.TH WESTON 1 "2019-03-23" "Weston @version@"
.SH NAME
weston \- the reference Wayland server
.SH SYNOPSIS
.B weston
.
.\" ***************************************************************
.SH DESCRIPTION
.B weston
is the reference implementation of a Wayland server. A Wayland server is a
display server, a window manager, and a compositor all in one. Weston has
several backends as loadable modules: it can run on Linux KMS (kernel
modesetting via DRM), as an X client, or inside another Wayland server
instance.

Weston supports fundamentally different graphical user interface paradigms via
shell plugins. Two plugins are provided: the desktop shell, and the tablet
shell.

When weston is started as the first windowing system (i.e. not under X nor
under another Wayland server), it should be done with the command
.B weston-launch
to set up proper privileged access to devices. If your system supports
the logind D-Bus API and the support has been built into weston as well,
it is possible to start weston with just
.BR weston .

Weston also supports X clients via
.BR XWayland ", see below."
.
.\" ***************************************************************
.SH BACKENDS
.TP
.I drm-backend.so
The DRM backend uses Linux KMS for output and evdev devices for input.
It supports multiple monitors in a unified desktop with DPMS. See
.BR weston-drm (7),
if installed.
.TP
.I wayland-backend.so
The Wayland backend runs on another Wayland server, a different Weston
instance, for example. Weston shows up as a single desktop window on
the parent server.
.TP
.I x11-backend.so
The X11 backend runs on an X server. Each Weston output becomes an
X window. This is a cheap way to test multi-monitor support of a
Wayland shell, desktop, or applications.
.TP
.I rdp-backend.so
The RDP backend runs in memory without the need of graphical hardware. Access
to the desktop is done by using the RDP protocol. Each connecting
client has its own seat making it a cheap way to test multi-seat support. See
.BR weston-rdp (7),
if installed.
.
.\" ***************************************************************
.SH SHELLS
Each of these shells have its own public protocol interface for clients.
This means that a client must be specifically written for a shell protocol,
otherwise it will not work.
.TP
Desktop shell
Desktop shell is like a modern X desktop environment, concentrating
on traditional keyboard and mouse user interfaces and the familiar
desktop-like window management. Desktop shell consists of the
shell plugin
.I desktop-shell.so
and the special client
.B weston-desktop-shell
which provides the wallpaper, panel, and screen locking dialog.
.TP
Fullscreen shell
Fullscreen shell is intended for a client that needs to take over
whole outputs, often all outputs. This is primarily intended for
running another compositor on Weston. The other compositor does not
need to handle any platform-specifics like DRM/KMS or evdev/libinput.
The shell consists only of the shell plugin
.IR fullscreen-shell.so .
.TP
IVI-shell
In-vehicle infotainment shell is a special purpose shell that exposes
a GENIVI Layer Manager compatible API to controller modules, and a very
simple shell protocol towards clients. IVI-shell starts with loading
.IR ivi-shell.so ,
and then a controller module which may launch helper clients.
.
.\" ***************************************************************
.SH XWAYLAND
XWayland requires a special X.org server to be installed. This X server will
connect to a Wayland server as a Wayland client, and X clients will connect to
the X server. XWayland provides backwards compatibility to X applications in a
Wayland stack.

XWayland is activated by instructing
.BR weston " to load the XWayland module, see " EXAMPLES .
Weston starts listening on a new X display socket, and exports it in the
environment variable
.BR DISPLAY .
When the first X client connects, Weston launches a special X server as a
Wayland client to handle the X client and all future X clients.

