2 * Copyright (c) 1983, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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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
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29 * @(#)io.c 8.1 (Berkeley) 6/6/93
30 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $
34 * This file contains the I/O handling and the exchange of
35 * edit characters. This connection itself is established in
43 #include <sys/filio.h>
47 #define A_LONG_TIME 10000000
50 * The routine to do the actual talking
55 struct hostent *hp, *hp2;
57 fd_set read_set, read_template;
58 char buf[BUFSIZ], **addr, *his_machine_name;
61 his_machine_name = NULL;
62 hp = gethostbyaddr(&his_machine_addr.s_addr,
63 sizeof(his_machine_addr.s_addr), AF_INET);
65 hp2 = gethostbyname(hp->h_name);
66 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
67 hp2->h_length == sizeof(his_machine_addr))
68 for (addr = hp2->h_addr_list; *addr != NULL; addr++)
69 if (memcmp(*addr, &his_machine_addr,
70 sizeof(his_machine_addr)) == 0) {
71 his_machine_name = strdup(hp->h_name);
75 if (his_machine_name == NULL)
76 his_machine_name = strdup(inet_ntoa(his_machine_addr));
77 snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
78 msg.r_name, his_machine_name);
79 free(his_machine_name);
81 write(STDOUT_FILENO, "\007\007\007", 3);
86 * Wait on both the other process (sockt_mask) and
87 * standard input ( STDIN_MASK )
89 FD_ZERO(&read_template);
90 FD_SET(sockt, &read_template);
91 FD_SET(fileno(stdin), &read_template);
93 read_set = read_template;
94 wait.tv_sec = A_LONG_TIME;
96 nb = select(32, &read_set, 0, 0, &wait);
99 read_set = read_template;
102 /* panic, we don't know what happened */
103 p_error("Unexpected error from select");
106 if (FD_ISSET(sockt, &read_set)) {
107 /* There is data on sockt */
108 nb = read(sockt, buf, sizeof buf);
110 message("Connection closed. Exiting");
113 display(&his_win, buf, nb);
115 if (FD_ISSET(fileno(stdin), &read_set)) {
117 * We can't make the tty non_blocking, because
118 * curses's output routines would screw up
121 ioctl(0, FIONREAD, (struct sgttyb *) &nb);
122 nb = read(0, buf, nb);
123 display(&my_win, buf, nb);
124 /* might lose data here because sockt is non-blocking */
125 for (i = 0; i < nb; ++i)
128 write(sockt, buf, nb);
134 * p_error prints the system error message on the standard location
135 * on the screen and then exits. (i.e. a curses version of perror)
138 p_error(const char *string)
140 wmove(my_win.x_win, current_line, 0);
141 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
142 string, strerror(errno), errno);
143 wrefresh(my_win.x_win);
150 * Display string in the standard location
153 message(const char *string)
155 wmove(my_win.x_win, current_line, 0);
156 wprintw(my_win.x_win, "[%s]\n", string);
157 if (current_line < my_win.x_nlines - 1)
159 wrefresh(my_win.x_win);