// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library zx;

// This file is copies of some syscalls that cover more unusual features (see
// annotations at the method).

using const_futexptr = int32;
using Futex = int32;
using mutable_uint32 = uint32;
using mutable_vector_void = vector<byte>;
using optional_signals = signals;
using vector_void_u32size = vector<byte>;
enum Clock : uint32 {
    MONOTONIC = 0;
    UTC = 1;
    THREAD = 2;
};


[Transport="Syscall"]
protocol Selection {
    // Special futex handling.
    FutexRequeue(const_futexptr value_ptr,
                 uint32 wake_count,
                 Futex current_value,
                 const_futexptr requeue_ptr,
                 uint32 requeue_count,
                 handle new_requeue_owner) ->
        (status status);

    // Optional output (signals).
    ObjectWaitOne(handle handle, signals signals, time deadline) ->
        (status status, optional_signals observed);

    // Argument reordering.
    [ArgReorder="handle,data,offset,data_size,actual"]
    KtraceRead(handle<resource> handle, mutable_vector_void data, uint32 offset) ->
        (status status, usize actual);

    // Mutable uint32 in the middle of input parameters (rather than as an
    // output).
    PciCfgPioRw(handle<resource> handle,
                uint8 bus,
                uint8 dev,
                uint8 func,
                uint8 offset,
                mutable_uint32 val,
                usize width,
                bool write) ->
        (status status);

    // uint32_t for size of a "vector".
    JobSetPolicy(handle<job> handle, uint32 options, uint32 topic, vector_void_u32size policy) ->
        (status status);

    // Handling of enums.
    ClockGet(Clock clock_id) -> (status status, time out);
};