termsetup

<B>Digital的Unix操作系统VAX 4.2源码</B>

#!/bin/sh5
########################################################################
#
#			Copyright (c) 1988, 1989 by
#		Digital Equipment Corporation, Maynard, MA
#			All rights reserved.
#
#	This software is furnished under a license and may be used and
#	copied  only  in accordance with the terms of such license and
#	with the  inclusion  of  the  above  copyright  notice.   This
#	software  or  any  other copies thereof may not be provided or
#	otherwise made available to any other person.  No title to and
#	ownership of the software is hereby transferred.		
#
#	The information in this software is subject to change  without
#	notice  and should not be construed as a commitment by Digital
#	Equipment Corporation.					
#
#	Digital assumes no responsibility for the use  or  reliability
#	of its software on equipment which is not supplied by Digital.
#
#	SCCSID = "@(#)termsetup	4.2	(ULTRIX)	8/5/90"
#
#	000	Jonathan Wallace	1-Jun-1990
#
#
#	001	James C. Overman	05-Aug-1990
#	    Moved references to /tmp to /usr/tmp 
#	    
########################################################################
#
#
#############################################
# Set variables, constants, and environment #
#############################################
set -h
trap 'Original_State_Routine; exit 1' 1 2 3 18
LL="
"
SWITCH=$1
TTY=$2
TTD=`expr $TTY : '.*\([0-9]\)'`
TTD=ttyd$TTD
MVFLG=0
ED_ERROR="
Errors occured  while  attempting to edit the terminal initialization
file /etc/ttys during this procedure.   A temporary error file called
/usr/tmp/ed_errs is created to trap any errors that might occur while
attempting  to  add  a  terminal  device using this procedure.  Check
/usr/tmp/ed_errs to determine the nature of the error, and then check
/etc/ttys  to see if a valid entry was made for tty00.  Refer to  the
Guide to System Environment Setup  for  more  information  about  the
terminal  initialization file /etc/ttys, it's format, and description
of it's entries; or contact your system administrator."

###################
# SH5 Subroutines #
###################
#############################################################
#
: Error_Routine - error handler from tty_stat program
#
# Return Codes	Meaning
#	0	Success
#	1	Generic Failure 
#	2	Undefined
#	3	grep failed to find tty in /etc/ttys
#	4	tty specified more than once in /etc/ttys
#	5	specified tty is already turned on in /etc/ttys
#
#############################################################
Error_Routine()
{
	case $1 in
	3 )
		clear
		echo "
$PROCEDURE_NAME

Line $TTY does not exist in /etc/ttys file.  Check the file for
corruption by refering to the Guide to System Environment Setup,
Terminal Initialization File section.  

Press <RETURN> to continue: \c"
		read resp
		return 1
		;;
	4 )
		clear
		echo "
$PROCEDURE_NAME

$TTY is defined more than once in the /etc/ttys file.
_______________________________________________________________________________"
		cat /usr/tmp/tty_lines
		echo "_______________________________________________________________________________

This causes unpredictable results and is unsupported by this
procedure.  You may want to take corrective action by manually
editing the Terminal Initialization File /etc/ttys refering to
the Guide to System Environment Setup, Terminal Initialization
File section, for information about it's format, and description
of it's entries; or contact your system administrator.

Press <RETURN> to continue: \c"
		read resp
		return 1
		;;
	5 )
		TTY_ERROR=`cat /usr/tmp/tty_stat`
		while :
		do
			clear
			echo "
$PROCEDURE_NAME

Line $TTY has already been activated for the following use:

	$TTY - $TTY_ERROR

If you want to override the current $TTY entry in /etc/ttys
and create a new terminal line on $TTY anyway, type 'y' to the
confirmation request below. 

Do you want to override the current $TTY entry? (y/n) [n]: \c"
			read resp
			case $resp in
			[Nn]* | "" )
				return 1
				;;
			[Yy]* )
				return 0
				;;
			* )
				;;
			esac
		done
		;;
	* )
		clear
		echo "
$PROCEDURE_NAME

Line $TTY is in an unknown state.  Check the entries of line $TTY
in /etc/ttys by refering to the Guide to System Environment Setup,
Terminal Initialization File section.

