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  man pages->Tru64 Unix man pages -> Xvfb (1X)              



NAME    [Toc]    [Back]

       Xvfb - virtual framebuffer X server

SYNOPSIS    [Toc]    [Back]

       Xvfb [option...]

OPTIONS    [Toc]    [Back]

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

       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

       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    [Toc]    [Back]

       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

EXAMPLES    [Toc]    [Back]

       The server will listen for connections as server number 1,
       and screen 0 will be depth 32 1600x1200.  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.  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.  Displays
 screen 0 of the  server  started  by  the  preceding

FILES    [Toc]    [Back]

       The  following  files  are created if the -fbdir option is
       given.  Memory mapped file containing  screen  n's  framebuffer
  memory,  one  file per screen.  The file is in xwd

SEE ALSO    [Toc]    [Back]

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

AUTHORS    [Toc]    [Back]

       David P. Wiggins, X Consortium, Inc.

[ Back ]
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