usr/src/lib/libcurses/screen/ttimeout.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1997 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1988 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  * University Copyright- Copyright (c) 1982, 1986, 1988
  32  * The Regents of the University of California
  33  * All Rights Reserved
  34  *
  35  * University Acknowledgment- Portions of this document are derived from
  36  * software developed by the University of California, Berkeley, and its
  37  * contributors.
  38  */
  39
  40 #pragma ident   "%Z%%M% %I%     %E% SMI"
  41
  42 /*LINTLIBRARY*/
  43
  44 #include        <sys/types.h>
  45 #include        "curses_inc.h"
  46 #include        <fcntl.h>
  47
  48 /*
  49  * Set the current time-out period for getting input.
  50  *
  51  * delay:       < 0 for infinite delay (blocking read)
  52  *              = 0 for no delay read
  53  *              > 0 to specify a period in millisecs to wait
  54  *              for input, then return '\0' if none comes
  55  */
  56
  57 static void     _setblock(int), _settimeout(int);
  58
  59 int
  60 ttimeout(int delay)
  61 {
  62         if (cur_term->_inputfd < 0)
  63                 return (ERR);
  64
  65         if (delay < 0)
  66                 delay = -1;
  67
  68         if (cur_term->_delay == delay)
  69                 goto good;
  70
  71 #ifdef  SYSV
  72         if (delay > 0) {
  73                 if (cur_term->_delay < 0)
  74                         _setblock(-delay);
  75                 _settimeout(delay);
  76         } else
  77                 if ((delay + cur_term->_delay) == -1)
  78                         _setblock(delay);
  79                 else {
  80                         if (delay < 0)
  81                                 _setblock(delay);
  82                         _settimeout(delay);
  83                 }
  84 #else   /* SYSV */
  85         cbreak();
  86 #endif  /* SYSV */
  87
  88         cur_term->_delay = delay;
  89 good:
  90         return (OK);
  91 }
  92
  93 #ifdef  SYSV
  94 /* set the terminal to nodelay (==0) or block(<0) */
  95 static  void
  96 _setblock(int block)
  97 {
  98         int     flags = fcntl(cur_term->_inputfd, F_GETFL, 0);
  99
 100         if (block < 0)
 101                 flags &= ~O_NDELAY;
 102         else
 103                 flags |= O_NDELAY;
 104
 105         (void) fcntl(cur_term->_inputfd, F_SETFL, flags);
 106 }
 107
 108 /*
 109  * set the terminal to timeout in t milliseconds,
 110  * rounded up to the nearest 10th of a second.
 111  */
 112 static  void
 113 _settimeout(int num)
 114 {
 115         PROGTTYS.c_lflag &= ~ICANON;
 116         if (num > 0) {
 117                 PROGTTYS.c_cc[VMIN] = 0;
 118                 PROGTTYS.c_cc[VTIME] = (num > 25500) ? 255 : (num + 99) / 100;
 119                 cur_term->_fl_rawmode = 3;
 120         } else {
 121                 PROGTTYS.c_cc[VMIN] = 1;
 122                 PROGTTYS.c_cc[VTIME] = 0;
 123                 cur_term->_fl_rawmode = 1;
 124         }
 125         (void) reset_prog_mode();
 126 }
 127 #endif  /* SYSV */