Return to io.c CVS log

Up to [CSRG BSD Unix] / 43BSDTahoe / ucb / talk

Annotation of 43BSDTahoe/ucb/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 the above copyright notice and this paragraph are
                      7:  * duplicated in all such forms and that any documentation,
                      8:  * advertising materials, and other materials related to such
                      9:  * distribution and use acknowledge that the software was developed
                     10:  * by the University of California, Berkeley.  The name of the
                     11:  * University may not be used to endorse or promote products derived
                     12:  * from this software without specific prior written permission.
                     13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     16:  */
                     17: 
                     18: #ifndef lint
                     19: static char sccsid[] = "@(#)io.c       5.3 (Berkeley) 6/29/88";
                     20: #endif /* not lint */
                     21: 
                     22: /*
                     23:  * This file contains the I/O handling and the exchange of 
                     24:  * edit characters. This connection itself is established in
                     25:  * ctl.c
                     26:  */
                     27: 
                     28: #include "talk.h"
                     29: #include <stdio.h>
                     30: #include <errno.h>
                     31: #include <sys/time.h>
                     32: 
                     33: #define A_LONG_TIME 10000000
                     34: #define STDIN_MASK (1<<fileno(stdin))  /* the bit mask for standard
                     35:                                           input */
                     36: extern int errno;
                     37: 
                     38: /*
                     39:  * The routine to do the actual talking
                     40:  */
                     41: talk()
                     42: {
                     43:        register int read_template, sockt_mask;
                     44:        int read_set, nb;
                     45:        char buf[BUFSIZ];
                     46:        struct timeval wait;
                     47: 
                     48:        message("Connection established\007\007\007");
                     49:        current_line = 0;
                     50:        sockt_mask = (1<<sockt);
                     51: 
                     52:        /*
                     53:         * Wait on both the other process (sockt_mask) and 
                     54:         * standard input ( STDIN_MASK )
                     55:         */
                     56:        read_template = sockt_mask | STDIN_MASK;
                     57:        forever {
                     58:                read_set = read_template;
                     59:                wait.tv_sec = A_LONG_TIME;
                     60:                wait.tv_usec = 0;
                     61:                nb = select(32, &read_set, 0, 0, &wait);
                     62:                if (nb <= 0) {
                     63:                        if (errno == EINTR) {
                     64:                                read_set = read_template;
                     65:                                continue;
                     66:                        }
                     67:                        /* panic, we don't know what happened */
                     68:                        p_error("Unexpected error from select");
                     69:                        quit();
                     70:                }
                     71:                if (read_set & sockt_mask) { 
                     72:                        /* There is data on sockt */
                     73:                        nb = read(sockt, buf, sizeof buf);
                     74:                        if (nb <= 0) {
                     75:                                message("Connection closed. Exiting");
                     76:                                quit();
                     77:                        }
                     78:                        display(&his_win, buf, nb);
                     79:                }
                     80:                if (read_set & STDIN_MASK) {
                     81:                        /*
                     82:                         * We can't make the tty non_blocking, because
                     83:                         * curses's output routines would screw up
                     84:                         */
                     85:                        ioctl(0, FIONREAD, (struct sgttyb *) &nb);
                     86:                        nb = read(0, buf, nb);
                     87:                        display(&my_win, buf, nb);
                     88:                        /* might lose data here because sockt is non-blocking */
                     89:                        write(sockt, buf, nb);
                     90:                }
                     91:        }
                     92: }
                     93: 
                     94: extern int errno;
                     95: extern int sys_nerr;
                     96: extern char *sys_errlist[];
                     97: 
                     98: /*
                     99:  * p_error prints the system error message on the standard location
                    100:  * on the screen and then exits. (i.e. a curses version of perror)
                    101:  */
                    102: p_error(string) 
                    103:        char *string;
                    104: {
                    105:        char *sys;
                    106: 
                    107:        sys = "Unknown error";
                    108:        if (errno < sys_nerr)
                    109:                sys = sys_errlist[errno];
                    110:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
                    111:        wprintw(my_win.x_win, "[%s : %s (%d)]\n", string, sys, errno);
                    112:        wrefresh(my_win.x_win);
                    113:        move(LINES-1, 0);
                    114:        refresh();
                    115:        quit();
                    116: }
                    117: 
                    118: /*
                    119:  * Display string in the standard location
                    120:  */
                    121: message(string)
                    122:        char *string;
                    123: {
                    124: 
                    125:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
                    126:        wprintw(my_win.x_win, "[%s]\n", string);
                    127:        wrefresh(my_win.x_win);
                    128: }

This archive runs on limited infrastructure. Preserving old code on modern bandwidth. Automated agents are requested to crawl responsibly.