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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="weston_debug">
<copyright>
Copyright © 2017 Pekka Paalanen pq@iki.fi
Copyright © 2018 Zodiac Inflight Innovations
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</copyright>
<interface name="weston_debug_v1" version="1">
<description summary="weston internal debugging">
This is a generic debugging interface for Weston internals, the global
object advertized through wl_registry.
WARNING: This interface by design allows a denial-of-service attack. It
should not be offered in production, or proper authorization mechanisms
must be enforced.
The idea is for a client to provide a file descriptor that the server
uses for printing debug information. The server uses the file
descriptor in blocking writes mode, which exposes the denial-of-service
risk. The blocking mode is necessary to ensure all debug messages can
be easily printed in place. It also ensures message ordering if a
client subscribes to more than one debug stream.
The available debugging features depend on the server.
A debug stream can be one-shot where the server prints the requested
information and then closes it, or continuous where server keeps on
printing until the client stops it. Or anything in between.
</description>
<request name="destroy" type="destructor">
<description summary="destroy factory object">
Destroys the factory object, but does not affect any other objects.
</description>
</request>
<event name="available">
<description summary="advertise available debug scope">
Advertises an available debug scope which the client may be able to
bind to. No information is provided by the server about the content
contained within the debug streams provided by the scope, once a
client has subscribed.
</description>
<arg name="name" type="string" allow-null="false"
summary="debug stream name"/>
<arg name="description" type="string" allow-null="true"
summary="human-readable description of the debug scope"/>
</event>
<request name="subscribe">
<description summary="subscribe to a debug stream">
Subscribe to a named debug stream. The server will start printing
to the given file descriptor.
If the named debug stream is a one-shot dump, the server will send
weston_debug_stream_v1.complete event once all requested data has
been printed. Otherwise, the server will continue streaming debug
prints until the subscription object is destroyed.
If the debug stream name is unknown to the server, the server will
immediately respond with weston_debug_stream_v1.failure event.
</description>
<arg name="name" type="string" allow-null="false"
summary="debug stream name"/>
<arg name="streamfd" type="fd" summary="write stream file descriptor"/>
<arg name="stream" type="new_id" interface="weston_debug_stream_v1"
summary="created debug stream object"/>
</request>
</interface>
<interface name="weston_debug_stream_v1" version="1">
<description summary="A subscribed debug stream">
Represents one subscribed debug stream, created with
weston_debug_v1.subscribe. When the object is created, it is associated
with a given file descriptor. The server will continue writing to the
file descriptor until the object is destroyed or the server sends an
event through the object.
</description>
<request name="destroy" type="destructor">
<description summary="close a debug stream">
Destroys the object, which causes the server to stop writing into
and closes the associated file descriptor if it was not closed
already.
Use a wl_display.sync if the clients needs to guarantee the file
descriptor is closed before continuing.
</description>
</request>
<event name="complete">
<description summary="server completed the debug stream">
The server has successfully finished writing to and has closed the
associated file descriptor.
This event is delivered only for one-shot debug streams where the
server dumps some data and stop. This is never delivered for
continuous debbug streams because they by definition never complete.
</description>
</event>
<event name="failure">
<description summary="server cannot continue the debug stream">
The server has stopped writing to and has closed the
associated file descriptor. The data already written to the file
descriptor is correct, but it may be truncated.
This event may be delivered at any time and for any kind of debug
stream. It may be due to a failure in or shutdown of the server.
The message argument may provide a hint of the reason.
</description>
<arg name="message" type="string" allow-null="true"
summary="human readable reason"/>
</event>
</interface>
</protocol>
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