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From: karl@haddock.UUCP (Karl Heuer)
Newsgroups: comp.bugs.4bsd
Subject: read() from tty has fencepost error
Message-ID: <648@haddock.UUCP>
Date: Mon, 29-Jun-87 15:12:56 EDT
Article-I.D.: haddock.648
Posted: Mon Jun 29 15:12:56 1987
Date-Received: Wed, 1-Jul-87 00:39:56 EDT
Reply-To: karl@haddock.isc.com (Karl Heuer)
Distribution: world
Organization: Interactive Systems, Boston
Lines: 9

main() {
    char buf[5];
    for (;;) printf("%d\n", read(0, buf, 5));
}

If you type *exactly* 5 characters and terminate the read with EOT (which is
not an EOF in this context, in the middle of a line), the first read returns 5
(as it should) and the second returns 0 (instead of waiting for more input).
Tested on 4.3ansan