Re: What is n in a hook function?

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On Mon, Apr 27, 2020 at 12:09 PM Jeffrey Walton <noloader@xxxxxxxxx> wrote:
>
> On Mon, Apr 27, 2020 at 12:01 PM Eric Covener <covener@xxxxxxxxx> wrote:
> >
> > On Mon, Apr 27, 2020 at 11:52 AM Jeffrey Walton <noloader@xxxxxxxxx> wrote:
> > >
> > > I'm reading https://httpd.apache.org/docs/2.4/developer/hooks.html. It
> > > says to declare a hook function:
> > >
> > >     AP_DECLARE_HOOK(int, do_something, (request_rec *r, int n))
> > >
> > > But it does not explain the parameters. I know what request_rec is,
> > > but I don't know what n is.
> > >
> > > What is n in the hook function?
> >
> > It is just an example 2nd argument that each hook participant will
> > receive. In the doc it's a made-up hook with a made-up additional arg.
> > Many basic request-processing hooks just take a request_rec for example.
>
> Thanks Eric.
>
> ap_hook_quick_handler uses a function with that particular signature.
> Would you happen to know what the int is used for in that case?
>
> (ap_hook_quick_handler is the reason for the question. Also see
> https://httpd.apache.org/docs/2.4/developer/modguide.html).

You can find the doc for the built-in hooks in include/

/**
 * Run the quick handler functions for each module. The quick_handler
 * is run before any other requests hooks are called (location_walk,
 * directory_walk, access checking, et. al.). This hook was added
 * to provide a quick way to serve content from a URI keyed cache.
 *
 * @param r The request_rec
 * @param lookup_uri Controls whether the caller actually wants content or not.
 * lookup is set when the quick_handler is called out of
 * ap_sub_req_lookup_uri()
 */
AP_DECLARE_HOOK(int,quick_handler,(request_rec *r, int lookup_uri))




-- 
Eric Covener
covener@xxxxxxxxx

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