1 /* 2 * Copyright (c) 1983 Regents of the University of California. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #ifndef lint 35 /*static char sccsid[] = "from: @(#)io.c 5.6 (Berkeley) 3/1/91";*/ 36 static char rcsid[] = "$Id: io.c,v 1.3 1993/08/14 13:47:51 mycroft Exp $"; 37 #endif /* not lint */ 38 39 /* 40 * This file contains the I/O handling and the exchange of 41 * edit characters. This connection itself is established in 42 * ctl.c 43 */ 44 45 #include <sys/time.h> 46 #include <sys/ioctl.h> 47 #include "talk.h" 48 #include <stdio.h> 49 #include <errno.h> 50 #include <string.h> 51 52 #define A_LONG_TIME 10000000 53 #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard 54 input */ 55 56 /* 57 * The routine to do the actual talking 58 */ 59 talk() 60 { 61 register int read_template, sockt_mask; 62 int read_set, nb; 63 char buf[BUFSIZ]; 64 struct timeval wait; 65 66 message("Connection established\007\007\007"); 67 current_line = 0; 68 sockt_mask = (1<<sockt); 69 70 /* 71 * Wait on both the other process (sockt_mask) and 72 * standard input ( STDIN_MASK ) 73 */ 74 read_template = sockt_mask | STDIN_MASK; 75 for (;;) { 76 read_set = read_template; 77 wait.tv_sec = A_LONG_TIME; 78 wait.tv_usec = 0; 79 nb = select(32, &read_set, 0, 0, &wait); 80 if (nb <= 0) { 81 if (errno == EINTR) { 82 read_set = read_template; 83 continue; 84 } 85 /* panic, we don't know what happened */ 86 p_error("Unexpected error from select"); 87 quit(); 88 } 89 if (read_set & sockt_mask) { 90 /* There is data on sockt */ 91 nb = read(sockt, buf, sizeof buf); 92 if (nb <= 0) { 93 message("Connection closed. Exiting"); 94 quit(); 95 } 96 display(&his_win, buf, nb); 97 } 98 if (read_set & STDIN_MASK) { 99 /* 100 * We can't make the tty non_blocking, because 101 * curses's output routines would screw up 102 */ 103 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 104 nb = read(0, buf, nb); 105 display(&my_win, buf, nb); 106 /* might lose data here because sockt is non-blocking */ 107 write(sockt, buf, nb); 108 } 109 } 110 } 111 112 extern int errno; 113 extern int sys_nerr; 114 115 /* 116 * p_error prints the system error message on the standard location 117 * on the screen and then exits. (i.e. a curses version of perror) 118 */ 119 p_error(string) 120 char *string; 121 { 122 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 123 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 124 string, strerror(errno), errno); 125 wrefresh(my_win.x_win); 126 move(LINES-1, 0); 127 refresh(); 128 quit(); 129 } 130 131 /* 132 * Display string in the standard location 133 */ 134 message(string) 135 char *string; 136 { 137 138 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 139 wprintw(my_win.x_win, "[%s]\n", string); 140 wrefresh(my_win.x_win); 141 } 142