Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Posting-Version: version B 2.10.2 9/18/84; site codas.UUCP
Path: utzoo!watmath!clyde!bonnie!akgua!akguc!codas!mikel
From: mikel@codas.UUCP (Mikel Manitius)
Newsgroups: net.sources
Subject: Termnial Locking Programs
Message-ID: <146@codas.UUCP>
Date: Sat, 5-Oct-85 17:36:43 EDT
Article-I.D.: codas.146
Posted: Sat Oct  5 17:36:43 1985
Date-Received: Mon, 7-Oct-85 03:58:55 EDT
Distribution: net
Organization: AT&T Information Systems (SDSS) - Orlando
Lines: 79

Since everyone seems to want a terminal locking program, I have decided
to post one I threw together a while ago, Note that it has a five minute
timeout, at which point it will log out out, if invoked from the login
shell, or just leave your terminal unprotected if invoked from a process
stack. Note that one could add a few lines of kode to make it stty the
input/output speed to 0, which would cause the line to drop, unless you
have a DH controller.

The five minute timeout is good enough to let you run to the candy machine,
get a print out, or some releif in a busy computer center.

----------begin lock.c----------
char	*sccsid = "@(#)lock.c  Mikel Manitius  1.0  85-10-05";
#include <stdio.h>
#include <signal.h>
#include <time.h>

#define		TIMEOUT			5*60

/*
 * lock - lock terminal until knowlegable joe returns.
 *
 * Mikel Manitius - 85-10-05 - AT&T Information Systems.
 *
 * UUCP: ...{ihnp4!akguc}!codas!mikel
 *       ...attmail!mmanitius
 */

char	*getpass();

timeout()
{
	int	now;
	struct	tm *tm;
	struct	tm *localtime();

	time(&now);
	tm = localtime(&now);
	printf("\7* Lock has timed out at %d:%02d:%02d\n",
		tm->tm_hour, tm->tm_min, tm->tm_sec);
	kill(getppid(), SIGKILL);
	exit(1);
}

main()
{
	int	n;
	char	pass[14];
	char	*try;

	alarm(TIMEOUT);
	alarm(TIMEOUT);
	signal(SIGALRM, timeout);
	strcpy(pass, getpass("Key:"));
	printf("* Terminal locked until knowlegable joe returns.\n");
	signal(SIGTERM, SIG_IGN);
	signal(SIGQUIT, SIG_IGN);
	signal(SIGINT, SIG_IGN);
	signal(SIGHUP, SIG_IGN);
	for(n=0;;n++) {
		try = getpass("Key:");
		if(!strcmp(try, pass))
			break;
		else
			printf("No dice pal.\n");
		}
	if(n > 0)
		printf("attempts: %d\n", n);
}
-----------end lock.c-----------

Enjoy.
-- 
                                        =======
     Mikel Manitius                   ==----=====    AT&T
     (305) 869-2462 RNX: 755         ==------=====   Information Systems 
     ...{akguc|ihnp4}!codas!mikel    ===----======   SDSS Regional Support
     ...attmail!mmanitius             ===========    Altamonte Springs, FL
     My opinions are my own.            =======