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The XWAYLAND Extension
Version 1.0
2022-07-29
1. Introduction
The XWAYLAND extension allows clients to reliably identify whether an X server
is Xwayland. It does not provide any functionality beyond the absolute minimum
to identify as extension.
Only Xwayland initializes this extension. Thus, if the extension is present,
the X server is Xwayland. Clients should not need the protocol detailed in this
document, a QueryExtension or ListExtensions request is sufficient to check
whether the extension is present.
The protocol detailed in this document is merely to future-proof this extension
in case actual functionality is added in the future.
❄ ❄ ❄ ❄ ❄ ❄ ❄
2. Version History
- 1.0, July 2022: QueryVersion request only
❄ ❄ ❄ ❄ ❄ ❄ ❄
3. Events and Errors
XWAYLAND defines no events or errrors
❄ ❄ ❄ ❄ ❄ ❄ ❄
4. Extension initialization
The name of this extension is "XWAYLAND"
┌───
XwlQueryVersion
client-major-version: CARD16
client-minor-version: CARD16
▶
major-version: CARD16
minor-version: CARD16
└───
The client sends the highest supported version to the server
and the server replies with the highest version it supports,
but no higher than the requested version. Major versions changes
can introduce incompatibilities in existing functionality, minor
version changes introduce only backward compatible changes.
It is the clients responsibility to ensure that the server
supports a version which is compatible with its expectations.
Backwards compatible changes include addition of new
requests.
❄ ❄ ❄ ❄ ❄ ❄ ❄
Appendix A. Protocol Encoding
Syntactic Conventions
This document uses the same syntactic conventions as the core X
protocol encoding document.
A.1 Common Types
None.
A.2 Protocol Requests
┌───
XwlQueryVersion
1 CARD8 major opcode
1 0 XWAYLAND opcode
2 2 length
2 CARD16 major version
2 CARD16 minor version
▶
1 1 Reply
1 unused
2 CARD16 sequence number
4 0 reply length
2 CARD16 major version
2 CARD16 minor version
20 unused
└───
A.3 Protocol Events
The XWAYLAND extension defines no events.
A.4 Protocol Errors
The XWAYLAND extension defines no errors.
❄ ❄ ❄ ❄ ❄ ❄ ❄
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