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UnixCancellationPipe.cs
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UnixCancellationPipe.cs
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using Vezel.Cathode.Native;
namespace Vezel.Cathode.Terminals;
[SuppressMessage("", "CA1001")]
internal sealed class UnixCancellationPipe
{
// TODO: Move this logic to src/native/driver-unix.c.
private readonly AnonymousPipeServerStream _server;
private readonly AnonymousPipeClientStream _client;
private readonly bool _write;
public UnixCancellationPipe(bool write)
{
_server = new(PipeDirection.Out);
_client = new(PipeDirection.In, _server.ClientSafePipeHandle);
_write = write;
}
public unsafe void PollWithCancellation(int fd, CancellationToken cancellationToken)
{
// Note that the runtime sets up a SIGPIPE handler for us.
var unused = false;
var pipeHandle = _client.SafePipeHandle;
pipeHandle.DangerousAddRef(ref unused);
try
{
var handles = stackalloc[]
{
(int)pipeHandle.DangerousGetHandle(),
fd,
};
var results = stackalloc bool[2];
using (var registration = cancellationToken.UnsafeRegister(
static @this => Unsafe.As<UnixCancellationPipe>(@this!)._server.WriteByte(42), this))
TerminalInterop.Poll(_write, handles, results, count: 2);
// Were we canceled?
if (results[0])
{
// Read the dummy byte that was written to indicate cancellation.
_ = _client.ReadByte();
throw new OperationCanceledException(cancellationToken);
}
}
finally
{
pipeHandle.DangerousRelease();
}
}
}