Xephyr man page on Raspbian

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Xephyr(1)							     Xephyr(1)

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

SYNOPSIS
       Xephyr [:display] [option ...]

DESCRIPTION
       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 paint‐
       ing.

OPTIONS
       -screen widthxheight
	       sets the screen size.

       -parent id
	       uses exiting window id .	 If a -screen argument follows a -par‐
	       ent argument, this screen is embedded into the given window.

       -host-cursor
	       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.

SIGNALS
       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.

CAVEATS
       · Rotated displays are currently updated via full blits. This is slower
	 than a normal orientated display. Debug mode will therefore not be of
	 much use rotated.

       · The '-host-cursor' cursor is static in its appearance.

       · 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 anything however.

       · Keyboard handling is basic but works.

       Mouse button 5 probably won't work.

SEE ALSO
       X(7), Xserver(1)

AUTHOR
       Matthew Allum <mallum@o-hand.com> 2004

X Version 11		       xorg-server 1.7.7		     Xephyr(1)
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