/etc/rc: stdin/stdout/stderr to /dev/console?

[utzoo!decvax!ucbvax!menlo70!sri-unix!wales at UCLA-Security]

From: wales at UCLA-Security (Rich Wales)
We are running 4.1bsd on VAXen.  A perusal of the "init" code shows that,
just before invoking /etc/rc, files 0-2 (stdin, stdout, stderr) are opened
on the file "/" as follows:

		open ("/", 0); dup (0); dup (0);

The reason for this is not immediately obvious to me.

(1) If the purpose is to close off input and output on /etc/rc, why not
    open "/dev/null" instead of "/"?
(2) Processes forked from /etc/rc still appear to respond to the console.
    For example, if I do a rubout during "fsck -p > /dev/console", the
    "fsck" program goes away.
(3) Almost every line in /etc/rc has "> /dev/console" on it.  Why not
    simply set up /dev/console as the stdin/stdout/stderr of /etc/rc?

-- Rich