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authorJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
committerJacob McDonnell <jacob@jacobmcdonnell.com>2026-04-26 16:38:00 -0400
commit97d5c458cfa039d857301e1ca7d5af3beb37131d (patch)
treeb460cd850d0537eb71806ba30358840377b27688 /static/v10/man7/init.7
parentb89dc2331a50c63f8b33272a5c4c61ab98abdaa3 (diff)
build: Better Build System
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-.pa 1
-.he 'INIT (VII)'6/15/72'INIT (VII)'
-.ti 0
-NAME init -- process control initialization
-.sp
-.ti 0
-SYNOPSIS /etc/init
-.sp
-.ti 0
-DESCRIPTION
-.in 8
-init____
-is invoked inside UNIX as the last step in the boot procedure.
-Generally its role is to create a process for each
-typewriter on which a user may log in.
-
-First, init____ checks
-to see if the console switches contain 173030.
-(This number is likely to vary between
-systems.)
-If so, the console typewriter tty___ is opened for reading
-and writing and the shell is invoked immediately.
-This feature is used to bring up a test system, or one
-which does not contain DC-11 communications interfaces.
-When the system is brought up in this way, the getty_____
-and login_____ routines mentioned below and described elsewhere are not needed.
-
-Otherwise, init____ does some housekeeping: the mode of
-each DECtape file is changed to 17 (in case the system
-crashed during a tap___ command);
-directory /usr is mounted
-on the RK0 disk;
-directory /sys is mounted on the RK1 disk.
-Also a data-phone daemon
-is spawned to restart any jobs being sent.
-
-Then init____ forks several times to create a process
-for each typewriter mentioned in an internal table.
-Each of these processes opens the appropriate typewriter
-for reading and writing. These channels thus
-receive file descriptors 0 and 1, the standard input and
-output.
-Opening the typewriter will usually involve a delay,
-since the open____ is not completed until someone
-is dialled in (and carrier established) on the channel.
-Then the process executes the program /etc___/getty_____
-(q.v.).
-getty_____ will read the user's name and invoke login_____ (q.v.)
-to log in the user and execute the shell.
-
-Ultimately the shell will terminate
-because of an end-of-file either
-typed explicitly or generated as a result of hanging up.
-The main path of init____, which has been waiting
-for such an event,
-wakes up and removes the appropriate entry from the
-file utmp____, which records current users, and
-makes an entry in wtmp____, which maintains a history
-of logins and logouts.
-Then the appropriate typewriter is reopened and getty_____
-reinvoked.
-.sp
-.in 16
-.ti 0
-FILES /dev/tap?,
-/dev/tty, /dev/tty?, /tmp/utmp, /tmp/wtmp
-.sp
-.ti 0
-SEE ALSO login(I), login(VII), getty(VII), sh(I), dpd(VII)
-.sp
-.ti 0
-DIAGNOSTICS none possible
-.sp
-.ti 0
-BUGS none possible