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dbus-daemon(1)		    General Commands Manual		dbus-daemon(1)

NAME
       dbus-daemon - Message bus daemon

SYNOPSIS
       dbus-daemon  dbus-daemon	 [--version] [--session] [--system] [--config-
       file=FILE]  [--print-address[=DESCRIPTOR]]   [--print-pid[=DESCRIPTOR]]
       [--fork]

DESCRIPTION
       dbus-daemon  is	the D-Bus message bus daemon. See http://www.freedesk-
       top.org/software/dbus/ for more information about the big  picture.  D-
       Bus  is	first a	library	that provides one-to-one communication between
       any two applications; dbus-daemon is an application that	uses this  li-
       brary  to  implement a message bus daemon. Multiple programs connect to
       the message bus daemon and can exchange messages	with one another.

       There are two standard message bus instances:  the  systemwide  message
       bus  (installed	on  many systems as the	"messagebus" init service) and
       the per-user-login-session message bus (started each time a  user  logs
       in).   dbus-daemon is used for both of these instances, but with	a dif-
       ferent configuration file.

       The  --session  option	is   equivalent	  to   "--config-file=/usr/lo-
       cal/etc/dbus-1/session.conf"  and  the --system option is equivalent to
       "--config-file=/usr/local/etc/dbus-1/system.conf".  By  creating	 addi-
       tional  configuration  files  and using the --config-file option, addi-
       tional special-purpose message bus daemons could	be created.

       The systemwide daemon is	normally launched by  an  init	script,	 stan-
       dardly called simply "messagebus".

       The  systemwide	daemon is largely used for broadcasting	system events,
       such as changes to the printer queue, or	adding/removing	devices.

       The per-session daemon is used for various  interprocess	 communication
       among  desktop applications (however, it	is not tied to X or the	GUI in
       any way).

       SIGHUP will cause the D-Bus daemon to PARTIALLY reload  its  configura-
       tion file and to	flush its user/group information caches. Some configu-
       ration changes would require kicking all	apps off the bus; so they will
       only  take effect if you	restart	the daemon. Policy changes should take
       effect with SIGHUP.

OPTIONS
       The following options are supported:

       --config-file=FILE
	      Use the given configuration file.

       --fork Force the	message	bus to fork and	become a daemon, even  if  the
	      configuration  file  does	 not  specify that it should.  In most
	      contexts the configuration file already gets this	right, though.
	      --nofork	Force the message bus not to fork and become a daemon,
	      even if the configuration	file specifies that it should.

       --print-address[=DESCRIPTOR]
	      Print the	address	of the message bus to standard output,	or  to
	      the  given file descriptor. This is used by programs that	launch
	      the message bus.

       --print-pid[=DESCRIPTOR]
	      Print the	process	ID of the message bus to standard  output,  or
	      to  the  given  file  descriptor.	 This is used by programs that
	      launch the message bus.

       --session
	      Use the standard configuration file  for	the  per-login-session
	      message bus.

       --system
	      Use  the	standard configuration file for	the systemwide message
	      bus.

       --version
	      Print the	version	of the daemon.

       --introspect
	      Print the	introspection information for all D-Bus	 internal  in-
	      terfaces.

       --address[=ADDRESS]
	      Set  the address to listen on. This option overrides the address
	      configured in the	configuration file.

       --systemd-activation
	      Enable systemd-style service activation. Only useful in conjunc-
	      tion with	the systemd system and session manager on Linux.

CONFIGURATION FILE
       A message bus daemon has	a configuration	file that specializes it for a
       particular application. For example, one	configuration file  might  set
       up  the message bus to be a systemwide message bus, while another might
       set it up to be a per-user-login-session	bus.

       The configuration file also establishes resource	limits,	 security  pa-
       rameters, and so	forth.

       The  configuration  file	is not part of any interoperability specifica-
       tion and	its backward compatibility is not guaranteed; this document is
       documentation, not specification.

       The  standard systemwide	and per-session	message	bus setups are config-
       ured in the  files  "/usr/local/etc/dbus-1/system.conf"	and  "/usr/lo-
       cal/etc/dbus-1/session.conf".  These files normally <include> a system-
       local.conf or session-local.conf; you can put local overrides in	 those
       files to	avoid modifying	the primary configuration files.

