1 /*        $NetBSD: io.c,v 1.14 2011/09/06 18:32:03 joerg Exp $        */
2 
3 /*
4  * Copyright (c) 1983, 1993
5  *        The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  * 1. Redistributions of source code must retain the above copyright
11  *    notice, this list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright
13  *    notice, this list of conditions and the following disclaimer in the
14  *    documentation and/or other materials provided with the distribution.
15  * 3. Neither the name of the University nor the names of its contributors
16  *    may be used to endorse or promote products derived from this software
17  *    without specific prior written permission.
18  *
19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29  * SUCH DAMAGE.
30  */
31 
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)io.c        8.1 (Berkeley) 6/6/93";
36 #endif
37 __RCSID("$NetBSD: io.c,v 1.14 2011/09/06 18:32:03 joerg Exp $");
38 #endif /* not lint */
39 
40 /*
41  * This file contains the I/O handling and the exchange of
42  * edit characters. This connection itself is established in
43  * ctl.c
44  */
45 
46 #include "talk.h"
47 #include <sys/ioctl.h>
48 #include <sys/time.h>
49 #include <stdio.h>
50 #include <errno.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <poll.h>
54 
55 #define A_LONG_TIME 1000000
56 
57 /*
58  * The routine to do the actual talking
59  */
60 void
talk(void)61 talk(void)
62 {
63           struct pollfd set[2];
64           int nb;
65           char buf[BUFSIZ];
66 
67           message("Connection established\007\007\007");
68           current_line = 0;
69 
70           /*
71            * Wait on both the other process (sockt_mask) and
72            * standard input ( STDIN_MASK )
73            */
74           set[0].fd = sockt;
75           set[0].events = POLLIN;
76           set[1].fd = fileno(stdin);
77           set[1].events = POLLIN;
78           for (;;) {
79                     nb = poll(set, 2, A_LONG_TIME * 1000);
80                     if (nb <= 0) {
81                               if (errno == EINTR)
82                                         continue;
83                               /* panic, we don't know what happened */
84                               p_error("Unexpected error from poll");
85                               quit();
86                     }
87                     if (set[0].revents & POLLIN) {
88                               /* There is data on sockt */
89                               nb = read(sockt, buf, sizeof buf);
90                               if (nb <= 0) {
91                                         message("Connection closed. Exiting");
92                                         quit();
93                               }
94                               display(&his_win, buf, nb);
95                     }
96                     if (set[1].revents & POLLIN) {
97                               /*
98                                * We can't make the tty non_blocking, because
99                                * curses's output routines would screw up
100                                */
101                               ioctl(0, FIONREAD, (void *) &nb);
102                               nb = read(0, buf, nb);
103                               display(&my_win, buf, nb);
104                               /* might lose data here because sockt is non-blocking */
105                               if (nb > 0)
106                                         write(sockt, buf, nb);
107                     }
108           }
109 }
110 
111 /*
112  * p_error prints the system error message on the standard location
113  * on the screen and then exits. (i.e. a curses version of perror)
114  */
115 void
p_error(const char * string)116 p_error(const char *string)
117 {
118           wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
119           wprintw(my_win.x_win, "[%s : %s (%d)]\n",
120               string, strerror(errno), errno);
121           wrefresh(my_win.x_win);
122           move(LINES-1, 0);
123           refresh();
124           quit();
125 }
126 
127 /*
128  * Display string in the standard location
129  */
130 void
message(const char * string)131 message(const char *string)
132 {
133           wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
134           wprintw(my_win.x_win, "[%s]", string);
135           wclrtoeol(my_win.x_win);
136           current_line++;
137           wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
138           wrefresh(my_win.x_win);
139 }
140