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XSERVER(1)							    XSERVER(1)

       Xserver - X Window System display server

       X [option ...]

       X  is  the  generic name	for the	X Window System	display	server.	 It is
       frequently a link or a copy of the appropriate server binary for	 driv-
       ing the most frequently used server on a	given machine.

       The  X  server  is  usually  started from the X Display Manager program
       xdm(1) or a similar display manager program.  This utility is run  from
       the  system  boot  files	 and takes care	of keeping the server running,
       prompting for usernames and passwords, and starting up  the  user  ses-

       Installations  that run more than one window system may need to use the
       xinit(1)	utility	instead	of a display manager.  However,	xinit is to be
       considered  a tool for building startup scripts and is not intended for
       use by end users.  Site administrators are strongly urged to use	a dis-
       play manager, or	build other interfaces for novice users.

       The  X  server  may  also  be started directly by the user, though this
       method is usually reserved for testing and is not recommended for  nor-
       mal  operation.	 On some platforms, the	user must have special permis-
       sion to start the X server, often because  access  to  certain  devices
       (e.g. /dev/mouse) is restricted.

       When  the  X server starts up, it typically takes over the display.  If
       you are running on a workstation	whose console is the display, you  may
       not be able to log into the console while the server is running.

       Many X servers have device-specific command line	options.  See the man-
       ual pages for the individual  servers  for  more	 details;  a  list  of
       server-specific manual pages is provided	in the SEE ALSO	section	below.

       All of the X servers accept the command line options  described	below.
       Some  X	servers	 may have alternative ways of providing	the parameters
       described here, but the values provided via the	command	 line  options
       should override values specified	via other mechanisms.

	       The  X server runs as the given displaynumber, which by default
	       is 0.  If multiple X servers are	to  run	 simultaneously	 on  a
	       host,  each must	have a unique display number.  See the DISPLAY
	       NAMES section of	the X(7) manual	page to	learn how  to  specify
	       which display number clients should try to use.

       -a number
	       sets  pointer  acceleration  (i.e.  the	ratio  of  how much is
	       reported	to how much the	user actually moved the	pointer).

       -ac     disables	host-based access control mechanisms.  Enables	access
	       by  any host, and permits any host to modify the	access control
	       list.  Use with extreme caution.	 This option exists  primarily
	       for running test	suites remotely.

       -audit level
	       sets  the  audit	 trail level.  The default level is 1, meaning
	       only connection rejections are reported.	 Level 2  additionally
	       reports	all  successful	 connections and disconnects.  Level 4
	       enables messages	 from  the  SECURITY  extension,  if  present,
	       including  generation and revocation of authorizations and vio-
	       lations of the security policy.	Level 0	turns  off  the	 audit
	       trail.  Audit lines are sent as standard	error output.

       -auth authorization-file
	       specifies  a  file which	contains a collection of authorization
	       records used to authenticate access.  See also the  xdm(1)  and
	       Xsecurity(7) manual pages.

       -bs     disables	backing	store support on all screens.

       -br     sets  the  default  root	 window	 to solid black	instead	of the
	       standard	root weave pattern.

       -c      turns off key-click.

       c volume
	       sets key-click volume (allowable	range: 0-100).

       -cc class
	       sets the	visual class for the root  window  of  color  screens.
	       The  class  numbers  are	 as  specified in the X	protocol.  Not
	       obeyed by all servers.

       -co filename
	       sets  name   of	 RGB   color   database.    The	  default   is

       -core   causes the server to generate a core dump on fatal errors.

       -deferglyphs whichfonts
	       specifies  the  types  of  fonts	 for  which  the server	should
	       attempt to use deferred glyph loading.  whichfonts can  be  all
	       (all fonts), none (no fonts), or	16 (16 bit fonts only).

       -dpi resolution
	       sets  the  resolution for all screens, in dots per inch.	 To be
	       used when the server cannot determine the screen	 size(s)  from
	       the hardware.

       dpms    enables	DPMS  (display	power management services), where sup-
	       ported.	The default state is platform and  configuration  spe-

       -dpms   disables	DPMS (display power management services).  The default
	       state is	platform and configuration specific.

	       disables	named extension.   If an  unknown  extension  name  is
	       specified, a list of accepted extension names is	printed.

	       enables	named  extension.    If	 an  unknown extension name is
	       specified, a list of accepted extension names is	printed.

       -f volume
	       sets feep (bell)	volume (allowable range: 0-100).

       -fc cursorFont
	       sets default cursor font.

       -fn font
	       sets the	default	font.

       -fp fontPath
	       sets the	search path for	fonts.	This path is a comma separated
	       list  of	directories which the X	server searches	for font data-
	       bases.  See the FONTS section of	 this  manual  page  for  more
	       information and the default list.

