Re: How to overwrite a symbolic link?

[Marc Herbert]

Le 07/05/2010 15:21, Peng Yu a écrit :

> Would you please elaborate a little more on how to use LD_PRELOAD to
> modify the call. If the library (for example, 'open' from stdlib.h)
> is statically compiled in the binary, is LD_PRELOAD going to replace
> it with a different 'open' function?

Header files usually do not hold definitions (only declarations), so
header files usually do not matter to LD_PRELOAD.

LD_PRELOAD plays games with dynamic libraries, it cannot modify static
linkage. But AFAIK 'open' is defined in the libc, so I would be quite
surprised that its definition ends up statically linked into your binary.



PS: you are not supposed to include stdlib.h to get the declaration of 'open'.