Annotation of src/usr.bin/window/wwrint.c, Revision 1.1.1.1
1.1 deraadt 1: /* $NetBSD: wwrint.c,v 1.3 1995/09/28 10:35:52 tls Exp $ */
2:
3: /*
4: * Copyright (c) 1983, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Edward Wang at The University of California, Berkeley.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the University of
21: * California, Berkeley and its contributors.
22: * 4. Neither the name of the University nor the names of its contributors
23: * may be used to endorse or promote products derived from this software
24: * without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36: * SUCH DAMAGE.
37: */
38:
39: #ifndef lint
40: #if 0
41: static char sccsid[] = "@(#)wwrint.c 8.1 (Berkeley) 6/6/93";
42: #else
43: static char rcsid[] = "$NetBSD: wwrint.c,v 1.3 1995/09/28 10:35:52 tls Exp $";
44: #endif
45: #endif /* not lint */
46:
47: #include "ww.h"
48: #include "tt.h"
49: #if defined(OLD_TTY) || defined(VMIN_BUG)
50: #include <fcntl.h>
51: #endif
52:
53: /*
54: * Tty input interrupt handler.
55: * (1) Read input into buffer (wwib*).
56: * (2) Set the interrupt flag if anything is read.
57: * Currently, the last is used to get out of the blocking
58: * select() in wwiomux().
59: * To avoid race conditions, we only modify wwibq in here, except
60: * when the buffer is empty; and everywhere else, we only change wwibp.
61: * It should be completely safe.
62: */
63: void
64: wwrint()
65: {
66: register n;
67:
68: if (wwibp == wwibq)
69: wwibp = wwibq = wwib;
70: wwnread++;
71: #if defined(OLD_TTY) || defined(VMIN_BUG)
72: /* we have set c_cc[VMIN] to 0 */
73: (void) fcntl(0, F_SETFL, O_NONBLOCK|wwnewtty.ww_fflags);
74: #endif
75: n = read(0, wwibq, wwibe - wwibq);
76: #if defined(OLD_TTY) || defined(VMIN_BUG)
77: (void) fcntl(0, F_SETFL, wwnewtty.ww_fflags);
78: #endif
79: if (n > 0) {
80: if (tt.tt_rint)
81: n = (*tt.tt_rint)(wwibq, n);
82: if (n > 0) {
83: wwibq += n;
84: wwnreadc += n;
85: /*
86: * Hasten or delay the next checkpoint,
87: * as the case may be.
88: */
89: if (tt.tt_checkpoint && !wwdocheckpoint)
90: (void) alarm(1);
91: wwsetintr();
92: }
93: } else if (n == 0)
94: wwnreadz++;
95: else
96: wwnreade++;
97: }