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 "$Id: io.c,v 1.6 1998/01/14 07:21:10 charnier Exp $"; 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 "talk.h" 51 52 #define A_LONG_TIME 10000000 53 54 /* 55 * The routine to do the actual talking 56 */ 57 void 58 talk() 59 { 60 int nb; 61 fd_set read_set, read_template; 62 char buf[BUFSIZ]; 63 struct timeval wait; 64 65 message("Connection established"); 66 write(STDOUT_FILENO, "\007\007\007", 3); 67 68 current_line = 0; 69 70 /* 71 * Wait on both the other process (sockt_mask) and 72 * standard input ( STDIN_MASK ) 73 */ 74 FD_ZERO(&read_template); 75 FD_SET(sockt, &read_template); 76 FD_SET(fileno(stdin), &read_template); 77 for (;;) { 78 read_set = read_template; 79 wait.tv_sec = A_LONG_TIME; 80 wait.tv_usec = 0; 81 nb = select(32, &read_set, 0, 0, &wait); 82 if (nb <= 0) { 83 if (errno == EINTR) { 84 read_set = read_template; 85 continue; 86 } 87 /* panic, we don't know what happened */ 88 p_error("Unexpected error from select"); 89 quit(); 90 } 91 if (FD_ISSET(sockt, &read_set)) { 92 /* There is data on sockt */ 93 nb = read(sockt, buf, sizeof buf); 94 if (nb <= 0) { 95 message("Connection closed. Exiting"); 96 quit(); 97 } 98 display(&his_win, buf, nb); 99 } 100 if (FD_ISSET(fileno(stdin), &read_set)) { 101 /* 102 * We can't make the tty non_blocking, because 103 * curses's output routines would screw up 104 */ 105 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 106 nb = read(0, buf, nb); 107 display(&my_win, buf, nb); 108 /* might lose data here because sockt is non-blocking */ 109 write(sockt, buf, nb); 110 } 111 } 112 } 113 114 /* 115 * p_error prints the system error message on the standard location 116 * on the screen and then exits. (i.e. a curses version of perror) 117 */ 118 void 119 p_error(string) 120 char *string; 121 { 122 wmove(my_win.x_win, current_line, 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 void 135 message(string) 136 char *string; 137 { 138 wmove(my_win.x_win, current_line, 0); 139 wprintw(my_win.x_win, "[%s]\n", string); 140 if (current_line < my_win.x_nlines - 1) 141 current_line++; 142 wrefresh(my_win.x_win); 143 } 144