It has also its own X window manager where cursor themes and sizes can be
chosen using
.BR XCURSOR_PATH
and
.BR XCURSOR_SIZE " environment variables. See " ENVIRONMENT .
.
.\" ***************************************************************
.SH OPTIONS
.
.SS Weston core options:
.TP
\fB\-\^B\fR\fIbackend.so\fR, \fB\-\-backend\fR=\fIbackend.so\fR
Load
.I backend.so
instead of the default backend. The file is searched for in
.IR "@weston_modules_dir@" ,
or you can pass an absolute path. The default backend is
.I @weston_native_backend@
unless the environment suggests otherwise, see
.IR DISPLAY " and " WAYLAND_DISPLAY .
.TP
\fB\-\^c\fR\fIconfig.ini\fR, \fB\-\-config\fR=\fIconfig.ini\fR
Load
.IR config.ini " instead of " weston.ini .
The argument can also be an absolute path starting with a
.IR / .
If the path is not absolute, it will be searched in the normal config
paths, see
.BR weston.ini (5).
If also
.B --no-config
is given, no configuration file will be read.
.TP
.BR \-\-debug
Enable debug protocol extension
.I weston_debug_v1
which any client can use to receive debugging messages from the compositor.

.B WARNING:
This is risky for two reasons. First, a client may cause a denial-of-service
blocking the compositor by providing an unsuitable file descriptor, and
second, the debug messages may expose sensitive information.
Additionally this will expose weston-screenshooter interface allowing the user
to take screenshots of the outputs using weston-screenshooter application,
which can lead to silently leaking the output contents.  This option should
not be used in production.
.TP
\fB\-\^l\fIscope1,scope2\fR, \fB\-\-logger-scopes\fR=\fIscope1,scope2\fR
Specify to which log scopes should subscribe to. When no scopes are supplied,
the log "log" scope will be subscribed by default. Useful to control which
streams to write data into the logger and can be helpful in diagnosing early
start-up code.
.TP
.BR \-\-version
Print the program version.
.TP
.BR \-\^h ", " \-\-help
Print a summary of command line options, and quit.
.TP
\fB\-\^i\fR\fIN\fR, \fB\-\-idle\-time\fR=\fIN\fR
Set the idle timeout to
.I N
seconds. The default timeout is 300 seconds. When there has not been any
user input for the idle timeout, Weston enters an inactive mode. The
screen fades to black, monitors may switch off, and the shell may lock
the session.
A value of 0 effectively disables the timeout.
.TP
\fB\-\-log\fR=\fIfile.log\fR
Append log messages to the file
.I file.log
instead of writing them to stderr.
.TP
\fB\-\-xwayland\fR
Ask Weston to load the XWayland module.
.TP
\fB\-\-modules\fR=\fImodule1.so,module2.so\fR
Load the comma-separated list of modules. Only used by the test
suite. The file is searched for in
.IR "@weston_modules_dir@" ,
or you can pass an absolute path.
.TP
.BR \-\-no-config
Do not read
.I weston.ini
for the compositor. Avoids e.g. loading compositor modules via the
configuration file, which is useful for unit tests.
.TP
\fB\-\^S\fR\fIname\fR, \fB\-\-socket\fR=\fIname\fR
Weston will listen in the Wayland socket called
.IR name .
Weston will export
.B WAYLAND_DISPLAY
with this value in the environment for all child processes to allow them to
connect to the right server automatically.
.TP
\fB\-\-wait-for-debugger\fR
Raises SIGSTOP before initializing the compositor. This allows the user to
attach with a debugger and continue execution by sending SIGCONT. This is
useful for debugging a crash on start-up when it would be inconvenient to
launch weston directly from a debugger. There is also a
.IR weston.ini " option to do the same."
.
.SS DRM backend options:
See
.BR weston-drm (7).
.
.SS Wayland backend options:
.TP
\fB\-\-display\fR=\fIdisplay\fR
Name of the Wayland display to connect to, see also
.I WAYLAND_DISPLAY
of the environment.
.TP
.B \-\-fullscreen
Create a single fullscreen output
.TP
\fB\-\-output\-count\fR=\fIN\fR
Create
.I N
Wayland windows to emulate the same number of outputs.
.TP
\fB\-\-width\fR=\fIW\fR, \fB\-\-height\fR=\fIH\fR
Make all outputs have a size of
.IR W x H " pixels."
.TP
.B \-\-scale\fR=\fIN\fR
Give all outputs a scale factor of
.I N.
.TP
.B \-\-use\-pixman
Use the pixman renderer.  By default, weston will try to use EGL and
GLES2 for rendering and will fall back to the pixman-based renderer for
software compositing if EGL cannot be used.  Passing this option will force
weston to use the pixman renderer.
.
.SS X11 backend options:
.TP
.B \-\-fullscreen
.TP
.B \-\-no\-input
Do not provide any input devices. Used for testing input-less Weston.
.TP
\fB\-\-output\-count\fR=\fIN\fR
Create
.I N
X windows to emulate the same number of outputs.
.TP
\fB\-\-width\fR=\fIW\fR, \fB\-\-height\fR=\fIH\fR
Make the default size of each X window
.IR W x H " pixels."
.TP
.B \-\-scale\fR=\fIN\fR
Give all outputs a scale factor of
.I N.
.TP
.B \-\-use\-pixman
Use the pixman renderer.  By default weston will try to use EGL and
GLES2 for rendering.  Passing this option will make weston use the
pixman library for software compsiting.
.
.SS RDP backend options:
See
.BR weston-rdp (7).
.
.
.\" ***************************************************************
.SH FILES
.
If the environment variable is set, the configuration file is read
from the respective path.
.PP
.BI $XDG_CONFIG_HOME /weston.ini
.br
.BI $HOME /.config/weston.ini
.br
.
.\" ***************************************************************
.SH ENVIRONMENT
.
.TP
.B DISPLAY
The X display. If
.B DISPLAY
is set, and
.B WAYLAND_DISPLAY
is not set, the default backend becomes
.IR x11-backend.so .
.TP
.B WAYLAND_DEBUG
If set to any value, causes libwayland to print the live protocol
to stderr.
.TP
.B WAYLAND_DISPLAY
The name of the display (socket) of an already running Wayland server, without
the path. The directory path is always taken from
.BR XDG_RUNTIME_DIR .
If
.B WAYLAND_DISPLAY
is not set, the socket name is "wayland-0".

