/* Memory allocation aligned to system page boundaries.
- Copyright (C) 2005, 2006 Free Software Foundation, Inc.
+ Copyright (C) 2005-2007, 2009-2013 Free Software Foundation, Inc.
- 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 2, or (at your option)
- any later version.
+ 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.
+ 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, write to the Free Software
- Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
- USA. */
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>. */
/* Written by Derek R. Price <derek@ximbiot.com>. */
#endif
#include "error.h"
-#include "exit.h"
-#include "getpagesize.h"
#include "xalloc.h"
#include "gettext.h"
# endif
#endif
+/* The results of open() in this file are not used with fchdir,
+ therefore save some unnecessary work in fchdir.c. */
+#undef open
+#undef close
+
#if HAVE_MMAP || ! HAVE_POSIX_MEMALIGN
static void
new_memnode (void *aligned_ptr, info_t info)
{
- memnode_t *new_node = (memnode_t *) xmalloc (sizeof (memnode_t));
+ memnode_t *new_node = XMALLOC (memnode_t);
new_node->aligned_ptr = aligned_ptr;
new_node->info = info;
new_node->next = memnode_table;
pagealign_alloc (size_t size)
{
void *ret;
+ /* We prefer the mmap() approach over the posix_memalign() or malloc()
+ based approaches, since the latter often waste an entire memory page
+ per call. */
#if HAVE_MMAP
# ifdef HAVE_MAP_ANONYMOUS
const int fd = -1;
const int flags = MAP_ANONYMOUS | MAP_PRIVATE;
# else /* !HAVE_MAP_ANONYMOUS */
static int fd = -1; /* Only open /dev/zero once in order to avoid limiting
- the amount of memory we may allocate based on the
- number of open file descriptors. */
+ the amount of memory we may allocate based on the
+ number of open file descriptors. */
const int flags = MAP_FILE | MAP_PRIVATE;
if (fd == -1)
{
fd = open ("/dev/zero", O_RDONLY, 0666);
if (fd < 0)
- error (EXIT_FAILURE, errno, _("Failed to open /dev/zero for read"));
+ error (EXIT_FAILURE, errno, _("Failed to open /dev/zero for read"));
}
# endif /* HAVE_MAP_ANONYMOUS */
ret = mmap (NULL, size, PROT_READ | PROT_WRITE, flags, fd, 0);
if (unaligned_ptr == NULL)
{
/* Set errno. We don't know whether malloc already set errno: some
- implementations of malloc do, some don't. */
+ implementations of malloc do, some don't. */
errno = ENOMEM;
return NULL;
}