Return to io.c CVS log

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

Annotation of 43BSDTahoe/old/talk/io.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1983 Regents of the University of California.
        !             3:  * All rights reserved.  The Berkeley software License Agreement
        !             4:  * specifies the terms and conditions for redistribution.
        !             5:  */
        !             6: 
        !             7: #ifndef lint
        !             8: static char sccsid[] = "@(#)io.c       5.1 (Berkeley) 6/6/85";
        !             9: #endif not lint
        !            10: 
        !            11: /*
        !            12:  * This file contains the I/O handling and the exchange of 
        !            13:  * edit characters. This connection itself is established in
        !            14:  * ctl.c
        !            15:  */
        !            16: 
        !            17: #include "talk.h"
        !            18: #include <stdio.h>
        !            19: #include <errno.h>
        !            20: #include <sys/time.h>
        !            21: 
        !            22: #define A_LONG_TIME 10000000
        !            23: #define STDIN_MASK (1<<fileno(stdin))  /* the bit mask for standard
        !            24:                                           input */
        !            25: extern int errno;
        !            26: 
        !            27: /*
        !            28:  * The routine to do the actual talking
        !            29:  */
        !            30: talk()
        !            31: {
        !            32:        register int read_template, sockt_mask;
        !            33:        int read_set, nb;
        !            34:        char buf[BUFSIZ];
        !            35:        struct timeval wait;
        !            36: 
        !            37:        message("Connection established\007\007\007");
        !            38:        current_line = 0;
        !            39:        sockt_mask = (1<<sockt);
        !            40: 
        !            41:        /*
        !            42:         * Wait on both the other process (sockt_mask) and 
        !            43:         * standard input ( STDIN_MASK )
        !            44:         */
        !            45:        read_template = sockt_mask | STDIN_MASK;
        !            46:        forever {
        !            47:                read_set = read_template;
        !            48:                wait.tv_sec = A_LONG_TIME;
        !            49:                wait.tv_usec = 0;
        !            50:                nb = select(32, &read_set, 0, 0, &wait);
        !            51:                if (nb <= 0) {
        !            52:                        if (errno == EINTR) {
        !            53:                                read_set = read_template;
        !            54:                                continue;
        !            55:                        }
        !            56:                        /* panic, we don't know what happened */
        !            57:                        p_error("Unexpected error from select");
        !            58:                        quit();
        !            59:                }
        !            60:                if (read_set & sockt_mask) { 
        !            61:                        /* There is data on sockt */
        !            62:                        nb = read(sockt, buf, sizeof buf);
        !            63:                        if (nb <= 0) {
        !            64:                                message("Connection closed. Exiting");
        !            65:                                quit();
        !            66:                        }
        !            67:                        display(&his_win, buf, nb);
        !            68:                }
        !            69:                if (read_set & STDIN_MASK) {
        !            70:                        /*
        !            71:                         * We can't make the tty non_blocking, because
        !            72:                         * curses's output routines would screw up
        !            73:                         */
        !            74:                        ioctl(0, FIONREAD, (struct sgttyb *) &nb);
        !            75:                        nb = read(0, buf, nb);
        !            76:                        display(&my_win, buf, nb);
        !            77:                        /* might lose data here because sockt is non-blocking */
        !            78:                        write(sockt, buf, nb);
        !            79:                }
        !            80:        }
        !            81: }
        !            82: 
        !            83: extern int errno;
        !            84: extern int sys_nerr;
        !            85: extern char *sys_errlist[];
        !            86: 
        !            87: /*
        !            88:  * p_error prints the system error message on the standard location
        !            89:  * on the screen and then exits. (i.e. a curses version of perror)
        !            90:  */
        !            91: p_error(string) 
        !            92:        char *string;
        !            93: {
        !            94:        char *sys;
        !            95: 
        !            96:        sys = "Unknown error";
        !            97:        if (errno < sys_nerr)
        !            98:                sys = sys_errlist[errno];
        !            99:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
        !           100:        wprintw(my_win.x_win, "[%s : %s (%d)]\n", string, sys, errno);
        !           101:        wrefresh(my_win.x_win);
        !           102:        move(LINES-1, 0);
        !           103:        refresh();
        !           104:        quit();
        !           105: }
        !           106: 
        !           107: /*
        !           108:  * Display string in the standard location
        !           109:  */
        !           110: message(string)
        !           111:        char *string;
        !           112: {
        !           113: 
        !           114:        wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
        !           115:        wprintw(my_win.x_win, "[%s]\n", string);
        !           116:        wrefresh(my_win.x_win);
        !           117: }

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