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$ sudo lsof +E -a -U -p 1480
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1000/gvfs
 Output information may be incomplete.
lsof: WARNING: can't stat() fuse.gvfsd-fuse file system /run/user/1001/gvfs
 Output information may be incomplete.
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
Xorg 717 root 43u unix 0xffff975eacf2d400 0t0 30862 @/tmp/.X11-unix/X0 type=STREAM ->INO=28661 1480,lxtermina,3u
dbus-daem 980 t 34u unix 0xffff975eacf2fc00 0t0 30865 /run/user/1000/bus type=STREAM ->INO=28666 1480,lxtermina,9u
dbus-daem 1073 t 13u unix 0xffff975eacf2c400 0t0 28664 @/tmp/dbus-vtzJFcQ5Cy type=STREAM ->INO=28663 1480,lxtermina,5u
lxtermina 1480 t 3u unix 0xffff975eacf2c000 0t0 28661 type=STREAM ->INO=30862 717,Xorg,43u
lxtermina 1480 t 5u unix 0xffff975eacf2d000 0t0 28663 type=STREAM ->INO=28664 1073,dbus-daem,13u
lxtermina 1480 t 7u unix 0xffff975eacf2f000 0t0 28665 /run/user/1000/.lxterminal-socket- type=STREAM
lxtermina 1480 t 9u unix 0xffff975eacf2e800 0t0 28666 type=STREAM ->INO=30865 980,dbus-daem,34u

The lxterminal process communicates with Xorg process for GUI of lxterminal.

Then What is communication with dbus for? It's just a terminal emulator, why does it want to use dbus?

Thanks.

Note that there can be several DBus instances on your system:

• the system bus, that has its socket at /var/run/dbus/system_bus_socket or similar directory that is only writable by root. It is started at boot time.


• the user session bus that is started when you start a GUI desktop session and goes away when you log out.


• the accessibility bus, which originally used CORBA but has now been switched to more lightweight DBus. It supports various accessibility features of the desktop environment.

Since the dbus-daemon process is running on your own user account

The description of lxterminal at LXDE.org says:

LXTerminal supports multiple tabs. All instances of program share the same process to reduce memory usage.

I don't personally use LXTerminal, but this is probably the main reason for its use of DBus: when you attempt to start a new lxterminal window by clicking on a desktop icon or menu, the starting lxterminal process probably uses D-Bus to see if another instance of it is already running.

If there's already one LXTerminal process running, the new one can then simply send a "open a new window/tab with these options..." DBus message to the already-running process, and exit. The already-running LXTerminal process will then open a new window or set up a new tab according to its settings and/or options passed to it.