1/* mremap.c -- version of mremap for gold. */ 2 3/* Copyright 2009 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor <iant@google.com>. 5 6 This file is part of gold. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23#include "config.h" 24#include "ansidecl.h" 25 26#include <string.h> 27#include <sys/types.h> 28#include <sys/mman.h> 29 30/* This file implements mremap for systems which don't have it. The 31 gold code requires support for mmap. However, there are systems 32 which have mmap but not mremap. This is not a general replacement 33 for mremap; it only supports the features which are required for 34 gold. In particular, we assume that the MREMAP_MAYMOVE flag is 35 set. */ 36 37/* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS. */ 38 39#ifndef MAP_ANONYMOUS 40# define MAP_ANONYMOUS MAP_ANON 41#endif 42 43extern void *mremap (void *, size_t, size_t, int, ...); 44 45void * 46mremap (void *old_address, size_t old_size, size_t new_size, 47 int flags ATTRIBUTE_UNUSED, ...) 48{ 49 void *ret; 50 51 ret = mmap (0, new_size, PROT_READ | PROT_WRITE, 52 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 53 if (ret == MAP_FAILED) 54 return ret; 55 memcpy (ret, old_address, 56 old_size < new_size ? old_size : new_size); 57 (void) munmap (old_address, old_size); 58 return ret; 59} 60