TDE core libraries
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README.kded

Welcome to this readme about KDED.

KDED stands for KDE Daemon which isn't very descriptive.
KDED runs in the background and performs a number of small tasks.
Some of these tasks are built in, others are started on demand.

Built in tasks
==============
*) Checking for newly installed software and updating tdesycoca when new
software is detected. Updating of tdesycoca is done by the program tdebuildsycoca
which gets started by kded. When kded is first started it always runs
tdebuildsycoca to ensure that tdesycoca is up to date.

*) Checking for newly installed update files. Applications can install
*.upd update files. These *.upd files are used to update configuration files
of users, primarily when new versions of applications are installed with
(slightly) different configuration file formats. Updating of configuration
files is done by tdeconf_update. kded starts tdeconf_update when it detects a
new update file. When kded is first started it always runs tdeconf_update to
ensure that it has not missed any update files. tdeconf_update keeps track
of which update files have been processed already in the config-file
tdeconf_updaterc. It only performs a certain update once.

*) Checking for hostname changes. It is a really bad idea to change the
hostname of a running system and it usually only happens with incorrectly
configured dial-up connections. Never the less, kded will check for hostname
changes and if it detects one it will make the necassery changes to the
KDE environemnt and X-server to allow continued proper operation. The
program kdontchangethehostname is executed to make the actual changes.

Configuration of built in tasks.
================================
The built in tasks have some configuration options that can be changed by
editing the kdedrc configuration file. Changes need to be made with a text-
editor, there is no GUI available. All options are listed under the [General]
group:

HostnamePollInterval: This can be used to adjust the time interval at which
the hostname is checked for changes. The time is specified in milliseconds
and has a default of 5000 (5 seconds).

CheckSycoca: This option can be used to disable checking for new software.
tdesycoca will still be built when kded starts up and when applications
explicitly request a rebuild of the tdesycoca database. The user can
also manually rebuild tdesycoca by running the tdebuildsycoca program.
The default value of this option is "true". Checking can be disabled by
setting this option to "false".

CheckUpdates: This option can be used to disable checking for update files.
tdeconf_update will still be run when kded starts up.
The default value of this option is "true". Checking can be disabled by
setting this option to "false".

CheckHostname: This option can be used to disable checking for hostname
changes. The default value of this option is "true". Checking can be
disabled by setting this option to "false".

Example kdedrc file with default values:

[General]
HostnamePollInterval=5000
CheckSycoca=true
CheckUpdates=true
CheckHostname=true

If FAM or DNOTIFY is not available, the filesystem will be polled at regular interval for any changes. Under the [DirWatch] group in the kdeglobals file
the following options are available to adjust the polling frequency:

PollInterval: This can be used to adjust the time interval at which the local
filesystem is checked for new software or update files. The time is specified
in milliseconds and has a default of 500 (0.5 seconds).

NFSPollInterval: This can be used to adjust the time interval at which remote
filesystems, such as NFS or Samba, are ebing checked for new software or
update files. The time is specified in milliseconds and has a default of 5000
(5 seconds).

The above options are not used when FAM is used to watch for changes in the
filesystem, or when DNOTIFY is used. Specifying larger intervals may reduce
the CPU load and/or network traffic. Shorter intervals are not recommended.

Please note that in previous versions of KDE these options where listed in
the tderc file.

Example kdeglobals fragment:

[DirWatch]
PollInterval=500
NFSPollInterval=5000

Tasks loaded on demand
======================
Some things can be greatly simplified if they can be coordinated from a
central place. KDED has support for modules that will be demand-loaded
whenever an application attempts to make DCOP call to the module.
This can be useful for central administration tasks.

An example of a KDED module is the print module. When an application prints
a file, the print module will watch over the print-job while the file
is being printed. This allows you to close the application after submitting
your print-command to the printer, the print module will make sure to
inform the user when a print problem occurs (printer out of paper, printer
on fire)

A KDED module should install a .desktop file with
ServicesTypes=KDEDModule

A KDED module will be loaded on KDE startup if it has a line
X-TDE-Kded-autoload=true

Note that this flag doesn't cause the module to be loaded if the KDE desktop
is not running (i.e. when running a KDE application in another environment).

Normally KDED modules are loaded whenever they are accessed, so you don't
need autoloading enabled. On demand loading can be disabled by putting
the following line in the .desktop file:
X-TDE-Kded-load-on-demand=false

Further it should contain:
X-TDE-ModuleType=Library
X-TDE-Library=foo
X-TDE-FactoryName=foo

Which means that kded_foo.la is the name of the library that contains
the module and KDEDModule *create_foo(const QCString &) is the factory
function that should be called.

The .desktop file should be installed to ${kde_servicesdir}/kded