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Annotation of 42BSD/ucb/talk/io.c, revision 1.1

1.1     ! root        1: /* $Header: /a/guest/moore/talk/RCS/io.c,v 1.3 83/07/06 00:17:15 moore Exp $ */
        !             2: 
        !             3: /* this file contains the I/O handling and the exchange of 
        !             4:    edit characters. This connection itself is established in
        !             5:    ctl.c
        !             6:  */
        !             7: 
        !             8: #include "talk.h"
        !             9: #include <stdio.h>
        !            10: #include <errno.h>
        !            11: #include <sys/time.h>
        !            12: 
        !            13: #define A_LONG_TIME 10000000
        !            14: #define STDIN_MASK (1<<fileno(stdin))  /* the bit mask for standard
        !            15:                                           input */
        !            16: extern int errno;
        !            17: 
        !            18: /*
        !            19:  * The routine to do the actual talking
        !            20:  */
        !            21: 
        !            22: talk()
        !            23: {
        !            24:     register int read_template, sockt_mask;
        !            25:     int read_set, nb;
        !            26:     char buf[BUFSIZ];
        !            27:     struct timeval wait;
        !            28: 
        !            29:     message("Connection established\007\007\007");
        !            30:     current_line = 0;
        !            31: 
        !            32:     sockt_mask = (1<<sockt);
        !            33: 
        !            34:        /*
        !            35:         * wait on both the other process (sockt_mask) and 
        !            36:         * standard input ( STDIN_MASK )
        !            37:         */
        !            38: 
        !            39:     read_template = sockt_mask | STDIN_MASK;
        !            40: 
        !            41:     forever {
        !            42: 
        !            43:        read_set = read_template;
        !            44: 
        !            45:        wait.tv_sec = A_LONG_TIME;
        !            46:        wait.tv_usec = 0;
        !            47: 
        !            48:        nb = select(32, &read_set, 0, 0, &wait);
        !            49: 
        !            50:        if (nb <= 0) {
        !            51: 
        !            52:                /* We may be returning from an interupt handler */
        !            53: 
        !            54:            if (errno == EINTR) {
        !            55:                read_set = read_template;
        !            56:                continue;
        !            57:            } else {
        !            58:                    /* panic, we don't know what happened */
        !            59:                p_error("Unexpected error from select");
        !            60:                quit();
        !            61:            }
        !            62:        }
        !            63: 
        !            64:        if ( read_set & sockt_mask ) { 
        !            65: 
        !            66:                /* There is data on sockt */
        !            67:            nb = read(sockt, buf, sizeof buf);
        !            68: 
        !            69:            if (nb <= 0) {
        !            70:                message("Connection closed. Exiting");
        !            71:                quit();
        !            72:            } else {
        !            73:                display(&his_win, buf, nb);
        !            74:            }
        !            75:        }
        !            76:        
        !            77:        if ( read_set & STDIN_MASK ) {
        !            78: 
        !            79:                /* we can't make the tty non_blocking, because
        !            80:                   curses's output routines would screw up */
        !            81: 
        !            82:            ioctl(0, FIONREAD, (struct sgttyb *) &nb);
        !            83:            nb = read(0, buf, nb);
        !            84: 
        !            85:            display(&my_win, buf, nb);
        !            86:            write(sockt, buf, nb);      /* We might lose data here
        !            87:                                           because sockt is non-blocking
        !            88:                                         */
        !            89: 
        !            90:        }
        !            91:     }
        !            92: }
        !            93: 
        !            94: extern int     errno;
        !            95: extern int     sys_nerr;
        !            96: extern char    *sys_errlist[];
        !            97: 
        !            98:     /* p_error prints the system error message on the standard location
        !            99:        on the screen and then exits. (i.e. a curses version of perror)
        !           100:      */
        !           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:     }
        !           111: 
        !           112: 
        !           113:     wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
        !           114:     wprintw(my_win.x_win, "[%s : %s (%d)]\n", string, sys, errno);
        !           115:     wrefresh(my_win.x_win);
        !           116:     move(LINES-1, 0);
        !           117:     refresh();
        !           118:     quit();
        !           119: }
        !           120: 
        !           121:     /* display string in the standard location */
        !           122: 
        !           123: message(string)
        !           124: char *string;
        !           125: {
        !           126:     wmove(my_win.x_win, current_line%my_win.x_nlines, 0);
        !           127:     wprintw(my_win.x_win, "[%s]\n", string);
        !           128:     wrefresh(my_win.x_win);
        !           129: }

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