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984263bc MD |
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. | |
dc71b7ab | 13 | * 3. Neither the name of the University nor the names of its contributors |
984263bc MD |
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. | |
1de703da MD |
28 | * |
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 $ | |
984263bc MD |
31 | */ |
32 | ||
984263bc MD |
33 | /* |
34 | * This file contains the I/O handling and the exchange of | |
35 | * edit characters. This connection itself is established in | |
36 | * ctl.c | |
37 | */ | |
38 | ||
39 | #include <errno.h> | |
40 | #include <netdb.h> | |
41 | #include <stdlib.h> | |
42 | #include <string.h> | |
43 | #include <sys/filio.h> | |
44 | #include "talk.h" | |
45 | #include "talk_ctl.h" | |
46 | ||
47 | #define A_LONG_TIME 10000000 | |
48 | ||
49 | /* | |
50 | * The routine to do the actual talking | |
51 | */ | |
52 | void | |
1d1731fa | 53 | talk(void) |
984263bc MD |
54 | { |
55 | struct hostent *hp, *hp2; | |
56 | int nb; | |
57 | fd_set read_set, read_template; | |
58 | char buf[BUFSIZ], **addr, *his_machine_name; | |
59 | struct timeval wait; | |
60 | ||
61 | his_machine_name = NULL; | |
15b85273 | 62 | hp = gethostbyaddr(&his_machine_addr.s_addr, |
984263bc MD |
63 | sizeof(his_machine_addr.s_addr), AF_INET); |
64 | if (hp != NULL) { | |
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); | |
72 | break; | |
73 | } | |
74 | } | |
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); | |
80 | message(buf); | |
81 | write(STDOUT_FILENO, "\007\007\007", 3); | |
82 | ||
83 | current_line = 0; | |
84 | ||
85 | /* | |
86 | * Wait on both the other process (sockt_mask) and | |
87 | * standard input ( STDIN_MASK ) | |
88 | */ | |
89 | FD_ZERO(&read_template); | |
90 | FD_SET(sockt, &read_template); | |
91 | FD_SET(fileno(stdin), &read_template); | |
92 | for (;;) { | |
93 | read_set = read_template; | |
94 | wait.tv_sec = A_LONG_TIME; | |
95 | wait.tv_usec = 0; | |
96 | nb = select(32, &read_set, 0, 0, &wait); | |
97 | if (nb <= 0) { | |
98 | if (errno == EINTR) { | |
99 | read_set = read_template; | |
100 | continue; | |
101 | } | |
102 | /* panic, we don't know what happened */ | |
103 | p_error("Unexpected error from select"); | |
104 | quit(); | |
105 | } | |
106 | if (FD_ISSET(sockt, &read_set)) { | |
107 | /* There is data on sockt */ | |
108 | nb = read(sockt, buf, sizeof buf); | |
109 | if (nb <= 0) { | |
110 | message("Connection closed. Exiting"); | |
111 | quit(); | |
112 | } | |
113 | display(&his_win, buf, nb); | |
114 | } | |
115 | if (FD_ISSET(fileno(stdin), &read_set)) { | |
116 | /* | |
117 | * We can't make the tty non_blocking, because | |
118 | * curses's output routines would screw up | |
119 | */ | |
120 | int i; | |
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) | |
126 | if (buf[i] == '\r') | |
127 | buf[i] = '\n'; | |
128 | write(sockt, buf, nb); | |
129 | } | |
130 | } | |
131 | } | |
132 | ||
133 | /* | |
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) | |
136 | */ | |
137 | void | |
e2daa382 | 138 | p_error(const char *string) |
984263bc MD |
139 | { |
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); | |
144 | move(LINES-1, 0); | |
145 | refresh(); | |
146 | quit(); | |
147 | } | |
148 | ||
149 | /* | |
150 | * Display string in the standard location | |
151 | */ | |
152 | void | |
e2daa382 | 153 | message(const char *string) |
984263bc MD |
154 | { |
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) | |
158 | current_line++; | |
159 | wrefresh(my_win.x_win); | |
160 | } |