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Diffstat (limited to 'libs/utils/FileMap.cpp')
| -rw-r--r-- | libs/utils/FileMap.cpp | 222 |
1 files changed, 0 insertions, 222 deletions
diff --git a/libs/utils/FileMap.cpp b/libs/utils/FileMap.cpp deleted file mode 100644 index e1ba9b2..0000000 --- a/libs/utils/FileMap.cpp +++ /dev/null @@ -1,222 +0,0 @@ -/* - * Copyright (C) 2006 The Android Open Source Project - * - * Licensed under the Apache License, Version 2.0 (the "License"); - * you may not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -// -// Shared file mapping class. -// - -#define LOG_TAG "filemap" - -#include <utils/FileMap.h> -#include <utils/Log.h> - -#include <stdio.h> -#include <stdlib.h> - -#ifdef HAVE_POSIX_FILEMAP -#include <sys/mman.h> -#endif - -#include <string.h> -#include <memory.h> -#include <errno.h> -#include <assert.h> - -using namespace android; - -/*static*/ long FileMap::mPageSize = -1; - - -/* - * Constructor. Create an empty object. - */ -FileMap::FileMap(void) - : mRefCount(1), mFileName(NULL), mBasePtr(NULL), mBaseLength(0), - mDataPtr(NULL), mDataLength(0) -{ -} - -/* - * Destructor. - */ -FileMap::~FileMap(void) -{ - assert(mRefCount == 0); - - //printf("+++ removing FileMap %p %u\n", mDataPtr, mDataLength); - - mRefCount = -100; // help catch double-free - if (mFileName != NULL) { - free(mFileName); - } -#ifdef HAVE_POSIX_FILEMAP - if (munmap(mBasePtr, mBaseLength) != 0) { - LOGD("munmap(%p, %d) failed\n", mBasePtr, (int) mBaseLength); - } -#endif -#ifdef HAVE_WIN32_FILEMAP - if ( UnmapViewOfFile(mBasePtr) == 0) { - LOGD("UnmapViewOfFile(%p) failed, error = %ld\n", mBasePtr, - GetLastError() ); - } - CloseHandle(mFileMapping); - CloseHandle(mFileHandle); -#endif -} - - -/* - * Create a new mapping on an open file. - * - * Closing the file descriptor does not unmap the pages, so we don't - * claim ownership of the fd. - * - * Returns "false" on failure. - */ -bool FileMap::create(const char* origFileName, int fd, off_t offset, size_t length, bool readOnly) -{ -#ifdef HAVE_WIN32_FILEMAP - int adjust; - off_t adjOffset; - size_t adjLength; - - if (mPageSize == -1) { - SYSTEM_INFO si; - - GetSystemInfo( &si ); - mPageSize = si.dwAllocationGranularity; - } - - DWORD protect = readOnly ? PAGE_READONLY : PAGE_READWRITE; - - mFileHandle = (HANDLE) _get_osfhandle(fd); - mFileMapping = CreateFileMapping( mFileHandle, NULL, protect, 0, 0, NULL); - if (mFileMapping == NULL) { - LOGE("CreateFileMapping(%p, %lx) failed with error %ld\n", - mFileHandle, protect, GetLastError() ); - return false; - } - - adjust = offset % mPageSize; - adjOffset = offset - adjust; - adjLength = length + adjust; - - mBasePtr = MapViewOfFile( mFileMapping, - readOnly ? FILE_MAP_READ : FILE_MAP_ALL_ACCESS, - 0, - (DWORD)(adjOffset), - adjLength ); - if (mBasePtr == NULL) { - LOGE("MapViewOfFile(%ld, %ld) failed with error %ld\n", - adjOffset, adjLength, GetLastError() ); - CloseHandle(mFileMapping); - mFileMapping = INVALID_HANDLE_VALUE; - return false; - } -#endif -#ifdef HAVE_POSIX_FILEMAP - int prot, flags, adjust; - off_t adjOffset; - size_t adjLength; - - void* ptr; - - assert(mRefCount == 1); - assert(fd >= 0); - assert(offset >= 0); - assert(length > 0); - - /* init on first use */ - if (mPageSize == -1) { -#if NOT_USING_KLIBC - mPageSize = sysconf(_SC_PAGESIZE); - if (mPageSize == -1) { - LOGE("could not get _SC_PAGESIZE\n"); - return false; - } -#else - /* this holds for Linux, Darwin, Cygwin, and doesn't pain the ARM */ - mPageSize = 4096; -#endif - } - - adjust = offset % mPageSize; -try_again: - adjOffset = offset - adjust; - adjLength = length + adjust; - - flags = MAP_SHARED; - prot = PROT_READ; - if (!readOnly) - prot |= PROT_WRITE; - - ptr = mmap(NULL, adjLength, prot, flags, fd, adjOffset); - if (ptr == MAP_FAILED) { - // Cygwin does not seem to like file mapping files from an offset. - // So if we fail, try again with offset zero - if (adjOffset > 0) { - adjust = offset; - goto try_again; - } - - LOGE("mmap(%ld,%ld) failed: %s\n", - (long) adjOffset, (long) adjLength, strerror(errno)); - return false; - } - mBasePtr = ptr; -#endif /* HAVE_POSIX_FILEMAP */ - - mFileName = origFileName != NULL ? strdup(origFileName) : NULL; - mBaseLength = adjLength; - mDataOffset = offset; - mDataPtr = (char*) mBasePtr + adjust; - mDataLength = length; - - assert(mBasePtr != NULL); - - LOGV("MAP: base %p/%d data %p/%d\n", - mBasePtr, (int) mBaseLength, mDataPtr, (int) mDataLength); - - return true; -} - -/* - * Provide guidance to the system. - */ -int FileMap::advise(MapAdvice advice) -{ -#if HAVE_MADVISE - int cc, sysAdvice; - - switch (advice) { - case NORMAL: sysAdvice = MADV_NORMAL; break; - case RANDOM: sysAdvice = MADV_RANDOM; break; - case SEQUENTIAL: sysAdvice = MADV_SEQUENTIAL; break; - case WILLNEED: sysAdvice = MADV_WILLNEED; break; - case DONTNEED: sysAdvice = MADV_DONTNEED; break; - default: - assert(false); - return -1; - } - - cc = madvise(mBasePtr, mBaseLength, sysAdvice); - if (cc != 0) - LOGW("madvise(%d) failed: %s\n", sysAdvice, strerror(errno)); - return cc; -#else - return -1; -#endif // HAVE_MADVISE -} |