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/*
* Copyright (C) 2008 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.
*/
#define LOG_TAG "MemoryHeapBase"
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <cutils/log.h>
#include <cutils/ashmem.h>
#include <cutils/atomic.h>
#include <binder/MemoryHeapBase.h>
namespace android {
// ---------------------------------------------------------------------------
MemoryHeapBase::MemoryHeapBase()
: mFD(-1), mSize(0), mBase(MAP_FAILED),
mDevice(NULL), mNeedUnmap(false), mOffset(0)
{
}
MemoryHeapBase::MemoryHeapBase(size_t size, uint32_t flags, char const * name)
: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
mDevice(0), mNeedUnmap(false), mOffset(0)
{
const size_t pagesize = getpagesize();
size = ((size + pagesize-1) & ~(pagesize-1));
int fd = ashmem_create_region(name == NULL ? "MemoryHeapBase" : name, size);
ALOGE_IF(fd<0, "error creating ashmem region: %s", strerror(errno));
if (fd >= 0) {
if (mapfd(fd, size) == NO_ERROR) {
if (flags & READ_ONLY) {
ashmem_set_prot_region(fd, PROT_READ);
}
}
}
}
MemoryHeapBase::MemoryHeapBase(const char* device, size_t size, uint32_t flags)
: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
mDevice(0), mNeedUnmap(false), mOffset(0)
{
int open_flags = O_RDWR;
if (flags & NO_CACHING)
open_flags |= O_SYNC;
int fd = open(device, open_flags);
ALOGE_IF(fd<0, "error opening %s: %s", device, strerror(errno));
if (fd >= 0) {
const size_t pagesize = getpagesize();
size = ((size + pagesize-1) & ~(pagesize-1));
if (mapfd(fd, size) == NO_ERROR) {
mDevice = device;
}
}
}
MemoryHeapBase::MemoryHeapBase(int fd, size_t size, uint32_t flags, uint32_t offset)
: mFD(-1), mSize(0), mBase(MAP_FAILED), mFlags(flags),
mDevice(0), mNeedUnmap(false), mOffset(0)
{
const size_t pagesize = getpagesize();
size = ((size + pagesize-1) & ~(pagesize-1));
mapfd(dup(fd), size, offset);
}
status_t MemoryHeapBase::init(int fd, void *base, int size, int flags, const char* device)
{
if (mFD != -1) {
return INVALID_OPERATION;
}
mFD = fd;
mBase = base;
mSize = size;
mFlags = flags;
mDevice = device;
return NO_ERROR;
}
status_t MemoryHeapBase::mapfd(int fd, size_t size, uint32_t offset)
{
if (size == 0) {
// try to figure out the size automatically
struct stat sb;
if (fstat(fd, &sb) == 0)
size = sb.st_size;
// if it didn't work, let mmap() fail.
}
if ((mFlags & DONT_MAP_LOCALLY) == 0) {
void* base = (uint8_t*)mmap(0, size,
PROT_READ|PROT_WRITE, MAP_SHARED, fd, offset);
if (base == MAP_FAILED) {
ALOGE("mmap(fd=%d, size=%u) failed (%s)",
fd, uint32_t(size), strerror(errno));
close(fd);
return -errno;
}
//ALOGD("mmap(fd=%d, base=%p, size=%lu)", fd, base, size);
mBase = base;
mNeedUnmap = true;
} else {
mBase = 0; // not MAP_FAILED
mNeedUnmap = false;
}
mFD = fd;
mSize = size;
mOffset = offset;
return NO_ERROR;
}
MemoryHeapBase::~MemoryHeapBase()
{
dispose();
}
void MemoryHeapBase::dispose()
{
int fd = android_atomic_or(-1, &mFD);
if (fd >= 0) {
if (mNeedUnmap) {
//ALOGD("munmap(fd=%d, base=%p, size=%lu)", fd, mBase, mSize);
munmap(mBase, mSize);
}
mBase = 0;
mSize = 0;
close(fd);
}
}
int MemoryHeapBase::getHeapID() const {
return mFD;
}
void* MemoryHeapBase::getBase() const {
return mBase;
}
size_t MemoryHeapBase::getSize() const {
return mSize;
}
uint32_t MemoryHeapBase::getFlags() const {
return mFlags;
}
const char* MemoryHeapBase::getDevice() const {
return mDevice;
}
uint32_t MemoryHeapBase::getOffset() const {
return mOffset;
}
// ---------------------------------------------------------------------------
}; // namespace android
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