When the login server starts, one dtlogin
process is started. The dtlogin
process reads the Xconfig file
to determine the initial login server configuration and locate other
login server configuration files. The login server then reads the
Xservers file to see if it
has any displays to explicitly manage, and also reads the Xaccess
file to control access to the login server.
If the login server finds from the Xservers
file that it needs to manage a local display, it will start an X
server as instructed in the Xservers
file and then display a login screen on that display.
If the login server finds from the Xservers
file that it needs to manage a network display, it will assume an
X server is already running with the specified display name and
display a login screen on that display.
The login server will then wait for XDMCP requests from the
network.
For each display managed, the login server first creates a
new dtlogin process for that
display. This means if the login server is managing n
displays, there will be n+1
dtlogin processes. The login
server will run the Xsetup
script, load the Xresources
file, then run dtgreet to display
the login screen. Once the user has entered a username and password
and has been authenticated, the login server will run the Xstartup
script and then the Xsession
or Xfailsafe
script. When the user has exited the session, the login server will
run the Xreset script.
If the login server gets an XDMCP-indirect request, it will
run dtchooser to present a
list of login server hosts on the display. When the user selects
a host from the list, the login server on that host will manage
the display.
For the Xaccess, Xconfig,
Xfailsafe, Xreset,
language/Xresources,
Xservers, Xsetup,
and Xstartup configuration
files, the login server will by default look first in /etc/dt/config,
then /usr/dt/config, and
use the first file found.
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