Xephyr(1)                                                     General Commands Manual                                                    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 painting.

OPTIONS

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

       -screen widthxheight
               sets the screen size.

       -parent id
               uses exiting window id .  If a -screen argument follows a -parent 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

       o 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.

       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 anything however.

       o Keyboard handling is basic but works.

       o 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 1.12.4                                                       Xephyr(1)