User Commands Xephyr(1)
NAME
Xephyr - X server outputting to a window on a pre-existing X
display
SYNOPSIS
/usr/bin/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 capa-
bilities 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
-screen widthxheight
sets the screen size.
-parent id
uses exiting window id . If a -screen argument fol-
lows 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. Perfor-
mance 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 fig-
ured as yet how to work round it. It doesn't appear to
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User Commands Xephyr(1)
break anything however.
+o Keyboard handling is basic but works.
Mouse button 5 probably won't work.
SEE ALSO
X(5), Xserver(1)
AUTHOR
Matthew Allum 2004
ATTRIBUTES
See attributes(5) for descriptions of the following attri-
butes:
____________________________________________________________
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
|_____________________________|_____________________________|
| Availability | x11/server/xorg |
|_____________________________|_____________________________|
| Interface Stability | Volatile |
|_____________________________|_____________________________|
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