If
.B WAYLAND_DISPLAY
is already set, the default backend becomes
.IR wayland-backend.so .
This allows launching Weston as a nested server.
.TP
.B WAYLAND_SOCKET
For Wayland clients, holds the file descriptor of an open local socket
to a Wayland server.
.TP
.B WESTON_CONFIG_FILE
Weston sets this variable to the absolute path of the configuration file
it loads, or to the empty string if no file is used. Programs that use
.I weston.ini
will read the file specified by this variable instead, or do not read any
file if it is empty. Unset variable causes falling back to the default
name
.IR weston.ini .
.TP
.B XCURSOR_PATH
Set the list of paths to look for cursors in. It changes both
libwayland-cursor and libXcursor, so it affects both Wayland and X11 based
clients. See
.B xcursor
(3).
.TP
.B XCURSOR_SIZE
This variable can be set for choosing an specific size of cursor. Affect
Wayland and X11 clients. See
.B xcursor
(3).
.TP
.B XDG_CONFIG_HOME
If set, specifies the directory where to look for
.BR weston.ini .
.TP
.B XDG_RUNTIME_DIR
The directory for Weston's socket and lock files.
Wayland clients will automatically use this.
.
.\" ***************************************************************
.SH BUGS
Bugs should be reported to the freedesktop.org bugzilla at
https://bugs.freedesktop.org with product "Wayland" and
component "weston".
.
.\" ***************************************************************
.SH WWW
http://wayland.freedesktop.org/
.
.\" ***************************************************************
.SH EXAMPLES
.IP "Launch Weston with the DRM backend on a VT"
weston-launch
.IP "Launch Weston with the DRM backend and XWayland support"
weston-launch -- --xwayland
.IP "Launch Weston (wayland-1) nested in another Weston instance (wayland-0)"
WAYLAND_DISPLAY=wayland-0 weston -Swayland-1
.IP "From an X terminal, launch Weston with the x11 backend"
weston
.
.\" ***************************************************************
.SH "SEE ALSO"
.BR weston-bindings (7),
.BR weston-debug (1),
.BR weston-drm (7),
.BR weston-rdp (7),
.BR weston.ini (5)