Provided by: x11-xserver-utils_7.3+2_i386
sessreg - manage utmp/wtmp entries for non-init clients
sessreg [-w wtmp-file] [-u utmp-file] [-l line-name] [-h host-name] [-s
slot-number] [-x Xservers-file] [-t ttys-file] [-a] [-d] user-name
Sessreg is a simple program for managing utmp/wtmp entries for xdm
System V has a better interface to utmp than BSD; it dynamically
allocates entries in the file, instead of writing them at fixed
positions indexed by position in /etc/ttys.
To manage BSD-style utmp files, sessreg has two strategies. In
conjunction with xdm, the -x option counts the number of lines in
/etc/ttys and then adds to that the number of the line in the Xservers
file which specifies the display. The display name must be specified
as the "line-name" using the -l option. This sum is used as the "slot-
number" in the utmp file that this entry will be written at. In the
more general case, the -s option specifies the slot-number directly.
If for some strange reason your system uses a file other than /etc/ttys
to manage init, the -t option can direct sessreg to look elsewhere for
a count of terminal sessions.
Conversely, System V managers will not ever need to use these options
(-x, -s and -t). To make the program easier to document and explain,
sessreg accepts the BSD-specific flags in the System V environment and
BSD and Linux also have a host-name field in the utmp file which
doesn’t exist in System V. This option is also ignored by the System V
version of sessreg.
In Xstartup, place a call like:
sessreg -a -l $DISPLAY -x /etc/X11/xdm/Xservers $USER
and in Xreset:
sessreg -d -l $DISPLAY -x /etc/X11/xdm/Xservers $USER
This specifies an alternate wtmp file, instead of /var/log/wtmp.
The special name "none" disables writing records to the wtmp
This specifies an alternate utmp file, instead of /var/run/utmp.
The special name "none" disables writing records to the utmp
This describes the "line" name of the entry. For terminal
sessions, this is the final pathname segment of the terminal
device filename (e.g. ttyd0). For X sessions, it should
probably be the local display name given to the users session
(e.g. :0). If none is specified, the terminal name will be
determined with ttyname(3) and stripped of leading components.
This is set for BSD hosts to indicate that the session was
initiated from a remote host. In typical xdm usage, this
options is not used.
Each potential session has a unique slot number in BSD systems,
most are identified by the position of the line-name in the
/etc/ttysfile. This option overrides the default position
determined with ttyslot(3). This option is inappropriate for
use with xdm, the -x option is more useful.
As X sessions are one-per-display, and each display is entered
in this file, this options sets the slot-number to be the number
of lines in the ttys-file plus the index into this file that the
line-name is found.
This specifies an alternate file which the -x option will use to
count the number of terminal sessions on a host.
-a This session should be added to utmp/wtmp.
-d This session should be deleted from utmp/wtmp. One of -a/-d
must be specified.
Keith Packard, MIT X Consortium