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#include <sys/cdefs.h> 35 36#ifndef __APPLE__ 37__FBSDID("$FreeBSD: src/usr.bin/talk/io.c,v 1.16 2004/05/10 15:52:16 cognet Exp $"); 38 39#ifndef lint 40static const char sccsid[] = "@(#)io.c 8.1 (Berkeley) 6/6/93"; 41#endif 42#endif /* __APPLE__ */ 43 44/* 45 * This file contains the I/O handling and the exchange of 46 * edit characters. This connection itself is established in 47 * ctl.c 48 */ 49 50#include <sys/filio.h> 51#ifdef __APPLE__ 52#include <sys/ioctl.h> 53#endif 54 55#include <errno.h> 56#include <signal.h> 57#include <netdb.h> 58#include <stdlib.h> 59#include <string.h> 60#include <unistd.h> 61 62#include "talk.h" 63#include "talk_ctl.h" 64 65#define A_LONG_TIME 10000000 66 67volatile sig_atomic_t gotwinch = 0; 68 69/* 70 * The routine to do the actual talking 71 */ 72void 73talk() 74{ 75 struct hostent *hp, *hp2; 76 int nb; 77 fd_set read_set, read_template; 78 char buf[BUFSIZ], **addr, *his_machine_name; 79 struct timeval wait; 80 81 his_machine_name = NULL; 82 hp = gethostbyaddr((const char *)&his_machine_addr.s_addr, 83 sizeof(his_machine_addr.s_addr), AF_INET); 84 if (hp != NULL) { 85 hp2 = gethostbyname(hp->h_name); 86 if (hp2 != NULL && hp2->h_addrtype == AF_INET && 87 hp2->h_length == sizeof(his_machine_addr)) 88 for (addr = hp2->h_addr_list; *addr != NULL; addr++) 89 if (memcmp(*addr, &his_machine_addr, 90 sizeof(his_machine_addr)) == 0) { 91 his_machine_name = strdup(hp->h_name); 92 break; 93 } 94 } 95 if (his_machine_name == NULL) 96 his_machine_name = strdup(inet_ntoa(his_machine_addr)); 97 snprintf(buf, sizeof(buf), "Connection established with %s@%s.", 98 msg.r_name, his_machine_name); 99 free(his_machine_name); 100 message(buf); 101 write(STDOUT_FILENO, "\007\007\007", 3); 102 103 current_line = 0; 104 105 /* 106 * Wait on both the other process (sockt_mask) and 107 * standard input ( STDIN_MASK ) 108 */ 109 FD_ZERO(&read_template); 110 FD_SET(sockt, &read_template); 111 FD_SET(fileno(stdin), &read_template); 112 for (;;) { 113 read_set = read_template; 114 wait.tv_sec = A_LONG_TIME; 115 wait.tv_usec = 0; 116 nb = select(sockt + 1, &read_set, 0, 0, &wait); 117 if (gotwinch) { 118 resize_display(); 119 gotwinch = 0; 120 } 121 if (nb <= 0) { 122 if (errno == EINTR) { 123 read_set = read_template; 124 continue; 125 } 126 /* panic, we don't know what happened */ 127 p_error("Unexpected error from select"); 128 quit(); 129 } 130 if (FD_ISSET(sockt, &read_set)) { 131 /* There is data on sockt */ 132 nb = read(sockt, buf, sizeof buf); 133 if (nb <= 0) { 134 message("Connection closed. Exiting"); 135 quit(); 136 } 137 display(&his_win, buf, nb); 138 } 139 if (FD_ISSET(fileno(stdin), &read_set)) { 140 /* 141 * We can't make the tty non_blocking, because 142 * curses's output routines would screw up 143 */ 144 int i; 145 ioctl(0, FIONREAD, (void *) &nb); 146 if (nb > sizeof buf) 147 nb = sizeof buf; 148 nb = read(STDIN_FILENO, buf, nb); 149 display(&my_win, buf, nb); 150 /* might lose data here because sockt is non-blocking */ 151 for (i = 0; i < nb; ++i) 152 if (buf[i] == '\r') 153 buf[i] = '\n'; 154 write(sockt, buf, nb); 155 } 156 } 157} 158 159/* 160 * p_error prints the system error message on the standard location 161 * on the screen and then exits. (i.e. a curses version of perror) 162 */ 163void 164p_error(string) 165 const char *string; 166{ 167 wmove(my_win.x_win, current_line, 0); 168 wprintw(my_win.x_win, "[%s : %s (%d)]\n", 169 string, strerror(errno), errno); 170 wrefresh(my_win.x_win); 171 move(LINES-1, 0); 172 refresh(); 173 quit(); 174} 175 176/* 177 * Display string in the standard location 178 */ 179void 180message(string) 181 const char *string; 182{ 183 wmove(my_win.x_win, current_line, 0); 184 wprintw(my_win.x_win, "[%s]\n", string); 185 if (current_line < my_win.x_nlines - 1) 186 current_line++; 187 wrefresh(my_win.x_win); 188} 189