1 /* $OpenBSD: io.c,v 1.16 2005/04/13 02:33:08 deraadt Exp $ */ 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. 16 * 3. Neither the name of the University nor the names of its contributors 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 37 static const char rcsid[] = "$OpenBSD: io.c,v 1.16 2005/04/13 02:33:08 deraadt 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 <poll.h> 51 #include <errno.h> 52 #include <unistd.h> 53 54 #define A_LONG_TIME 1000000 55 56 volatile sig_atomic_t gotwinch = 0; 57 58 /* 59 * The routine to do the actual talking 60 */ 61 void 62 talk(void) 63 { 64 struct pollfd fds[2]; 65 char buf[BUFSIZ]; 66 int nb; 67 68 #if defined(NCURSES_VERSION) || defined(beep) 69 message("Connection established"); 70 beep(); 71 beep(); 72 beep(); 73 #else 74 message("Connection established\007\007\007"); 75 #endif 76 current_line = 0; 77 78 /* 79 * Wait on both the other process (sockt_mask) and 80 * standard input ( STDIN_MASK ) 81 */ 82 fds[0].fd = fileno(stdin); 83 fds[0].events = POLLIN; 84 fds[1].fd = sockt; 85 fds[1].events = POLLIN; 86 87 for (;;) { 88 nb = poll(fds, 2, A_LONG_TIME * 1000); 89 if (gotwinch) { 90 resize_display(); 91 gotwinch = 0; 92 } 93 if (nb <= 0) { 94 if (errno == EINTR) 95 continue; 96 /* panic, we don't know what happened */ 97 quit("Unexpected error from select", 1); 98 } 99 if (fds[1].revents & POLLIN) { 100 /* There is data on sockt */ 101 nb = read(sockt, buf, sizeof buf); 102 if (nb <= 0) 103 quit("Connection closed. Exiting", 0); 104 display(&his_win, buf, nb); 105 } 106 if (fds[0].revents & POLLIN) { 107 /* 108 * We can't make the tty non_blocking, because 109 * curses's output routines would screw up 110 */ 111 ioctl(0, FIONREAD, &nb); 112 nb = read(STDIN_FILENO, buf, nb); 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 */ 123 void 124 message(char *string) 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 } 133