1 /* mremap.c -- version of mremap for gold. */ 2 3 /* Copyright (C) 2009-2016 Free Software Foundation, Inc. 4 Written by Ian Lance Taylor <iant (at) google.com>. 5 6 This file is part of gold. 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program; if not, write to the Free Software 20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, 21 MA 02110-1301, USA. */ 22 23 #include "config.h" 24 #include "ansidecl.h" 25 26 #include <errno.h> 27 #include <string.h> 28 #include <sys/types.h> 29 30 #ifdef HAVE_SYS_MMAN_H 31 #include <sys/mman.h> 32 #endif 33 34 extern void *gold_mremap (void *, size_t, size_t, int); 35 36 #ifdef HAVE_MMAP 37 38 /* This file implements mremap for systems which don't have it. The 39 gold code requires support for mmap. However, there are systems 40 which have mmap but not mremap. This is not a general replacement 41 for mremap; it only supports the features which are required for 42 gold. In particular, we assume that the MREMAP_MAYMOVE flag is 43 set. */ 44 45 /* Some BSD systems still use MAP_ANON instead of MAP_ANONYMOUS. */ 46 47 #ifndef MAP_ANONYMOUS 48 # define MAP_ANONYMOUS MAP_ANON 49 #endif 50 51 void * 52 gold_mremap (void *old_address, size_t old_size, size_t new_size, 53 int flags ATTRIBUTE_UNUSED) 54 { 55 void *ret; 56 57 ret = mmap (0, new_size, PROT_READ | PROT_WRITE, 58 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); 59 if (ret == MAP_FAILED) 60 return ret; 61 memcpy (ret, old_address, 62 old_size < new_size ? old_size : new_size); 63 (void) munmap (old_address, old_size); 64 return ret; 65 } 66 67 #else /* !defined(HAVE_MMAP) */ 68 69 #ifndef MAP_FAILED 70 #define MAP_FAILED ((void *) -1) 71 #endif 72 73 #ifndef ENOSYS 74 #define ENOSYS EINVAL 75 #endif 76 77 void * 78 gold_mremap (void *old_address ATTRIBUTE_UNUSED, 79 size_t old_size ATTRIBUTE_UNUSED, 80 size_t new_size ATTRIBUTE_UNUSED, 81 int flags ATTRIBUTE_UNUSED) 82 { 83 errno = ENOSYS; 84 return MAP_FAILED; 85 } 86 87 #endif /* !defined(HAVE_MMAP) */ 88