       The  configuration  file	is an XML document. It must have the following
       doctype declaration:

	  <!DOCTYPE busconfig PUBLIC "-//freedesktop//DTD D-Bus	Bus Configuration 1.0//EN"
	   "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">

       The following elements may be present in	the configuration file.

       _busconfig_

       Root element.

       _type_

       The well-known type of the message  bus.	 Currently  known  values  are
       "system"	 and "session";	if other values	are set, they should be	either
       added to	the D-Bus specification, or namespaced.	 The last <type>  ele-
       ment  "wins"  (previous values are ignored). This element only controls
       which message bus specific environment variables	are set	 in  activated
       clients.	  Most of the policy that distinguishes	a session bus from the
       system bus is controlled	from the other elements	in  the	 configuration
       file.

       If  the	well-known  type  of  the  message  bus	is "session", then the
       DBUS_STARTER_BUS_TYPE environment variable will be set to "session" and
       the  DBUS_SESSION_BUS_ADDRESS  environment  variable will be set	to the
       address of the session bus.  Likewise, if the type of the  message  bus
       is  "system",  then the DBUS_STARTER_BUS_TYPE environment variable will
       be set to "system" and the DBUS_SESSION_BUS_ADDRESS  environment	 vari-
       able  will  be  set to the address of the system	bus (which is normally
       well known anyway).

       Example:	<type>session</type>

       _include_

       Include a file <include>filename.conf</include> at this point.  If  the
       filename	 is relative, it is located relative to	the configuration file
       doing the including.

       <include> has an	optional attribute "ignore_missing=(yes|no)" which de-
       faults  to "no" if not provided.	This attribute controls	whether	it's a
       fatal error for the included file to be absent.

       _includedir_

       Include all files  in  <includedir>foo.d</includedir>  at  this	point.
       Files  in  the  directory  are included in undefined order.  Only files
       ending in ".conf" are included.

       This is intended	to allow extension of the  system  bus	by  particular
       packages.  For  example,	if CUPS	wants to be able to send out notifica-
       tion of printer queue changes, it could	install	 a  file  to  /usr/lo-
       cal/etc/dbus-1/system.d	that  allowed all apps to receive this message
       and allowed the printer daemon user to send it.

       _user_

       The user	account	the daemon should run as, as either a  username	 or  a
       UID.  If	the daemon cannot change to this UID on	startup, it will exit.
       If this element is not present, the daemon  will	 not  change  or  care
       about its UID.

       The last	<user> entry in	the file "wins", the others are	ignored.

       The  user  is  changed  after the bus has completed initialization.  So
       sockets etc. will be created before changing user, but no data will  be
       read from clients before	changing user. This means that sockets and PID
       files can be created in a location that requires	 root  privileges  for
       writing.

       _fork_

       If  present, the	bus daemon becomes a real daemon (forks	into the back-
       ground, etc.). This is generally	used rather than  the  --fork  command
       line option.

       _keep_umask_

       If present, the bus daemon keeps	its original umask when	forking.  This
       may be useful to	avoid affecting	the behavior of	child processes.

       _listen_

       Add an address that the bus should listen on. The  address  is  in  the
       standard	 D-Bus format that contains a transport	name plus possible pa-
       rameters/options.

       Example:	<listen>unix:path=/tmp/foo</listen>

       Example:	<listen>tcp:host=localhost,port=1234</listen>

       If there	are multiple <listen> elements,	then the bus listens on	multi-
       ple  addresses.	The  bus  will pass its	address	to started services or
       other interested	parties	with the last address given in <listen>	first.
       That is,	apps will try to connect to the	last <listen> address first.

       tcp sockets can accept IPv4 addresses, IPv6 addresses or	hostnames.  If
       a hostname resolves to multiple addresses, the server will bind to  all
       of them.	The family=ipv4	or family=ipv6 options can be used to force it
       to bind to a subset of addresses

       Example:	<listen>tcp:host=localhost,port=0,family=ipv4</listen>

       A special case is using a port number of	zero (or omitting  the	port),
       which  means to choose an available port	selected by the	operating sys-
       tem. The	port number chosen can be obtained  with  the  --print-address
       command	line  parameter	 and  will be present in other cases where the
       server reports its own address, such as	when  DBUS_SESSION_BUS_ADDRESS
       is set.

