dwig@ingr.com (David Wiggins) (10/24/89)
While investigating the possibility of adding an extension event to X, I've found an inconsistency that I hope somebody can explain. It seems that the machinery to generate unique masks for extension events is already in place, but there's no way to tell clients what those generated masks are. Section 4.5 of the X11 Server Extensions Engineering Specification: "If multiple clients need to select on an event, an event mask must be assigned to the event number. Two routines are supplied by the server to facilitate getting and setting event masks." GetNextEventMask() and SetMaskForEvent(mask,event) are then described. However, on page 10, X11R3 Protocol: "Event codes 64 through 127 are reserved for extensions, although the core protocol does not define a mechanism for selecting interest in such events." What am I missing? David P. Wiggins uunet!ingr!b11!sr71!dwig
rws@EXPO.LCS.MIT.EDU (Bob Scheifler) (10/24/89)
It seems
that the machinery to generate unique masks for extension events is
already in place, but there's no way to tell clients what those
generated masks are.
What am I missing?
Nothing. Yes there is code in the sample server, but no there isn't
any general mechanism for exporting such events in the core protocol.
In general, extension definers have decided against trying to use
the same event mask as the core protocol (partly because there are
so few bits remaining), and just define their own selection mechanism
as part of the extension.