libc/stdlib/posix_memalign.c

   1 /* posix_memalign for uClibc
   2  *
   3  * Copyright (C) 1996-2002, 2003, 2004, 2005 Free Software Foundation, Inc.
   4  * Copyright (C) 2005 by Erik Andersen <andersen@uclibc.org>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU Library General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or (at your
   9  * option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Library General Public License
  14  * for more details.
  15  *
  16  * You should have received a copy of the GNU Library General Public License
  17  * along with this program; see the file COPYING.LIB.  If not, see
  18  * <http://www.gnu.org/licenses/>.
  19  */
  20
  21 #include <stdlib.h>
  22 #include <malloc.h>
  23 #include <sys/types.h>
  24 #include <errno.h>
  25 #include <sys/param.h>
  26
  27 int posix_memalign(void **memptr, size_t alignment, size_t size)
  28 {
  29         /* Make sure alignment is correct. */
  30         if (alignment % sizeof(void *) != 0)
  31             /* Skip these checks because the memalign() func does them for us
  32              || !powerof2(alignment / sizeof(void *)) != 0
  33              || alignment == 0
  34              */
  35                 return EINVAL;
  36         void *mem = memalign(alignment, size);
  37         if (mem != NULL) {
  38                 *memptr = mem;
  39                 return 0;
  40         } else
  41                 return ENOMEM;
  42 }