io.c revision 87710 
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#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/talk/io.c 87710 2001-12-11 23:51:14Z markm $");
37
38#ifndef lint
39static const char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
40#endif
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 <sys/filio.h>
49
50#include <errno.h>
51#include <netdb.h>
52#include <stdlib.h>
53#include <string.h>
54#include <unistd.h>
55
56#include "talk.h"
57#include "talk_ctl.h"
58
59#define A_LONG_TIME 10000000
60
61/*
62 * The routine to do the actual talking
63 */
64void
65talk()
66{
67	struct hostent *hp, *hp2;
68	int nb;
69	fd_set read_set, read_template;
70	char buf[BUFSIZ], **addr, *his_machine_name;
71	struct timeval wait;
72
73	his_machine_name = NULL;
74	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
75	    sizeof(his_machine_addr.s_addr), AF_INET);
76	if (hp != NULL) {
77		hp2 = gethostbyname(hp->h_name);
78		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
79		    hp2->h_length == sizeof(his_machine_addr))
80			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
81				if (memcmp(*addr, &his_machine_addr,
82				    sizeof(his_machine_addr)) == 0) {
83					his_machine_name = strdup(hp->h_name);
84					break;
85				}
86	}
87	if (his_machine_name == NULL)
88		his_machine_name = strdup(inet_ntoa(his_machine_addr));
89	snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
90	    msg.r_name, his_machine_name);
91	free(his_machine_name);
92	message(buf);
93	write(STDOUT_FILENO, "\007\007\007", 3);
94
95	current_line = 0;
96
97	/*
98	 * Wait on both the other process (sockt_mask) and
99	 * standard input ( STDIN_MASK )
100	 */
101	FD_ZERO(&read_template);
102	FD_SET(sockt, &read_template);
103	FD_SET(fileno(stdin), &read_template);
104	for (;;) {
105		read_set = read_template;
106		wait.tv_sec = A_LONG_TIME;
107		wait.tv_usec = 0;
108		nb = select(32, &read_set, 0, 0, &wait);
109		if (nb <= 0) {
110			if (errno == EINTR) {
111				read_set = read_template;
112				continue;
113			}
114			/* panic, we don't know what happened */
115			p_error("Unexpected error from select");
116			quit();
117		}
118		if (FD_ISSET(sockt, &read_set)) {
119			/* There is data on sockt */
120			nb = read(sockt, buf, sizeof buf);
121			if (nb <= 0) {
122				message("Connection closed. Exiting");
123				quit();
124			}
125			display(&his_win, buf, nb);
126		}
127		if (FD_ISSET(fileno(stdin), &read_set)) {
128			/*
129			 * We can't make the tty non_blocking, because
130			 * curses's output routines would screw up
131			 */
132			int i;
133			ioctl(0, FIONREAD, (struct sgttyb *) &nb);
134			nb = read(STDIN_FILENO, buf, nb);
135			display(&my_win, buf, nb);
136			/* might lose data here because sockt is non-blocking */
137			for (i = 0; i < nb; ++i)
138				if (buf[i] == '\r')
139					buf[i] = '\n';
140			write(sockt, buf, nb);
141		}
142	}
143}
144
145/*
146 * p_error prints the system error message on the standard location
147 * on the screen and then exits. (i.e. a curses version of perror)
148 */
149void
150p_error(string)
151	const char *string;
152{
153	wmove(my_win.x_win, current_line, 0);
154	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
155	    string, strerror(errno), errno);
156	wrefresh(my_win.x_win);
157	move(LINES-1, 0);
158	refresh();
159	quit();
160}
161
162/*
163 * Display string in the standard location
164 */
165void
166message(string)
167	const char *string;
168{
169	wmove(my_win.x_win, current_line, 0);
170	wprintw(my_win.x_win, "[%s]\n", string);
171	if (current_line < my_win.x_nlines - 1)
172		current_line++;
173	wrefresh(my_win.x_win);
174}
175