Unix Programming - Re: overriding functions with functions that call the original

Author

Re: overriding functions with functions that call the original

Paul Pluzhnikov

2006-03-21, 5:56 pm

phil-news-nospam@ipal.net writes:

> But how does one make use of RTLD_NEXT to do the interposing on the
> platforms that don't have LD_PRELOAD?

RTLD_NEXT helps you find the next definition to call.

If you don't have LD_PRELOAD (or equivalent), you can't do
interpositioning by defintion [1], and RTLD_NEXT doesn't help you any.

Cheers,

[1]
You can't do interpositioning on unmodified exe.
You could still interposition by relinking the exe (and RTLD_NEXT
will help you find the next function to call), or by calling your
interposer libc.so and making the exe find your interposer instead
of the system libc.so
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