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From Allasso Travesser <>
Subject Re: [users@httpd] Seg fault when assigning value in AP_INIT_TAKE1 callback
Date Sun, 08 Dec 2013 13:38:05 GMT
Thank you for your input, Nick.  I see what you mean about using a full example; not yet understanding
how modules work, it didn’t occur to me that cfg would be getting initialized somewhere
else.  My c programming skills are also rudimentary.

Regarding mod_auth_form, I am using Apache 2.2.  I tried just loading a 2.4 module, but I
get errors.  If I knew more about Apache and how modules work, I could probably understand
why I am getting the errors.  Hence, the road I am on, as I find it helpful to learn this
stuff anyway.  (I am on Ubuntu 10.04, and there is no official package for Apache 2.4 yet
available, and being a nominal linux user I would rather stick with the mainstream)

Thanks for the help :-)


On Dec 8, 2013, at 12:38 AM, Nick Kew <> wrote:

> On 8 Dec 2013, at 04:17, Allasso Travesser wrote:
>> Hello,
>> Learning to create modules, I want to read configuration directives. I used the following
example out of “The Apache Modules Book” (Nick Kew).  It compiles fine, however, when
I restart apache, I get segmentation fault:
> So why not start with a complete example, then reduce it step-by-step
> to what you have?  That way you see where it falls apart and figure out
> why what you just lost mattered.
> In this case ...
>> The fault seems to be a result of this line of code (no error results if it is removed):
>>  ((txt_cfg*)cfg)->header = val ;
> … cfg needs to have been initialised, but ...
>> module AP_MODULE_DECLARE_DATA customauthform_module =
>> {
>>    NULL,
>>    NULL,
>>    NULL,
>>    NULL,
>>    mod_cmds,
>>    register_hooks,
>> };
> … your initialisation function is NULL.
> (judging by the name of your module, maybe the now-standard
> mod_auth_form would be a good startingpoint for you?)
> -- 
> Nick Kew
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