1 /* 2 * Copyright (c) 1983, 1993 3 * The Regents of the University of California. 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 8.1 (Berkeley) 6/6/93"; 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/ioctl.h> 45 #include <sys/time.h> 46 #include <stdio.h> 47 #include <errno.h> 48 #include <string.h> 49 #include "talk.h" 50 51 #define A_LONG_TIME 10000000 52 53 /* 54 * The routine to do the actual talking 55 */ 56 void 57 talk() 58 { 59 int nb; 60 fd_set read_set, read_template; 61 char buf[BUFSIZ]; 62 struct timeval wait; 63 64 message("Connection established"); 65 write(STDOUT_FILENO, "\007\007\007", 3); 66 67 current_line = 0; 68 69 /* 70 * Wait on both the other process (sockt_mask) and 71 * standard input ( STDIN_MASK ) 72 */ 73 FD_ZERO(&read_template); 74 FD_SET(sockt, &read_template); 75 FD_SET(fileno(stdin), &read_template); 76 for (;;) { 77 read_set = read_template; 78 wait.tv_sec = A_LONG_TIME; 79 wait.tv_usec = 0; 80 nb = select(32, &read_set, 0, 0, &wait); 81 if (nb <= 0) { 82 if (errno == EINTR) { 83 read_set = read_template; 84 continue; 85 } 86 /* panic, we don't know what happened */ 87 p_error("Unexpected error from select"); 88 quit(); 89 } 90 if (FD_ISSET(sockt, &read_set)) { 91 /* There is data on sockt */ 92 nb = read(sockt, buf, sizeof buf); 93 if (nb <= 0) { 94 message("Connection closed. Exiting"); 95 quit(); 96 } 97 display(&his_win, buf, nb); 98 } 99 if (FD_ISSET(fileno(stdin), &read_set)) { 100 /* 101 * We can't make the tty non_blocking, because 102 * curses's output routines would screw up 103 */ 104 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 105 nb = read(0, 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 extern int errno; 114 extern int sys_nerr; 115 116 /* 117 * p_error prints the system error message on the standard location 118 * on the screen and then exits. (i.e. a curses version of perror) 119 */ 120 void 121 p_error(string) 122 char *string; 123 { 124 wmove(my_win.x_win, current_line, 0); 125 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 126 string, strerror(errno), errno); 127 wrefresh(my_win.x_win); 128 move(LINES-1, 0); 129 refresh(); 130 quit(); 131 } 132 133 /* 134 * Display string in the standard location 135 */ 136 void 137 message(string) 138 char *string; 139 { 140 wmove(my_win.x_win, current_line, 0); 141 wprintw(my_win.x_win, "[%s]\n", string); 142 if (current_line < my_win.x_nlines - 1) 143 current_line++; 144 wrefresh(my_win.x_win); 145 } 146