4.1cBSD/usr/src/ucb/lock.c

static char *sccsid = "@(#)lock.c	4.2 (Berkeley) 2/11/82";
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <signal.h>
#include <sgtty.h>

/*
 * Lock a terminal up until the knowledgeable Joe returns.
 */
char	masterp[] =	"hasta la vista\n";
struct	sgttyb tty, ntty;
char	s[BUFSIZ], s1[BUFSIZ];

main(argc, argv)
	char **argv;
{
	register int t;
	struct stat statb;

	
	/*
	 *	Ignore signals generated from tty keyboard.  These signals
	 *	are for xBSD only.  This program should be compiled with
	 *	the jobs library (cc ... -ljobs).
	 */
	sigset( SIGINT, SIG_IGN ); 
	sigset( SIGQUIT, SIG_IGN ); 
	sigset( SIGTSTP, SIG_IGN ); 

	if (argc > 0)
		argv[0] = 0;
	if (gtty(0, &tty))
		exit(1);
	ntty = tty; ntty.sg_flags &= ~ECHO;
	stty(0, &ntty);
	printf("Key: ");
	fgets(s, sizeof s, stdin);
	printf("\nAgain: ");
	fgets(s1, sizeof s1, stdin);
	putchar('\n');
	if (strcmp(s1, s)) {
		putchar(07);
		stty(0, &tty);
		exit(1);
	}
	s[0] = 0;
	for (;;) {
		fgets(s, sizeof s, stdin);
		if (strcmp(s1, s) == 0)
			break;
		if (strcmp(s, masterp) == 0)
			break;
		putchar(07);
		if (gtty(0, &ntty))
			exit(1);
	}
	stty(0, &tty);
}