1 /* $OpenBSD: io.c,v 1.13 2003/06/10 22:20:53 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 char rcsid[] = "$OpenBSD: io.c,v 1.13 2003/06/10 22:20:53 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 <errno.h> 51 #include <unistd.h> 52 53 #define A_LONG_TIME 10000000 54 55 volatile sig_atomic_t gotwinch = 0; 56 57 /* 58 * The routine to do the actual talking 59 */ 60 void 61 talk(void) 62 { 63 fd_set read_template, read_set; 64 int nb; 65 char buf[BUFSIZ]; 66 struct timeval wait; 67 int maxfd = 0; 68 69 #if defined(NCURSES_VERSION) || defined(beep) 70 message("Connection established"); 71 beep(); 72 beep(); 73 beep(); 74 #else 75 message("Connection established\007\007\007"); 76 #endif 77 current_line = 0; 78 79 /* 80 * Wait on both the other process (sockt_mask) and 81 * standard input ( STDIN_MASK ) 82 */ 83 FD_ZERO(&read_template); 84 FD_SET(fileno(stdin), &read_template); 85 if (fileno(stdin) > maxfd) 86 maxfd = fileno(stdin); 87 FD_SET(sockt, &read_template); 88 if (sockt > maxfd) 89 maxfd = sockt; 90 for (;;) { 91 read_set = read_template; 92 wait.tv_sec = A_LONG_TIME; 93 wait.tv_usec = 0; 94 nb = select(maxfd + 1, &read_set, 0, 0, &wait); 95 if (gotwinch) { 96 resize_display(); 97 gotwinch = 0; 98 } 99 if (nb <= 0) { 100 if (errno == EINTR) { 101 read_set = read_template; 102 continue; 103 } 104 /* panic, we don't know what happened */ 105 quit("Unexpected error from select", 1); 106 } 107 if (FD_ISSET(sockt, &read_set)) { 108 /* There is data on sockt */ 109 nb = read(sockt, buf, sizeof buf); 110 if (nb <= 0) 111 quit("Connection closed. Exiting", 0); 112 display(&his_win, buf, nb); 113 } 114 if (FD_ISSET(fileno(stdin), &read_set)) { 115 /* 116 * We can't make the tty non_blocking, because 117 * curses's output routines would screw up 118 */ 119 ioctl(0, FIONREAD, &nb); 120 nb = read(0, buf, nb); 121 display(&my_win, buf, nb); 122 /* might lose data here because sockt is non-blocking */ 123 write(sockt, buf, nb); 124 } 125 } 126 } 127 128 /* 129 * Display string in the standard location 130 */ 131 void 132 message(char *string) 133 { 134 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 135 wprintw(my_win.x_win, "[%s]", string); 136 wclrtoeol(my_win.x_win); 137 current_line++; 138 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 139 wrefresh(my_win.x_win); 140 } 141