Dbus: Difference between revisions
From Leo's Notes
This page was last edited on 24 February 2017, at 04:19.
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== Watching For Messages / Events == | == Watching For Messages / Events == | ||
You can watch the dbus for messages using the {{code|dbus-monitor}} utility. A filter can be passed as an argument. For example, to limit only messages sent by the GNOME SessionManager: | You can watch the dbus for messages using the {{code|dbus-monitor}} utility. A filter can be passed as an argument. For example, to limit only messages sent by the GNOME SessionManager: | ||
{{highlight|lang= | {{highlight|lang=terminal|code= | ||
dbus-monitor "type=signal,sender='org.gnome.SessionManager'" | dbus-monitor "type=signal,sender='org.gnome.SessionManager'" | ||
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Eg: | Eg: | ||
{{highlight|lang= | {{highlight|lang=terminal|code= | ||
gdbus call --session --dest org.gnome.SessionManager \ | gdbus call --session --dest org.gnome.SessionManager \ | ||
--object-path /org/gnome/SessionManager/Presence \ | --object-path /org/gnome/SessionManager/Presence \ | ||
Revision as of 04:19, 24 February 2017
Dbus is a messaging system used in Linux display managers such as GNOME.
Accessing Dbus
Dbus is accessed using a socket whose location is defined as an environment variable named DBUS_SESSION_BUS_ADDRESS. Typically, it will look something like:
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-2L2ZxqLwNR,guid=9bf5b79ea33d45373491174856252e15
This environment variable must be defined in order for Dbus utilities to work properly.
Watching For Messages / Events
You can watch the dbus for messages using the dbus-monitor utility. A filter can be passed as an argument. For example, to limit only messages sent by the GNOME SessionManager:
dbus-monitor "type=signal,sender='org.gnome.SessionManager'"
Sending Messages
Messages can be sent using dbus call or dbus-send.
Eg:
gdbus call --session --dest org.gnome.SessionManager \
--object-path /org/gnome/SessionManager/Presence \
--method org.gnome.SessionManager.Presence.SetStatus 0
See Also
Gnome Presence Key
Gnome Screensaver (doesn't seem to work)