.TH INIT 8
.SH NAME
init \- grandparent of all processes
.SH DESCRIPTION
The first program started by Minix is
.BR init .
The actions performed by
.B init
can be summarized by this pseudo shell program:
.RS
.nf
.if t .ft C

# Reboot on SIGABRT (sent by the kernel on CRTL-ALT-DEL)
trap reboot 6

# Run the system initialization script.
sh /etc/rc </dev/console >/dev/console 2>&1

>/etc/utmp
echo reboot >>/usr/adm/wtmp

ttys=`cat /etc/ttys`

# Reread /etc/ttys on a hangup signal.
trap 'ttys=`cat /etc/ttys`' 1

# Stop everything on a terminate.
trap 'ttys=' 15

while :; do
	# Wait for a process to exit.
	wait

	# Record logout.
	for tty in $ttys
	do
		if exited $tty
		then
			echo "logout $tty" >>/etc/utmp
			echo "logout $tty" >>/usr/adm/wtmp
		fi
	done

	# Start a new session.
	for tty in $ttys
	do
		if idle $tty
		then
			stty ... <$tty
			getty <$tty >$tty 2>&1 &
		fi
	done
done

.if t .ft R
.fi
.RE
.B Init
naturally has process ID 1, so
.B kill \-1 1
should be used to make
.B init
reload the
.B /etc/ttys
file after it has been edited.
.PP
The utmp and wtmp handling is not a dumb as this of course, but you get the
picture.
.SH FILES
.TP 25n
.B /etc/ttys
List of terminals devices.
.TP
.B /etc/utmp
List of currently logged in users.
.TP
.B /usr/adm/wtmp
Login/logout history.
.SH "SEE ALSO"
.BR ttys (5),
.BR utmp (5),
.BR boot (8).
.SH AUTHOR
Kees J. Bot (kjb@cs.vu.nl)