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/*
* Copyright (c) 1983, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Edward Wang at The University of California, Berkeley.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)wwrint.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include "ww.h"
#include "tt.h"
#if defined(OLD_TTY) || defined(VMIN_BUG)
#include <fcntl.h>
#endif
/*
* Tty input interrupt handler.
* (1) Read input into buffer (wwib*).
* (2) Set the interrupt flag if anything is read.
* Currently, the last is used to get out of the blocking
* select() in wwiomux().
* To avoid race conditions, we only modify wwibq in here, except
* when the buffer is empty; and everywhere else, we only change wwibp.
* It should be completely safe.
*/
void
wwrint()
{
register n;
if (wwibp == wwibq)
wwibp = wwibq = wwib;
wwnread++;
#if defined(OLD_TTY) || defined(VMIN_BUG)
/* we have set c_cc[VMIN] to 0 */
(void) fcntl(0, F_SETFL, O_NONBLOCK|wwnewtty.ww_fflags);
#endif
n = read(0, wwibq, wwibe - wwibq);
#if defined(OLD_TTY) || defined(VMIN_BUG)
(void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
#endif
if (n > 0) {
if (tt.tt_rint)
n = (*tt.tt_rint)(wwibq, n);
if (n > 0) {
wwibq += n;
wwnreadc += n;
/*
* Hasten or delay the next checkpoint,
* as the case may be.
*/
if (tt.tt_checkpoint && !wwdocheckpoint)
(void) alarm(1);
wwsetintr();
}
} else if (n == 0)
wwnreadz++;
else
wwnreade++;
}
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