1 /* $OpenBSD: io.c,v 1.20 2016/02/18 21:51:20 espie 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 /* 34 * This file contains the I/O handling and the exchange of 35 * edit characters. This connection itself is established in 36 * ctl.c 37 */ 38 39 #include <sys/ioctl.h> 40 41 #include <errno.h> 42 #include <poll.h> 43 #include <unistd.h> 44 45 #include "talk.h" 46 47 #define A_LONG_TIME 1000000 48 49 volatile sig_atomic_t gotwinch; 50 51 /* 52 * The routine to do the actual talking 53 */ 54 void 55 talk(void) 56 { 57 struct pollfd fds[2]; 58 char buf[BUFSIZ]; 59 int nb; 60 61 #if defined(NCURSES_VERSION) || defined(beep) 62 message("Connection established"); 63 beep(); 64 beep(); 65 beep(); 66 #else 67 message("Connection established\007\007\007"); 68 #endif 69 current_line = 0; 70 71 /* 72 * Wait on both the other process (sockt_mask) and 73 * standard input ( STDIN_MASK ) 74 */ 75 fds[0].fd = fileno(stdin); 76 fds[0].events = POLLIN; 77 fds[1].fd = sockt; 78 fds[1].events = POLLIN; 79 80 for (;;) { 81 nb = poll(fds, 2, A_LONG_TIME * 1000); 82 if (gotwinch) { 83 resize_display(); 84 gotwinch = 0; 85 } 86 if (nb <= 0) { 87 if (errno == EINTR) 88 continue; 89 /* panic, we don't know what happened */ 90 quit("Unexpected error from poll", 1); 91 } 92 if (fds[1].revents & POLLIN) { 93 /* There is data on sockt */ 94 nb = read(sockt, buf, sizeof buf); 95 if (nb <= 0) 96 quit("Connection closed. Exiting", 0); 97 display(&his_win, buf, nb); 98 } 99 if (fds[0].revents & POLLIN) { 100 /* 101 * We can't make the tty non_blocking, because 102 * curses's output routines would screw up 103 */ 104 ioctl(0, FIONREAD, &nb); 105 nb = read(STDIN_FILENO, buf, nb); 106 display(&my_win, buf, nb); 107 /* might lose data here because sockt is non-blocking */ 108 write(sockt, buf, nb); 109 } 110 } 111 } 112 113 /* 114 * Display string in the standard location 115 */ 116 void 117 message(char *string) 118 { 119 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 120 wprintw(my_win.x_win, "[%s]", string); 121 wclrtoeol(my_win.x_win); 122 current_line++; 123 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 124 wrefresh(my_win.x_win); 125 } 126