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/* 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;

}