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From "Subra A Narayanan" <>
Subject module clean up using apr_pool_cleanup_register
Date Wed, 07 May 2008 19:24:47 GMT
Hello folks,

I am new to apache modules and I am trying to get a better understanding of
how cleanup works. I have Nick Kew's book and it has been a tremendous help.
I hope someone can hep clarify some of the questions that I have.

I have written a module which links in to some other libraries that I have.
In my_module_init from below:

ap_hook_child_init(my_module_init, NULL, NULL, APR_HOOK_MIDDLE);

I call the initialization routines for my own libraries. Also in init, I
register a cleanup function like this:

apr_pool_cleanup_register(pool, (const void*)svr_rec, my_child_exit,

In the my_child_exit function, all I do is call my library's finalize
function to clean up resources.

Is this the right way to do the clean up? Instead of the above line of code,
should I be passing NULL as the second argument for the
apr_pool_cleanup_register function like I have seen in some of the examples
on the web:

apr_pool_cleanup_register(pool, NULL, my_child_exit,


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