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io.c revision 1.9 
      1 /*	$NetBSD: io.c,v 1.9 2002/12/06 03:21:43 thorpej 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 1.9 2002/12/06 03:21:43 thorpej 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 #include <poll.h>
     58 
     59 #define A_LONG_TIME 1000000
     60 
     61 /*
     62  * The routine to do the actual talking
     63  */
     64 void
     65 talk()
     66 {
     67 	struct pollfd set[2];
     68 	int nb;
     69 	char buf[BUFSIZ];
     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 	set[0].fd = sockt;
     79 	set[0].events = POLLIN;
     80 	set[1].fd = fileno(stdin);
     81 	set[1].events = POLLIN;
     82 	for (;;) {
     83 		nb = poll(set, 2, A_LONG_TIME * 1000);
     84 		if (nb <= 0) {
     85 			if (errno == EINTR)
     86 				continue;
     87 			/* panic, we don't know what happened */
     88 			p_error("Unexpected error from select");
     89 			quit();
     90 		}
     91 		if (set[0].revents & POLLIN) {
     92 			/* There is data on sockt */
     93 			nb = read(sockt, buf, sizeof buf);
     94 			if (nb <= 0) {
     95 				message("Connection closed. Exiting");
     96 				quit();
     97 			}
     98 			display(&his_win, buf, nb);
     99 		}
    100 		if (set[1].revents & POLLIN) {
    101 			/*
    102 			 * We can't make the tty non_blocking, because
    103 			 * curses's output routines would screw up
    104 			 */
    105 			ioctl(0, FIONREAD, (void *) &nb);
    106 			nb = read(0, buf, nb);
    107 			display(&my_win, buf, nb);
    108 			/* might lose data here because sockt is non-blocking */
    109 			write(sockt, buf, nb);
    110 		}
    111 	}
    112 }
    113 
    114 /*
    115  * p_error prints the system error message on the standard location
    116  * on the screen and then exits. (i.e. a curses version of perror)
    117  */
    118 void
    119 p_error(string)
    120 	char *string;
    121 {
    122 	wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
    123 	wprintw(my_win.x_win, "[%s : %s (%d)]\n",
    124 	    string, strerror(errno), errno);
    125 	wrefresh(my_win.x_win);
    126 	move(LINES-1, 0);
    127 	refresh();
    128 	quit();
    129 }
    130 
    131 /*
    132  * Display string in the standard location
    133  */
    134 void
    135 message(string)
    136 	char *string;
    137 {
    138 	wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
    139 	wprintw(my_win.x_win, "[%s]", string);
    140 	wclrtoeol(my_win.x_win);
    141 	current_line++;
    142 	wmove(my_win.x_win, current_line % my_win.x_nlines, 0);
    143 	wrefresh(my_win.x_win);
    144 }
    145