1 /* 2 * Copyright 2008 Extreme Engineering Solutions, Inc. 3 * 4 * mmap/munmap implementation derived from: 5 * Clamav Native Windows Port : mmap win32 compatibility layer 6 * Copyright (c) 2005-2006 Gianluigi Tiesi <sherpya@netfarm.it> 7 * Parts by Kees Zeelenberg <kzlg@users.sourceforge.net> (LibGW32C) 8 * 9 * This program is free software; you can redistribute it and/or 10 * modify it under the terms of the GNU Library General Public 11 * License as published by the Free Software Foundation; either 12 * version 2 of the License, or (at your option) any later version. 13 * 14 * This library is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 17 * Library General Public License for more details. 18 * 19 * You should have received a copy of the GNU Library General Public 20 * License along with this software; if not, write to the 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 22 */ 23 24 #include "mingw_support.h" 25 #include <stdio.h> 26 #include <stdint.h> 27 #include <errno.h> 28 #include <io.h> 29 30 int fsync(int fd) 31 { 32 return _commit(fd); 33 } 34 35 void *mmap(void *addr, size_t len, int prot, int flags, int fd, int offset) 36 { 37 void *map = NULL; 38 HANDLE handle = INVALID_HANDLE_VALUE; 39 DWORD cfm_flags = 0, mvf_flags = 0; 40 41 switch (prot) { 42 case PROT_READ | PROT_WRITE: 43 cfm_flags = PAGE_READWRITE; 44 mvf_flags = FILE_MAP_ALL_ACCESS; 45 break; 46 case PROT_WRITE: 47 cfm_flags = PAGE_READWRITE; 48 mvf_flags = FILE_MAP_WRITE; 49 break; 50 case PROT_READ: 51 cfm_flags = PAGE_READONLY; 52 mvf_flags = FILE_MAP_READ; 53 break; 54 default: 55 return MAP_FAILED; 56 } 57 58 handle = CreateFileMappingA((HANDLE) _get_osfhandle(fd), NULL, 59 cfm_flags, HIDWORD(len), LODWORD(len), NULL); 60 if (!handle) 61 return MAP_FAILED; 62 63 map = MapViewOfFile(handle, mvf_flags, HIDWORD(offset), 64 LODWORD(offset), len); 65 CloseHandle(handle); 66 67 if (!map) 68 return MAP_FAILED; 69 70 return map; 71 } 72 73 int munmap(void *addr, size_t len) 74 { 75 if (!UnmapViewOfFile(addr)) 76 return -1; 77 78 return 0; 79 } 80