.
7 *
8 * Permission is granted to anyone to use this software for any purpose,
9 * including commercial applications, and to alter it and redistribute
10 * it freely, subject to the following restrictions:
11 *
12 * 1. The origin of this software must not be misrepresented; you must not
13 * claim that you wrote the original software. If you use this software
14 * in a product, an acknowledgment in the product documentation would be
15 * appreciated but is not required.
16 *
17 * 2. Altered source versions must be plainly marked as such, and must not be
18 * misrepresented as being the original software.
19 *
20 * 3. This notice may not be removed or altered from any source distribution.
21 */
22 /* Sccsid @(#)memalign.c 1.7 (gritter) 1/22/06 */
23
24 #if defined (__FreeBSD__) || defined (__dietlibc__) || defined (_AIX) || \
25 defined (__NetBSD__) || defined (__OpenBSD__) || \
26 defined (__DragonFly__) || defined (__APPLE__)
27 /*
28 * FreeBSD malloc(3) promises to page-align the return of malloc() calls
29 * if size is at least a page. This serves for a poor man's memalign()
30 * implementation that matches our needs.
31 */
32 #include <unistd.h>
33 #include <stdlib.h>
34
35 #include "memalign.h"
36
37 void *
memalign(size_t alignment,size_t size)38 memalign(size_t alignment, size_t size)
39 {
40 static long pagesize;
41
42 if (pagesize == 0)
43 pagesize = sysconf(_SC_PAGESIZE);
44 if (alignment != pagesize)
45 return NULL;
46 if (size < pagesize)
47 size = pagesize;
48 return malloc(size);
49 }
50 #endif /* __FreeBSD__ || __dietlibc__ || _AIX || __NetBSD__ || __OpenBSD__ ||
51 __DragonFly__ || __APPLE__ */
52