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Annotation of 43BSDReno/usr.bin/talk/io.c, revision 1.1.1.1

1.1       root        1: /*
                      2:  * Copyright (c) 1983 Regents of the University of California.
                      3:  * All rights reserved.
                      4:  *
                      5:  * Redistribution and use in source and binary forms are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: static char sccsid[] = "@(#)io.c       5.5 (Berkeley) 6/1/90";
                     22: #endif /* not lint */
                     23: 
                     24: /*
                     25:  * This file contains the I/O handling and the exchange of 
                     26:  * edit characters. This connection itself is established in
                     27:  * ctl.c
                     28:  */
                     29: 
                     30: #include <sys/time.h>
                     31: #include "talk.h"
                     32: #include <stdio.h>
                     33: #include <errno.h>
                     34: #include <string.h>
                     35: 
                     36: #define A_LONG_TIME 10000000
                     37: #define STDIN_MASK (1<<fileno(stdin))  /* the bit mask for standard
                     38:                                           input */
                     39: 
                     40: /*
                     41:  * The routine to do the actual talking
                     42:  */
                     43: talk()
                     44: {
                     45:        register int read_template, sockt_mask;
                     46:        int read_set, nb;
                     47:        char buf[BUFSIZ];
                     48:        struct timeval wait;
                     49: 
                     50:        message("Connection established\007\007\007");
                     51:        current_line = 0;
                     52:        sockt_mask = (1<<sockt);
                     53: 
                     54:        /*
                     55:         * Wait on both the other process (sockt_mask) and 
                     56:         * standard input ( STDIN_MASK )
                     57:         */
                     58:        read_template = sockt_mask | STDIN_MASK;
                     59:        forever {
                     60:                read_set = read_template;
                     61:                wait.tv_sec = A_LONG_TIME;
                     62:                wait.tv_usec = 0;
                     63:                nb = select(32, &read_set, 0, 0, &wait);
                     64:                if (nb <= 0) {
                     65:                        if (errno == EINTR) {
                     66:                                read_set = read_template;
                     67:                                continue;
                     68:                        }
                     69:                        /* panic, we don't know what happened */
                     70:                        p_error("Unexpected error from select");
                     71:                        quit();
                     72:                }
                     73:                if (read_set & sockt_mask) { 
                     74:                        /* There is data on sockt */
                     75:                        nb = read(sockt, buf, sizeof buf);
                     76:                        if (nb <= 0) {
                     77:                                message("Connection closed. Exiting");
                     78:                                quit();
                     79:                        }
                     80:                        display(&his_win, buf, nb);
                     81:                }
                     82:                if (read_set & STDIN_MASK) {
                     83:                        /*
                     84:                         * We can't make the tty non_blocking, because
                     85:                         * curses's output routines would screw up
                     86:                         */
                     87:                        ioctl(0, FIONREAD, (struct sgttyb *) &nb);
                     88:                        nb = read(0, buf, nb);
                     89:                        display(&my_win, buf, nb);
                     90:                        /* might lose data here because sockt is non-blocking */
                     91:                        write(sockt, buf, nb);
                     92:                }
                     93:        }
                     94: }
                     95: 
                     96: extern int errno;
                     97: extern int sys_nerr;
                     98: 
                     99: /*
                    100:  * p_error prints the system error message on the standard location
                    101:  * on the screen and then exits. (i.e. a curses version of perror)
                    102:  */
                    103: p_error(string) 
                    104:        char *string;
                    105: {
                    106:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
                    107:        wprintw(my_win.x_win, "[%s : %s (%d)]\n",
                    108:            string, strerror(errno), errno);
                    109:        wrefresh(my_win.x_win);
                    110:        move(LINES-1, 0);
                    111:        refresh();
                    112:        quit();
                    113: }
                    114: 
                    115: /*
                    116:  * Display string in the standard location
                    117:  */
                    118: message(string)
                    119:        char *string;
                    120: {
                    121: 
                    122:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
                    123:        wprintw(my_win.x_win, "[%s]\n", string);
                    124:        wrefresh(my_win.x_win);
                    125: }

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