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Annotation of 43BSDTahoe/ucb/talk/io.c, revision 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: }

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