       Example:	<listen>tcp:host=localhost,port=0</listen>

       tcp  addresses  also  allow a bind=hostname option, which will override
       the host	option specifying what address to bind	to,  without  changing
       the  address  reported by the bus. The bind option can also take	a spe-
       cial name '*' to	cause the bus to listen	 on  all  local	 address  (IN-
       ADDR_ANY).  The	specified host should be a valid name of the local ma-
       chine or	weird stuff will happen.

       Example:	<listen>tcp:host=localhost,bind=*,port=0</listen>

       _auth_

       Lists permitted authorization mechanisms. If this element  doesn't  ex-
       ist,  then  all	known  mechanisms  are allowed.	 If there are multiple
       <auth> elements,	all the	listed mechanisms are allowed.	The  order  in
       which mechanisms	are listed is not meaningful.

       Example:	<auth>EXTERNAL</auth>

       Example:	<auth>DBUS_COOKIE_SHA1</auth>

       _servicedir_

       Adds  a	directory  to scan for .service	files. Directories are scanned
       starting	with the last to appear	in the config file (the	first .service
       file found that provides	a particular service will be used).

       Service	files tell the bus how to automatically	start a	program.  They
       are primarily used with the per-user-session bus,  not  the  systemwide
       bus.

       _standard_session_servicedirs/_

       <standard_session_servicedirs/> is equivalent to	specifying a series of
       <servicedir/> elements for each of the data  directories	 in  the  "XDG
       Base  Directory Specification" with the subdirectory "dbus-1/services",
       so for example "/usr/share/dbus-1/services" would be among the directo-
       ries searched.

       The "XDG	Base Directory Specification" can be found at http://freedesk-
       top.org/wiki/Standards/basedir-spec if it hasn't	moved,	otherwise  try
       your favorite search engine.

       The <standard_session_servicedirs/> option is only relevant to the per-
       user-session bus	daemon defined in  /usr/local/etc/dbus-1/session.conf.
       Putting it in any other configuration file would	probably be nonsense.

       _standard_system_servicedirs/_

       <standard_system_servicedirs/> specifies	the standard system-wide acti-
       vation directories that should be searched for service files.  This op-
       tion defaults to	/usr/local/share/dbus-1/system-services.

       The  <standard_system_servicedirs/> option is only relevant to the per-
       system bus daemon defined in /usr/local/etc/dbus-1/system.conf. Putting
       it in any other configuration file would	probably be nonsense.

       _servicehelper/_

       <servicehelper/>	 specifies  the	 setuid	 helper	that is	used to	launch
       system daemons with an alternate	user. Typically	 this  should  be  the
       dbus-daemon-launch-helper executable in located in libexec.

       The <servicehelper/> option is only relevant to the per-system bus dae-
       mon defined in /usr/local/etc/dbus-1/system.conf.  Putting  it  in  any
       other configuration file	would probably be nonsense.

       _limit_

       <limit> establishes a resource limit. For example:
	 <limit	name="max_message_size">64</limit>
	 <limit	name="max_completed_connections">512</limit>

       The name	attribute is mandatory.	 Available limit names are:
	     "max_incoming_bytes"	  : total size in bytes	of messages
					    incoming from a single connection
	     "max_incoming_unix_fds"	  : total number of unix fds of	messages
					    incoming from a single connection
	     "max_outgoing_bytes"	  : total size in bytes	of messages
					    queued up for a single connection
	     "max_outgoing_unix_fds"	  : total number of unix fds of	messages
					    queued up for a single connection
	     "max_message_size"		  : max	size of	a single message in
					    bytes
	     "max_message_unix_fds"	  : max	unix fds of a single message
	     "service_start_timeout"	  : milliseconds (thousandths) until
					    a started service has to connect
	     "auth_timeout"		  : milliseconds (thousandths) a
					    connection is given	to
					    authenticate
	     "max_completed_connections"  : max	number of authenticated	connections
	     "max_incomplete_connections" : max	number of unauthenticated
					    connections
	     "max_connections_per_user"	  : max	number of completed connections	from
					    the	same user
	     "max_pending_service_starts" : max	number of service launches in
					    progress at	the same time
	     "max_names_per_connection"	  : max	number of names	a single
					    connection can own
	     "max_match_rules_per_connection": max number of match rules for a single
					       connection
	     "max_replies_per_connection" : max	number of pending method
					    replies per	connection
					    (number of calls-in-progress)
	     "reply_timeout"		  : milliseconds (thousandths)
					    until a method call	times out

       The  max	incoming/outgoing queue	sizes allow a new message to be	queued
       if one byte remains below the max. So you can in	fact exceed the	max by
       max_message_size.

       max_completed_connections  divided  by  max_connections_per_user	is the
       number of users that can	work together to denial-of-service  all	 other
       users by	using up all connections on the	systemwide bus.

