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Annotation of researchv10dc/dist/man/v4/man7/init.7, revision 1.1

1.1     ! root        1: .th INIT VII 6/15/72
        !             2: .sh NAME
        !             3: init  \*-  process control initialization
        !             4: .sh SYNOPSIS
        !             5: .bd /etc/init
        !             6: .sh DESCRIPTION
        !             7: .it Init
        !             8: is invoked inside UNIX as the last step in the boot procedure.
        !             9: Generally its role is to create a process for each
        !            10: typewriter on which a user may log in.
        !            11: .s3
        !            12: First,
        !            13: .it init
        !            14: checks
        !            15: to see if the console switches contain 173030.
        !            16: (This number is likely to vary between
        !            17: systems.)
        !            18: If so, the console typewriter \fItty\fR is opened for reading
        !            19: and writing and the shell is invoked immediately.
        !            20: This feature is used to bring up a single-user system.
        !            21: When the system is brought up in this way, the
        !            22: .it getty
        !            23: and
        !            24: .it login
        !            25: routines mentioned below and described elsewhere are not needed.
        !            26: .s3
        !            27: Otherwise, \fIinit\fR
        !            28: invokes a Shell, with input taken from the
        !            29: file
        !            30: .it /etc/rc.
        !            31: This command file
        !            32: performs housekeeping
        !            33: like removing temporary files,
        !            34: mounting file systems, and starting the data-phone
        !            35: daemon.
        !            36: .s3
        !            37: Then
        !            38: .it init
        !            39: forks several times to create a process
        !            40: for each typewriter mentioned in an internal table.
        !            41: Each of these processes opens the appropriate typewriter
        !            42: for reading and writing.  These channels thus
        !            43: receive file descriptors 0 and 1, the standard input and
        !            44: output.
        !            45: Opening the typewriter will usually involve a delay,
        !            46: since the \fIopen\fR is not completed until someone
        !            47: is dialled up and carrier established on the channel.
        !            48: Then the process executes the program
        !            49: .it /etc/getty
        !            50: (q.v.).
        !            51: .it Getty
        !            52: will read the user's name and invoke
        !            53: .it login
        !            54: (q.v.)
        !            55: to log in the user and execute the shell.
        !            56: .s3
        !            57: Ultimately the shell will terminate
        !            58: because of an end-of-file either
        !            59: typed explicitly or generated as a result of hanging up.
        !            60: The main path of \fIinit\fR, which has been waiting
        !            61: for such an event,
        !            62: wakes up and removes the appropriate entry from the
        !            63: file \fIutmp\fR, which records current users, and
        !            64: makes an entry in \fIwtmp\fR, which maintains a history
        !            65: of logins and logouts.
        !            66: Then the appropriate typewriter is reopened and
        !            67: .it getty
        !            68: is
        !            69: reinvoked.
        !            70: .sh FILES
        !            71: /dev/tty, /dev/tty?, /tmp/utmp, /tmp/wtmp,
        !            72: .sh "SEE ALSO"
        !            73: login(I), getty(VII), sh(I)

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