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87 lines
2.4 KiB
87 lines
2.4 KiB
/* mremap.c -- version of mremap for gold. */ |
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/* Copyright (C) 2009-2014 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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