       Limits  are  normally  only  of interest	on the systemwide bus, not the
       user session buses.

       _policy_

       The <policy> element defines a security policy to be applied to a  par-
       ticular	set  of	connections to the bus.	A policy is made up of <allow>
       and <deny> elements. Policies are normally  used	 with  the  systemwide
       bus; they are analogous to a firewall in	that they allow	expected traf-
       fic and prevent unexpected traffic.

       Currently, the system bus has a default-deny policy for sending	method
       calls  and owning bus names.  Everything	else, in particular reply mes-
       sages, receive checks, and signals has a	default	allow policy.

       In general, it is best to keep system services as small,	targeted  pro-
       grams  which  run  in  their own	process	and provide a single bus name.
       Then, all that is needed	is an <allow> rule for the "own" permission to
       let  the	 process  claim	the bus	name, and a "send_destination" rule to
       allow traffic from some or all uids to your service.

       The <policy> element has	one of four attributes:
	 context="(default|mandatory)"
	 at_console="(true|false)"
	 user="username	or userid"
	 group="group name or gid"

       Policies	are applied to a connection as follows:
	  - all	context="default" policies are applied
	  - all	group="connection's user's group" policies are applied
	    in undefined order
	  - all	user="connection's auth	user" policies are applied
	    in undefined order
	  - all	at_console="true" policies are applied
	  - all	at_console="false" policies are	applied
	  - all	context="mandatory" policies are applied

       Policies	applied	later will override those applied  earlier,  when  the
       policies	 overlap.  Multiple  policies with the same user/group/context
       are applied in the order	they appear in the config file.

       _deny_ _allow_

       A <deny>	element	appears	below a	<policy> element  and  prohibits  some
       action.	The  <allow>  element  makes  an  exception to previous	<deny>
       statements, and works just like <deny> but with the inverse meaning.

       The possible attributes of these	elements are:
	  send_interface="interface_name"
	  send_member="method_or_signal_name"
	  send_error="error_name"
	  send_destination="name"
	  send_type="method_call" | "method_return" | "signal" | "error"
	  send_path="/path/name"

	  receive_interface="interface_name"
	  receive_member="method_or_signal_name"
	  receive_error="error_name"
	  receive_sender="name"
	  receive_type="method_call" | "method_return" | "signal" | "error"
	  receive_path="/path/name"

	  send_requested_reply="true" |	"false"
	  receive_requested_reply="true" | "false"

	  eavesdrop="true" | "false"

	  own="name"
	  user="username"
	  group="groupname"

       Examples:
	  <deny	send_destination="org.freedesktop.Service" send_interface="org.freedesktop.System" send_member="Reboot"/>
	  <deny	send_destination="org.freedesktop.System"/>
	  <deny	receive_sender="org.freedesktop.System"/>
	  <deny	user="john"/>
	  <deny	group="enemies"/>

       The <deny> element's attributes determine whether the deny "matches"  a
       particular  action.  If	it matches, the	action is denied (unless later
       rules in	the config file	allow it).

       send_destination	and receive_sender rules mean that messages may	not be
       sent  to	 or received from the *owner* of the given name, not that they
       may not be sent *to that	name*. That is,	if a connection	owns  services
       A,  B,  C,  and sending to A is denied, sending to B or C will not work
       either.

       The other send_*	and receive_* attributes are  purely  textual/by-value
       matches against the given field in the message header.

       "Eavesdropping"	occurs when an application receives a message that was
       explicitly addressed to a name the application does not own,  or	 is  a
       reply  to  such	a message. Eavesdropping thus only applies to messages
       that are	addressed to services and replies to such  messages  (i.e.  it
       does not	apply to signals).

