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/usr.bin/talk/io.c

https://bitbucket.org/freebsd/freebsd-head/
C | 177 lines | 108 code | 15 blank | 54 comment | 26 complexity | 56677e2eb56eef5713c7354fcc5f1950 MD5 | raw file
  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 * 4. Neither the name of the University nor the names of its contributors
 14 *    may be used to endorse or promote products derived from this software
 15 *    without specific prior written permission.
 16 *
 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 27 * SUCH DAMAGE.
 28 */
 29
 30#include <sys/cdefs.h>
 31
 32__FBSDID("$FreeBSD$");
 33
 34#ifndef lint
 35static const char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
 36#endif
 37
 38/*
 39 * This file contains the I/O handling and the exchange of
 40 * edit characters. This connection itself is established in
 41 * ctl.c
 42 */
 43
 44#include <sys/filio.h>
 45
 46#include <errno.h>
 47#include <signal.h>
 48#include <netdb.h>
 49#include <stdlib.h>
 50#include <string.h>
 51#include <unistd.h>
 52
 53#include "talk.h"
 54#include "talk_ctl.h"
 55
 56#define A_LONG_TIME 10000000
 57
 58volatile sig_atomic_t gotwinch = 0;
 59
 60/*
 61 * The routine to do the actual talking
 62 */
 63void
 64talk(void)
 65{
 66	struct hostent *hp, *hp2;
 67	int nb;
 68	fd_set read_set, read_template;
 69	char buf[BUFSIZ], **addr, *his_machine_name;
 70	struct timeval wait;
 71
 72	his_machine_name = NULL;
 73	hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
 74	    sizeof(his_machine_addr.s_addr), AF_INET);
 75	if (hp != NULL) {
 76		hp2 = gethostbyname(hp->h_name);
 77		if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
 78		    hp2->h_length == sizeof(his_machine_addr))
 79			for (addr = hp2->h_addr_list; *addr != NULL; addr++)
 80				if (memcmp(*addr, &his_machine_addr,
 81				    sizeof(his_machine_addr)) == 0) {
 82					his_machine_name = strdup(hp->h_name);
 83					break;
 84				}
 85	}
 86	if (his_machine_name == NULL)
 87		his_machine_name = strdup(inet_ntoa(his_machine_addr));
 88	snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
 89	    msg.r_name, his_machine_name);
 90	free(his_machine_name);
 91	message(buf);
 92	write(STDOUT_FILENO, "\007\007\007", 3);
 93	
 94	current_line = 0;
 95
 96	/*
 97	 * Wait on both the other process (sockt_mask) and
 98	 * standard input ( STDIN_MASK )
 99	 */
100	FD_ZERO(&read_template);
101	FD_SET(sockt, &read_template);
102	FD_SET(fileno(stdin), &read_template);
103	for (;;) {
104		read_set = read_template;
105		wait.tv_sec = A_LONG_TIME;
106		wait.tv_usec = 0;
107		nb = select(32, &read_set, 0, 0, &wait);
108		if (gotwinch) {
109			resize_display();
110			gotwinch = 0;
111		}
112		if (nb <= 0) {
113			if (errno == EINTR) {
114				read_set = read_template;
115				continue;
116			}
117			/* panic, we don't know what happened */
118			p_error("Unexpected error from select");
119			quit();
120		}
121		if (FD_ISSET(sockt, &read_set)) {
122			/* There is data on sockt */
123			nb = read(sockt, buf, sizeof buf);
124			if (nb <= 0) {
125				message("Connection closed. Exiting");
126				quit();
127			}
128			display(&his_win, buf, nb);
129		}
130		if (FD_ISSET(fileno(stdin), &read_set)) {
131			/*
132			 * We can't make the tty non_blocking, because
133			 * curses's output routines would screw up
134			 */
135			int i;
136			ioctl(0, FIONREAD, (void *) &nb);
137			if (nb > (ssize_t)(sizeof buf))
138				nb = sizeof buf;
139			nb = read(STDIN_FILENO, buf, nb);
140			display(&my_win, buf, nb);
141			/* might lose data here because sockt is non-blocking */
142			for (i = 0; i < nb; ++i)
143				if (buf[i] == '\r')
144					buf[i] = '\n';
145			write(sockt, buf, nb);
146		}
147	}
148}
149
150/*
151 * p_error prints the system error message on the standard location
152 * on the screen and then exits. (i.e. a curses version of perror)
153 */
154void
155p_error(const char *string)
156{
157	wmove(my_win.x_win, current_line, 0);
158	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
159	    string, strerror(errno), errno);
160	wrefresh(my_win.x_win);
161	move(LINES-1, 0);
162	refresh();
163	quit();
164}
165
166/*
167 * Display string in the standard location
168 */
169void
170message(const char *string)
171{
172	wmove(my_win.x_win, current_line, 0);
173	wprintw(my_win.x_win, "[%s]\n", string);
174	if (current_line < my_win.x_nlines - 1)
175		current_line++;
176	wrefresh(my_win.x_win);
177}