Date: Mon, 26 Jun 2000 23:32:03 +0200 From: Adrian Chadd <adrian@freebsd.org> To: Alfred Perlstein <bright@wintelcom.net> Cc: arch@freebsd.org Subject: Re: dynamic filetypes. please comment. Message-ID: <20000626233203.Y36017@zoe.bastard.co.uk> In-Reply-To: <20000626142428.A275@fw.wintelcom.net>; from bright@wintelcom.net on Mon, Jun 26, 2000 at 02:24:28PM -0700 References: <20000626142428.A275@fw.wintelcom.net>
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On Mon, Jun 26, 2000, Alfred Perlstein wrote:
> In order to have a kld add a new filetype (DTYPE_VNODE, DTYPE_PIPE,
> etc.) it needs to generate a unique number.
>
> My inclination is to just add a DTYPE_MAX(*) and provide a function
> for the kld initializers to call "short getnewdtype(void)" which
> returns the next available number. This does limit us to about
> 32764 module driver loads before getnewdtype will return -1 (error).
>
> This idea leads us to a generic api for seqeunce number generation
> that we can use when a subsystem needs an increasing unique number,
> the api would look something like:
>
> (void)sequence_register("filetypes", starting_number);
> mynum = sequence_next("filetypes"); /* to be used for f_type */
The debug gods might like:
mynum = sequence_next("filetypes", "DTYPE_FOO", "A foo-type file");
?
Adrian
--
Adrian Chadd Build a man a fire, and he's warm for the
<adrian@FreeBSD.org> rest of the evening. Set a man on fire and
he's warm for the rest of his life.
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