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Tudor Brindus 7d52b4d0b5 xwayland/selection: ignore requests for anything but the newest data 
Our internal state machine gets screwed up if selection events are not
monotonically increasing in time, and we can enter a self-copy loop from
the proxy window that exhausts all pipes.

Snippet of logs when this occurs:

  00:00:46.238 [wlr] [xwayland/selection/incoming.c:487] XCB_XFIXES_SELECTION_NOTIFY (selection=277, owner=4194626)
  00:00:46.238 [wlr] [xwayland/selection/incoming.c:487] XCB_XFIXES_SELECTION_NOTIFY (selection=277, owner=2097153)
  00:00:46.238 [wlr] [xwayland/selection/outgoing.c:378] XCB_SELECTION_REQUEST (time=58979563 owner=2097153, requestor=2097153 selection=277, target=279, property=278)
  00:00:46.238 [wlr] [xwayland/selection/outgoing.c:397] ignoring old request from timestamp 58979563; expecting > 58979563
  00:00:46.238 [wlr] [xwayland/selection/outgoing.c:29] SendEvent destination=2097153 SelectionNotify(31) time=58979563 requestor=2097153 selection=277 target=279 property=0
  00:00:46.238 [wlr] [xwayland/selection/incoming.c:453] XCB_SELECTION_NOTIFY (selection=277, property=0, target=279)

Note that 2097153 is `selection->window`, and 4194626 is Emacs.

The race occurs if the selection owner changes back to our proxy window
between when we get `XCB_XFIXES_SELECTION_NOTIFY` for Emacs and when we
call `xcb_convert_selection` in `incoming.c:source_send` -- the
ConvertSelection request can end up hitting our proxy window, but the
timestamp will be rejected.

Fixes #2192.
2021-02-15 13:50:14 +01:00
.builds backend/x11: use native cursors 2021-02-05 11:45:54 +01:00
backend backend/x11: drop x11-xcb dependency 2021-02-08 12:29:12 +01:00
docs render/egl: fail to create wlr_egl on software renderer 2021-01-27 15:50:19 +01:00
examples examples: remove wlroots dep from client examples 2021-02-14 16:49:54 +01:00
include backend/x11: drop x11-xcb dependency 2021-02-08 12:29:12 +01:00
protocol layer-shell: allow new values for keyboard-interactivity 2021-01-12 20:13:52 +01:00
render render/gles2: remove YUV blocklist 2021-02-05 15:56:29 +01:00
tinywl tinywl: fix wlr_backend_autocreate call 2021-01-07 14:39:04 +01:00
types xdg-foreign: rename finish_* functions to destroy_* 2021-02-08 18:09:00 +01:00
util util: fix uuid support for freebsd 2021-01-08 20:51:51 +01:00
xcursor xcursor: make cursor data and metadata const 2021-02-05 10:04:20 +01:00
xwayland xwayland/selection: ignore requests for anything but the newest data 2021-02-15 13:50:14 +01:00
.editorconfig Set .editorconfig ident_size 2019-01-25 11:37:46 +01:00
.gitignore Remove rootston 2019-08-09 08:34:59 +09:00
CONTRIBUTING.md contributing: add note about events that destroy objects 2020-06-08 10:12:38 -06:00
LICENSE Update LICENSE year (MIT license) 2018-04-12 21:29:59 -04:00
meson.build build: remove extra whitespace 2021-02-08 14:57:41 +01:00
meson_options.txt types: add wlr_xdg_foreign_registry 2021-01-05 20:32:56 +01:00
README.md backend/x11: drop x11-xcb dependency 2021-02-08 12:29:12 +01:00
wlroots.syms util: add wlr_output_destroy_safe 2020-02-17 20:52:37 +01:00

README.md

wlroots

Pluggable, composable, unopinionated modules for building a Wayland compositor; or about 50,000 lines of code you were going to write anyway.

  • wlroots provides backends that abstract the underlying display and input hardware, including KMS/DRM, libinput, Wayland, X11, and headless backends, plus any custom backends you choose to write, which can all be created or destroyed at runtime and used in concert with each other.
  • wlroots provides unopinionated, mostly standalone implementations of many Wayland interfaces, both from wayland.xml and various protocol extensions. We also promote the standardization of portable extensions across many compositors.
  • wlroots provides several powerful, standalone, and optional tools that implement components common to many compositors, such as the arrangement of outputs in physical space.
  • wlroots provides an Xwayland abstraction that allows you to have excellent Xwayland support without worrying about writing your own X11 window manager on top of writing your compositor.
  • wlroots provides a renderer abstraction that simple compositors can use to avoid writing GL code directly, but which steps out of the way when your needs demand custom rendering code.

wlroots implements a huge variety of Wayland compositor features and implements them right, so you can focus on the features that make your compositor unique. By using wlroots, you get high performance, excellent hardware compatibility, broad support for many wayland interfaces, and comfortable development tools - or any subset of these features you like, because all of them work independently of one another and freely compose with anything you want to implement yourself.

Check out our wiki to get started with wlroots.

wlroots is developed under the direction of the sway project. A variety of wrapper libraries are available for using it with your favorite programming language.

Building

Install dependencies:

  • meson
  • wayland
  • wayland-protocols
  • EGL
  • GLESv2
  • libdrm
  • GBM
  • libinput
  • xkbcommon
  • udev
  • pixman
  • systemd (optional, for logind support)
  • elogind (optional, for logind support on systems without systemd)
  • libuuid (optional, for xdg-foreign support)

If you choose to enable X11 support:

  • xcb
  • xcb-composite
  • xcb-xfixes
  • xcb-xinput
  • xcb-image
  • xcb-render
  • xcb-errors (optional, for improved error reporting)
  • xcb-icccm (optional, for improved Xwayland introspection)

Run these commands:

meson build
ninja -C build

Install like so:

sudo ninja -C build install

Contributing

See CONTRIBUTING.md.