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 #if 0 36 static char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 37 #endif 38 static const char rcsid[] = 39 "$FreeBSD$"; 40 #endif /* not lint */ 41 42 /* 43 * This file contains the I/O handling and the exchange of 44 * edit characters. This connection itself is established in 45 * ctl.c 46 */ 47 48 #include <errno.h> 49 #include <string.h> 50 #include <sys/filio.h> 51 #include <unistd.h> 52 #include "talk.h" 53 54 #define A_LONG_TIME 10000000 55 56 /* 57 * The routine to do the actual talking 58 */ 59 void 60 talk() 61 { 62 int nb; 63 fd_set read_set, read_template; 64 char buf[BUFSIZ]; 65 struct timeval wait; 66 67 message("Connection established"); 68 write(STDOUT_FILENO, "\007\007\007", 3); 69 70 current_line = 0; 71 72 /* 73 * Wait on both the other process (sockt_mask) and 74 * standard input ( STDIN_MASK ) 75 */ 76 FD_ZERO(&read_template); 77 FD_SET(sockt, &read_template); 78 FD_SET(fileno(stdin), &read_template); 79 for (;;) { 80 read_set = read_template; 81 wait.tv_sec = A_LONG_TIME; 82 wait.tv_usec = 0; 83 nb = select(32, &read_set, 0, 0, &wait); 84 if (nb <= 0) { 85 if (errno == EINTR) { 86 read_set = read_template; 87 continue; 88 } 89 /* panic, we don't know what happened */ 90 p_error("Unexpected error from select"); 91 quit(); 92 } 93 if (FD_ISSET(sockt, &read_set)) { 94 /* There is data on sockt */ 95 nb = read(sockt, buf, sizeof buf); 96 if (nb <= 0) { 97 message("Connection closed. Exiting"); 98 quit(); 99 } 100 display(&his_win, buf, nb); 101 } 102 if (FD_ISSET(fileno(stdin), &read_set)) { 103 /* 104 * We can't make the tty non_blocking, because 105 * curses's output routines would screw up 106 */ 107 int i; 108 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 109 nb = read(STDIN_FILENO, buf, nb); 110 display(&my_win, buf, nb); 111 /* might lose data here because sockt is non-blocking */ 112 for (i = 0; i < nb; ++i) 113 if (buf[i] == '\r') 114 buf[i] = '\n'; 115 write(sockt, buf, nb); 116 } 117 } 118 } 119 120 /* 121 * p_error prints the system error message on the standard location 122 * on the screen and then exits. (i.e. a curses version of perror) 123 */ 124 void 125 p_error(string) 126 char *string; 127 { 128 wmove(my_win.x_win, current_line, 0); 129 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 130 string, strerror(errno), errno); 131 wrefresh(my_win.x_win); 132 move(LINES-1, 0); 133 refresh(); 134 quit(); 135 } 136 137 /* 138 * Display string in the standard location 139 */ 140 void 141 message(string) 142 char *string; 143 { 144 wmove(my_win.x_win, current_line, 0); 145 wprintw(my_win.x_win, "[%s]\n", string); 146 if (current_line < my_win.x_nlines - 1) 147 current_line++; 148 wrefresh(my_win.x_win); 149 } 150