On 2/19/25 09:41, Arsen Arsenović wrote:
they (gdm) are a user and they have a session.
Adding additional filtration can only confuse admins who compare 'who'
and other tools.
It is exactly that confusion that I'm trying to prevent.
The man page for "who" says "who - show who is logged on", but gdm is
not logged on.
The POSIX spec for "who" says that "who" optionally reports the login
time, but there is no login time here because nobody has logged in. The
POSIX spec also says that "who -l" should list only lines where the
system is waiting for someone to login - which is what's happening with
the gdm display - and yet who with libsystemd doesn't do that.
It's a stretch to say that gdm is a "user" in the sense that most people
understand "who". By default, "who" is supposed to list users who have
logged in, not random UIDs like daemon or systemd-resolve or gdm that
cannot log in.
