// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.

using System;
using System.Runtime.InteropServices;

internal static partial class Interop
{
    internal static partial class Sys
    {
        [Flags]
        internal enum PipeFlags
        {
            O_CLOEXEC = 0x0010,
            O_NONBLOCK_READ = 0x0400,
            O_NONBLOCK_WRITE = 0x0800,
        }

        /// <summary>
        /// The index into the array filled by <see cref="Pipe"/> which represents the read end of the pipe.
        /// </summary>
        internal const int ReadEndOfPipe = 0;

        /// <summary>
        /// The index into the array filled by <see cref="Pipe"/> which represents the read end of the pipe.
        /// </summary>
        internal const int WriteEndOfPipe = 1;

        [LibraryImport(Libraries.SystemNative, EntryPoint = "SystemNative_Pipe", SetLastError = true)]
        internal static unsafe partial int Pipe(int* pipefd, PipeFlags flags = 0); // pipefd is an array of two ints
    }
}