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Diffstat (limited to 'binutils-2.25/gold/mremap.c')
-rw-r--r-- | binutils-2.25/gold/mremap.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/binutils-2.25/gold/mremap.c b/binutils-2.25/gold/mremap.c new file mode 100644 index 0000000..e165634 --- /dev/null +++ b/binutils-2.25/gold/mremap.c @@ -0,0 +1,87 @@ +/* mremap.c -- version of mremap for gold. */ + +/* Copyright 2009, 2011 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 <errno.h> +#include <string.h> +#include <sys/types.h> + +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif + +extern void *gold_mremap (void *, size_t, size_t, int); + +#ifdef HAVE_MMAP + +/* 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 * +gold_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; +} + +#else /* !defined(HAVE_MMAP) */ + +#ifndef MAP_FAILED +#define MAP_FAILED ((void *) -1) +#endif + +#ifndef ENOSYS +#define ENOSYS EINVAL +#endif + +void * +gold_mremap (void *old_address ATTRIBUTE_UNUSED, + size_t old_size ATTRIBUTE_UNUSED, + size_t new_size ATTRIBUTE_UNUSED, + int flags ATTRIBUTE_UNUSED) +{ + errno = ENOSYS; + return MAP_FAILED; +} + +#endif /* !defined(HAVE_MMAP) */ |