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using Microsoft.Win32.SafeHandles;
using Ryujinx.Common.Logging;
using System;
using System.IO;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Threading;
using System.Threading.Tasks;
namespace Ryujinx.Common.SystemInterop
{
public partial class StdErrAdapter : IDisposable
{
private bool _disposable;
private Stream _pipeReader;
private Stream _pipeWriter;
private CancellationTokenSource _cancellationTokenSource;
private Task _worker;
public StdErrAdapter()
{
if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
{
RegisterPosix();
}
}
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
private void RegisterPosix()
{
const int StdErrFileno = 2;
(int readFd, int writeFd) = MakePipe();
dup2(writeFd, StdErrFileno);
_pipeReader = CreateFileDescriptorStream(readFd);
_pipeWriter = CreateFileDescriptorStream(writeFd);
_cancellationTokenSource = new CancellationTokenSource();
_worker = Task.Run(async () => await EventWorkerAsync(_cancellationTokenSource.Token), _cancellationTokenSource.Token);
_disposable = true;
}
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
private async Task EventWorkerAsync(CancellationToken cancellationToken)
{
using TextReader reader = new StreamReader(_pipeReader, leaveOpen: true);
string line;
while (cancellationToken.IsCancellationRequested == false && (line = await reader.ReadLineAsync(cancellationToken)) != null)
{
Logger.Error?.PrintRawMsg(line);
}
}
public void Dispose()
{
GC.SuppressFinalize(this);
if (_disposable)
{
_disposable = false;
if (OperatingSystem.IsLinux() || OperatingSystem.IsMacOS())
{
_cancellationTokenSource.Cancel();
_worker.Wait(0);
_pipeReader?.Close();
_pipeWriter?.Close();
}
}
}
[LibraryImport("libc", SetLastError = true)]
private static partial int dup2(int fd, int fd2);
[LibraryImport("libc", SetLastError = true)]
private static partial int pipe(Span<int> pipefd);
private static (int, int) MakePipe()
{
Span<int> pipefd = stackalloc int[2];
if (pipe(pipefd) == 0)
{
return (pipefd[0], pipefd[1]);
}
throw new();
}
[SupportedOSPlatform("linux")]
[SupportedOSPlatform("macos")]
private static Stream CreateFileDescriptorStream(int fd)
{
return new FileStream(
new SafeFileHandle(fd, ownsHandle: true),
FileAccess.ReadWrite
);
}
}
}
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