Annotation of src/usr.bin/window/wwrint.c, Revision 1.6
1.6 ! millert 1: /* $OpenBSD: wwrint.c,v 1.5 2001/11/19 19:02:18 mpech Exp $ */
1.2 deraadt 2: /* $NetBSD: wwrint.c,v 1.4 1995/12/21 10:46:24 mycroft Exp $ */
1.1 deraadt 3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * This code is derived from software contributed to Berkeley by
9: * Edward Wang at The University of California, Berkeley.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
1.6 ! millert 19: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 20: * may be used to endorse or promote products derived from this software
21: * without specific prior written permission.
22: *
23: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33: * SUCH DAMAGE.
34: */
35:
36: #ifndef lint
37: #if 0
38: static char sccsid[] = "@(#)wwrint.c 8.1 (Berkeley) 6/6/93";
39: #else
1.6 ! millert 40: static char rcsid[] = "$OpenBSD: wwrint.c,v 1.5 2001/11/19 19:02:18 mpech Exp $";
1.1 deraadt 41: #endif
42: #endif /* not lint */
43:
44: #include "ww.h"
45: #include "tt.h"
46:
47: /*
48: * Tty input interrupt handler.
49: * (1) Read input into buffer (wwib*).
50: * (2) Set the interrupt flag if anything is read.
51: * Currently, the last is used to get out of the blocking
52: * select() in wwiomux().
53: * To avoid race conditions, we only modify wwibq in here, except
54: * when the buffer is empty; and everywhere else, we only change wwibp.
55: * It should be completely safe.
56: */
57: void
58: wwrint()
59: {
1.5 mpech 60: int n;
1.1 deraadt 61:
62: wwnread++;
63: n = read(0, wwibq, wwibe - wwibq);
64: if (n > 0) {
65: if (tt.tt_rint)
66: n = (*tt.tt_rint)(wwibq, n);
67: if (n > 0) {
68: wwibq += n;
69: wwnreadc += n;
70: /*
71: * Hasten or delay the next checkpoint,
72: * as the case may be.
73: */
74: if (tt.tt_checkpoint && !wwdocheckpoint)
75: (void) alarm(1);
76: wwsetintr();
77: }
78: } else if (n == 0)
79: wwnreadz++;
80: else
81: wwnreade++;
82: }