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\007\007\007"); 65 current_line = 0; 66 67 /* 68 * Wait on both the other process (sockt_mask) and 69 * standard input ( STDIN_MASK ) 70 */ 71 FD_ZERO(&read_template); 72 FD_SET(sockt, &read_template); 73 FD_SET(fileno(stdin), &read_template); 74 for (;;) { 75 read_set = read_template; 76 wait.tv_sec = A_LONG_TIME; 77 wait.tv_usec = 0; 78 nb = select(32, &read_set, 0, 0, &wait); 79 if (nb <= 0) { 80 if (errno == EINTR) { 81 read_set = read_template; 82 continue; 83 } 84 /* panic, we don't know what happened */ 85 p_error("Unexpected error from select"); 86 quit(); 87 } 88 if (FD_ISSET(sockt, &read_set)) { 89 /* There is data on sockt */ 90 nb = read(sockt, buf, sizeof buf); 91 if (nb <= 0) { 92 message("Connection closed. Exiting"); 93 quit(); 94 } 95 display(&his_win, buf, nb); 96 } 97 if (FD_ISSET(fileno(stdin), &read_set)) { 98 /* 99 * We can't make the tty non_blocking, because 100 * curses's output routines would screw up 101 */ 102 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 103 nb = read(0, buf, nb); 104 display(&my_win, buf, nb); 105 /* might lose data here because sockt is non-blocking */ 106 write(sockt, buf, nb); 107 } 108 } 109 } 110 111 extern int errno; 112 extern int sys_nerr; 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