usr.bin/talk/io.c

   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 __FBSDID("$FreeBSD$");
  37
  38 #ifndef lint
  39 static const char sccsid[] = "@(#)io.c  8.1 (Berkeley) 6/6/93";
  40 #endif
  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 <sys/filio.h>
  49
  50 #include <errno.h>
  51 #include <signal.h>
  52 #include <netdb.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <unistd.h>
  56
  57 #include "talk.h"
  58 #include "talk_ctl.h"
  59
  60 #define A_LONG_TIME 10000000
  61
  62 volatile sig_atomic_t gotwinch = 0;
  63
  64 /*
  65  * The routine to do the actual talking
  66  */
  67 void
  68 talk(void)
  69 {
  70         struct hostent *hp, *hp2;
  71         int nb;
  72         fd_set read_set, read_template;
  73         char buf[BUFSIZ], **addr, *his_machine_name;
  74         struct timeval wait;
  75
  76         his_machine_name = NULL;
  77         hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
  78             sizeof(his_machine_addr.s_addr), AF_INET);
  79         if (hp != NULL) {
  80                 hp2 = gethostbyname(hp->h_name);
  81                 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
  82                     hp2->h_length == sizeof(his_machine_addr))
  83                         for (addr = hp2->h_addr_list; *addr != NULL; addr++)
  84                                 if (memcmp(*addr, &his_machine_addr,
  85                                     sizeof(his_machine_addr)) == 0) {
  86                                         his_machine_name = strdup(hp->h_name);
  87                                         break;
  88                                 }
  89         }
  90         if (his_machine_name == NULL)
  91                 his_machine_name = strdup(inet_ntoa(his_machine_addr));
  92         snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
  93             msg.r_name, his_machine_name);
  94         free(his_machine_name);
  95         message(buf);
  96         write(STDOUT_FILENO, "\007\007\007", 3);
  97
  98         current_line = 0;
  99
 100         /*
 101          * Wait on both the other process (sockt_mask) and
 102          * standard input ( STDIN_MASK )
 103          */
 104         FD_ZERO(&read_template);
 105         FD_SET(sockt, &read_template);
 106         FD_SET(fileno(stdin), &read_template);
 107         for (;;) {
 108                 read_set = read_template;
 109                 wait.tv_sec = A_LONG_TIME;
 110                 wait.tv_usec = 0;
 111                 nb = select(32, &read_set, 0, 0, &wait);
 112                 if (gotwinch) {
 113                         resize_display();
 114                         gotwinch = 0;
 115                 }
 116                 if (nb <= 0) {
 117                         if (errno == EINTR) {
 118                                 read_set = read_template;
 119                                 continue;
 120                         }
 121                         /* panic, we don't know what happened */
 122                         p_error("Unexpected error from select");
 123                         quit();
 124                 }
 125                 if (FD_ISSET(sockt, &read_set)) {
 126                         /* There is data on sockt */
 127                         nb = read(sockt, buf, sizeof buf);
 128                         if (nb <= 0) {
 129                                 message("Connection closed. Exiting");
 130                                 quit();
 131                         }
 132                         display(&his_win, buf, nb);
 133                 }
 134                 if (FD_ISSET(fileno(stdin), &read_set)) {
 135                         /*
 136                          * We can't make the tty non_blocking, because
 137                          * curses's output routines would screw up
 138                          */
 139                         int i;
 140                         ioctl(0, FIONREAD, (void *) &nb);
 141                         if (nb > (ssize_t)(sizeof buf))
 142                                 nb = sizeof buf;
 143                         nb = read(STDIN_FILENO, buf, nb);
 144                         display(&my_win, buf, nb);
 145                         /* might lose data here because sockt is non-blocking */
 146                         for (i = 0; i < nb; ++i)
 147                                 if (buf[i] == '\r')
 148                                         buf[i] = '\n';
 149                         write(sockt, buf, nb);
 150                 }
 151         }
 152 }
 153
 154 /*
 155  * p_error prints the system error message on the standard location
 156  * on the screen and then exits. (i.e. a curses version of perror)
 157  */
 158 void
 159 p_error(const char *string)
 160 {
 161         wmove(my_win.x_win, current_line, 0);
 162         wprintw(my_win.x_win, "[%s : %s (%d)]\n",
 163             string, strerror(errno), errno);
 164         wrefresh(my_win.x_win);
 165         move(LINES-1, 0);
 166         refresh();
 167         quit();
 168 }
 169
 170 /*
 171  * Display string in the standard location
 172  */
 173 void
 174 message(const char *string)
 175 {
 176         wmove(my_win.x_win, current_line, 0);
 177         wprintw(my_win.x_win, "[%s]\n", string);
 178         if (current_line < my_win.x_nlines - 1)
 179                 current_line++;
 180         wrefresh(my_win.x_win);
 181 }