Press <RETURN> to continue: \c"
		read resp
		return 1
		;;
	esac

}


###########################################################
: Term_Type_Routine - User selects type of terminal to add
###########################################################
Term_Type_Routine()
{
	while :
	do
		clear
		echo "
$PROCEDURE_NAME

Select one of the DIGITAL terminal types below:

	1 - VT100 series
	2 - VT200 series
	3 - VT300 series

	0 - None of the above

Enter your choice [2]: \c"
		read resp
		case $resp in
		0 )
			exit 0
			;;
		1 )
			VTTYPE=vt100
			break
			;;
		"" | 2 )
			VTTYPE=vt200
			break
			;;
		3 )
			VTTYPE=vt300
			break
			;;
		* )
			;;
		esac
	done
}


#################################################
: Terminal_On_Routine - Turn on terminal in ttys
#################################################
Terminal_On_Routine()
{
	clear
	echo "
$PROCEDURE_NAME

Creating terminal line on $TTY.....\c"

	ed - /etc/ttys <<xxEOFxx >/usr/tmp/ed_errs
	/^$TTY/d
	i
$TTY	"/etc/getty std.9600"	$VTTYPE	on nomodem secure	#direct connect tty
.
	w
	q
xxEOFxx

	if [ -s /usr/tmp/ed_errs ]
	then
		echo "Error creating terminal line! $ED_ERROR"
		Original_State_Routine
	else
		kill -1 1
		echo "done."
	fi

	echo "${LL}Press <RETURN> to continue: \c"
	read resp
}


###################################################
: Terminal_Off_Routine - Turn off terminal in ttys
###################################################
Terminal_Off_Routine()
{
	clear
	echo "
$PROCEDURE_NAME

Removing terminal line on $TTY.....\c"

	ed - /etc/ttys <<xxEOFxx >/usr/tmp/ed_errs
	/^$TTY/d
	i
$TTY	"/etc/getty std.9600"	vt100	off nomodem	#direct connect tty
.
	w
	q
xxEOFxx

	if [ -s /usr/tmp/ed_errs ]
	then
		echo "Error removing terminal line! $ED_ERROR"
	else
		kill -1 1
		echo "done."
	fi

	echo "${LL}Press <RETURN> to continue: \c"
	read resp
}


##########################################################
: File_Check_Routine - Make sure proper files are around.
##########################################################
File_Check_Routine()
{
	if [ ! -c /dev/$TTY ]
	then
		if [ ! -c /dev/$TTD ]
		then
			clear
			echo "
$PROCEDURE_NAME

A file consistency check was unable to locate the file '/dev/$TTY'
which is required in order to set up or use terminals on this machine.  

Check the '/dev' directory to verify whether '/dev/$TTY' actually
exists.  If it does not, refer to the MAKEDEV(8) manpage, or contact
your system administrator.

Press <RETURN> to continue: \c"
			read resp
			exit 1
		else
			MVFLG=1
			mv /dev/$TTD /dev/$TTY
			chmod 640 /dev/$TTY
		fi
	fi
}


###############################################################
: Original_State_Routine - Return /dev files to previous state
###############################################################
Original_State_Routine()
{
	case $MVFLG in
	1 )
		mv /dev/$TTY /dev/$TTD 2>/dev/null
		chmod 666 /dev/$TTD 2>/dev/null
		MVFLG=0
		;;
	esac
}


###########################################################
# MAIN PROGRAM PROCEDURE ROUTINE #
##################################
while :
do
	case $SWITCH in
	-A )
		PROCEDURE_NAME="*** Terminal Line Creation Procedure ***"
		tty_scan $TTY
		case $? in
		0 )
			;;
		* )
			Error_Routine $?
			case $? in
			1 )
				exit 1
				;;
			esac
			;;
		esac
		Term_Type_Routine
		File_Check_Routine
		Terminal_On_Routine
		break
		;;
	-R )
		PROCEDURE_NAME="*** Terminal Line Removal Procedure ***"
		tty_scan $TTY
		case $? in
		0 | 5 )
			;;
		* )
			Error_Routine $?
			case $? in
			1 )
				exit 1
				;;
			esac
			;;
		esac
		Terminal_Off_Routine
		break
		;;
	esac
done

exit 0