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    Command:

    xfs

    
    
    

    SYNOPSIS

           xfs [ -config configuration_file ] [ -daemon ] [ -droppriv ] [ -ls lis-
           ten_socket ] [ -nodaemon ] [ -port tcp_port ] [ -user username ]
    
    
    

    DESCRIPTION

           xfs is the X Window System font server.  It supplies fonts to X  Window
           System display servers.  The server is usually run by a system adminis-
           trator, and started via init(8).  Users may also wish to start  private
           font servers for specific sets of fonts.
    
           To  connect  to a font server, see the documentation for your X server;
           it likely supports the syntax documented in  the  "FONT  SERVER  NAMES"
           section of X(7).
    
    
    

    OPTIONS

           -config configuration_file
                  specifies  the configuration file xfs will use.  If this parame-
                  ter is not specified, xfs will read its configuration  from  the
                  default file, /etc/X11/fs/config.
    
           -daemon
                  instructs  xfs  to fork and go into the background automatically
                  at startup.  If this option is not specified, xfs will run as  a
                  regular  process  (unless it was built to daemonize by default).
                  When running as a daemon, xfs will attempt to create a  file  in
                  which  it  stores its process ID, and will delete that file upon
                  exit;
    
           -droppriv
                  instructs xfs to attempt to run as user and  group  xfs  (unless
                  the  -user option is used).  This has been implemented for secu-
                  rity reasons, as xfs may have undiscovered buffer  overflows  or
                  other  paths  for possible exploit, both local and remote.  When
                  using this option, you may also wish  to  specify  'no-listen  =
                  tcp'  in the config file, which ensures that xfs will not to use
                  a TCP port at all.  By default, xfs runs with the user and group
                  IDs of the user who invoked it.
    
           -ls listen_socket
                  specifies  a  file descriptor which is already set up to be used
                  as the listen socket.  This option is only intended to  be  used
                  by  the  font  server itself when automatically spawning another
                  copy of itself to handle additional connections.
    
           -nodaemon
                  instructs xfs not to daemonize (fork and detach  from  its  con-
                  trolling  terminal).   This  option only has an effect if xfs is
                  built to daemonize by default, which is not the stock configura-
                  tion.
    
           -port tcp_port
                  specifies  the  TCP  port number on which the server will listen
    
       Configuration File Format
           xfs reads its configuration from a text file (see the -config option in
           the  "OPTIONS" section above).  The configuration language is a list of
           keyword and value pairs.  Each keyword is followed by  an  equals  sign
           ('=') and then the desired value.
    
           Recognized keywords include:
    
           alternate-servers (list of strings)
                  lists  alternate  servers  for  this font server.  See the "FONT
                  SERVER NAMES" section of X(7) for the syntax of the string.
    
           catalogue (list of strings)
                  declares as ordered list of font path element names  from  which
                  fonts  will be served.  The current implementation only supports
                  a single catalogue  ("all")  containing  all  of  the  specified
                  fonts.  A  special  directory with symlinks to font paths can be
                  specified using a catalogue:<dir> entry. See the  CATALOGUE  DIR
                  section below for details.
    
           client-limit (cardinal)
                  determines  the  number of clients this font server will support
                  before refusing service.  This is useful for tuning the load  on
                  each individual font server.
    
           clone-self (boolean)
                  indicates  whether  this  font  server  should  attempt to clone
                  itself  when  the  number  of  connected  clients  reaches   the
                  client-limit.
    
           default-point-size (cardinal)
                  The  default  pointsize  (in  decipoints) for font requests that
                  don't specify a point size.  The default is 120.
    
           default-resolutions (list of resolutions)
                  indicates the resolutions the server supports by default.   This
                  information may be used as a hint for pre-rendering, and substi-
                  tuted into requests for scaled fonts which do not specify a res-
                  olution.   A  resolution is a comma-separated pair of horizontal
                  and vertical resolutions in pixels per inch.   Multiple  resolu-
                  tions are separated by commas.
    
           deferglyphs (string)
                  sets  the  mode  for  delayed  fetching  and  caching of glyphs.
                  string should be one of 'none', meaning glyphs deferment is dis-
                  abled,  'all',  meaning  it  is enabled for all fonts, and '16',
                  meaning it is enabled only for 16-bit fonts.
    
           error-file (string)
                  indicates the filename of the  error  file.   All  warnings  and
                  errors  will  be logged here, unless use-syslog is set to a true
                  value (see below).
    
