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sessreg - manage utmp/wtmp entries for non-init
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] [-a] [-d] user-name
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
Packard, MIT X Consortium
- -w wtmp-file
- This specifies an alternate wtmp file, instead of /var/adm/wtmpx.
The special name "none" disables writing records to the wtmp file.
- -u utmp-file
specifies an alternate utmp file, instead of /var/adm/utmpx. The special
name "none" disables writing records to the utmp file.
- -L lastlog-file
specifies an alternate lastlog file, instead of /usr/adm/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)
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
. 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 session should be added to utmp/wtmp.
- This session should be deleted
from utmp/wtmp. One of -a/-d must be specified.
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