       -help   prints a	usage message.

       -I      causes all remaining command line arguments to be ignored.

       -maxbigreqsize size
	       sets the	maximum	big request to size MB.

       -nolisten trans-type
	       disables	a transport type.  For example,	TCP/IP connections can
	       be disabled with	-nolisten tcp.	This option may	be issued mul-
	       tiple  times to disable listening to different transport	types.

	       prevents	a server reset when  the  last	client	connection  is
	       closed.	 This  overrides  a  previous  -terminate command line

       -p minutes
	       sets screen-saver pattern cycle time in minutes.

       -pn     permits the server to continue running if it fails to establish
	       all  of its well-known sockets (connection points for clients),
	       but establishes at least	one.  This option is set by default.

       -nopn   causes the server to exit if it fails to	establish all  of  its
	       well-known sockets (connection points for clients).

       -r      turns off auto-repeat.

       r       turns on	auto-repeat.

       -retro  starts the stipple with the classic stipple and cursor visible.
	       The default is to start with a black root window, and  to  sup-
	       press display of	the cursor until the first time	an application
	       calls XDefineCursor().  For the Xorg server, this also  changes
	       the  default  for  the  DontZap	option	to  FALSE.  For	kdrive
	       servers,	this implies -zap.

       -s minutes
	       sets screen-saver timeout time in minutes.

       -su     disables	save under support on all screens.

       -t number
	       sets pointer acceleration threshold in pixels (i.e.  after  how
	       many pixels pointer acceleration	should take effect).

	       causes the server to terminate at server	reset, instead of con-
	       tinuing to run.	This overrides	a  previous  -noreset  command
	       line option.

       -to seconds
	       sets default connection timeout in seconds.

       -tst    disables	 all  testing extensions (e.g.,	XTEST, XTrap, XTestEx-
	       tension1, RECORD).

       ttyxx   ignored,	for servers started the	ancient	way (from init).

       v       sets video-off screen-saver preference.

       -v      sets video-on screen-saver preference.

       -wm     forces the default backing-store	of all	windows	 to  be	 When-
	       Mapped.	 This  is  a  backdoor way of getting backing-store to
	       apply to	all windows.  Although all mapped  windows  will  have
	       backing	store,	the  backing store attribute value reported by
	       the server for a	window will be the last	value established by a
	       client.	 If it has never been set by a client, the server will
	       report the default value, NotUseful.  This behavior is required
	       by  the	X  protocol,  which  allows  the  server to exceed the
	       client's	backing	store expectations but does not	provide	a  way
	       to tell the client that it is doing so.

       -wr     sets  the  default  root	 window	 to solid white	instead	of the
	       standard	root weave pattern.

       -x extension
	       loads the specified extension at	init.  This  is	 a  no-op  for
	       most implementations.

	       enables(+)  or disables(-) the XINERAMA extension.  The default
	       state is	platform and configuration specific.

       Some X servers accept the following options:

       -ld kilobytes
	       sets the	data space limit of the	server to the specified	number
	       of  kilobytes.  A value of zero makes the data size as large as
	       possible.  The default value of -1 leaves the data space	 limit

       -lf files
	       sets the	number-of-open-files limit of the server to the	speci-
	       fied number.  A value of	zero makes the limit as	large as  pos-
	       sible.  The default value of -1 leaves the limit	unchanged.

       -ls kilobytes
	       sets  the stack space limit of the server to the	specified num-
	       ber of kilobytes.  A value of zero  makes  the  stack  size  as
	       large  as  possible.   The default value	of -1 leaves the stack
	       space limit unchanged.

       -logo   turns on	the X Window System logo display in the	 screen-saver.
	       There is	currently no way to change this	from a client.

       nologo  turns off the X Window System logo display in the screen-saver.
	       There is	currently no way to change this	from a client.

       -render default|mono|gray|color sets the	color allocation  policy  that
	       will be used by the render extension.

	       default selects	the  default  policy  defined  for the display
		       depth of	the X server.

	       mono    don't use any color cell.

	       gray    use a gray map of 13  color  cells  for	the  X	render

	       color   use  a  color  cube of at most 4*4*4 colors (that is 64
		       color cells).

	       disables	smart scheduling on platforms that support  the	 smart

       -schedInterval interval
	       sets the	smart scheduler's scheduling interval to interval mil-

       X servers that support XDMCP have the following	options.   See	the  X
       Display Manager Control Protocol	specification for more information.

       -query hostname
	       enables	XDMCP  and  sends Query	packets	to the specified host-

	       enable XDMCP and	broadcasts BroadcastQuery packets to the  net-
	       work.   The first responding display manager will be chosen for
	       the session.

