1/* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#define LOG_TAG "MemoryHeapBase" 18 19#include <errno.h> 20#include <fcntl.h> 21#include <stdint.h> 22#include <stdlib.h> 23#include <sys/ioctl.h> 24#include <sys/stat.h> 25#include <sys/types.h> 26#include <unistd.h> 27 28#include <binder/MemoryHeapBase.h> 29#include <cutils/ashmem.h> 30#include <cutils/atomic.h> 31#include <log/log.h> 32 33namespace android { 34 35// --------------------------------------------------------------------------- 36 37MemoryHeapBase::MemoryHeapBase() 38 : mFD(-1), mSize(0), mBase(MAP_FAILED), 39 mDevice(NULL), mNeedUnmap(false), mOffset(0) 40{ 41} 42 43MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name) 44 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 45 mDevice(0), mNeedUnmap(false), mOffset(0) 46{ 47 const size_t pagesize = getpagesize(); 48 size = ((size + pagesize-1) & ~(pagesize-1)); 49 int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size); 50 ALOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno)); 51 if (fd >= 0) { 52 if (mapfd(fd, size) == NO_ERROR) { 53 if (flags & READ_ONLY) { 54 ashmem_set_prot_region(fd, PROT_READ); 55 } 56 } 57 } 58} 59 60MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags) 61 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 62 mDevice(0), mNeedUnmap(false), mOffset(0) 63{ 64 int open_flags = O_RDWR; 65 if (flags & NO_CACHING) 66 open_flags |= O_SYNC; 67 68 int fd = open(device, open_flags); 69 ALOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno)); 70 if (fd >= 0) { 71 const size_t pagesize = getpagesize(); 72 size = ((size + pagesize-1) & ~(pagesize-1)); 73 if (mapfd(fd, size) == NO_ERROR) { 74 mDevice = device; 75 } 76 } 77} 78 79MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset) 80 : mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags), 81 mDevice(0), mNeedUnmap(false), mOffset(0) 82{ 83 const size_t pagesize = getpagesize(); 84 size = ((size + pagesize-1) & ~(pagesize-1)); 85 mapfd(fcntl(fd, F_DUPFD_CLOEXEC, 0), size, offset); 86} 87 88status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device) 89{ 90 if (mFD != -1) { 91 return INVALID_OPERATION; 92 } 93 mFD = fd; 94 mBase = base; 95 mSize = size; 96 mFlags = flags; 97 mDevice = device; 98 return NO_ERROR; 99} 100 101status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset) 102{ 103 if (size == 0) { 104 // try to figure out the size automatically 105 struct stat sb; 106 if (fstat(fd, &sb) == 0) 107 size = sb.st_size; 108 // if it didn't work, let mmap() fail. 109 } 110 111 if ((mFlags & DONT_MAP_LOCALLY) == 0) { 112 void* base = (uint8_t*)mmap(0, size, 113 PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset); 114 if (base == MAP_FAILED) { 115 ALOGE("mmap(fd=%d, size=%u) failed (%s)", 116 fd, uint32_t(size), strerror(errno)); 117 close(fd); 118 return -errno; 119 } 120 //ALOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size); 121 mBase = base; 122 mNeedUnmap = true; 123 } else { 124 mBase = 0; // not MAP_FAILED 125 mNeedUnmap = false; 126 } 127 mFD = fd; 128 mSize = size; 129 mOffset = offset; 130 return NO_ERROR; 131} 132 133MemoryHeapBase::~MemoryHeapBase() 134{ 135 dispose(); 136} 137 138void MemoryHeapBase::dispose() 139{ 140 int fd = android_atomic_or(-1, &mFD); 141 if (fd >= 0) { 142 if (mNeedUnmap) { 143 //ALOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize); 144 munmap(mBase, mSize); 145 } 146 mBase = 0; 147 mSize = 0; 148 close(fd); 149 } 150} 151 152int MemoryHeapBase::getHeapID() const { 153 return mFD; 154} 155 156void* MemoryHeapBase::getBase() const { 157 return mBase; 158} 159 160size_t MemoryHeapBase::getSize() const { 161 return mSize; 162} 163 164uint32_t MemoryHeapBase::getFlags() const { 165 return mFlags; 166} 167 168const char* MemoryHeapBase::getDevice() const { 169 return mDevice; 170} 171 172uint32_t MemoryHeapBase::getOffset() const { 173 return mOffset; 174} 175 176// --------------------------------------------------------------------------- 177}; // namespace android 178