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Diffstat (limited to 'static/v10/man7/init.7')
| -rw-r--r-- | static/v10/man7/init.7 | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/static/v10/man7/init.7 b/static/v10/man7/init.7 new file mode 100644 index 00000000..70c6f221 --- /dev/null +++ b/static/v10/man7/init.7 @@ -0,0 +1,75 @@ +.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 |