derek.holloway
7502bf64a4
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88 lines
2.4 KiB
C
88 lines
2.4 KiB
C
/* mremap.c -- version of mremap for gold. */
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/* Copyright (C) 2009-2024 Free Software Foundation, Inc.
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Written by Ian Lance Taylor <iant@google.com>.
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This file is part of gold.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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MA 02110-1301, USA. */
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#include "config.h"
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#include "ansidecl.h"
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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extern void *gold_mremap (void *, size_t, size_t, int);
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#ifdef HAVE_MMAP
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/* This file implements mremap for systems which don't have it. The
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gold code requires support for mmap. However, there are systems
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which have mmap but not mremap. This is not a general replacement
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for mremap; it only supports the features which are required for
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gold. In particular, we assume that the MREMAP_MAYMOVE flag is
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set. */
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/* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS. */
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#ifndef MAP_ANONYMOUS
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# define MAP_ANONYMOUS MAP_ANON
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#endif
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void *
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gold_mremap (void *old_address, size_t old_size, size_t new_size,
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int flags ATTRIBUTE_UNUSED)
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{
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void *ret;
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ret = mmap (0, new_size, PROT_READ | PROT_WRITE,
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MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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if (ret == MAP_FAILED)
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return ret;
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memcpy (ret, old_address,
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old_size < new_size ? old_size : new_size);
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(void) munmap (old_address, old_size);
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return ret;
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}
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#else /* !defined(HAVE_MMAP) */
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#ifndef MAP_FAILED
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#define MAP_FAILED ((void *) -1)
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#endif
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#ifndef ENOSYS
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#define ENOSYS EINVAL
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#endif
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void *
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gold_mremap (void *old_address ATTRIBUTE_UNUSED,
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size_t old_size ATTRIBUTE_UNUSED,
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size_t new_size ATTRIBUTE_UNUSED,
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int flags ATTRIBUTE_UNUSED)
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{
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errno = ENOSYS;
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return MAP_FAILED;
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}
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#endif /* !defined(HAVE_MMAP) */
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