sessreg - manage utmp/wtmp entries for non-init clients
sessreg [-w wtmp-file] [-u utmp-file] [-L
lastlog-file] [-l line-name] [-h host-name] [-s
slot-number] [-x Xservers-file] [-t ttys-file] [-V] [-a]
Sessreg is a simple program for managing utmp/wtmp and lastlog entries
for xdm sessions.
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 ignores them.
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
Keith Packard, MIT X Consortium
- -w wtmp-file
- This specifies an alternate wtmp file, instead of /var/log/wtmp.
The special name "none" disables writing records to the wtmp
- -u utmp-file
- This specifies an alternate utmp file, instead of /var/run/utmp.
The special name "none" disables writing records to the utmp
- -L lastlog-file
- This specifies an alternate lastlog file, instead of
/var/log/lastlog, if the platform supports lastlog files. The
special name "none" disables writing records to the lastlog
- -l line-name
- 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
- -h host-name
- This is set to indicate that the session was initiated from a remote host.
In typical xdm usage, this options is not used.
- -s slot-number
- 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.
- -x Xservers-file
- 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.
- -t ttys-file
- This specifies an alternate file which the -x option will use to
count the number of terminal sessions on a host.
- This option causes the command to print its version and exit.
- This session should be added to utmp/wtmp.
- This session should be deleted from utmp/wtmp. One of -a/-d must be