       -multicast [address [hop	count]]
	       Enable XDMCP and	multicast BroadcastQuery packets to the	  net-
	       work.   The  first responding display manager is	chosen for the
	       session.	 If an address is specified, the multicast is sent  to
	       that  address.	If  no	address	is specified, the multicast is
	       sent to the default XDMCP IPv6 multicast	group.	If a hop count
	       is  specified, it is used as the	maximum	hop count for the mul-
	       ticast.	If no hop count	is specified, the multicast is set  to
	       a  maximum of 1 hop, to prevent the multicast from being	routed
	       beyond the local	network.

       -indirect hostname
	       enables XDMCP and send IndirectQuery packets to	the  specified

       -port port-number
	       uses  the  specified  port-number for XDMCP packets, instead of
	       the default.  This option must be specified before any  -query,
	       -broadcast, -multicast, or -indirect options.

       -from local-address
	       specifies the local address to connect from (useful if the con-
	       necting host has	 multiple  network  interfaces).   The	local-
	       address	may  be	 expressed  in any form	acceptable to the host
	       platform's gethostbyname(3) implementation.

       -once   causes the server to terminate (rather  than  reset)  when  the
	       XDMCP session ends.

       -class display-class
	       XDMCP  has  an  additional  display  qualifier used in resource
	       lookup for display-specific options.   This  option  sets  that
	       value,  by  default  it is "MIT-Unspecified" (not a very	useful

       -cookie xdm-auth-bits
	       When testing XDM-AUTHENTICATION-1,  a  private  key  is	shared
	       between the server and the manager.  This option	sets the value
	       of that private data (not that it is very private, being	on the
	       command line!).

       -displayID display-id
	       Yet  another  XDMCP specific value, this	one allows the display
	       manager to identify each	display	so  that  it  can  locate  the
	       shared key.

       X  servers  that	 support the XKEYBOARD (a.k.a. "XKB") extension	accept
       the following options.  All layout files	specified on the command  line
       must be located in the XKB base directory or a subdirectory, and	speci-
       fied as the relative path from the XKB base directory.  The default XKB
       base directory is /usr/local/lib/X11/xkb.

       [+-]kb  enables(+) or disables(-) the XKEYBOARD extension.

       [+-]accessx [ timeout [ timeout_mask [ feedback [ options_mask ]	] ] ]
	       enables(+) or disables(-) AccessX key sequences.

       -xkbdir directory
	       base  directory	for keyboard layout files.  This option	is not
	       available for setuid X servers (i.e., when the X	server's  real
	       and effective uids are different).

       -ardelay	milliseconds
	       sets  the autorepeat delay (length of time in milliseconds that
	       a key must be depressed before autorepeat starts).

       -arinterval milliseconds
	       sets the	autorepeat interval (length of	time  in  milliseconds
	       that should elapse between autorepeat-generated keystrokes).

       -xkbmap filename
	       loads keyboard description in filename on server	startup.

       The  X server supports client connections via a platform-dependent sub-
       set of the following transport types: TCPIP, Unix Domain	sockets,  DEC-
       net,  and several varieties of SVR4 local connections.  See the DISPLAY
       NAMES section of	the X(7) manual	page to	learn  how  to	specify	 which
       transport type clients should try to use.

       The  X  server  implements a platform-dependent subset of the following
       authorization protocols:	MIT-MAGIC-COOKIE-1, XDM-AUTHORIZATION-1,  XDM-
       AUTHORIZATION-2,	 SUN-DES-1,  and MIT-KERBEROS-5.  See the Xsecurity(7)
       manual page for information on the operation of these protocols.

       Authorization data required by the above	protocols  is  passed  to  the
       server  in  a  private  file  named with	the -auth command line option.
       Each time the server is about to	accept the first  connection  after  a
       reset  (or  when	 the server is starting), it reads this	file.  If this
       file contains any authorization records,	the local host is not automat-
       ically allowed access to	the server, and	only clients which send	one of
       the authorization records contained in the file in the connection setup
       information  will  be  allowed  access.	 See the Xau manual page for a
       description of the binary format	of this	file.  See xauth(1) for	 main-
       tenance of this file, and distribution of its contents to remote	hosts.

       The X server also uses a	host-based access control  list	 for  deciding
       whether	or  not	 to  accept  connections  from clients on a particular
       machine.	 If no other authorization mechanism is	being used, this  list
       initially  consists  of the host	on which the server is running as well
       as any machines listed in the file /etc/Xn.hosts, where n is  the  dis-
       play number of the server.  Each	line of	the file should	contain	either
       an Internet hostname (e.g. or a  DECnet  hostname  in
       double  colon  format  (e.g.  hydra::) or a complete name in the	format
       family:name as described	in the xhost(1)	manual page.  There should  be
       no leading or trailing spaces on	any lines.  For	example:


       Users  can  add	or  remove  hosts from this list and enable or disable
       access control using the	xhost command from the	same  machine  as  the

       If  the	X  FireWall  Proxy  (xfwp) is being used without a sitepolicy,
       host-based authorization	must be	turned on for clients to  be  able  to
       connect to the X	server via the xfwp.  If xfwp is run without a config-
       uration file and	thus no	sitepolicy is defined, if xfwp is using	 an  X
       server  where xhost + has been run to turn off host-based authorization
       checks, when a client tries to connect to this X	server via xfwp, the X
       server  will  deny  the	connection.   See xfwp(1) for more information
       about this proxy.

