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[] = "@(#)io.c 5.6 (Berkeley) 3/1/91"; 36 #endif /* not lint */ 37 38 /* 39 * This file contains the I/O handling and the exchange of 40 * edit characters. This connection itself is established in 41 * ctl.c 42 */ 43 44 #include <sys/time.h> 45 #include "talk.h" 46 #include <stdio.h> 47 #include <errno.h> 48 #include <string.h> 49 50 #define A_LONG_TIME 10000000 51 #define STDIN_MASK (1<<fileno(stdin)) /* the bit mask for standard 52 input */ 53 54 /* 55 * The routine to do the actual talking 56 */ 57 talk() 58 { 59 register int read_template, sockt_mask; 60 int read_set, nb; 61 char buf[BUFSIZ]; 62 struct timeval wait; 63 64 message("Connection established\007\007\007"); 65 current_line = 0; 66 sockt_mask = (1<<sockt); 67 68 /* 69 * Wait on both the other process (sockt_mask) and 70 * standard input ( STDIN_MASK ) 71 */ 72 read_template = sockt_mask | STDIN_MASK; 73 for (;;) { 74 read_set = read_template; 75 wait.tv_sec = A_LONG_TIME; 76 wait.tv_usec = 0; 77 nb = select(32, &read_set, 0, 0, &wait); 78 if (nb <= 0) { 79 if (errno == EINTR) { 80 read_set = read_template; 81 continue; 82 } 83 /* panic, we don't know what happened */ 84 p_error("Unexpected error from select"); 85 quit(); 86 } 87 if (read_set & sockt_mask) { 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 (read_set & STDIN_MASK) { 97 /* 98 * We can't make the tty non_blocking, because 99 * curses's output routines would screw up 100 */ 101 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 102 nb = read(0, buf, nb); 103 display(&my_win, buf, nb); 104 /* might lose data here because sockt is non-blocking */ 105 write(sockt, buf, nb); 106 } 107 } 108 } 109 110 extern int errno; 111 extern int sys_nerr; 112 113 /* 114 * p_error prints the system error message on the standard location 115 * on the screen and then exits. (i.e. a curses version of perror) 116 */ 117 p_error(string) 118 char *string; 119 { 120 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 121 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 122 string, strerror(errno), errno); 123 wrefresh(my_win.x_win); 124 move(LINES-1, 0); 125 refresh(); 126 quit(); 127 } 128 129 /* 130 * Display string in the standard location 131 */ 132 message(string) 133 char *string; 134 { 135 136 wmove(my_win.x_win, current_line%my_win.x_nlines, 0); 137 wprintw(my_win.x_win, "[%s]\n", string); 138 wrefresh(my_win.x_win); 139 } 140