io.c revision 80381 
1/*
2 * Copyright (c) 1983, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#ifndef lint
35#if 0
36static char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
37#endif
38static const char rcsid[] =
39  "$FreeBSD: head/usr.bin/talk/io.c 80381 2001-07-26 11:02:39Z sheldonh $";
40#endif /* not lint */
41
42/*
43 * This file contains the I/O handling and the exchange of
44 * edit characters. This connection itself is established in
45 * ctl.c
46 */
47
48#include <errno.h>
49#include <string.h>
50#include <sys/filio.h>
51#include <unistd.h>
52#include "talk.h"
53
54#define A_LONG_TIME 10000000
55
56/*
57 * The routine to do the actual talking
58 */
59void
60talk()
61{
62	int nb;
63	fd_set read_set, read_template;
64	char buf[BUFSIZ];
65	struct timeval wait;
66
67	message("Connection established");
68	write(STDOUT_FILENO, "\007\007\007", 3);
69
70	current_line = 0;
71
72	/*
73	 * Wait on both the other process (sockt_mask) and
74	 * standard input ( STDIN_MASK )
75	 */
76	FD_ZERO(&read_template);
77	FD_SET(sockt, &read_template);
78	FD_SET(fileno(stdin), &read_template);
79	for (;;) {
80		read_set = read_template;
81		wait.tv_sec = A_LONG_TIME;
82		wait.tv_usec = 0;
83		nb = select(32, &read_set, 0, 0, &wait);
84		if (nb <= 0) {
85			if (errno == EINTR) {
86				read_set = read_template;
87				continue;
88			}
89			/* panic, we don't know what happened */
90			p_error("Unexpected error from select");
91			quit();
92		}
93		if (FD_ISSET(sockt, &read_set)) {
94			/* There is data on sockt */
95			nb = read(sockt, buf, sizeof buf);
96			if (nb <= 0) {
97				message("Connection closed. Exiting");
98				quit();
99			}
100			display(&his_win, buf, nb);
101		}
102		if (FD_ISSET(fileno(stdin), &read_set)) {
103			/*
104			 * We can't make the tty non_blocking, because
105			 * curses's output routines would screw up
106			 */
107			int i;
108			ioctl(0, FIONREAD, (struct sgttyb *) &nb);
109			nb = read(STDIN_FILENO, buf, nb);
110			display(&my_win, buf, nb);
111			/* might lose data here because sockt is non-blocking */
112			for (i = 0; i < nb; ++i)
113				if (buf[i] == '\r')
114					buf[i] = '\n';
115			write(sockt, buf, nb);
116		}
117	}
118}
119
120/*
121 * p_error prints the system error message on the standard location
122 * on the screen and then exits. (i.e. a curses version of perror)
123 */
124void
125p_error(string)
126	char *string;
127{
128	wmove(my_win.x_win, current_line, 0);
129	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
130	    string, strerror(errno), errno);
131	wrefresh(my_win.x_win);
132	move(LINES-1, 0);
133	refresh();
134	quit();
135}
136
137/*
138 * Display string in the standard location
139 */
140void
141message(string)
142	char *string;
143{
144	wmove(my_win.x_win, current_line, 0);
145	wprintw(my_win.x_win, "[%s]\n", string);
146	if (current_line < my_win.x_nlines - 1)
147		current_line++;
148	wrefresh(my_win.x_win);
149}
150