Annotation of src/usr.bin/talk/io.c, Revision 1.16
1.16 ! deraadt 1: /* $OpenBSD: io.c,v 1.15 2004/03/02 21:04:42 tedu Exp $ */
1.1 deraadt 2: /* $NetBSD: io.c,v 1.4 1994/12/09 02:14:20 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1983, 1993
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.12 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #ifndef lint
34: #if 0
35: static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93";
36: #endif
1.16 ! deraadt 37: static const char rcsid[] = "$OpenBSD: io.c,v 1.15 2004/03/02 21:04:42 tedu Exp $";
1.1 deraadt 38: #endif /* not lint */
39:
40: /*
1.7 millert 41: * This file contains the I/O handling and the exchange of
1.1 deraadt 42: * edit characters. This connection itself is established in
43: * ctl.c
44: */
45:
1.5 pjanzen 46: #include "talk.h"
1.1 deraadt 47: #include <sys/ioctl.h>
48: #include <sys/time.h>
49: #include <stdio.h>
1.14 deraadt 50: #include <poll.h>
1.1 deraadt 51: #include <errno.h>
1.5 pjanzen 52: #include <unistd.h>
1.1 deraadt 53:
1.14 deraadt 54: #define A_LONG_TIME 1000000
1.1 deraadt 55:
1.11 millert 56: volatile sig_atomic_t gotwinch = 0;
57:
1.1 deraadt 58: /*
59: * The routine to do the actual talking
60: */
1.5 pjanzen 61: void
1.13 deraadt 62: talk(void)
1.1 deraadt 63: {
1.14 deraadt 64: struct pollfd fds[2];
65: char buf[BUFSIZ];
1.5 pjanzen 66: int nb;
1.1 deraadt 67:
1.7 millert 68: #if defined(NCURSES_VERSION) || defined(beep)
1.2 tholo 69: message("Connection established");
70: beep();
71: beep();
72: beep();
73: #else
1.1 deraadt 74: message("Connection established\007\007\007");
1.2 tholo 75: #endif
1.1 deraadt 76: current_line = 0;
77:
78: /*
1.7 millert 79: * Wait on both the other process (sockt_mask) and
1.1 deraadt 80: * standard input ( STDIN_MASK )
81: */
1.14 deraadt 82: fds[0].fd = fileno(stdin);
83: fds[0].events = POLLIN;
84: fds[1].fd = sockt;
85: fds[1].events = POLLIN;
86:
1.1 deraadt 87: for (;;) {
1.14 deraadt 88: nb = poll(fds, 2, A_LONG_TIME * 1000);
1.11 millert 89: if (gotwinch) {
90: resize_display();
91: gotwinch = 0;
92: }
1.1 deraadt 93: if (nb <= 0) {
1.14 deraadt 94: if (errno == EINTR)
1.1 deraadt 95: continue;
96: /* panic, we don't know what happened */
1.9 millert 97: quit("Unexpected error from select", 1);
1.1 deraadt 98: }
1.14 deraadt 99: if (fds[1].revents & POLLIN) {
1.1 deraadt 100: /* There is data on sockt */
101: nb = read(sockt, buf, sizeof buf);
1.9 millert 102: if (nb <= 0)
103: quit("Connection closed. Exiting", 0);
1.1 deraadt 104: display(&his_win, buf, nb);
105: }
1.14 deraadt 106: if (fds[0].revents & POLLIN) {
1.1 deraadt 107: /*
108: * We can't make the tty non_blocking, because
109: * curses's output routines would screw up
110: */
1.6 millert 111: ioctl(0, FIONREAD, &nb);
1.16 ! deraadt 112: nb = read(STDIN_FILENO, buf, nb);
1.1 deraadt 113: display(&my_win, buf, nb);
114: /* might lose data here because sockt is non-blocking */
115: write(sockt, buf, nb);
116: }
117: }
118: }
119:
120: /*
121: * Display string in the standard location
122: */
1.5 pjanzen 123: void
1.13 deraadt 124: message(char *string)
1.1 deraadt 125: {
126: wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
127: wprintw(my_win.x_win, "[%s]", string);
128: wclrtoeol(my_win.x_win);
129: current_line++;
130: wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
131: wrefresh(my_win.x_win);
132: }
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