kbhitlnx.c

开放源码的编译器open watcom 1.6.0版的源代码

/****************************************************************************
*
*                            Open Watcom Project
*
*    Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
*
*  ========================================================================
*
*    This file contains Original Code and/or Modifications of Original
*    Code as defined in and that are subject to the Sybase Open Watcom
*    Public License version 1.0 (the 'License'). You may not use this file
*    except in compliance with the License. BY USING THIS FILE YOU AGREE TO
*    ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
*    provided with the Original Code and Modifications, and is also
*    available at www.sybase.com/developer/opensource.
*
*    The Original Code and all software distributed under the License are
*    distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
*    EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
*    ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
*    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
*    NON-INFRINGEMENT. Please see the License for the specific language
*    governing rights and limitations under the License.
*
*  ========================================================================
*
* Description:  Implements kbhit() for Linux
*
****************************************************************************/


#include "variety.h"
#include <sys/time.h>
#include <unistd.h>
#include <errno.h>
#include <termios.h>
#include <conio.h>

extern  unsigned    _cbyte;

_WCRTLINK int (kbhit)()
{
    int    rc;
    fd_set s;
    struct timeval tv = { 0, 0 };
    struct termios      old, new;

    tcgetattr( STDIN_FILENO, &old );
    new = old;
    new.c_iflag &= ~(IXOFF | IXON);
    new.c_lflag &= ~(ECHO | ICANON | NOFLSH);
    new.c_lflag |= ISIG;
    new.c_cc[VMIN] = 1;
    new.c_cc[VTIME] = 0;
    tcsetattr( STDIN_FILENO, TCSADRAIN, &new );

    FD_ZERO(&s);
    FD_SET(STDIN_FILENO, &s);
    rc = (select(STDIN_FILENO +1, &s, NULL, NULL, &tv) > 0);

    tcsetattr( STDIN_FILENO, TCSADRAIN, &old );
    return( rc );
}