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authorIan Lance Taylor <ian@airs.com>2009-03-27 23:21:09 +0000
committerIan Lance Taylor <ian@airs.com>2009-03-27 23:21:09 +0000
commit2f35ab9b82f18c1ba7b27fb804859d6ed8482796 (patch)
tree1456d74d906200b979fa5b7c79861b1ae3cb6591 /gold/mremap.c
parent10e1b6bb907a5ec314012ebb75c94a8e5b29b145 (diff)
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* mremap.c: New file.
* configure.ac: Call AC_REPLACE_FUNCS on mremap. * gold.h (MREMAP_MAYMOVE): Define if HAVE_MREMAP is not defined. (mremap): Declare if HAVE_MREMAP is not defined. * configure, Makefile.in, config.in: Rebuild.
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diff --git a/gold/mremap.c b/gold/mremap.c
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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
+
+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;
+}