    
    

    CATALOGUE DIR

           You can specify  a  special  kind  of  font  path  in  the  form  cata-
           logue:<dir>.   The directory specified after the catalogue: prefix will
           be scanned for symlinks and each symlink destination will be added as a
           local fontfile FPE.
    
           The  symlink  can  be  suffixed by attributes such as 'unscaled', which
           will be passed through to the underlying fontfile FPE. The only  excep-
           tion  is  the  newly introduced 'pri' attribute, which will be used for
           ordering the font paths specified by the symlinks.
    
           An example configuration:
    
               75dpi:unscaled:pri=20 -> /usr/share/X11/fonts/75dpi
               ghostscript:pri=60 -> /usr/share/fonts/default/ghostscript
               misc:unscaled:pri=10 -> /usr/share/X11/fonts/misc
               type1:pri=40 -> /usr/share/X11/fonts/Type1
               type1:pri=50 -> /usr/share/fonts/default/Type1
    
           This will add /usr/share/X11/fonts/misc  as  the  first  FPE  with  the
           attribute  the  attribute unscaled etc. This is functionally equivalent
           to setting the following font path:
    
               /usr/share/X11/fonts/misc:unscaled,
               /usr/share/X11/fonts/75dpi:unscaled,
               /usr/share/X11/fonts/Type1,
               /usr/share/fonts/default/Type1,
               /usr/share/fonts/default/ghostscript
    
       Example Configuration File
           #
           # sample font server configuration file
           #
    
           # allow a max of 10 clients to connect to this font server.
           client-limit = 10
    
           # When a font server reaches the above limit, start up a new one.
           clone-self = on
    
           # Identify alternate font servers for clients to use.
           alternate-servers = hansen:7101,hansen:7102
    
           # Look for fonts in the following directories.  The first is a set of
           # TrueType outlines, the second is a set of misc bitmaps (such as terminal
           # and cursor fonts), and the last is a set of 100dpi bitmaps.
           #
           catalogue = /usr/X11R6/lib/X11/fonts/TTF,
                       /usr/X11R6/lib/X11/fonts/misc,
                       /usr/X11R6/lib/X11/fonts/100dpi/
    
           # in 12 points, decipoints
           default.  However, these messages can be sent to an alternate  location
           via the error-file and use-syslog configuration variables; see "Config-
           uration File Format", above.
    
    
    

    ASYNCHRONOUS EVENTS

           xfs handles the following signals specially:
    
           SIGTERM
                  causes the font server to exit cleanly.
    
           SIGUSR1
                  causes xfs to re-read its configuration file.
    
           SIGUSR2
                  causes xfs to flush any cached data it may have.
    
           SIGHUP causes xfs to reset, closing all active connections and re-read-
                  ing the configuration file.
    
    
    

    BUGS

           Multiple catalogues should be supported.
    
    
    

    FUTURE DIRECTIONS

           Significant  further development of xfs is unlikely.  One of the origi-
           nal motivations behind it was  the  single-threaded  nature  of  the  X
           server  --  a  user's  X  session  could seem to 'freeze up' while the X
           server took a moment to rasterize a font.   This  problem  with  the  X
           server, which remains single-threaded in all popular implementations to
           this day, has been mitigated on two fronts: machines have  gotten  much
           faster,  and  client-side  font  rendering  (particularly  via  the Xft
           library) is the norm in contemporary software.
    
    
    

    AUTHORS

           Dave Lemke, Network Computing Devices, Inc
           Keith Packard, Massachusetts Institute of Technology
    
    
    

    SEE ALSO

           X(7), xfsinfo(1), fslsfonts(1), init(8), syslog(3), The X Font  Service
           Protocol, Font Server Implementation Overview
    
    
    

    X Version 11 xfs 1.0.8 xfs(1)

    
    
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