Section: User Commands (1)
Updated: sessreg 1.0.8
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.
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
- -w wtmp-file
- This specifies an alternate wtmp file, instead of /var/log/wtmp. The special name "none" disables writing records to the wtmp file.:
- -u utmp-file
- This specifies an alternate utmp file, instead of /var/run/utmp. The special name "none" disables writing records to the utmp file.:
- -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 file.:
- -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 leading components.:
- -h host-name
- 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.:
- -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 specified.:
Keith Packard, MIT X Consortium