1 /* $NetBSD: io.c,v 1.13 2009/04/13 23:43:36 lukem 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 1.13 2009/04/13 23:43:36 lukem 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 61 talk() 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 116 p_error(string) 117 const char *string; 118 { 119 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 120 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 121 string, strerror(errno), errno); 122 wrefresh(my_win.x_win); 123 move(LINES-1, 0); 124 refresh(); 125 quit(); 126 } 127 128 /* 129 * Display string in the standard location 130 */ 131 void 132 message(string) 133 const char *string; 134 { 135 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 136 wprintw(my_win.x_win, "[%s]", string); 137 wclrtoeol(my_win.x_win); 138 current_line++; 139 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 140 wrefresh(my_win.x_win); 141 } 142