1 files changed, 31 insertions, 0 deletions
diff --git a/LibWinUsb/MonoLibUsb/CallbackDelegates.cs b/LibWinUsb/MonoLibUsb/CallbackDelegates.cs
new file mode 100644
index 0000000..10011fc
--- /dev/null
+++ b/LibWinUsb/MonoLibUsb/CallbackDelegates.cs
@@ -0,0 +1,31 @@
+using System;
+using System.Runtime.InteropServices;
+using MonoLibUsb.Transfer;
+
+namespace MonoLibUsb
+{
+    /// <summary>
+    /// Asynchronous transfer callback delegate
+    /// </summary>
+    /// <param name="transfer">The transfer previously allocated with <see cref="MonoUsbApi.AllocTransfer"/>.</param>
+    [UnmanagedFunctionPointer(MonoUsbApi.CC)]
+    public delegate void MonoUsbTransferDelegate(MonoUsbTransfer transfer);
+
+    /// <summary>
+    /// Callback delegate, invoked when a new file descriptor should be added to the set of file descriptors monitored for events. 
+    /// </summary>
+    /// <param name="fd">The new file descriptor.</param>
+    /// <param name="events">Events to monitor for, see PollfdItem for a description.</param>
+    /// <param name="user_data">User data pointer specified in <see cref="MonoUsbApi.SetPollfdNotifiers"/> call.</param>
+    [UnmanagedFunctionPointer(MonoUsbApi.CC)]
+    public delegate void PollfdAddedDelegate(int fd, short events, IntPtr user_data);
+
+    /// <summary>
+    /// Callback delegate, invoked when a file descriptor should be removed from the set of file descriptors being monitored for events.
+    /// </summary>
+    /// <remarks>After returning from this callback, do not use that file descriptor again. </remarks>
+    /// <param name="fd">The file descriptor to stop monitoring.</param>
+    /// <param name="user_data">User data pointer specified in <see cref="MonoUsbApi.SetPollfdNotifiers"/> call.</param>
+    [UnmanagedFunctionPointer(MonoUsbApi.CC)]
+    public delegate void PollfdRemovedDelegate(int fd, IntPtr user_data);
+}
+\ No newline at end of file