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 * @(#)io.c 8.1 (Berkeley) 6/6/93 34 * $FreeBSD: src/usr.bin/talk/io.c,v 1.9.2.2 2001/10/15 13:42:07 dd Exp $ 35 */ 36 37 /* 38 * This file contains the I/O handling and the exchange of 39 * edit characters. This connection itself is established in 40 * ctl.c 41 */ 42 43 #include <errno.h> 44 #include <netdb.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <sys/filio.h> 48 #include "talk.h" 49 #include "talk_ctl.h" 50 51 #define A_LONG_TIME 10000000 52 53 /* 54 * The routine to do the actual talking 55 */ 56 void 57 talk(void) 58 { 59 struct hostent *hp, *hp2; 60 int nb; 61 fd_set read_set, read_template; 62 char buf[BUFSIZ], **addr, *his_machine_name; 63 struct timeval wait; 64 65 his_machine_name = NULL; 66 hp = gethostbyaddr(&his_machine_addr.s_addr, 67 sizeof(his_machine_addr.s_addr), AF_INET); 68 if (hp != NULL) { 69 hp2 = gethostbyname(hp->h_name); 70 if (hp2 != NULL && hp2->h_addrtype == AF_INET && 71 hp2->h_length == sizeof(his_machine_addr)) 72 for (addr = hp2->h_addr_list; *addr != NULL; addr++) 73 if (memcmp(*addr, &his_machine_addr, 74 sizeof(his_machine_addr)) == 0) { 75 his_machine_name = strdup(hp->h_name); 76 break; 77 } 78 } 79 if (his_machine_name == NULL) 80 his_machine_name = strdup(inet_ntoa(his_machine_addr)); 81 snprintf(buf, sizeof(buf), "Connection established with %s@%s.", 82 msg.r_name, his_machine_name); 83 free(his_machine_name); 84 message(buf); 85 write(STDOUT_FILENO, "\007\007\007", 3); 86 87 current_line = 0; 88 89 /* 90 * Wait on both the other process (sockt_mask) and 91 * standard input ( STDIN_MASK ) 92 */ 93 FD_ZERO(&read_template); 94 FD_SET(sockt, &read_template); 95 FD_SET(fileno(stdin), &read_template); 96 for (;;) { 97 read_set = read_template; 98 wait.tv_sec = A_LONG_TIME; 99 wait.tv_usec = 0; 100 nb = select(32, &read_set, 0, 0, &wait); 101 if (nb <= 0) { 102 if (errno == EINTR) { 103 read_set = read_template; 104 continue; 105 } 106 /* panic, we don't know what happened */ 107 p_error("Unexpected error from select"); 108 quit(); 109 } 110 if (FD_ISSET(sockt, &read_set)) { 111 /* There is data on sockt */ 112 nb = read(sockt, buf, sizeof buf); 113 if (nb <= 0) { 114 message("Connection closed. Exiting"); 115 quit(); 116 } 117 display(&his_win, buf, nb); 118 } 119 if (FD_ISSET(fileno(stdin), &read_set)) { 120 /* 121 * We can't make the tty non_blocking, because 122 * curses's output routines would screw up 123 */ 124 int i; 125 ioctl(0, FIONREAD, (struct sgttyb *) &nb); 126 nb = read(0, buf, nb); 127 display(&my_win, buf, nb); 128 /* might lose data here because sockt is non-blocking */ 129 for (i = 0; i < nb; ++i) 130 if (buf[i] == '\r') 131 buf[i] = '\n'; 132 write(sockt, buf, nb); 133 } 134 } 135 } 136 137 /* 138 * p_error prints the system error message on the standard location 139 * on the screen and then exits. (i.e. a curses version of perror) 140 */ 141 void 142 p_error(const char *string) 143 { 144 wmove(my_win.x_win, current_line, 0); 145 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 146 string, strerror(errno), errno); 147 wrefresh(my_win.x_win); 148 move(LINES-1, 0); 149 refresh(); 150 quit(); 151 } 152 153 /* 154 * Display string in the standard location 155 */ 156 void 157 message(const char *string) 158 { 159 wmove(my_win.x_win, current_line, 0); 160 wprintw(my_win.x_win, "[%s]\n", string); 161 if (current_line < my_win.x_nlines - 1) 162 current_line++; 163 wrefresh(my_win.x_win); 164 } 165