// TODO: Has close() race condition.
public unsafe override int Read(byte[] buffer, int offset, int count)
{
Throw.If.OutOfRange(buffer, offset, count);
UpdateSettings();
if (count == 0)
{
return(0);
}
fixed(byte *buffer0 = buffer)
{
int startTime = Environment.TickCount, readTimeout = ReadTimeout;
while (true)
{
int handle = _handle;
if (handle < 0)
{
throw new IOException("Closed.");
}
var bufferPtr = (IntPtr)(buffer0 + offset);
int bytesToRead = count;
var fd = new NativeMethods.pollfd()
{
fd = handle, events = NativeMethods.pollev.IN
};
int ret = NativeMethods.retry(() => NativeMethods.poll(ref fd, (IntPtr)1, GetTimeout(startTime, readTimeout)));
if (ret < 0)
{
throw new IOException("Read failed (poll).");
}
if (ret == 1)
{
if (fd.revents != NativeMethods.pollev.IN)
{
throw new IOException(string.Format("Closed during read ({0}).", fd.revents));
}
int readCount = checked ((int)NativeMethods.retry(() => NativeMethods.read(handle, bufferPtr, (UIntPtr)bytesToRead)));
if (readCount <= 0 || readCount > bytesToRead)
{
throw new IOException("Read failed.");
}
return(readCount);
}
}
}
}
// TODO: Has close() race condition.
public unsafe override void Write(byte[] buffer, int offset, int count)
{
Throw.If.OutOfRange(buffer, offset, count);
UpdateSettings();
if (count == 0)
{
return;
}
fixed(byte *buffer0 = buffer)
{
int startTime = Environment.TickCount, writeTimeout = WriteTimeout;
for (int bytesWritten = 0; bytesWritten < count;)
{
int handle = _handle;
if (handle < 0)
{
throw new IOException("Closed.");
}
var bufferPtr = (IntPtr)(buffer0 + offset + bytesWritten);
int bytesToWrite = count - bytesWritten;
var fd = new NativeMethods.pollfd()
{
fd = handle, events = NativeMethods.pollev.OUT
};
int ret = NativeMethods.retry(() => NativeMethods.poll(ref fd, (IntPtr)1, GetTimeout(startTime, writeTimeout)));
if (ret < 0)
{
throw new IOException("Write failed (poll).");
}
if (ret == 1)
{
if (fd.revents != NativeMethods.pollev.OUT)
{
throw new IOException(string.Format("Closed during write ({0}).", fd.revents));
}
int writeCount = checked ((int)NativeMethods.retry(() => NativeMethods.write(handle, bufferPtr, (UIntPtr)bytesToWrite)));
if (writeCount <= 0 || writeCount > bytesToWrite)
{
throw new IOException("Write failed.");
}
bytesWritten += writeCount;
}
}
}
}
unsafe void ReadThread()
{
if (!HandleAcquire())
{
return;
}
try
{
lock (_inputQueue)
{
var pfd = new NativeMethods.pollfd();
pfd.fd = _handle;
pfd.events = NativeMethods.pollev.IN;
while (!_shutdown)
{
tryReadAgain:
Monitor.Exit(_inputQueue);
int ret;
try { ret = NativeMethods.poll(ref pfd, (IntPtr)1, 250); }
finally { Monitor.Enter(_inputQueue); }
if (ret != 1)
{
continue;
}
if (0 != (pfd.revents & (NativeMethods.pollev.ERR | NativeMethods.pollev.HUP | NativeMethods.pollev.NVAL)))
{
break;
}
if (0 != (pfd.revents & NativeMethods.pollev.IN))
{
// Linux doesn't provide a Report ID if the device doesn't use one.
int inputLength = Device.GetMaxInputReportLength();
if (inputLength > 0 && !((LinuxHidDevice)Device).ReportsUseID)
{
inputLength--;
}
byte[] inputReport = new byte[inputLength];
fixed(byte *inputBytes = inputReport)
{
var inputBytesPtr = (IntPtr)inputBytes;
IntPtr length = NativeMethods.retry(() => NativeMethods.read
(_handle, inputBytesPtr, (UIntPtr)inputReport.Length));
if ((long)length < 0)
{
var error = (NativeMethods.error)Marshal.GetLastWin32Error();
if (error != NativeMethods.error.EAGAIN)
{
break;
}
goto tryReadAgain;
}
Array.Resize(ref inputReport, (int)length); // No Report ID? First byte becomes Report ID 0.
if (!((LinuxHidDevice)Device).ReportsUseID)
{
inputReport = new byte[1].Concat(inputReport).ToArray();
}
_inputQueue.Enqueue(inputReport); Monitor.PulseAll(_inputQueue);
}
}
}
CommonDisconnected(_inputQueue);
}
}
finally
{
HandleRelease();
}
}
protected override void Run(Action readyCallback)
{
IntPtr udev = NativeMethodsLibudev.Instance.udev_new();
RunAssert(udev != IntPtr.Zero, "HidSharp udev_new failed.");
try
{
IntPtr monitor = NativeMethodsLibudev.Instance.udev_monitor_new_from_netlink(udev, "udev");
RunAssert(monitor != IntPtr.Zero, "HidSharp udev_monitor_new_from_netlink failed.");
try
{
int ret;
ret = NativeMethodsLibudev.Instance.udev_monitor_filter_add_match_subsystem_devtype(monitor, "hid", null);
RunAssert(ret >= 0, "HidSharp udev_monitor_failed_add_match_subsystem_devtype failed.");
ret = NativeMethodsLibudev.Instance.udev_monitor_enable_receiving(monitor);
RunAssert(ret >= 0, "HidSharp udev_monitor_enable_receiving failed.");
int fd = NativeMethodsLibudev.Instance.udev_monitor_get_fd(monitor);
RunAssert(fd >= 0, "HidSharp udev_monitor_get_fd failed.");
var fds = new NativeMethods.pollfd[1];
fds[0].fd = fd;
fds[0].events = NativeMethods.pollev.IN;
readyCallback();
while (true)
{
ret = NativeMethods.retry(() => NativeMethods.poll(fds, (IntPtr)1, -1));
if (ret < 0)
{
break;
}
if (ret == 1)
{
if (0 != (fds[0].revents & (NativeMethods.pollev.ERR | NativeMethods.pollev.HUP | NativeMethods.pollev.NVAL)))
{
break;
}
if (0 != (fds[0].revents & NativeMethods.pollev.IN))
{
IntPtr device = NativeMethodsLibudev.Instance.udev_monitor_receive_device(monitor);
if (device != null)
{
NativeMethodsLibudev.Instance.udev_device_unref(device);
DeviceList.Local.RaiseChanged();
}
}
}
}
}
finally
{
NativeMethodsLibudev.Instance.udev_monitor_unref(monitor);
}
}
finally
{
NativeMethodsLibudev.Instance.udev_unref(udev);
}
}