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  * @(#)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  * $DragonFly: src/usr.bin/talk/io.c,v 1.3 2003/10/04 20:36:52 hmp Exp $
  36  */
  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 <errno.h>
  45 #include <netdb.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <sys/filio.h>
  49 #include "talk.h"
  50 #include "talk_ctl.h"
  51
  52 #define A_LONG_TIME 10000000
  53
  54 /*
  55  * The routine to do the actual talking
  56  */
  57 void
  58 talk(void)
  59 {
  60         struct hostent *hp, *hp2;
  61         int nb;
  62         fd_set read_set, read_template;
  63         char buf[BUFSIZ], **addr, *his_machine_name;
  64         struct timeval wait;
  65
  66         his_machine_name = NULL;
  67         hp = gethostbyaddr((const char *)&his_machine_addr.s_addr,
  68             sizeof(his_machine_addr.s_addr), AF_INET);
  69         if (hp != NULL) {
  70                 hp2 = gethostbyname(hp->h_name);
  71                 if (hp2 != NULL && hp2->h_addrtype == AF_INET &&
  72                     hp2->h_length == sizeof(his_machine_addr))
  73                         for (addr = hp2->h_addr_list; *addr != NULL; addr++)
  74                                 if (memcmp(*addr, &his_machine_addr,
  75                                     sizeof(his_machine_addr)) == 0) {
  76                                         his_machine_name = strdup(hp->h_name);
  77                                         break;
  78                                 }
  79         }
  80         if (his_machine_name == NULL)
  81                 his_machine_name = strdup(inet_ntoa(his_machine_addr));
  82         snprintf(buf, sizeof(buf), "Connection established with %s@%s.",
  83             msg.r_name, his_machine_name);
  84         free(his_machine_name);
  85         message(buf);
  86         write(STDOUT_FILENO, "\007\007\007", 3);
  87
  88         current_line = 0;
  89
  90         /*
  91          * Wait on both the other process (sockt_mask) and
  92          * standard input ( STDIN_MASK )
  93          */
  94         FD_ZERO(&read_template);
  95         FD_SET(sockt, &read_template);
  96         FD_SET(fileno(stdin), &read_template);
  97         for (;;) {
  98                 read_set = read_template;
  99                 wait.tv_sec = A_LONG_TIME;
 100                 wait.tv_usec = 0;
 101                 nb = select(32, &read_set, 0, 0, &wait);
 102                 if (nb <= 0) {
 103                         if (errno == EINTR) {
 104                                 read_set = read_template;
 105                                 continue;
 106                         }
 107                         /* panic, we don't know what happened */
 108                         p_error("Unexpected error from select");
 109                         quit();
 110                 }
 111                 if (FD_ISSET(sockt, &read_set)) {
 112                         /* There is data on sockt */
 113                         nb = read(sockt, buf, sizeof buf);
 114                         if (nb <= 0) {
 115                                 message("Connection closed. Exiting");
 116                                 quit();
 117                         }
 118                         display(&his_win, buf, nb);
 119                 }
 120                 if (FD_ISSET(fileno(stdin), &read_set)) {
 121                         /*
 122                          * We can't make the tty non_blocking, because
 123                          * curses's output routines would screw up
 124                          */
 125                         int i;
 126                         ioctl(0, FIONREAD, (struct sgttyb *) &nb);
 127                         nb = read(0, buf, nb);
 128                         display(&my_win, buf, nb);
 129                         /* might lose data here because sockt is non-blocking */
 130                         for (i = 0; i < nb; ++i)
 131                                 if (buf[i] == '\r')
 132                                         buf[i] = '\n';
 133                         write(sockt, buf, nb);
 134                 }
 135         }
 136 }
 137
 138 /*
 139  * p_error prints the system error message on the standard location
 140  * on the screen and then exits. (i.e. a curses version of perror)
 141  */
 142 void
 143 p_error(char *string)
 144 {
 145         wmove(my_win.x_win, current_line, 0);
 146         wprintw(my_win.x_win, "[%s : %s (%d)]\n",
 147             string, strerror(errno), errno);
 148         wrefresh(my_win.x_win);
 149         move(LINES-1, 0);
 150         refresh();
 151         quit();
 152 }
 153
 154 /*
 155  * Display string in the standard location
 156  */
 157 void
 158 message(char *string)
 159 {
 160         wmove(my_win.x_win, current_line, 0);
 161         wprintw(my_win.x_win, "[%s]\n", string);
 162         if (current_line < my_win.x_nlines - 1)
 163                 current_line++;
 164         wrefresh(my_win.x_win);
 165 }