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#1 (**permalink**) 01-05-2008, 08:24 AM

Hello all,

Some of my applications are dumping core when I am trying to dlopen
certain libraries by specifying the following flags together and
specifying the -brtl option to build the applications:-
Combination 1: RTLD_LAZY | RTLD_GLOBAL
Combination 2: RTLD_NOW | RTLD_GLOBAL

And when I remove the RTLD_GLOBAL flag, keeping the -brtl option, the
application works fine.
Is there a reason for such a behaviour?

Any help will be grateful.

Thanks in advance,
Anunay

#2 (**permalink**) 01-05-2008, 08:24 AM

"Anunay" <anunaygupta@gmail.com> writes:

> Some of my applications are dumping core when I am trying to dlopen

Look for a bug *in the application* (or a common library all of the
"crashing" applications share).

> Combination 1: RTLD_LAZY | RTLD_GLOBAL
> Combination 2: RTLD_NOW | RTLD_GLOBAL

There is nothing wrong with the above combinations.

> And when I remove the RTLD_GLOBAL flag, keeping the -brtl option, the
> application works fine.

Coincidence, most likely.

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

#3 (**permalink**) 01-05-2008, 08:25 AM

Thanks Paul, can u please relate to the combination of -brtl and
RTLD_GLOBAL flag? Should we use this flag with -brtl?

#4 (**permalink**) 01-05-2008, 08:26 AM

"Anunay" <anunaygupta@gmail.com> writes:

> can u please relate to the combination of -brtl and

Please spell words completely when posting to usenet.

> RTLD_GLOBAL flag? Should we use this flag with -brtl?

AFAIK, '-brtl' and RTLD_GLOBAL are orthogonal.

You may also wish to read this:
http://www.ibm.com/developerworks/es...dfs/aix_ll.pdf

Cheers,
--
In order to understand recursion you must first understand recursion.
Remove /-nsp/ for email.

#5 (**permalink**) 01-05-2008, 08:26 AM

Paul Pluzhnikov wrote:
> "Anunay" <anunaygupta@gmail.com> writes:
>
>>can u please relate to the combination of -brtl and
>
> Please spell words completely when posting to usenet.

And grammar counts, too :-)

>>RTLD_GLOBAL flag? Should we use this flag with -brtl?
>
> AFAIK, '-brtl' and RTLD_GLOBAL are orthogonal.
>
> You may also wish to read this:
> http://www.ibm.com/developerworks/es...dfs/aix_ll.pdf

The RTLD_GLOBAL flag specifies whether a loaded module can be used
to resolve _subsequent_ loads. If you have duplicate symbol
definitions and loading locally helps, then your symbols are not
compatible. Aside from being bad design, removing the GLOBAL
flag is fine.

And FWIW, RTLD_LAZY and RLTD_NOW are currently equivalent.

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Correct usage of RTLD_GLOBAL flag?