Some questions about handling filenames in wineserver

[Richard W.M. Jones]

I'm trying to bring my old AF_UNIX patch up to date:

https://www.winehq.org/pipermail/wine-devel/2021-May/187049.html

It's not going too well as the code has changed quite a lot.

One particular problem I'm having is in wineserver.  We need to
convert the Windows socket path encoded as a UTF-8 string
(eg. Z:\tmp\sock) into a Unix filename.  In the old code I used:

+        num = MultiByteToWideChar(CP_UTF8, 0, wun->sun_path, -1, NULL, 0);
+        win_path = HeapAlloc(GetProcessHeap(), 0, num * sizeof(WCHAR));
+        if (win_path == NULL)
+            return 0;
+        MultiByteToWideChar(CP_UTF8, 0, wun->sun_path, -1, win_path, num);
+        unix_path = wine_get_unix_file_name(win_path);
+        heap_free(win_path);

However none of this seems to work inside wineserver (I guess because
it's not part of the "Windows world").  I cannot work out the
equivalent of this for wineserver, or if there's something else I
should be doing, such as converting the path before it is sent to
wineserver.

Supplemental question: There appears to be duplicate socket handling
code in wineserver server/sock.c and dlls/ntdll/unix/socket.c.  In my
tests only the wineserver code is called, and never the ntdll/unix
code.  Why is that?

(I'm not very familiar with the architecture of wine, which seems a
bit confusing, so I'm just guessing how it all works.)

Rich.