       The X protocol intrinsically does not have any notion of	window	opera-
       tion  permissions or place any restrictions on what a client can	do; if
       a program can connect to	a display, it has full run of the  screen.   X
       servers that support the	SECURITY extension fare	better because clients
       can be designated untrusted via the authorization they use to  connect;
       see  the	xauth(1) manual	page for details.  Restrictions	are imposed on
       untrusted clients that curtail the mischief they	can do.	 See the SECU-
       RITY extension specification for	a complete list	of these restrictions.

       Sites that have better authentication and authorization	systems	 might
       wish  to	 make use of the hooks in the libraries	and the	server to pro-
       vide additional security	models.

       The X server attaches special meaning to	the following signals:

       SIGHUP  This signal causes the server to	 close	all  existing  connec-
	       tions,  free  all  resources,  and restore all defaults.	 It is
	       sent by the display  manager  whenever  the  main  user's  main
	       application (usually an xterm or	window manager)	exits to force
	       the server to clean up and prepare for the next user.

       SIGTERM This signal causes the server to	exit cleanly.

       SIGUSR1 This signal is used quite differently from either of the	above.
	       When  the  server  starts, it checks to see if it has inherited
	       SIGUSR1 as SIG_IGN instead of the usual SIG_DFL.	 In this case,
	       the  server  sends a SIGUSR1 to its parent process after	it has
	       set up the various connection schemes.  Xdm uses	 this  feature
	       to recognize when connecting to the server is possible.

       The  X  server  can  obtain  fonts  from	 directories  and/or from font
       servers.	 The list of directories and font servers the  X  server  uses
       when trying to open a font is controlled	by the font path.

       The    default	 font	 path	 is    /usr/local/lib/X11/fonts/misc/,
       /usr/local/lib/X11/fonts/TTF/,		 /usr/local/lib/X11/fonts/OTF,
       /usr/local/lib/X11/fonts/Type1/,	     /usr/local/lib/X11/fonts/100dpi/,
       /usr/local/lib/X11/fonts/75dpi/ .

       A special kind of directory can be specified using the catalogue:  pre-
       fix.  Directories  specified  this way can contain symlinks pointing to
       the real	font directories. See the FONTPATH.D section for details.

       The font	path can be set	with the -fp option or by  xset(1)  after  the
       server has started.

       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:


       /etc/Xn.hosts		     Initial  access  control list for display
				     number n

				     Bitmap font directories

				     Outline font directories

       /usr/local/share/X11/rgb.txt  Color database

       /tmp/.X11-unix/Xn	     Unix domain socket	for display number n

       /tmp/rcXn		     Kerberos 5	replay cache for display  num-
				     ber n

       /usr/adm/Xnmsgs		     Error  log	 file  for display number n if
				     run from init(8)

				     Default error log file if the  server  is
				     run from xdm(1)

       General information: X(7)

       Protocols:  X  Window  System  Protocol,	The X Font Service Protocol, X
       Display Manager Control Protocol

       Fonts: bdftopcf(1), mkfontdir(1), mkfontscale(1), xfs(1),  xlsfonts(1),
       xfontsel(1), xfd(1), X Logical Font Description Conventions

       Security:  Xsecurity(7),	 xauth(1),  Xau(1), xdm(1), xhost(1), xfwp(1),
       Security	Extension Specification

       Starting	the server: xdm(1), xinit(1)

       Controlling the server once started: xset(1), xsetroot(1), xhost(1)

       Server-specific man pages: Xorg(1), Xdmx(1), Xnest(1),  Xvfb(1),	 XDar-
       win(1), XWin(1).

       Server  internal	documentation: Definition of the Porting Layer for the
       X v11 Sample Server

       The sample server was originally	written	by Susan Angebranndt,  Raymond
       Drewry,	Philip Karlton,	and Todd Newman, from Digital Equipment	Corpo-
       ration, with support from a large cast.	It has since been  extensively
       rewritten  by  Keith Packard and	Bob Scheifler, from MIT.  Dave Wiggins
       took over post-R5 and made substantial improvements.

X Version 11		       xorg-server 1.6.0		    XSERVER(1)


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