Xvfb man page on Peanut

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XVFB(1)								       XVFB(1)

NAME
       Xvfb - virtual framebuffer X server for X Version 11

SYNOPSIS
       Xvfb [ option ] ...

DESCRIPTION
       Xvfb  is	 an X server that can run on machines with no display hardware
       and no physical input devices.  It emulates a  dumb  framebuffer	 using
       virtual memory.

       The  primary use of this server was intended to be server testing.  The
       fb code for any depth can be exercised with  this  server  without  the
       need  for real hardware that supports the desired depths.  The X commu‐
       nity has found many  other  novel  uses	for  Xvfb,  including  testing
       clients	against	 unusual depths and screen configurations, doing batch
       processing with Xvfb as a background rendering engine, load testing, as
       an  aid	to  porting  the  X server to a new platform, and providing an
       unobtrusive way to run applications that don't really need an X	server
       but insist on having one anyway.

OPTIONS
       In  addition  to	 the normal server options described in the Xserver(1)
       manual page, Xvfb accepts the following command line switches:

       -screen screennum WxHxD
	   This option creates screen screennum and sets  its  width,  height,
	   and	depth  to W, H, and D respectively.  By default, only screen 0
	   exists and has the dimensions 1280x1024x8.

       -pixdepths list-of-depths
	   This option specifies a list	 of  pixmap  depths  that  the	server
	   should  support  in addition to the depths implied by the supported
	   screens.  list-of-depths is a space-separated list of integers that
	   can have values from 1 to 32.

       -fbdir framebuffer-directory
	   This	 option	 specifies  the	 directory  in which the memory mapped
	   files containing the framebuffer memory  should  be	created.   See
	   FILES.   This option only exists on machines that have the mmap and
	   msync system calls.

       -shmem
	   This option specifies that the framebuffer should be put in	shared
	   memory.   The  shared  memory ID for each screen will be printed by
	   the server.	The shared memory is in xwd format.  This option  only
	   exists  on  machines that support the System V shared memory inter‐
	   face.

       If neither -shmem nor -fbdir is specified, the framebuffer memory  will
       be allocated with malloc().

       -linebias n
	   This option specifies how to adjust the pixelization of thin lines.
	   The value n is a bitmask of octants in which	 to  prefer  an	 axial
	   step	 when  the Bresenham error term is exactly zero.  See the file
	   Xserver/mi/miline.h for more information.  This option is  probably
	   only	 useful	 to  server developers to experiment with the range of
	   line pixelization possible with the fb code.

       -blackpixel pixel-value, -whitepixel pixel-value
	   These options specify the black and white pixel values  the	server
	   should use.

FILES
       The following files are created if the -fbdir option is given.

       framebuffer-directory/Xvfb_screen<n>
	   Memory  mapped  file	 containing screen n's framebuffer memory, one
	   file per screen.  The file is in xwd format.	 Thus, taking a	 full-
	   screen  snapshot  can  be  done  with  a file copy command, and the
	   resulting snapshot will even contain the cursor image.

EXAMPLES
       Xvfb :1 -screen 0 1600x1200x32
	       The server will listen for connections as server number 1,  and
	       screen 0 will be depth 32 1600x1200.

       Xvfb :1 -screen 1 1600x1200x16
	       The server will listen for connections as server number 1, will
	       have   the   default   screen   configuration   (one    screen,
	       1280x1024x8), and screen 1 will be depth 16 1600x1200.

       Xvfb -pixdepths 3 27 -fbdir /var/tmp
	       The server will listen for connections as server number 0, will
	       have   the   default   screen   configuration   (one    screen,
	       1280x1024x8),  will also support pixmap depths of 3 and 27, and
	       will use memory mapped files in /var/tmp for the framebuffer.

       xwud -in /var/tmp/Xvfb_screen0
	       Displays screen 0 of the server started by the preceding	 exam‐
	       ple.

SEE ALSO
       X(7), Xserver(1), xwd(1), xwud(1), XWDFile.h

AUTHORS
       David P. Wiggins, The Open Group, Inc.

X Version 11		     xorg-server 1.6.99.1		       XVFB(1)
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