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107 lines
3.3 KiB
107 lines
3.3 KiB
5 months ago
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/* Copyright (c) 2000, 2019, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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Without limiting anything contained in the foregoing, this file,
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which is part of C Driver for MySQL (Connector/C), is also subject to the
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Universal FOSS Exception, version 1.0, a copy of which can be found at
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http://oss.oracle.com/licenses/universal-foss-exception.
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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, version 2.0, 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file mysys/my_mmap.cc
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*/
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#include "my_config.h"
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#include <stddef.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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#include "my_config.h"
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#include "my_dbug.h"
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#include "my_inttypes.h"
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#include "my_sys.h"
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#ifdef HAVE_SYS_MMAN_H
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/*
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system msync() only syncs mmap'ed area to fs cache.
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fsync() is required to really sync to disc
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*/
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int my_msync(int fd, void *addr, size_t len, int flags) {
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msync(static_cast<char *>(addr), len, flags);
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return my_sync(fd, MYF(0));
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}
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#elif defined(_WIN32)
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static SECURITY_ATTRIBUTES mmap_security_attributes = {
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sizeof(SECURITY_ATTRIBUTES), 0, TRUE};
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void *my_mmap(void *addr, size_t len, int prot, int flags, File fd,
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my_off_t offset) {
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HANDLE hFileMap;
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LPVOID ptr;
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HANDLE hFile = (HANDLE)my_get_osfhandle(fd);
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DBUG_TRACE;
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DBUG_PRINT("mysys", ("map fd: %d", fd));
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if (hFile == INVALID_HANDLE_VALUE) return MAP_FAILED;
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hFileMap = CreateFileMapping(hFile, &mmap_security_attributes, PAGE_READWRITE,
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0, (DWORD)len, NULL);
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if (hFileMap == 0) return MAP_FAILED;
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ptr = MapViewOfFile(hFileMap,
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prot & PROT_WRITE ? FILE_MAP_WRITE : FILE_MAP_READ,
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(DWORD)(offset >> 32), (DWORD)offset, len);
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/*
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MSDN explicitly states that it's possible to close File Mapping Object
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even when a view is not unmapped - then the object will be held open
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implicitly until unmap, as every view stores internally a handler of
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a corresponding File Mapping Object
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*/
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CloseHandle(hFileMap);
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if (ptr) {
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DBUG_PRINT("mysys", ("mapped addr: %p", ptr));
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return ptr;
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}
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return MAP_FAILED;
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}
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int my_munmap(void *addr, size_t len) {
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DBUG_TRACE;
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DBUG_PRINT("mysys", ("unmap addr: %p", addr));
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return UnmapViewOfFile(addr) ? 0 : -1;
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}
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int my_msync(int fd, void *addr, size_t len, int flags) {
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return FlushViewOfFile(addr, len) ? 0 : -1;
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}
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#else
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#error "no mmap!"
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#endif
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