/* mremap.c -- version of mremap for gold. */ /* Copyright (C) 2009-2022 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) */ |