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
33 * @(#)io.c 8.1 (Berkeley) 6/6/93
34 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $
35 * $DragonFly: src/usr.bin/talk/io.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
39 * This file contains the I/O handling and the exchange of
40 * edit characters. This connection itself is established in
48 #include <sys/filio.h>
52 #define A_LONG_TIME 10000000
55 * The routine to do the actual talking
60 struct hostent
*hp
, *hp2
;
62 fd_set read_set
, read_template
;
63 char buf
[BUFSIZ
], **addr
, *his_machine_name
;
66 his_machine_name
= NULL
;
67 hp
= gethostbyaddr(&his_machine_addr
.s_addr
,
68 sizeof(his_machine_addr
.s_addr
), AF_INET
);
70 hp2
= gethostbyname(hp
->h_name
);
71 if (hp2
!= NULL
&& hp2
->h_addrtype
== AF_INET
&&
72 hp2
->h_length
== sizeof(his_machine_addr
))
73 for (addr
= hp2
->h_addr_list
; *addr
!= NULL
; addr
++)
74 if (memcmp(*addr
, &his_machine_addr
,
75 sizeof(his_machine_addr
)) == 0) {
76 his_machine_name
= strdup(hp
->h_name
);
80 if (his_machine_name
== NULL
)
81 his_machine_name
= strdup(inet_ntoa(his_machine_addr
));
82 snprintf(buf
, sizeof(buf
), "Connection established with %s@%s.",
83 msg
.r_name
, his_machine_name
);
84 free(his_machine_name
);
86 write(STDOUT_FILENO
, "\007\007\007", 3);
91 * Wait on both the other process (sockt_mask) and
92 * standard input ( STDIN_MASK )
94 FD_ZERO(&read_template
);
95 FD_SET(sockt
, &read_template
);
96 FD_SET(fileno(stdin
), &read_template
);
98 read_set
= read_template
;
99 wait
.tv_sec
= A_LONG_TIME
;
101 nb
= select(32, &read_set
, 0, 0, &wait
);
103 if (errno
== EINTR
) {
104 read_set
= read_template
;
107 /* panic, we don't know what happened */
108 p_error("Unexpected error from select");
111 if (FD_ISSET(sockt
, &read_set
)) {
112 /* There is data on sockt */
113 nb
= read(sockt
, buf
, sizeof buf
);
115 message("Connection closed. Exiting");
118 display(&his_win
, buf
, nb
);
120 if (FD_ISSET(fileno(stdin
), &read_set
)) {
122 * We can't make the tty non_blocking, because
123 * curses's output routines would screw up
126 ioctl(0, FIONREAD
, (struct sgttyb
*) &nb
);
127 nb
= read(0, buf
, nb
);
128 display(&my_win
, buf
, nb
);
129 /* might lose data here because sockt is non-blocking */
130 for (i
= 0; i
< nb
; ++i
)
133 write(sockt
, buf
, nb
);
139 * p_error prints the system error message on the standard location
140 * on the screen and then exits. (i.e. a curses version of perror)
143 p_error(char *string
)
145 wmove(my_win
.x_win
, current_line
, 0);
146 wprintw(my_win
.x_win
, "[%s : %s (%d)]\n",
147 string
, strerror(errno
), errno
);
148 wrefresh(my_win
.x_win
);
155 * Display string in the standard location
158 message(char *string
)
160 wmove(my_win
.x_win
, current_line
, 0);
161 wprintw(my_win
.x_win
, "[%s]\n", string
);
162 if (current_line
< my_win
.x_nlines
- 1)
164 wrefresh(my_win
.x_win
);