usr/src/ucblib/libcurses/tstp.c

   1 /*
   2  * Copyright 2001 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*      Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T     */
   7 /*        All Rights Reserved   */
   8
   9 /*
  10  * Copyright (c) 1980 Regents of the University of California.
  11  * All rights reserved.  The Berkeley software License Agreement
  12  * specifies the terms and conditions for redistribution.
  13  */
  14
  15 #pragma ident   "%Z%%M% %I%     %E% SMI"
  16
  17 #ifndef lint
  18 static char
  19 sccsid[] = "@(#)tstp.c 1.6 88/02/08 SMI"; /* from UCB 5.1 85/06/07 */
  20 #endif /* not lint */
  21
  22 #include        <sys/types.h>
  23 #include        <signal.h>
  24 #include        "curses.ext"
  25 #include        <sgtty.h>
  26
  27 /*
  28  * handle stop and start signals
  29  *
  30  * @(#)tstp.c   5.1 (Berkeley) 6/7/85
  31  */
  32
  33 void
  34 tstp(void)
  35 {
  36 #ifdef SIGTSTP
  37
  38         SGTTY   tty;
  39 #ifdef DEBUG
  40         if (outf)
  41                 (void) fflush(outf);
  42 #endif
  43         tty = _tty;
  44         (void) mvcur(0, COLS - 1, LINES - 1, 0);
  45         (void) endwin();
  46         (void) fflush(stdout);
  47         /* reset signal handler so kill below stops us */
  48         (void) signal(SIGTSTP, SIG_DFL);
  49         (void) sigsetmask(sigblock(0) &~ sigmask(SIGTSTP));
  50         (void) kill(0, SIGTSTP);
  51         (void) sigblock(sigmask(SIGTSTP));
  52         (void) signal(SIGTSTP, (void(*)(int))tstp);
  53         _tty = tty;
  54         (void) stty(_tty_ch, &_tty);
  55         (void) wrefresh(curscr);
  56 #endif  /* SIGTSTP */
  57 }