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Path: utzoo!mnetor!seismo!rutgers!topaz.rutgers.edu!ron
From: ron@topaz.rutgers.edu (Ron Natalie)
Newsgroups: comp.bugs.4bsd
Subject: Re: read() from tty has fencepost error
Message-ID: <13048@topaz.rutgers.edu>
Date: Tue, 30-Jun-87 15:45:14 EDT
Article-I.D.: topaz.13048
Posted: Tue Jun 30 15:45:14 1987
Date-Received: Wed, 1-Jul-87 05:49:09 EDT
References: <648@haddock.UUCP> <6040@brl-smoke.ARPA>
Organization: Rutgers Univ., New Brunswick, N.J.
Lines: 40

Excuse me System V breath, if you look on your own beloved operating system
you will see that EOT works the opposite way that it does on system V, that
is, the following code

    main()  {
	int count;
	char buf[10];

	do {
	    count = read(0, buf, 5);
	    printf("\ncount = %d\n", count);
	} while(count);
    }

Does the following on Berkeley UNIX (SUN 3.2):
    % a.out
    a<NL>

    count = 2
    abcde<EOT>
    count = 5

    count = 0
    %
  note that it doesn't read the keyboard between the last two printfs.

on both a 3B20 running Sys VR2v3 and a 3B2 running Sys VR3

    % a.out
    a<NL>

    count = 2
    abcde<EOT>
    count = 5

...at this point it waits for you to type more input...

I guess System V is wrong for once :-)

-Ron