[apple/shell_cmds.git] / window / wwiomux.c

/*	$NetBSD: wwiomux.c,v 1.6 1997/11/21 08:37:30 lukem Exp $	*/

/*
 * 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.
 */

#include <sys/cdefs.h>
#ifndef lint
#if 0
static char sccsid[] = "@(#)wwiomux.c	8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: wwiomux.c,v 1.6 1997/11/21 08:37:30 lukem Exp $");
#endif
#endif /* not lint */

#include <sys/types.h>
#if !defined(OLD_TTY) && !defined(TIOCPKT_DATA)
#include <sys/ioctl.h>
#endif
#include <sys/time.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "ww.h"

/*
 * Multiple window output handler.
 * The idea is to copy window outputs to the terminal, via the
 * display package.  We try to give wwcurwin highest priority.
 * The only return conditions are when there is keyboard input
 * and when a child process dies.
 * When there's nothing to do, we sleep in a select().
 * The history of this routine is interesting.
 */
void
wwiomux()
{
	struct ww *w;
	fd_set imask;
	volatile int n;
	char *p;
	char c;
	struct timeval tv;
	char noblock = 0;

	for (;;) {
		if (wwinterrupt()) {
			wwclrintr();
			return;
		}

		FD_ZERO(&imask);
		n = -1;
		for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
			if (w->ww_pty < 0)
				continue;
			if (w->ww_obq < w->ww_obe) {
				if (w->ww_pty > n)
					n = w->ww_pty + 1;
				FD_SET(w->ww_pty, &imask);
			}
			if (w->ww_obq > w->ww_obp &&
			    !ISSET(w->ww_pflags, WWP_STOPPED))
				noblock = 1;
		}
		if (wwibq < wwibe) {
			if (0 > n)
				n = 0 + 1;
			FD_SET(0, &imask);
		}

		if (!noblock) {
			if (wwcurwin != 0)
				wwcurtowin(wwcurwin);
			wwupdate();
			wwflush();
			(void) setjmp(wwjmpbuf);
			wwsetjmp = 1;
			if (wwinterrupt()) {
				wwsetjmp = 0;
				wwclrintr();
				return;
			}
			/* XXXX */
			tv.tv_sec = 30;
			tv.tv_usec = 0;
		} else {
			tv.tv_sec = 0;
			tv.tv_usec = 10000;
		}
		wwnselect++;
		n = select(n + 1, &imask, (fd_set *)0, (fd_set *)0, &tv);
		wwsetjmp = 0;
		noblock = 0;

