public void TestAddMatchSubsystem()
{
using (var udev = new Context())
using (var e = new Enumerator(udev)) {
e.AddMatchSubsystem("mem");
e.ScanDevices();
Assert.Contains(e, d => d.DevNode == "/dev/null");
}
}
static IEnumerable <Serial.DeviceInfo> Find(Action <Enumerator> filter = null)
{
using (var udev = new Context())
using (var e = new Enumerator(udev)) {
e.AddMatchSubsystem("tty");
filter?.Invoke(e);
e.ScanDevices();
foreach (var d in e)
{
yield return(new DeviceInfo(d));
}
}
}
public IDisposable Connect()
{
if (monitor != null)
{
throw new InvalidOperationException("already connected");
}
monitor = new Monitor(udev);
monitor.AddMatchSubsystem("hidraw");
monitor.EnableReceiving();
var tokenSource = new CancellationTokenSource();
var token = tokenSource.Token;
Task.Run(() => {
try {
var enumerator = new Enumerator(udev);
enumerator.AddMatchSubsystem("hidraw");
enumerator.ScanDevices();
foreach (var device in enumerator)
{
if (token.IsCancellationRequested)
{
break;
}
var hids = TryGetHidDevices(device);
if (hids == null)
{
continue;
}
foreach (var hid in hids)
{
subject.OnNext(hid);
}
}
var pollfds = new Pollfd[] {
new Pollfd {
fd = monitor.Fd, events = PollEvents.POLLIN
}
};
while (!token.IsCancellationRequested)
{
// FIXME: it would be nice if we didn't wake up every 100ms
// not sure how to interrupt a system call though
// pinvoke pthread_kill() maybe?
var ret = Syscall.poll(pollfds, 100);
if (ret == -1)
{
var err = Stdlib.GetLastError();
if (err == Errno.EINTR)
{
continue;
}
UnixMarshal.ThrowExceptionForError(err);
}
if (token.IsCancellationRequested)
{
break;
}
if (ret == 0)
{
// timed out
continue;
}
if (pollfds[0].revents.HasFlag(PollEvents.POLLNVAL))
{
// monitor file descriptor is closed, monitor must
// have been disposed, so complete gracefully
break;
}
var device = monitor.TryReceiveDevice();
var hids = TryGetHidDevices(device);
if (hids == null)
{
continue;
}
foreach (var hid in hids)
{
subject.OnNext(hid);
}
}
subject.OnCompleted();
}
catch (Exception ex) {
subject.OnError(ex);
}
finally {
monitor.Dispose();
monitor = null;
}
}, token);
return(Disposable.Create(() => tokenSource.Cancel()));
}