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Path: utzoo!linus!decvax!genrad!panda!talcott!harvard!seismo!mcvax!enea!erix!mike
From: mike@erix.UUCP (Mike Williams)
Newsgroups: net.sources
Subject: Re: Lock your terminal for lunch
Message-ID: <930@erix.UUCP>
Date: Tue, 10-Sep-85 10:59:08 EDT
Article-I.D.: erix.930
Posted: Tue Sep 10 10:59:08 1985
Date-Received: Sat, 14-Sep-85 02:19:13 EDT
References: <131@pyuxv.UUCP> <679@sfmag.UUCP>
Reply-To: mike@erix.UUCP (Mike Williams)
Organization: L M Ericsson, Stockholm, Sweden
Lines: 42

We use this one.

/* Lock a terminal which is not in use. Give own password to unlock */
#include <signal.h>
#include <stdio.h>
#include <pwd.h>

#define BELL    007

struct  passwd *getpwuid();


main()
{
	int t;
	char *pass;
	char    pwbuf[10];
	char *getpass();
	char    *strcpy();
	char    *crypt();
	char    *pw;
	register struct passwd *pwd;

	/* get password entry */
	pwd = getpwuid(getuid());

	/* signal handling */
	for (t = 1; t <= 26; t++)
		signal(t, SIG_IGN);
	/* Process will die if HUP is received - good for modem lines!   */
		signal(SIGHUP,SIG_DFL);


	/* loop here to wait for correct password */
	while (1) {
		strcpy(pwbuf, getpass("Password:"));
		pw = crypt(pwbuf, pwd->pw_passwd);
		if(strcmp(pw, pwd->pw_passwd) == 0) exit(0);
		putchar(BELL);
		fflush(stdout);
	}
}