third_party/fuchsia-sdk/arch/arm64/vdso/fifo.fidl

// 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.

// TODO(fxb/39732): This should be read as "library zx".
library zz;

[Transport = "Syscall"]
protocol fifo {
    /// Create a fifo.
    fifo_create(usize elem_count, usize elem_size, uint32 options)
        -> (status status, handle<fifo> out0, handle<fifo> out1);

    /// Read data from a fifo.
    /// Rights: handle must be of type ZX_OBJ_TYPE_FIFO and have ZX_RIGHT_READ.
    fifo_read(handle<fifo> handle, usize elem_size)
        -> (status status, vector_void data, optional_usize actual_count);

    /// Write data to a fifo.
    /// Rights: handle must be of type ZX_OBJ_TYPE_FIFO and have ZX_RIGHT_WRITE.
    fifo_write(handle<fifo> handle, usize elem_size, const_voidptr data, usize count)
        -> (status status, optional_usize actual_count);
};