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io.c revision 1.5 
      1 /*	$NetBSD: io.c,v 1.5 1997/10/20 00:23:24 lukem Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1983, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. All advertising materials mentioning features or use of this software
     16  *    must display the following acknowledgement:
     17  *	This product includes software developed by the University of
     18  *	California, Berkeley and its contributors.
     19  * 4. Neither the name of the University nor the names of its contributors
     20  *    may be used to endorse or promote products derived from this software
     21  *    without specific prior written permission.
     22  *
     23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     33  * SUCH DAMAGE.
     34  */
     35 
     36 #include <sys/cdefs.h>
     37 #ifndef lint
     38 #if 0
     39 static char sccsid[] = "@(#)io.c	8.1 (Berkeley) 6/6/93";
     40 #endif
     41 __RCSID("$NetBSD: io.c,v 1.5 1997/10/20 00:23:24 lukem Exp $");
     42 #endif /* not lint */
     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 "talk.h"
     51 #include <sys/ioctl.h>
     52 #include <sys/time.h>
     53 #include <stdio.h>
     54 #include <errno.h>
     55 #include <string.h>
     56 #include <unistd.h>
     57 
     58 #define A_LONG_TIME 10000000
     59 
     60 /*
     61  * The routine to do the actual talking
     62  */
     63 void
     64 talk()
     65 {
     66 	fd_set read_template, read_set;
     67 	int nb;
     68 	char buf[BUFSIZ];
     69 	struct timeval wait;
     70 
     71 	message("Connection established\007\007\007");
     72 	current_line = 0;
     73 
     74 	/*
     75 	 * Wait on both the other process (sockt_mask) and
     76 	 * standard input ( STDIN_MASK )
     77 	 */
     78 	FD_ZERO(&read_template);
     79 	FD_SET(sockt, &read_template);
     80 	FD_SET(fileno(stdin), &read_template);
     81 	for (;;) {
     82 		read_set = read_template;
     83 		wait.tv_sec = A_LONG_TIME;
     84 		wait.tv_usec = 0;
     85 		nb = select(32, &read_set, 0, 0, &wait);
     86 		if (nb <= 0) {
     87 			if (errno == EINTR) {
     88 				read_set = read_template;
     89 				continue;
     90 			}
     91 			/* panic, we don't know what happened */
     92 			p_error("Unexpected error from select");
     93 			quit();
     94 		}
     95 		if (FD_ISSET(sockt, &read_set)) {
     96 			/* There is data on sockt */
     97 			nb = read(sockt, buf, sizeof buf);
     98 			if (nb <= 0) {
     99 				message("Connection closed. Exiting");
    100 				quit();
    101 			}
    102 			display(&his_win, buf, nb);
    103 		}
    104 		if (FD_ISSET(fileno(stdin), &read_set)) {
    105 			/*
    106 			 * We can't make the tty non_blocking, because
    107 			 * curses's output routines would screw up
    108 			 */
    109 			ioctl(0, FIONREAD, (struct sgttyb *) &nb);
    110 			nb = read(0, buf, nb);
    111 			display(&my_win, buf, nb);
    112 			/* might lose data here because sockt is non-blocking */
    113 			write(sockt, buf, nb);
    114 		}
    115 	}
    116 }
    117 
    118 /*
    119  * p_error prints the system error message on the standard location
    120  * on the screen and then exits. (i.e. a curses version of perror)
    121  */
    122 void
    123 p_error(string)
    124 	char *string;
    125 {
    126 	wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
    127 	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
    128 	    string, strerror(errno), errno);
    129 	wrefresh(my_win.x_win);
    130 	move(LINES-1, 0);
    131 	refresh();
    132 	quit();
    133 }
    134 
    135 /*
    136  * Display string in the standard location
    137  */
    138 void
    139 message(string)
    140 	char *string;
    141 {
    142 	wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
    143 	wprintw(my_win.x_win, "[%s]", string);
    144 	wclrtoeol(my_win.x_win);
    145 	current_line++;
    146 	wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
    147 	wrefresh(my_win.x_win);
    148 }
    149