DCONF-SERVICE(1) User Commands DCONF-SERVICE(1)NAME
dconf-service - D-Bus service for writes to the dconf database
SYNOPSIS
dconf-service
DESCRIPTION
The dconf-service program provides the ca.desrt.dconf name on the session or system bus. Users or administrators should never need to start
the service, as it will be automatically started by dbus-daemon(1) whenever an application tries to write settings.
Reading values from the dconf database does not involve the service; it is only needed for writes. The service is stateless and can exit
freely at any time (and is therefore robust against crashes).
SEE ALSO dconf(7), dbus-daemon(1), systemd(1)dconfDCONF-SERVICE(1)
Check Out this Related Man Page
DCONF(7) Conventions and miscellaneous DCONF(7)NAME
dconf - A configuration systen
DESCRIPTION
dconf is a simple key/value storage system that is heavily optimised for reading. This makes it an ideal system for storing user
preferences (which are read 1000s of times for each time the user changes one). It was created with this usecase in mind.
All preferences are stored in a single large binary file. Layering of preferences is possible using multiple files (ie: for site defaults).
Lock-down is also supported. The binary file for the defaults can optionally be compiled from a set of plain text keyfiles.
dconf has a partial client/server architecture. It uses D-Bus. The server is only involved in writes (and is not activated in the user
session until the user modifies a preference). The service is stateless and can exit freely at any time (and is therefore robust against
crashes). The list of paths that each process is watching is stored within the D-Bus daemon itself (as D-Bus signal match rules).
Reads are performed by direct access (via mmap) to the on-disk database which is essentially a hashtable. For this reason, dconf reads
typically involve zero system calls and are comparable to a hashtable lookup in terms of speed. Practically speaking, in simple non-layered
setups, dconf is less than 10 times slower than GHashTable.
Writes are assumed only to happen in response to explicit user interaction (like clicking on a checkbox in a preferences dialog) and are
therefore not optimised at all. On some file systems, dconf-service will call fsync() for every write, which can introduce a latency of up
to 100ms. This latency is hidden by the client libraries through a clever "fast" mechanism that records the outstanding changes locally (so
they can be read back immediately) until the service signals that a write has completed.
PORTABILITY
dconf mostly targets Free Software operating systems. It will theoretically run on Mac OS but there isn't much point to that (since Mac OS
applications want to store preferences in plist files). It is not possible to use dconf on Windows because of the inability to rename over
a file that's still in use (which is what the dconf-service does on every write).
API STABILITY
The dconf API is not particularly friendly, and is not guaranteed to be stable. Because of this and the lack of portability, you almost
certainly want to use some sort of wrapper API around it. The wrapper API used by GTK+ and GNOME applications is GSettings[1], which is
included as part of GLib. GSettings has backends for Windows (using the registry) and Mac OS (using property lists) as well as its dconf
backend and is the proper API to use for graphical applications.
SEE ALSO dconf-service(1), dconf-editor(1), dconf(1), GSettings[1]
NOTES
1. GSettings
http://developer.gnome.org/gio/stable/GSettings.html
dconfDCONF(7)
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