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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROMEOS_BINDER_DRIVER_H_
#define CHROMEOS_BINDER_DRIVER_H_
#include <stddef.h>
#include "base/files/scoped_file.h"
#include "base/macros.h"
#include "chromeos/chromeos_export.h"
namespace binder {
// Use this class to communicate with the binder driver provided by the kernel.
// This class is stateless and it's safe to access this class from multiple
// threads.
class CHROMEOS_EXPORT Driver {
public:
Driver();
~Driver();
// Opens the binder driver, performs necessary initialization, and returns
// true on success.
// This method must be called before calling any other method.
bool Initialize();
// Returns the file descriptor of the binder driver.
int GetFD();
// Sets the maximum number of additional service threads.
// By default the number is set to 0.
bool SetMaxThreads(int max_threads);
// Writes and reads data to/from the driver.
// The data in the buffer specified by write_buf and write_buf_size will be
// written, and the number of bytes written will be stored in
// num_written_bytes. The read data will be stored in the buffer specified by
// read_buf and read_buf_size, and the number of bytes read will be stored in
// num_read_bytes.
bool WriteRead(const char* write_buf,
size_t write_buf_size,
char* read_buf,
size_t read_buf_size,
size_t* num_written_bytes,
size_t* num_read_bytes);
// Waits for some data to be available for reading.
bool Poll();
// Lets the driver know the current thread is exiting.
bool NotifyCurrentThreadExiting();
private:
// Returns the size of the mmap region for transaction data.
size_t GetBinderMmapSize() const;
base::ScopedFD fd_;
void* mmap_address_;
DISALLOW_COPY_AND_ASSIGN(Driver);
};
} // namespace binder
#endif // CHROMEOS_BINDER_DRIVER_H_
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