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1.3 ! niklas 1: /* $NetBSD: wwiomux.c,v 1.5 1996/02/08 20:45:09 mycroft Exp $ */
1.1 deraadt 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[] = "@(#)wwiomux.c 8.1 (Berkeley) 6/6/93";
42: #else
1.3 ! niklas 43: static char rcsid[] = "$NetBSD: wwiomux.c,v 1.5 1996/02/08 20:45:09 mycroft Exp $";
1.1 deraadt 44: #endif
45: #endif /* not lint */
46:
47: #include "ww.h"
48: #include <sys/time.h>
49: #include <sys/types.h>
50: #if !defined(OLD_TTY) && !defined(TIOCPKT_DATA)
51: #include <sys/ioctl.h>
52: #endif
53: #include <fcntl.h>
54:
55: /*
56: * Multiple window output handler.
57: * The idea is to copy window outputs to the terminal, via the
58: * display package. We try to give wwcurwin highest priority.
59: * The only return conditions are when there is keyboard input
1.2 deraadt 60: * and when a child process dies.
1.1 deraadt 61: * When there's nothing to do, we sleep in a select().
62: * The history of this routine is interesting.
63: */
64: wwiomux()
65: {
66: register struct ww *w;
67: fd_set imask;
68: register n;
69: register char *p;
70: char c;
71: struct timeval tv;
72: char noblock = 0;
73:
74: for (;;) {
75: if (wwinterrupt()) {
76: wwclrintr();
77: return;
78: }
79:
80: FD_ZERO(&imask);
81: n = -1;
82: for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
83: if (w->ww_pty < 0)
84: continue;
85: if (w->ww_obq < w->ww_obe) {
86: if (w->ww_pty > n)
1.2 deraadt 87: n = w->ww_pty + 1;
1.1 deraadt 88: FD_SET(w->ww_pty, &imask);
89: }
1.3 ! niklas 90: if (w->ww_obq > w->ww_obp &&
! 91: !ISSET(w->ww_pflags, WWP_STOPPED))
1.1 deraadt 92: noblock = 1;
93: }
1.2 deraadt 94: if (wwibq < wwibe) {
95: if (0 > n)
96: n = 0 + 1;
97: FD_SET(0, &imask);
98: }
1.1 deraadt 99:
100: if (!noblock) {
101: if (wwcurwin != 0)
102: wwcurtowin(wwcurwin);
103: wwupdate();
104: wwflush();
105: (void) setjmp(wwjmpbuf);
106: wwsetjmp = 1;
107: if (wwinterrupt()) {
108: wwsetjmp = 0;
109: wwclrintr();
110: return;
111: }
1.2 deraadt 112: /* XXXX */
1.1 deraadt 113: tv.tv_sec = 30;
114: tv.tv_usec = 0;
115: } else {
116: tv.tv_sec = 0;
117: tv.tv_usec = 10000;
118: }
119: wwnselect++;
120: n = select(n + 1, &imask, (fd_set *)0, (fd_set *)0, &tv);
121: wwsetjmp = 0;
122: noblock = 0;
123:
124: if (n < 0)
125: wwnselecte++;
126: else if (n == 0)
127: wwnselectz++;
1.2 deraadt 128: else {
129: if (FD_ISSET(0, &imask))
130: wwrint();
1.1 deraadt 131: for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
132: if (w->ww_pty < 0 ||
133: !FD_ISSET(w->ww_pty, &imask))
134: continue;
135: wwnwread++;
136: p = w->ww_obq;
1.2 deraadt 137: if (w->ww_type == WWT_PTY) {
1.1 deraadt 138: if (p == w->ww_ob) {
139: w->ww_obp++;
140: w->ww_obq++;
141: } else
142: p--;
143: c = *p;
144: }
145: n = read(w->ww_pty, p, w->ww_obe - p);
146: if (n < 0) {
147: wwnwreade++;
148: (void) close(w->ww_pty);
149: w->ww_pty = -1;
150: } else if (n == 0) {
151: wwnwreadz++;
152: (void) close(w->ww_pty);
153: w->ww_pty = -1;
1.2 deraadt 154: } else if (w->ww_type != WWT_PTY) {
1.1 deraadt 155: wwnwreadd++;
156: wwnwreadc += n;
157: w->ww_obq += n;
158: } else if (*p == TIOCPKT_DATA) {
159: n--;
160: wwnwreadd++;
161: wwnwreadc += n;
162: w->ww_obq += n;
163: } else {
164: wwnwreadp++;
165: if (*p & TIOCPKT_STOP)
1.3 ! niklas 166: SET(w->ww_pflags, WWP_STOPPED);
1.1 deraadt 167: if (*p & TIOCPKT_START)
1.3 ! niklas 168: CLR(w->ww_pflags, WWP_STOPPED);
1.1 deraadt 169: if (*p & TIOCPKT_FLUSHWRITE) {
1.3 ! niklas 170: CLR(w->ww_pflags, WWP_STOPPED);
1.1 deraadt 171: w->ww_obq = w->ww_obp =
172: w->ww_ob;
173: }
174: }
175: }
1.2 deraadt 176: }
1.1 deraadt 177: /*
178: * Try the current window first, if there is output
179: * then process it and go back to the top to try again.
180: * This can lead to starvation of the other windows,
181: * but presumably that what we want.
182: * Update will eventually happen when output from wwcurwin
183: * dies down.
184: */
185: if ((w = wwcurwin) != 0 && w->ww_pty >= 0 &&
1.3 ! niklas 186: w->ww_obq > w->ww_obp &&
! 187: !ISSET(w->ww_pflags, WWP_STOPPED)) {
1.1 deraadt 188: n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp);
189: if ((w->ww_obp += n) == w->ww_obq)
190: w->ww_obq = w->ww_obp = w->ww_ob;
191: noblock = 1;
192: continue;
193: }
194: for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw)
195: if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp &&
1.3 ! niklas 196: !ISSET(w->ww_pflags, WWP_STOPPED)) {
1.1 deraadt 197: n = wwwrite(w, w->ww_obp,
198: w->ww_obq - w->ww_obp);
199: if ((w->ww_obp += n) == w->ww_obq)
200: w->ww_obq = w->ww_obp = w->ww_ob;
201: if (wwinterrupt())
202: break;
203: }
204: }
205: }