		if (n < 0)
			wwnselecte++;
		else if (n == 0)
			wwnselectz++;
		else {
			if (FD_ISSET(0, &imask))
				wwrint();
			for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
				if (w->ww_pty < 0 ||
				    !FD_ISSET(w->ww_pty, &imask))
					continue;
				wwnwread++;
				p = w->ww_obq;
				if (w->ww_type == WWT_PTY) {
					if (p == w->ww_ob) {
						w->ww_obp++;
						w->ww_obq++;
					} else
						p--;
					c = *p;
				}
				n = read(w->ww_pty, p, w->ww_obe - p);
				if (n < 0) {
					wwnwreade++;
					(void) close(w->ww_pty);
					w->ww_pty = -1;
				} else if (n == 0) {
					wwnwreadz++;
					(void) close(w->ww_pty);
					w->ww_pty = -1;
				} else if (w->ww_type != WWT_PTY) {
					wwnwreadd++;
					wwnwreadc += n;
					w->ww_obq += n;
				} else if (*p == TIOCPKT_DATA) {
					n--;
					wwnwreadd++;
					wwnwreadc += n;
					w->ww_obq += n;
				} else {
					wwnwreadp++;
					if (*p & TIOCPKT_STOP)
						SET(w->ww_pflags, WWP_STOPPED);
					if (*p & TIOCPKT_START)
						CLR(w->ww_pflags, WWP_STOPPED);
					if (*p & TIOCPKT_FLUSHWRITE) {
						CLR(w->ww_pflags, WWP_STOPPED);
						w->ww_obq = w->ww_obp =
							w->ww_ob;
					}
				}
			}
		}
		/*
		 * Try the current window first, if there is output
		 * then process it and go back to the top to try again.
		 * This can lead to starvation of the other windows,
		 * but presumably that what we want.
		 * Update will eventually happen when output from wwcurwin
		 * dies down.
		 */
		if ((w = wwcurwin) != 0 && w->ww_pty >= 0 &&
		    w->ww_obq > w->ww_obp &&
		    !ISSET(w->ww_pflags, WWP_STOPPED)) {
			n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp);
			if ((w->ww_obp += n) == w->ww_obq)
				w->ww_obq = w->ww_obp = w->ww_ob;
			noblock = 1;
			continue;
		}
		for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw)
			if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp &&
			    !ISSET(w->ww_pflags, WWP_STOPPED)) {
				n = wwwrite(w, w->ww_obp,
					w->ww_obq - w->ww_obp);
				if ((w->ww_obp += n) == w->ww_obq)
					w->ww_obq = w->ww_obp = w->ww_ob;
				if (wwinterrupt())
					break;
			}
	}
}
Commit	Line	Data
44bd5ea7 A	1	/* $NetBSD: wwiomux.c,v 1.6 1997/11/21 08:37:30 lukem 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	#include <sys/cdefs.h>
	40	#ifndef lint
	41	#if 0
	42	static char sccsid[] = "@(#)wwiomux.c 8.1 (Berkeley) 6/6/93";
	43	#else
	44	__RCSID("$NetBSD: wwiomux.c,v 1.6 1997/11/21 08:37:30 lukem Exp $");
	45	#endif
	46	#endif /* not lint */
	47
	48	#include <sys/types.h>
	49	#if !defined(OLD_TTY) && !defined(TIOCPKT_DATA)
	50	#include <sys/ioctl.h>
	51	#endif
	52	#include <sys/time.h>
	53	#include <fcntl.h>
	54	#include <string.h>
	55	#include <unistd.h>
	56	#include "ww.h"
	57
	58	/*
	59	* Multiple window output handler.
	60	* The idea is to copy window outputs to the terminal, via the
	61	* display package. We try to give wwcurwin highest priority.
	62	* The only return conditions are when there is keyboard input
	63	* and when a child process dies.
	64	* When there's nothing to do, we sleep in a select().
65	* The history of this routine is interesting.
66	*/
67	void
68	wwiomux()
69	{
70	struct ww *w;
71	fd_set imask;
72	volatile int n;
73	char *p;
74	char c;
75	struct timeval tv;
76	char noblock = 0;
77
78	for (;;) {
79	if (wwinterrupt()) {
80	wwclrintr();
81	return;
82	}
83
84	FD_ZERO(&imask);
85	n = -1;
86	for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
87	if (w->ww_pty < 0)
88	continue;
89	if (w->ww_obq < w->ww_obe) {
90	if (w->ww_pty > n)
91	n = w->ww_pty + 1;
92	FD_SET(w->ww_pty, &imask);
93	}
94	if (w->ww_obq > w->ww_obp &&
95	!ISSET(w->ww_pflags, WWP_STOPPED))
96	noblock = 1;
97	}
98	if (wwibq < wwibe) {
99	if (0 > n)
100	n = 0 + 1;
101	FD_SET(0, &imask);
102	}
103
104	if (!noblock) {
105	if (wwcurwin != 0)
106	wwcurtowin(wwcurwin);
107	wwupdate();
108	wwflush();
109	(void) setjmp(wwjmpbuf);
110	wwsetjmp = 1;
111	if (wwinterrupt()) {
112	wwsetjmp = 0;
113	wwclrintr();
114	return;
115	}
116	/* XXXX */
117	tv.tv_sec = 30;
118	tv.tv_usec = 0;
119	} else {
120	tv.tv_sec = 0;
121	tv.tv_usec = 10000;
122	}
123	wwnselect++;
124	n = select(n + 1, &imask, (fd_set )0, (fd_set )0, &tv);
125	wwsetjmp = 0;
126	noblock = 0;
127
128	if (n < 0)
129	wwnselecte++;
130	else if (n == 0)
131	wwnselectz++;
132	else {
133	if (FD_ISSET(0, &imask))
134	wwrint();
135	for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw) {
136	if (w->ww_pty < 0 \|\|
137	!FD_ISSET(w->ww_pty, &imask))
138	continue;
139	wwnwread++;
140	p = w->ww_obq;
141	if (w->ww_type == WWT_PTY) {
142	if (p == w->ww_ob) {
143	w->ww_obp++;
144	w->ww_obq++;
145	} else
146	p--;
147	c = *p;
148	}
149	n = read(w->ww_pty, p, w->ww_obe - p);
150	if (n < 0) {
151	wwnwreade++;
152	(void) close(w->ww_pty);
153	w->ww_pty = -1;
154	} else if (n == 0) {
155	wwnwreadz++;
156	(void) close(w->ww_pty);
157	w->ww_pty = -1;
158	} else if (w->ww_type != WWT_PTY) {
159	wwnwreadd++;
160	wwnwreadc += n;
161	w->ww_obq += n;
162	} else if (*p == TIOCPKT_DATA) {
163	n--;
164	wwnwreadd++;
165	wwnwreadc += n;
166	w->ww_obq += n;
167	} else {
168	wwnwreadp++;
169	if (*p & TIOCPKT_STOP)
170	SET(w->ww_pflags, WWP_STOPPED);
171	if (*p & TIOCPKT_START)
172	CLR(w->ww_pflags, WWP_STOPPED);
173	if (*p & TIOCPKT_FLUSHWRITE) {
174	CLR(w->ww_pflags, WWP_STOPPED);
175	w->ww_obq = w->ww_obp =
176	w->ww_ob;
177	}
178	}
179	}
180	}
181	/*
182	* Try the current window first, if there is output
183	* then process it and go back to the top to try again.
184	* This can lead to starvation of the other windows,
185	* but presumably that what we want.
186	* Update will eventually happen when output from wwcurwin
187	* dies down.
188	*/
189	if ((w = wwcurwin) != 0 && w->ww_pty >= 0 &&
190	w->ww_obq > w->ww_obp &&
191	!ISSET(w->ww_pflags, WWP_STOPPED)) {
192	n = wwwrite(w, w->ww_obp, w->ww_obq - w->ww_obp);
193	if ((w->ww_obp += n) == w->ww_obq)
194	w->ww_obq = w->ww_obp = w->ww_ob;
195	noblock = 1;
196	continue;
197	}
198	for (w = wwhead.ww_forw; w != &wwhead; w = w->ww_forw)
199	if (w->ww_pty >= 0 && w->ww_obq > w->ww_obp &&
200	!ISSET(w->ww_pflags, WWP_STOPPED)) {
201	n = wwwrite(w, w->ww_obp,
202	w->ww_obq - w->ww_obp);
203	if ((w->ww_obp += n) == w->ww_obq)
204	w->ww_obq = w->ww_obp = w->ww_ob;
205	if (wwinterrupt())
206	break;
207	}
208	}
209	}