I wanted a clock to appear on my xdm login screen, and to disappear
again when I logged in.

/etc/X11/xdm/{Xsetup,Xstartup} are conffiles, which makes it practical
to do this.  But I wanted something more general, so I modified them
to invoke scripts found in xsetup.d and xstartup.d directories.  The
patches are below.

The patches invoke the scripts with "setup" and "startup" arguments,
so that they know when they're being called, so that you can have a
single script be both setup and startup, and link it into both
directories.

Up to you if you use the patch, include a similar feature a different
way, or don't include the feature at all.

ttfn/rjk
--- Xsetup.orig	Fri Oct 26 23:28:45 2001
+++ Xsetup	Mon Oct 22 20:55:22 2001
@@ -22,6 +22,10 @@
   echo $! > $PIDFILE
 fi

+if [ -d /etc/X11/xdm/xsetup.d ]; then
+  run-parts --arg=setup /etc/X11/xdm/xsetup.d
+fi
+
 exit 0

 # vim:set ai et sts=2 sw=2 tw=0:
--- Xstartup.orig	Fri Oct 26 23:28:59 2001
+++ Xstartup	Mon Oct 22 20:58:27 2001
@@ -20,6 +20,10 @@
   fi
 fi

+if [ -d /etc/X11/xdm/xstartup.d ]; then
+  run-parts --arg=startup /etc/X11/xdm/xstartup.d
+fi
+
 # insert a utmp entry for the session
 if grep -qs ^use-sessreg /etc/X11/xdm/xdm.options && command -v sessreg > /dev/null 2>&1; then
   exec sessreg -a -l $DISPLAY -u /var/run/utmp -x /etc/X11/xdm/Xservers $USER

retitle 117242 xdm: support /etc/X11/xdm/{Xsetup.d,Xstartup.d}
thanks

The /etc/Xreset.d/ feature is implemented since version 1:1.1.9-1.
Removing it from the title of this bug.

Happy hacking,