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Xvfb(1X)
X11R6
NAME
  Xvfb - virtual framebuffer X server

SYNOPSIS
  Xvfb [option...]

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

  -config configuration file
      Specifies the name of a configuration file to use to configure the
      loadable Xvfb server.  The default configuration file is
      /usr/var/X11/Xvfb.conf

  -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 interface.

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

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 Xvfb command supports the run-time loading and execution of X virtual
  frame buffer server libraries on Tru64 UNIX platforms.  The command loads
  appropriate libraries installed on the workstation and can be configured to
  use any or all of the extension libraries available on your workstation.

  The primary use of this server is intended to be server testing. The mfb or
  cfb code for any depth can be exercised with this server without the need
  for real hardware that supports the desired depths.

  A secondary use is testing clients against unusual depths and screen
  configurations.

MODULAR XVFB SERVER
  When the Xvfb command is started, it uses a set of internal default lists
  of components to build an X server.  It also reads a system configuration
  file (/usr/var/X11/Xvfb.conf or the file specified by the -config option)
  to supplement or replace components on the lists. The command loads all
  system and core components and then transfers execution to the core
  components.

  The core components then load the list of extensions provided and
  initialize the extensions.  Extensions listed in the configuration file are
  loaded when a client queries the extension.  The core components also load
  any font renderers, transport handlers, and authorization protocol methods
  specified in the configurations.

  The configuration file syntax is described in the Xdec(1X) man page.

  The Xvfb command searches for libraries using the library_path specified in
  the configuration file or the LD_LIBRARY_PATH environment variable.  Each
  component in the colon separated path is searched.  The default search path
  is /usr/shlib/X11:/usr/shlib

  The default system installation provides a sample configuration file
  /usr/var/X11/Xvfb.conf. It contains comments and shows examples for setting
  up library lists, library sub-lists, the library search path, and sample
  argument lists.

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 /usr/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
      /usr/tmp for the framebuffer.

  xwud -in /usr/tmp/Xvfb_screen0
      Displays screen 0 of the server started by the preceding example.

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.

SEE ALSO
  X(1X), Xdec(1X), xwd(1X), xwud(1X), <XWDFile.h>

AUTHORS
  David P. Wiggins, X Consortium, Inc.

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