media_driver/linux/common/os/magma_fd.h

/*
* Copyright (c) 2021, The Fuchsia Authors
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/

#ifndef MAGMA_FD_H
#define MAGMA_FD_H

#include <stdint.h>
#include <stdbool.h>

#ifdef __cplusplus
extern "C" {
#endif

// Fuchsia devices are 64bit handles, but this project only passes around 32bits
// because that's sufficient for file descriptors on Linux.
// Instead of changing the handle type everywhere, just map the Fuchsia device to
// a fake FD which can only be used with this API.
int get_magma_fd_for_device(uintptr_t device);

// Performs a query on the device associated with the given FD.
bool query_magma_fd(int fd, int32_t param, uint32_t* value_out);

// Returns the device associated with the FD, without transferring ownership.
uintptr_t get_device_for_magma_fd(int fd);

#ifdef __cplusplus
}
#endif

#endif