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 * 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.
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
34 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
39 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
43 * This file contains the I/O handling and the exchange of
44 * edit characters. This connection itself is established in
48 #include <sys/filio.h>
60 #define A_LONG_TIME 10000000
62 volatile sig_atomic_t gotwinch = 0;
65 * The routine to do the actual talking
70 struct hostent *hp, *hp2;
72 fd_set read_set, read_template;
73 char buf[BUFSIZ], **addr, *his_machine_name;
76 his_machine_name = NULL;
77 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
78 sizeof(his_machine_addr.s_addr), AF_INET);
80 hp2 = gethostbyname(hp->h_name);
81 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
82 hp2->h_length == sizeof(his_machine_addr))
83 for (addr = hp2->h_addr_list; *addr != NULL; addr++)
84 if (memcmp(*addr, &his_machine_addr,
85 sizeof(his_machine_addr)) == 0) {
86 his_machine_name = strdup(hp->h_name);
90 if (his_machine_name == NULL)
91 his_machine_name = strdup(inet_ntoa(his_machine_addr));
92 snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
93 msg.r_name, his_machine_name);
94 free(his_machine_name);
96 write(STDOUT_FILENO, "\007\007\007", 3);
101 * Wait on both the other process (sockt_mask) and
102 * standard input ( STDIN_MASK )
104 FD_ZERO(&read_template);
105 FD_SET(sockt, &read_template);
106 FD_SET(fileno(stdin), &read_template);
108 read_set = read_template;
109 wait.tv_sec = A_LONG_TIME;
111 nb = select(32, &read_set, 0, 0, &wait);
117 if (errno == EINTR) {
118 read_set = read_template;
121 /* panic, we don't know what happened */
122 p_error("Unexpected error from select");
125 if (FD_ISSET(sockt, &read_set)) {
126 /* There is data on sockt */
127 nb = read(sockt, buf, sizeof buf);
129 message("Connection closed. Exiting");
132 display(&his_win, buf, nb);
134 if (FD_ISSET(fileno(stdin), &read_set)) {
136 * We can't make the tty non_blocking, because
137 * curses's output routines would screw up
140 ioctl(0, FIONREAD, (void *) &nb);
141 if (nb > (ssize_t)(sizeof buf))
143 nb = read(STDIN_FILENO, buf, nb);
144 display(&my_win, buf, nb);
145 /* might lose data here because sockt is non-blocking */
146 for (i = 0; i < nb; ++i)
149 write(sockt, buf, nb);
155 * p_error prints the system error message on the standard location
156 * on the screen and then exits. (i.e. a curses version of perror)
159 p_error(const char *string)
161 wmove(my_win.x_win, current_line, 0);
162 wprintw(my_win.x_win, "[%s : %s (%d)]\n",
163 string, strerror(errno), errno);
164 wrefresh(my_win.x_win);
171 * Display string in the standard location
174 message(const char *string)
176 wmove(my_win.x_win, current_line, 0);
177 wprintw(my_win.x_win, "[%s]\n", string);
178 if (current_line < my_win.x_nlines - 1)
180 wrefresh(my_win.x_win);