This uses a new hardware message with Wine internal WM_WINE_CLIPCURSOR message, to notify the foreground window of ClipCursor calls, or resets. It could possibly have used posted messages, like is done to request the desktop to release the clipping rectangle but I figured that a hardware message could be appropriate and is possibly the preferred mechanism to notify the foreground window.
We use QS_RAWINPUT for convenience here, as to automatically release the hardware message, and because this message is somewhat low-level. It could be anything, and maybe QS_MOUSEMOVE, but we'd have to then manually call accept_hardware_message from win32u.
The desktop posted message is kept, as there's no guarantee that the foreground window will be processing its hardware messages when we need, and/or that the desktop window is foreground.
--
https://gitlab.winehq.org/wine/wine/-/merge_requests/2981
Windows 10 [received support](https://devblogs.microsoft.com/commandline/af_unix-comes-to-window… for AF_UNIX sockets in Insider Build 17063. This merge request adds basic support for AF_UNIX sockets to ws2_32 and wineserver.
Of particular note is the difficulty in handling `sun_path`. Most of the functions that allow for translating Windows paths to Unix paths are not accessible from ws2_32. I considered the following options:
* Pass the Windows path to wineserver and do the conversion there.
* This is, as far as I can tell, not possible without major rearchitecting. wineserver does not have functions to translate Windows paths to Unix paths, for obvious reasons.
* Obtain the current working directory of the requesting process and temporarily change directories to there.
* This only handles relative paths and fails for absolute paths, UNC paths, etc.
* Conditionally change directories based on whether the path is relative or not.
* This is error-prone and wineserver does not have the requisite functions to do this cleanly.
I ultimately decided to pass the translated Unix path to wineserver, which changes directories to `dirname(path)`. It then provides `bind` and `connect` with `basename(path)`. This is not threadsafe, but wineserver is not (currently) multithreaded.
Abstract sockets are supported by this patch.
--
v14: ws2_32/tests: Add test for AF_UNIX sockets.
server + ntdll/unix: Move getpeername() implementation to server.
server: Introduce error when attempting to connect() to abstract AF_UNIX sockets.
server: Allow for deletion of socket files.
ws2_32: Add support for AF_UNIX sockets.
ntdll/unix: Add support for AF_UNIX sockets to multiple functions.
ws2_32: Add afunix.h header.
https://gitlab.winehq.org/wine/wine/-/merge_requests/2786