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      1 /*
      2  * CDDL HEADER START
      3  *
      4  * The contents of this file are subject to the terms of the
      5  * Common Development and Distribution License, Version 1.0 only
      6  * (the "License").  You may not use this file except in compliance
      7  * with the License.
      8  *
      9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
     10  * or http://www.opensolaris.org/os/licensing.
     11  * See the License for the specific language governing permissions
     12  * and limitations under the License.
     13  *
     14  * When distributing Covered Code, include this CDDL HEADER in each
     15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
     16  * If applicable, add the following below this CDDL HEADER, with the
     17  * fields enclosed by brackets "[]" replaced with your own identifying
     18  * information: Portions Copyright [yyyy] [name of copyright owner]
     19  *
     20  * CDDL HEADER END
     21  */
     22 /*
     23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
     24  * Use is subject to license terms.
     25  */
     26 
     27 /*	Copyright (c) 1983, 1984, 1985, 1986, 1987, 1988, 1989 AT&T	*/
     28 /*	  All Rights Reserved  	*/
     29 
     30 /*
     31  * University Copyright- Copyright (c) 1982, 1986, 1988
     32  * The Regents of the University of California
     33  * All Rights Reserved
     34  *
     35  * University Acknowledgment- Portions of this document are derived from
     36  * software developed by the University of California, Berkeley, and its
     37  * contributors.
     38  */
     39 
     40 #pragma ident	"%Z%%M%	%I%	%E% SMI"
     41 
     42 /*
     43  * this file contains the I/O handling and the exchange of
     44  * edit characters. This connection itself is established in ctl.c
     45  */
     46 
     47 #include "talk.h"
     48 #include <stdio.h>
     49 #include <errno.h>
     50 #include <sys/time.h>
     51 #include <sys/filio.h>
     52 #include <libintl.h>
     53 
     54 #define	A_LONG_TIME 10000000
     55 #define	STDIN_MASK (1<<fileno(stdin))	/* the bit mask for standard input */
     56 
     57 /*
     58  * The routine to do the actual talking
     59  */
     60 
     61 void
     62 talk()
     63 {
     64 	int read_template, sockt_mask;
     65 	int read_set, nb;
     66 	char buf[BUFSIZ];
     67 	struct timeval wait;
     68 
     69 	message(gettext("Connection established"));
     70 	beep(); beep(); beep();
     71 	current_line = 0;
     72 
     73 	sockt_mask = (1<<sockt);
     74 
     75 	/*
     76 	 * wait on both the other process (sockt_mask) and
     77 	 * standard input ( STDIN_MASK )
     78 	 */
     79 
     80 	read_template = sockt_mask | STDIN_MASK;
     81 
     82 	forever {
     83 
     84 		read_set = read_template;
     85 
     86 		wait.tv_sec = A_LONG_TIME;
     87 		wait.tv_usec = 0;
     88 
     89 		nb = select(32, (fd_set *)&read_set, 0, 0, &wait);
     90 
     91 		if (nb <= 0) {
     92 
     93 			/* We may be returning from an interrupt handler */
     94 
     95 			if (errno == EINTR) {
     96 				read_set = read_template;
     97 				continue;
     98 			} else {
     99 				/* panic, we don't know what happened */
    100 				p_error(
    101 				gettext("Unexpected error from select"));
    102 				quit();
    103 			}
    104 		}
    105 
    106 		if (read_set & sockt_mask) {
    107 
    108 			/* There is data on sockt */
    109 			nb = read(sockt, buf, sizeof (buf));
    110 
    111 			if (nb <= 0) {
    112 				message(gettext("Connection closed. Exiting"));
    113 				pause();	/* wait for Ctrl-C */
    114 				quit();
    115 			} else {
    116 				display(&rem_win, buf, nb);
    117 			}
    118 		}
    119 
    120 		if (read_set & STDIN_MASK) {
    121 
    122 			/*
    123 			 * we can't make the tty non_blocking, because
    124 			 * curses's output routines would screw up
    125 			 */
    126 
    127 			ioctl(0, FIONREAD, (struct sgttyb *)&nb);
    128 			nb = read(0, buf, nb);
    129 			display(&my_win, buf, nb);
    130 			write(sockt, buf, nb);
    131 
    132 			/*
    133 			 * We might lose data here because sockt is
    134 			 * non-blocking
    135 			 */
    136 		}
    137 	}
    138 }
    139 
    140 
    141 /*
    142  * p_error prints the system error message on the standard location
    143  * on the screen and then exits. (i.e. a curses version of perror)
    144  */
    145 
    146 void
    147 p_error(char *string)
    148 {
    149 	wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
    150 	wprintw(my_win.x_win, "[%s : %s]\n", string, strerror(errno));
    151 	wrefresh(my_win.x_win);
    152 	move(LINES-1, 0);
    153 	refresh();
    154 	quit();
    155 }
    156 
    157 /* display string in the standard location */
    158 
    159 void
    160 message(char *string)
    161 {
    162 	wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
    163 	wprintw(my_win.x_win, "[%s]\n", string);
    164 	wrefresh(my_win.x_win);
    165 }
    166