From: htoaster@yabbs
To: xenon@yabbs
Subject: re: Loop until keypress
Date: Tue Nov  9 16:05:12 1993

In message re: Loop until keypress, xenon said:
> well, ive hacked on select() fer a bit, looked at the man page and wrote 
> sum test programs, but havent figured it out yet...since its non-ANSI, i 
> havent had much luck in the couple of ANSI-C texts i have.  anywayz, do 
> you know of any books i could look at that might give a better description 
> than the man pages (i hate tryin to decypher those damn things).

want some demo code?  Here is the rthe yabbs client:
    while (!readkey) {
        FD_ZERO(&fds);                       /* zero bitfields for select    */
        FD_SET(STDIN, &fds);                 /* check standard input         */
        FD_SET(s, &fds);                     /* check server socket          */

        if (select(s+1, &fds, (fd_set *)NULL, (fd_set *)NULL, NULL) == -1) {
            perror("readc:select");
        }

        /* if our message is from stdin handle it, otherwise it is from
         * the server, so let handlemsg() take care of it
         */
        if (FD_ISSET(s, &fds)) {
             handlemsg();                    /* read and deal with packet    */
        } else if (FD_ISSET(STDIN, &fds)) {
            line = 1;
            ch = fgetc(stdin);
            if ((ch == 4) && (och <= 127))
                killconnection(K_USER);
            else if ((ch != 8) && (ch != 10) && (ch != 13) && (ch != '\t') &&
                (ch != 21) && (ch < 32) && (ch > 127))
                readkey = FALSE;
            else if ((ch == '\n') && (och == '\r'))
                readkey = FALSE;
            else {
                och = ch;
                readkey = TRUE;
                return ch;
            }
        }
    }


this doesn't use the timeout stuff (last parameter to select), but I could
explain that as well.  Also, for those hackers of you out there, this is
the code that causes problems with reading passwords (double return), I think,
so if you see anything stupid in here yell at me.  I haven't looked at the
code in ages, since it hasn't changed much since the first day that I started
yabbs.

alex