2.9BSD - /usr/src/ucb/lock.c

   1: #ifndef lint
   2: static char *sccsid = "@(#)lock.c	4.1 (Berkeley) 10/1/80";
   3: #endif
   4: #include <whoami.h>
   5: #include <stdio.h>
   6: #include <sys/types.h>
   7: #include <stat.h>
   8: #include <signal.h>
   9: #include <sgtty.h>
  10: 
  11: /*
  12:  * Lock a terminal up until the knowledgeable Joe returns.
  13:  */
  14: char    masterp[] = "knowledgeable Joe\n";
  15: struct  sgttyb tty, ntty;
  16: char    s[BUFSIZ], s1[BUFSIZ];
  17: 
  18: main(argc, argv)
  19:     char **argv;
  20: {
  21:     register int t;
  22: 
  23:     for (t = 1; t <= 16; t++)
  24:         if (t != SIGHUP)
  25:         signal(t, SIG_IGN);
  26: #ifdef  SIGTSTP
  27:     signal(SIGTSTP, SIG_IGN);
  28: #endif
  29:     if (argc > 0)
  30:         argv[0] = 0;
  31:     if (gtty(0, &tty))
  32:         exit(1);
  33:     ntty = tty; ntty.sg_flags &= ~ECHO;
  34:     stty(0, &ntty);
  35:     printf("Key: ");
  36:     fgets(s, sizeof s, stdin);
  37:     printf("\nAgain: ");
  38:     fgets(s1, sizeof s1, stdin);
  39:     putchar('\n');
  40:     if (strcmp(s1, s)) {
  41:         putchar(07);
  42:         stty(0, &tty);
  43:         exit(1);
  44:     }
  45:     s[0] = 0;
  46:     for (;;) {
  47:         fgets(s, sizeof s, stdin);
  48:         if (strcmp(s1, s) == 0)
  49:             break;
  50:         if (strcmp(s, masterp) == 0)
  51:             break;
  52:         putchar(07);
  53:         if (gtty(0, &ntty))
  54:             exit(1);
  55:     }
  56:     stty(0, &tty);
  57: }

Defined functions

Defined variables