       For <allow>, eavesdrop="true" indicates that the	rule matches even when
       eavesdropping. eavesdrop="false"	is the default and means that the rule
       only  allows  messages to go to their specified recipient.  For <deny>,
       eavesdrop="true"	indicates that the rule	matches	only  when  eavesdrop-
       ping.  eavesdrop="false"	 is  the  default for <deny> also, but here it
       means that the rule applies always, even	when  not  eavesdropping.  The
       eavesdrop  attribute  can  only be combined with	send and receive rules
       (with send_* and	receive_* attributes).

       The [send|receive]_requested_reply attribute  works  similarly  to  the
       eavesdrop  attribute. It	controls whether the <deny> or <allow> matches
       a reply that is expected	(corresponds to	a previous  method  call  mes-
       sage).	This attribute only makes sense	for reply messages (errors and
       method returns),	and is ignored for other message types.

       For <allow>, [send|receive]_requested_reply="true" is the  default  and
       indicates  that	only  requested	 replies  are  allowed	by  the	 rule.
       [send|receive]_requested_reply="false" means that the rule  allows  any
       reply even if unexpected.

       For  <deny>,  [send|receive]_requested_reply="false" is the default but
       indicates that the rule matches only when the reply was not  requested.
       [send|receive]_requested_reply="true"  indicates	 that the rule applies
       always, regardless of pending reply state.

       user and	group denials mean that	the given user or group	may  not  con-
       nect to the message bus.

       For  "name",  "username",  "groupname",	etc.  the character "*"	can be
       substituted, meaning "any." Complex globs like "foo.bar.*"  aren't  al-
       lowed  for  now because they'd be work to implement and maybe encourage
       sloppy security anyway.

       It does not make	sense to deny a	user or	group inside a <policy>	for  a
       user  or	group; user/group denials can only be inside context="default"
       or context="mandatory" policies.

       A single	<deny> rule may	specify	combinations  of  attributes  such  as
       send_destination	 and  send_interface  and send_type. In	this case, the
       denial applies only if both attributes match the	message	being  denied.
       e.g. <deny send_interface="foo.bar" send_destination="foo.blah"/> would
       deny messages with the given interface AND the given bus	name.  To  get
       an OR effect you	specify	multiple <deny>	rules.

       You  can't include both send_ and receive_ attributes on	the same rule,
       since "whether the message can be sent" and  "whether  it  can  be  re-
       ceived" are evaluated separately.

       Be careful with send_interface/receive_interface, because the interface
       field in	messages is optional.  In particular,  do  NOT	specify	 <deny
       send_interface="org.foo.Bar"/>!	 This will cause no-interface messages
       to be blocked for all services, which is	almost certainly not what  you
       intended.    Always   use   rules   of	the  form:  <deny  send_inter-
       face="org.foo.Bar" send_destination="org.foo.Service"/>

       _selinux_

       The <selinux> element contains settings related	to  Security  Enhanced
       Linux.  More details below.

       _associate_

       An <associate> element appears below an <selinux> element and creates a
       mapping.	Right now only one kind	of association is possible:
	  <associate own="org.freedesktop.Foobar" context="foo_t"/>

       This means that if a connection asks to	own  the  name	"org.freedesk-
       top.Foobar"  then the source context will be the	context	of the connec-
       tion and	the target context will	be "foo_t" - see the short  discussion
       of SELinux below.

       Note,  the  context  here is the	target context when requesting a name,
       NOT the context of the connection owning	the name.

       There's currently no way	to set a default for owning any	 name,	if  we
       add this	syntax it will look like:
	  <associate own="*" context="foo_t"/>
       If  you	find  a	reason this is useful, let the developers know.	 Right
       now the default will be the security context of the bus itself.

       If two <associate> elements specify the same name, the element  appear-
       ing later in the	configuration file will	be used.

SELinux
       See  http://www.nsa.gov/selinux/	for full details on SELinux. Some use-
       ful excerpts:

	       Every subject (process) and object (e.g.	file, socket, IPC  ob-
	       ject,  etc)  in the system is assigned a	collection of security
	       attributes, known as a security	context.  A  security  context
	       contains	 all of	the security attributes	associated with	a par-
	       ticular subject or object that are  relevant  to	 the  security
	       policy.

