CentOS 7.0 - man page for xephyr (centos section 1)
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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
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
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
Allow the Xephyr window to be resized, even if not embedded into a parent window.
By default, the Xephyr window has a fixed size.
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.
o Rotated displays are currently updated via full blits. This is slower than a normal ori-
entated display. Debug mode will therefore not be of much use rotated.
o The '-host-cursor' cursor is static in its appearance.
o The build gets a warning about 'nanosleep'. I think the various '-D' build flags are
causing this. I haven't figured as yet how to work round it. It doesn't appear to break
o Keyboard handling is basic but works.
o Mouse button 5 probably won't work.
Matthew Allum <email@example.com> 2004
X Version 11 xorg-server 1.15.0 Xephyr(1)
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