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/* Memory segment handling.
Copyright (C) 2006 Tristan Gingold.
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 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 <gnu.org/licenses>.
*/
#ifndef WINNT
#define _GNU_SOURCE
#include <sys/mman.h>
#include <stddef.h>
/* #include <stdio.h> */
/* TODO: init (get pagesize)
round size,
set rights.
*/
#ifdef __APPLE__
#define MAP_ANONYMOUS MAP_ANON
#else
#define HAVE_MREMAP
#endif
#ifndef HAVE_MREMAP
#include <string.h>
#endif
void *
mmap_malloc (int size)
{
void *res;
res = mmap (NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
/* printf ("mmap (%d) = %p\n", size, res); */
if (res == MAP_FAILED)
return NULL;
return res;
}
void *
mmap_realloc (void *ptr, int old_size, int size)
{
void *res;
#ifdef HAVE_MREMAP
res = mremap (ptr, old_size, size, MREMAP_MAYMOVE);
#else
res = mmap (NULL, size, PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (res == MAP_FAILED)
return NULL;
memcpy (res, ptr, old_size);
munmap (ptr, old_size);
#endif
/* printf ("mremap (%p, %d, %d) = %p\n", ptr, old_size, size, res); */
#if 0
if (res == MAP_FAILED)
return NULL;
#endif
return res;
}
void
mmap_free (void * ptr, int size)
{
munmap (ptr, size);
}
void
mmap_rx (void *ptr, int size)
{
mprotect (ptr, size, PROT_READ | PROT_EXEC);
}
#else
#include <windows.h>
void *
mmap_malloc (int size)
{
void *res;
res = VirtualAlloc (NULL, size,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE);
return res;
}
void *
mmap_realloc (void *ptr, int old_size, int size)
{
void *res;
res = VirtualAlloc (NULL, size,
MEM_COMMIT | MEM_RESERVE,
PAGE_READWRITE);
if (ptr != NULL)
{
CopyMemory (res, ptr, size > old_size ? old_size : size);
VirtualFree (ptr, old_size, MEM_RELEASE);
}
return res;
}
void
mmap_free (void * ptr, int size)
{
VirtualFree (ptr, size, MEM_RELEASE);
}
void
mmap_rx (void *ptr, int size)
{
DWORD old;
/* This is not supported on every version.
In case of failure, this should still work. */
VirtualProtect (ptr, size, PAGE_EXECUTE_READ, &old);
}
#endif
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