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Re: segfault after disabling a loadable builtin


From: Chet Ramey
Subject: Re: segfault after disabling a loadable builtin
Date: Fri, 10 Jul 2015 16:18:50 -0400
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.10; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 7/7/15 5:49 PM, Piotr Grzybowski wrote:
> hi,
> 
>  maybe I am mistaken, but I think that keeping track of the
> variables/functions bound/unbound by the loadable bultins leads to a
> complete hell of unmanageable code.
>  It should be noted, that the builtins should clean by themselves,
> e.g., in this case mypid.c should contain something like:
> 
> int __attribute__((destructor)) enable_mypid_builtin_destructor(void) {
>  unbind_variable("MYPID");
> }
> 
>  which removes the calls to noexistent code after the builtin code has
> been removed via dlclose, and cleans the segfault.

This is the right approach, but a disable hook  (destructor) needs to be
part of the interface somehow, which has potentially wide-ranging
consequences.  I will have to think about how to do it.

-- 
``The lyf so short, the craft so long to lerne.'' - Chaucer
                 ``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, ITS, CWRU    address@hidden    http://cnswww.cns.cwru.edu/~chet/



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