Re: reload rc.conf during boot process

From: Giorgos Keramidas (keramida_at_ceid.upatras.gr)
Date: 09/21/04

  • Next message: Markie: "Re: reload rc.conf during boot process" 
    Date: Tue, 21 Sep 2004 16:24:48 +0300
To: Markie <mark.cullen@dsl.pipex.com>

    On 2004-09-21 14:18, Markie <mark.cullen@dsl.pipex.com> wrote:
    > "Giorgos Keramidas" <keramida@ceid.upatras.gr> wrote:
    > | > After running my program in the rc.d mount script I then did a
    > | >
    > | > . /etc/rc.conf
    > | >
    > | > but rc.conf doesn't get reloaded.
    > |
    > | The /etc/rc script is a ``driver script'' that loads rc.conf before teh
    > | mount script has a chance to run. Even if you reload rc.conf in the
    > | mountd script this cannot affect the parent process that runs /etc/rc.
    >
    > Oh I think I see what you're saying, it's kind of like variable scope,
    > right? When I do . /etc/rc.conf in mountcritlocal that's loading the file,
    > but only for that script? It's not actually replacing the variables at all,
    > right?

    They're environment variables and that's how environment variables work in
    UNIX. Environment variables can be changed in a process and this will affect
    all the processes spawned off by the one with the changed environment but it
    won't affect processes higher up the hierarchy.

    The `/etc/rc' script starts `/etc/rc.d/mountd' after setting some of these
    variables (by running . /etc/rc.conf as usual). The mountd process inherits
    the environment of /etc/rc and can make changes to its environment as much as
    it wants. The changes don't affect the parent process (the /etc/rc
    invocation).

    > I saw load_rc_config 'XXX' in early.sh or something, just a minute ago!
    > Does the XXX do anything?

    Not much. It's just a placeholder to shuttup the checks near the beginning of
    `load_rc_config'. Passing an invalid `command name' to load_rc_config lets us
    load /etc/rc.conf and any other config file listed in "$source_rc_confs"
    without having to re-invent load_rc_config every time.

    > I don't actually have rc.conf.d either, as far as I can tell?

    This shouldn't be a problem. Don't worry about it.

    > My idea was so I could try out FreeBSD on my laptop and keep it usable on
    > the University network, [...]

    Yeah, I figured it was something of this sort :)

    - Giorgos

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