1 /* $NetBSD: io.c,v 1.5 1997/10/20 00:23:24 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 #if 0 39 static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 40 #endif 41 __RCSID("$NetBSD: io.c,v 1.5 1997/10/20 00:23:24 lukem Exp $"); 42 #endif /* not lint */ 43 44 /* 45 * This file contains the I/O handling and the exchange of 46 * edit characters. This connection itself is established in 47 * ctl.c 48 */ 49 50 #include "talk.h" 51 #include <sys/ioctl.h> 52 #include <sys/time.h> 53 #include <stdio.h> 54 #include <errno.h> 55 #include <string.h> 56 #include <unistd.h> 57 58 #define A_LONG_TIME 10000000 59 60 /* 61 * The routine to do the actual talking 62 */ 63 void 64 talk() 65 { 66 fd_set read_template, read_set; 67 int nb; 68 char buf[BUFSIZ]; 69 struct timeval wait; 70 71 message("Connection established\007\007\007"); 72 current_line = 0; 73 74 /* 75 * Wait on both the other process (sockt_mask) and 76 * standard input ( STDIN_MASK ) 77 */ 78 FD_ZERO(&read_template); 79 FD_SET(sockt, &read_template); 80 FD_SET(fileno(stdin), &read_template); 81 for (;;) { 82 read_set = read_template; 83 wait.tv_sec = A_LONG_TIME; 84 wait.tv_usec = 0; 85 nb = select(32, &read_set, 0, 0, &wait); 86 if (nb <= 0) { 87 if (errno == EINTR) { 88 read_set = read_template; 89 continue; 90 } 91 /* panic, we don't know what happened */ 92 p_error("Unexpected error from select"); 93 quit(); 94 } 95 if (FD_ISSET(sockt, &read_set)) { 96 /* There is data on sockt */ 97 nb = read(sockt, buf, sizeof buf); 98 if (nb <= 0) { 99 message("Connection closed. Exiting"); 100 quit(); 101 } 102 display(&his_win, buf, nb); 103 } 104 if (FD_ISSET(fileno(stdin), &read_set)) { 105 /* 106 * We can't make the tty non_blocking, because 107 * curses's output routines would screw up 108 */ 109 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 110 nb = read(0, buf, nb); 111 display(&my_win, buf, nb); 112 /* might lose data here because sockt is non-blocking */ 113 write(sockt, buf, nb); 114 } 115 } 116 } 117 118 /* 119 * p_error prints the system error message on the standard location 120 * on the screen and then exits. (i.e. a curses version of perror) 121 */ 122 void 123 p_error(string) 124 char *string; 125 { 126 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 127 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 128 string, strerror(errno), errno); 129 wrefresh(my_win.x_win); 130 move(LINES-1, 0); 131 refresh(); 132 quit(); 133 } 134 135 /* 136 * Display string in the standard location 137 */ 138 void 139 message(string) 140 char *string; 141 { 142 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 143 wprintw(my_win.x_win, "[%s]", string); 144 wclrtoeol(my_win.x_win); 145 current_line++; 146 wmove(my_win.x_win, current_line % my_win.x_nlines, 0); 147 wrefresh(my_win.x_win); 148 } 149