75 lines
2.8 KiB
C
75 lines
2.8 KiB
C
/*
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* Copyright (c) 1983 Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Edward Wang at The University of California, Berkeley.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef lint
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/*static char sccsid[] = "from: @(#)wwrint.c 3.12 (Berkeley) 7/1/91";*/
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static char rcsid[] = "$Id: wwrint.c,v 1.2 1993/08/01 18:02:38 mycroft Exp $";
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#endif /* not lint */
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#include "ww.h"
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#include <fcntl.h>
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/*
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* Tty input interrupt handler.
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* (1) Read input into buffer (wwib*).
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* (2) Set the interrupt flag if anything is read.
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* Currently, the last is used to get out of the blocking
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* select() in wwiomux().
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* To avoid race conditions, we only modify wwibq in here, except
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* when the buffer is empty; and everywhere else, we only change wwibp.
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* It should be completely safe.
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*/
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void
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wwrint()
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{
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register n;
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if (wwibp == wwibq)
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wwibp = wwibq = wwib;
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wwnread++;
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(void) fcntl(0, F_SETFL, O_NONBLOCK|wwnewtty.ww_fflags);
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n = read(0, wwibq, wwibe - wwibq);
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(void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
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if (n > 0) {
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wwibq += n;
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wwnreadc += n;
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wwsetintr();
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} else if (n == 0)
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wwnreadz++;
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else
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wwnreade++;
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}
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