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Xephyr(1) General Commands Manual Xephyr(1)

Xephyr - X server outputting to a window on a pre-existing X display

Xephyr [:display] [option ...]

Xephyr is a kdrive server that outputs to a window on a pre-existing "host" X display. Think Xnest but with support for modern extensions like composite, damage and randr.

Unlike Xnest which is an X proxy, i.e. limited to the capabilities of the host X server, Xephyr is a real X server which uses the host X server window as "framebuffer" via fast SHM XImages.

It also has support for "visually" debugging what the server is painting.

The server accepts all the standard options of Xserver(1) and the following additional options:

sets the screen size.
uses existing window id . If a -screen argument follows a -parent argument, this screen is embedded into the given window.
set 'cursor acceleration': The host's cursor is reused. This is only really there to aid debugging by avoiding server paints for the cursor. Performance improvement is negligible.
Allow the Xephyr window to be resized, even if not embedded into a parent window. By default, the Xephyr window has a fixed size.
Disable grabbing the keyboard and mouse.

Send a SIGUSR1 to the server (e.g. pkill -USR1 Xephyr) to toggle the debugging mode. In this mode red rectangles are painted to screen areas getting painted before painting the actual content. The delay between this can be altered by setting a XEPHYR_PAUSE env var to a value in micro seconds.

X(7), Xserver(1)

Matthew Allum <> 2004

xorg-server 21.1.13 X Version 11