[PATCH] Preload infrastructure.

[Jeff Law]

On 10/22/13 15:06, Joseph S. Myers wrote:
>
> So: put this code in the debug/ directory like other debugging preloadable
> libraries; split it up by the different things it's usable to debug, so
> each installed shared object does one clearly defined thing and does it
> well; model the build/install system on how other such libraries are
> built/installed; model other things on those libraries as well (such as
> using an environment variable to specify an output file, not a hardcoded
> /tmp path); generally follow established coding practices for such
> libraries.
Most definitely break it up in some way.  For a developer trying to 
track down a problem, they may already have a clue about the scope of 
the problem and thus may not want to pay the penalty for every 
interceptor function.

ie, if they suspect they're doing something wrong in the pthread 
libraries, paying a 10%+ penalty for memcpy overlap checking is silly.

I would also recommend considering not making these interceptors a part 
of glibc.  They are checking for compliance to various standards which 
is independent of the library implementation underneath.


I must admit this is a bit selfish -- whatever is done here beyond 
what's checked by memstomp Red Hat will probably want to package 
independently of glibc (as we already update our intercept checkers 
independently of glibc) and we will want to present a consistent way to 
enable these checks to the user, consistent error reporting, etc.

Jeff