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xfs - X font server
xfs
[-config configuration_file] [-daemon] [-droppriv] [-ls listen_socket] [-nodaemon]
[-port tcp_port] [-user username]
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 administrator, and started
via boot files like /etc/rc.local. Users may also wish to start private
font servers for specific sets of fonts.
- -config configuration_file
- Specifies the configuration file the font server will use. If this parameter
is not specified, the default file, /usr/X11R6/lib/X11/fs/config will be
used.
- -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.
- -port tcp_port
- Specifies the
TCP port number on which the server will listen for connections. The default
port number is 7100.
- -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 xfs was built to daemonize by default).
- -droppriv
- If specified, xfs will attempt to run as user and group xfs (unless the
-user option is used). This has been implemented for security reasons, as
xfs may have undiscovered buffer overflows or other paths for possible
exploit, both local and remote. With 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.
- -nodaemon
- When xfs is built to daemonize (run
in the background) by default, this prevents that and starts xfs up as
a regular process.
- -user username
- This is equivalent to -droppriv except that
xfs will run as user username.
- SIGTERM
- This causes the font server
to exit cleanly.
- SIGUSR1
- This signal is used to cause the server to re-read
its configuration file.
- SIGUSR2
- This signal is used to cause the server
to flush any cached data it may have.
- SIGHUP
- This signal is used to cause
the server to reset, closing all active connections and re-reading the configuration
file.
The configuration language is a list of keyword and value
pairs. Each keyword is followed by an '=' and then the desired value.
Recognized
keywords include:
- catalogue (list of string)
- Ordered list of font path
element names. Use of the keyword "catalogue" is very misleading at present,
the current implementation only supports a single catalogue ("all"), containing
all of the specified fonts.
- alternate-servers (list of string)
- List of alternate
servers for this font server.
- client-limit (cardinal)
- 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)
- Whether this
font server should attempt to clone itself when it reachs the client-limit.
- default-point-size (cardinal)
- The default pointsize (in decipoints) for fonts
that don't specify. The default is 120.
- default-resolutions (list of resolutions)
- Resolutions
the server supports by default. This information may be used as a hint for
pre-rendering, and substituted for scaled fonts which do not specify a
resolution. A resolution is a comma-separated pair of x and y resolutions
in pixels per inch. Multiple resolutions are separated by commas.
- error-file
(string)
- Filename of the error file. All warnings and errors will be logged
here.
- no-listen (trans-type)
- Disable a transport type. For example, TCP/IP
connections can be disabled with no-listen tcp
- port (cardinal)
- TCP port on
which the server will listen for connections.
- use-syslog (boolean)
- Whether
syslog(3)
(on supported systems) is to be used for errors.
- deferglyphs
(string)
- Set the mode for delayed fetching and caching of glyphs. Value
is "none", meaning deferred glyphs is disabled, "all", meaning it is enabled
for all fonts, and "16", meaning it is enabled only for 16-bits fonts.
#
# 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 its limit, start up a new one
clone-self = on
# alternate font servers for clients to use
alternate-servers = hansen:7101,hansen:7102
# where to look for fonts
# the first is a set of Speedo outlines, the second is a set of
# misc bitmaps and the last is a set of 100dpi bitmaps
#
catalogue = /usr/X11R6/lib/X11/fonts/speedo,
/usr/X11R6/lib/X11/fonts/misc,
/usr/X11R6/lib/X11/fonts/100dpi/
# in 12 points, decipoints
default-point-size = 120
# 100 x 100 and 75 x 75
default-resolutions = 100,100,75,75
use-syslog = off
One of the following forms can be used to name a font
server that accepts TCP connections:
tcp/hostname:port
tcp/hostname:port/cataloguelist
The hostname specifies the name (or decimal numeric address) of the machine
on which the font server is running. The port is the decimal TCP port on
which the font server is listening for connections. The cataloguelist specifies
a list of catalogue names, with '+' as a separator.
Examples: tcp/fs.x.org:7100,
tcp/18.30.0.212:7101/all.
One of the following forms can be used to name a
font server that accepts DECnet connections:
decnet/nodename::font$objname
decnet/nodename::font$objname/cataloguelist
The nodename specifies the name (or decimal numeric address) of the machine
on which the font server is running. The objname is a normal, case-insensitive
DECnet object name. The cataloguelist specifies a list of catalogue names,
with '+' as a separator.
Examples: DECnet/SRVNOD::FONT$DEFAULT, decnet/44.70::font$special/symbols.
X(7x)
, The X Font Service Protocol,
Font server implementation overview
Multiple catalogues should be supported.
Dave Lemke, Network Computing Devices, Inc
Keith Packard, Massachusetts Institute of Technology
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