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