man pages section 1: User Commands

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Updated: July 2014

sessreg (1)


sessreg - init clients


/usr/bin/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] [-d] user-name


User Commands                                          SESSREG(1)

     sessreg - manage utmp/wtmp entries for non-init clients

     /usr/bin/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] [-d] user-name

     Sessreg is a simple program for managing utmp/wtmp and last-
     log entries for xdm sessions.

     System V has a better interface to utmp than BSD; it dynami-
     cally 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

     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

     -w wtmp-file
          This specifies  an  alternate  wtmp  file,  instead  of
          /var/adm/wtmpx.  The special name "none" disables writ-
          ing records to the wtmp file.

X Version 11        Last change: sessreg 1.0.8                  1

User Commands                                          SESSREG(1)

     -u utmp-file
          This specifies an alternate utmp file, instead of /sys-
          tem/volatile/utmpx.   The  special name "none" disables
          writing records to the utmp file.

     -L lastlog-file
          This specifies an alternate lastlog  file,  instead  of
          /var/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 ter-
          minal sessions, this is the final pathname  segment  of
          the  terminal device filename (e.g. ttyd0).  For X ses-
          sions, it should probably be  the  local  display  name
          given to the users session (e.g. :0).  If none is spec-
          ified, the terminal name will be determined  with  tty-
          name(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

     -V   This option causes the command to print its version and

     -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.

X Version 11        Last change: sessreg 1.0.8                  2

User Commands                                          SESSREG(1)

     xdm(1), utmpx(4)

     Keith Packard, MIT X Consortium

     See   attributes(5)   for   descriptions  of  the  following

     |      ATTRIBUTE TYPE         |      ATTRIBUTE VALUE        |
     |Availability                 |x11/session/sessreg          |
     |Interface Stability          |Committed                    |

X Version 11        Last change: sessreg 1.0.8                  3