BSD 4 release

[unix-history] / usr / src / cmd / lock.c

static char *sccsid = "@(#)lock.c       4.1 (Berkeley) 10/1/80";
#include <stdio.h>
#include <sys/types.h>
#include <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;

       for (t = 1; t <= 16; t++)
               if (t != SIGHUP)
               signal(t, 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);
}