mirror of
https://github.com/autc04/Retro68.git
synced 2024-08-17 04:29:51 +00:00
60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
|
/* mremap.c -- version of mremap for gold. */
|
||
|
|
||
|
/* Copyright 2009 Free Software Foundation, Inc.
|
||
|
Written by Ian Lance Taylor <iant@google.com>.
|
||
|
|
||
|
This file is part of gold.
|
||
|
|
||
|
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, write to the Free Software
|
||
|
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
|
||
|
MA 02110-1301, USA. */
|
||
|
|
||
|
#include "config.h"
|
||
|
#include "ansidecl.h"
|
||
|
|
||
|
#include <string.h>
|
||
|
#include <sys/types.h>
|
||
|
#include <sys/mman.h>
|
||
|
|
||
|
/* This file implements mremap for systems which don't have it. The
|
||
|
gold code requires support for mmap. However, there are systems
|
||
|
which have mmap but not mremap. This is not a general replacement
|
||
|
for mremap; it only supports the features which are required for
|
||
|
gold. In particular, we assume that the MREMAP_MAYMOVE flag is
|
||
|
set. */
|
||
|
|
||
|
/* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS. */
|
||
|
|
||
|
#ifndef MAP_ANONYMOUS
|
||
|
# define MAP_ANONYMOUS MAP_ANON
|
||
|
#endif
|
||
|
|
||
|
extern void *mremap (void *, size_t, size_t, int, ...);
|
||
|
|
||
|
void *
|
||
|
mremap (void *old_address, size_t old_size, size_t new_size,
|
||
|
int flags ATTRIBUTE_UNUSED, ...)
|
||
|
{
|
||
|
void *ret;
|
||
|
|
||
|
ret = mmap (0, new_size, PROT_READ | PROT_WRITE,
|
||
|
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
||
|
if (ret == MAP_FAILED)
|
||
|
return ret;
|
||
|
memcpy (ret, old_address,
|
||
|
old_size < new_size ? old_size : new_size);
|
||
|
(void) munmap (old_address, old_size);
|
||
|
return ret;
|
||
|
}
|