Imported binutils-2.20

[msp430-binutils.git] / gold / mremap.c

diff --git a/gold/mremap.c b/gold/mremap.c
new file mode 100644 (file)
index 0000000..332fded
--- /dev/null
+++ 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
+
+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;
+}