Re: Preloading libraries to override BSD IPC function symbols and recursion

[Joerg Sonnenberger <joerg%bec.de@localhost>]

On Fri, Mar 23, 2018 at 04:06:37PM -0400, Matthew Mondor wrote:
> On Fri, 23 Mar 2018 20:32:51 +0100
> Joerg Sonnenberger <joerg%bec.de@localhost> wrote:
> 
> > On Fri, Mar 23, 2018 at 12:12:24PM -0400, Matthew Mondor wrote:
> > > But is there a better solution to always get this right?  
> > 
> > I'm not aware of any compiler intrinsic to get the linker name of a
> > given variable or function. Neither exists for symbol versioning.
> 
> Thanks.  Do you think that it could be feasible (i.e. in a future
> NetBSD release) to always use/present the official symbols and have
> them mapped transparently by the kernel/compat modules depending on
> version information from the ELF header rather than using public
> versioned linker names (or was it previously done this way and changed
> for a reason)?  I assume (possibly wrongly), that these versioned
> symbols are used for binary compatibility?

Frankly, I don't think symbol versioning will give you the expected
behavior either. It just works most of the time since people rarely keep
such binaries around long enough for the next versioning round.

Joerg