#pragma once
/*
 * Copyright (C) 2016 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.
 */
struct private_handle_t;

/**
 * Map the memory associated with hnd->fd or, if already mapped, increment
 * its reference count.
 */
void* reference_region(
    const char* op, const private_handle_t* hnd);

/**
 * Decrement the reference count associated with hnd->fd, unmapping its
 * memory iff the reference count reaches 0.
 */
int unreference_region(const char* op, const private_handle_t* hnd);