DBUS-MONITOR
Section: User Commands (1)
Updated: 10/08/2021
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NAME
dbu-monitor - debug probe to print message bus messages
SYNOPSIS
-
dbus-monitor [--system | --session | --address ADDRESS] [--profile | --monitor | --pcap | --binary] [watch expressions]
-
DESCRIPTION
The
dbus-monitor
command is used to monitor messages going through a D-Bus message bus. See
m[blue]http://www.freedesktop.org/software/dbus/m[]
for more information about the big picture.
There are two well-known message buses: the systemwide message bus (installed on many systems as the "messagebus" service) and the per-user-login-session message bus (started each time a user logs in). The --system and --session options direct
dbus-monitor
to monitor the system or session buses respectively. If neither is specified,
dbus-monitor
monitors the session bus.
dbus-monitor
has two different text output modes: the 'classic'-style monitoring mode, and profiling mode. The profiling format is a compact format with a single line per message and microsecond-resolution timing information. The --profile and --monitor options select the profiling and monitoring output format respectively.
dbus-monitor
also has two binary output modes. The binary mode, selected by
--binary, outputs the entire binary message stream (without the initial authentication handshake). The PCAP mode, selected by
--pcap, adds a PCAP file header to the beginning of the output, and prepends a PCAP message header to each message; this produces a binary file that can be read by, for instance, Wireshark.
If no mode is specified,
dbus-monitor
uses the monitoring output format.
In order to get
dbus-monitor
to see the messages you are interested in, you should specify a set of watch expressions as you would expect to be passed to the
dbus_bus_add_match
function.
The message bus configuration may keep
dbus-monitor
from seeing all messages, especially if you run the monitor as a non-root user.
OPTIONS
--system
-
Monitor the system message bus.
--session
-
Monitor the session message bus. (This is the default.)
--address ADDRESS
-
Monitor an arbitrary message bus given at ADDRESS.
--profile
-
Use the profiling output format.
--monitor
-
Use the monitoring output format. (This is the default.)
EXAMPLE
Here is an example of using dbus-monitor to watch for the gnome typing monitor to say things
-
dbus-monitor "type='signal',sender='org.gnome.TypingMonitor',interface='org.gnome.TypingMonitor'"
AUTHOR
dbus-monitor was written by Philip Blundell. The profiling output mode was added by Olli Salli.
BUGS
Please send bug reports to the D-Bus mailing list or bug tracker, see
m[blue]http://www.freedesktop.org/software/dbus/m[]
Index
- NAME
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- SYNOPSIS
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- DESCRIPTION
-
- OPTIONS
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- EXAMPLE
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- AUTHOR
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- BUGS
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