[petsc-dev] PetscDLSym called on an empty handle

[Lisandro Dalcin]

On 5 August 2010 13:40, Dmitry Karpeev <karpeev at mcs.anl.gov> wrote:
> What is the intended behavior of PetscDLSym when called on an empty handle:
> PetscDLSym(handle=PETSC_NULL, symbol, &value)
> My understanding was that this should look for symbol in the symbol table of
> the main executable.
> This is based on what happens in the Windows case (#ifdef
> PETSC_HAVE_WINDOWS_H),
> but when using dlopen (#ifdef PETSC_HAVE_DLFCN_H), this probably won't
> behave correctly,as currently implemented.
> This is because the above call will boil down to
>    value = dlsym((dlhandle_t)0, symbol),
> which on many systems returns NULL (e.g., on Ubuntu 9.10).

Look at your dlfch.h header file.. Does it have the line below?:

# define RTLD_DEFAULT	((void *) 0)



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Lisandro Dalcin
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