	       In order	to better encapsulate security contexts	and to provide
	       greater efficiency, the policy enforcement code of SELinux typ-
	       ically handles security identifiers (SIDs) rather than security
	       contexts. A SID is an integer that is mapped  by	 the  security
	       server to a security context at runtime.

	       When  a	security  decision is required,	the policy enforcement
	       code passes a pair of SIDs (typically the SID of	a subject  and
	       the SID of an object, but sometimes a pair of subject SIDs or a
	       pair of object SIDs), and an object security class to the secu-
	       rity  server.  The  object security class indicates the kind of
	       object, e.g. a process, a regular  file,	 a  directory,	a  TCP
	       socket, etc.

	       Access decisions	specify	whether	or not a permission is granted
	       for a given pair	of SIDs	and class. Each	object class has a set
	       of  associated permissions defined to control operations	on ob-
	       jects with that class.

       D-Bus performs SELinux security checks in two places.

       First, any time a message is routed from	one connection to another con-
       nection,	 the  bus daemon will check permissions	with the security con-
       text of the first connection as source, security	context	of the	second
       connection  as  target,	object	class  "dbus" and requested permission
       "send_msg".

       If a security context is	not available  for  a  connection  (impossible
       when  using  UNIX  domain sockets), then	the target context used	is the
       context of the bus daemon itself.  There	is currently no	way to	change
       this default, because we're assuming that only UNIX domain sockets will
       be used to connect to the systemwide bus. If this changes, we'll	proba-
       bly add a way to	set the	default	connection context.

       Second,	any  time a connection asks to own a name, the bus daemon will
       check permissions with  the  security  context  of  the	connection  as
       source,	the security context specified for the name in the config file
       as target, object class "dbus" and requested permission "acquire_svc".

       The security context for	a bus name is specified	with  the  <associate>
       element	described earlier in this document.  If	a name has no security
       context associated in the configuration file, the security  context  of
       the bus daemon itself will be used.

DEBUGGING
       If you're trying	to figure out where your messages are going or why you
       aren't getting messages,	there are several things you can try.

       Remember	that the system	bus is heavily locked down and if you  haven't
       installed  a  security  policy  file  to	allow your message through, it
       won't work. For the session bus,	this is	not a concern.

       The simplest way	to figure out what's happening on the bus  is  to  run
       the  dbus-monitor  program, which comes with the	D-Bus package. You can
       also send test messages with dbus-send. These programs have  their  own
       man pages.

       If you want to know what	the daemon itself is doing, you	might consider
       running a separate copy of the daemon to	test against. This will	 allow
       you  to put the daemon under a debugger,	or run it with verbose output,
       without messing up your real session and	system daemons.

       To run a	separate test copy of the daemon, for example you might	open a
       terminal	and type:
	 DBUS_VERBOSE=1	dbus-daemon --session --print-address

       The  test  daemon  address  will	be printed when	the daemon starts. You
       will need to copy-and-paste this	address	and use	it as the value	of the
       DBUS_SESSION_BUS_ADDRESS	 environment  variable when you	launch the ap-
       plications you want to test. This will cause those applications to con-
       nect  to	 your test bus instead of the DBUS_SESSION_BUS_ADDRESS of your
       real session bus.

       DBUS_VERBOSE=1 will have	NO EFFECT unless your copy of D-Bus  was  com-
       piled  with verbose mode	enabled. This is not recommended in production
       builds due to performance impact. You may need to rebuild D-Bus if your
       copy  was  not built with debugging in mind. (DBUS_VERBOSE also affects
       the D-Bus library and thus applications using D-Bus; it may  be	useful
       to see verbose output on	both the client	side and from the daemon.)

       If you want to get fancy, you can create	a custom bus configuration for
       your test bus (see the session.conf and system.conf files  that	define
       the  two	 default  configurations for example). This would allow	you to
       specify a different directory for .service files, for example.

AUTHOR
       See http://www.freedesktop.org/software/dbus/doc/AUTHORS

BUGS
       Please send bug reports to the D-Bus mailing list or bug	 tracker,  see
       http://www.freedesktop.org/software/dbus/

								dbus-daemon(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFIGURATION FILE | SELinux | DEBUGGING | AUTHOR | BUGS

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