usr/src/lib/libcurses/screen/flushinp.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        <unistd.h>
  45 #include        <sys/types.h>
  46 #include        "curses_inc.h"
  47
  48 int
  49 flushinp(void)
  50 {
  51 #ifdef  DEBUG
  52         if (outf)
  53                 fprintf(outf, "flushinp(), file %x, SP %x\n",
  54                     cur_term->Filedes, SP);
  55 #endif  /* DEBUG */
  56
  57 #ifdef  SYSV
  58         (void) ioctl(cur_term -> Filedes, TCFLSH, 0);
  59 #else   /* SYSV */
  60         /* for insurance against someone using their own buffer: */
  61         (void) ioctl(cur_term -> Filedes, TIOCGETP, &(PROGTTY));
  62
  63         /*
  64          * SETP waits on output and flushes input as side effect.
  65          * Really want an ioctl like TCFLSH but Berkeley doesn't have one.
  66          */
  67         (void) ioctl(cur_term -> Filedes, TIOCSETP, &(PROGTTY));
  68 #endif  /* SYSV */
  69
  70         /*
  71          * Get rid of any typeahead which was read().
  72          * Leave characters which were ungetch()'d.
  73          */
  74         cur_term->_chars_on_queue = cur_term->_ungotten;
  75
  76         /*
  77          * Have to doupdate() because, if we have stopped output due to
  78          * typeahead, now that typeahead is gone, so we had better catch up.
  79          */
  80         if (_INPUTPENDING)
  81                 (void) doupdate();
  82         return (OK);
  83 }