JD,
I ran into the same problem/issue that you are observing. I was not able
to effectively use a casted version of the (void*) parameter.
ap_get_module_config(...) works fine for me.
To clarify some of the questions you have:
- Server config inits are run when the httpd.conf is read (at server
startup) and when .htaccess files are read (at the beginning of each
request).
- Anything created at server startup is created by the parent httpd process;
then at the end of startup, all parent config data is cloned for each child
process (explaining why you see different pointers for what you thought was
the same pointer)
This link may help you understand the Apache startup better:
http://www.f-m-c.org/projects/apache/html/3_3Extending_Apache.html
Sorry if I'm telling you something you already know, but this info would
have helped me immensely when I started module programming.
Dave
On 2/23/07, John David Duncan <[EMAIL PROTECTED]> wrote:
Hi,
I am seeing a very strange issue with per-server config processing.
Consider a config directive:
{ "ServerThing",
(CMD_HAND_TYPE) config_server_thing,
NULL,
RSRC_CONF, TAKE1,
"For Testing"
}
I have a struct to hold the per-server configuration (struct srv).
An instance of struct srv gets allocated and initialized by an init
function, and then when Apache sees "ServerThing foo" in httpd.conf,
it calls config_server_thing:
const char *config_server_thing(cmd_parms *cmd, void *m, char *arg) {
}
So far, so good. But here's the problem: In this function, I should
be able to cast the pointer, m, back to the struct srv that was
initialized earlier.
srv_conf = (struct srv *) m;
But after lots of debugging, I find that:
1) The pointer m is not equal to the pointer that was returned
from the initialization function.
2) m does not hold a copy of the data structure that was initialized.
3) And m is also not equal to the value of
ap_get_module_config(cmd->server->module_config, &my_module)
Finally, as a work-around, I decided to use:
srv_conf = (struct srv *) ap_get_module_config(cmd->server-
>module_config, &my_module);
instead of:
srv_conf = (struct srv *) m;
So, what's the problem? Well...
* It's not a "merge" problem. (I implemented a merging function
just in case, but that never gets called).
* It's not the vhost issue described on pg. 574 of "Writing Apache
Modules with Perl and C" where your init function might never get
called (the init function *is* called, and there are no virtual hosts
at all in this config file)
* It's not a bug with one particular release of Apache -- I see the
same behavior in both 1.3.33 and 2.2.3.
* I can't find any obvious problem with my code (all of my per-
directory config stuff works perfectly).
So, I wonder: is my work-around safe?
Should I file a bug?
Is there someone in particular I should ask for help?
Thanks,
JD
