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Annotation of researchv10dc/dist/man/v3/man7/init.7, revision 1.1.1.1

1.1       root        1: .pa 1
                      2: .he 'INIT (VII)'6/15/72'INIT (VII)'
                      3: .ti 0
                      4: NAME           init  --  process control initialization
                      5: .sp
                      6: .ti 0
                      7: SYNOPSIS       /etc/init
                      8: .sp
                      9: .ti 0
                     10: DESCRIPTION
                     11: .in 8
                     12: init____
                     13: is invoked inside UNIX as the last step in the boot procedure.
                     14: Generally its role is to create a process for each
                     15: typewriter on which a user may log in.
                     16: 
                     17: First, init____ checks
                     18: to see if the console switches contain 173030.
                     19: (This number is likely to vary between
                     20: systems.)
                     21: If so, the console typewriter tty___ is opened for reading
                     22: and writing and the shell is invoked immediately.
                     23: This feature is used to bring up a test system, or one
                     24: which does not contain DC-11 communications interfaces.
                     25: When the system is brought up in this way, the getty_____
                     26: and login_____ routines mentioned below and described elsewhere are not needed.
                     27: 
                     28: Otherwise, init____ does some housekeeping: the mode of
                     29: each DECtape file is changed to 17 (in case the system
                     30: crashed during a tap___ command);
                     31: directory /usr is mounted
                     32: on the RK0 disk;
                     33: directory /sys is mounted on the RK1 disk.
                     34: Also a data-phone daemon
                     35: is spawned to restart any jobs being sent.
                     36: 
                     37: Then init____ forks several times to create a process
                     38: for each typewriter mentioned in an internal table.
                     39: Each of these processes opens the appropriate typewriter
                     40: for reading and writing.  These channels thus
                     41: receive file descriptors 0 and 1, the standard input and
                     42: output.
                     43: Opening the typewriter will usually involve a delay,
                     44: since the open____ is not completed until someone
                     45: is dialled in (and carrier established) on the channel.
                     46: Then the process executes the program /etc___/getty_____
                     47: (q.v.).
                     48: getty_____ will read the user's name and invoke login_____ (q.v.)
                     49: to log in the user and execute the shell.
                     50: 
                     51: Ultimately the shell will terminate
                     52: because of an end-of-file either
                     53: typed explicitly or generated as a result of hanging up.
                     54: The main path of init____, which has been waiting
                     55: for such an event,
                     56: wakes up and removes the appropriate entry from the
                     57: file utmp____, which records current users, and
                     58: makes an entry in wtmp____, which maintains a history
                     59: of logins and logouts.
                     60: Then the appropriate typewriter is reopened and getty_____
                     61: reinvoked.
                     62: .sp
                     63: .in 16
                     64: .ti 0
                     65: FILES          /dev/tap?,
                     66: /dev/tty, /dev/tty?, /tmp/utmp, /tmp/wtmp
                     67: .sp
                     68: .ti 0
                     69: SEE ALSO       login(I), login(VII), getty(VII), sh(I), dpd(VII)
                     70: .sp
                     71: .ti 0
                     72: DIAGNOSTICS    none possible
                     73: .sp
                     74: .ti 0
                     75: BUGS           none possible

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