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
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
30 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
35 static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
39 * This file contains the I/O handling and the exchange of
40 * edit characters. This connection itself is established in
44 #include <sys/filio.h>
56 #define A_LONG_TIME 10000000
58 volatile sig_atomic_t gotwinch = 0;
61 * The routine to do the actual talking
66 struct hostent *hp, *hp2;
68 fd_set read_set, read_template;
69 char buf[BUFSIZ], **addr, *his_machine_name;
72 his_machine_name = NULL;
73 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
74 sizeof(his_machine_addr.s_addr), AF_INET);
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);
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);
92 write(STDOUT_FILENO, "\007\007\007", 3);
97 * Wait on both the other process (sockt_mask) and
98 * standard input ( STDIN_MASK )
100 FD_ZERO(&read_template);
101 FD_SET(sockt, &read_template);
102 FD_SET(fileno(stdin), &read_template);
104 read_set = read_template;
105 wait.tv_sec = A_LONG_TIME;
107 nb = select(32, &read_set, 0, 0, &wait);
113 if (errno == EINTR) {
114 read_set = read_template;
117 /* panic, we don't know what happened */
118 p_error("Unexpected error from select");
121 if (FD_ISSET(sockt, &read_set)) {
122 /* There is data on sockt */
123 nb = read(sockt, buf, sizeof buf);
125 message("Connection closed. Exiting");
128 display(&his_win, buf, nb);
130 if (FD_ISSET(fileno(stdin), &read_set)) {
132 * We can't make the tty non_blocking, because
133 * curses's output routines would screw up
136 ioctl(0, FIONREAD, (void *) &nb);
137 if (nb > (ssize_t)(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)
145 write(sockt, buf, nb);
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)
155 p_error(const char *string)
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);
167 * Display string in the standard location
170 message(const char *string)
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)
176 wrefresh(my_win.x_win);