wrap functions in glibc

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wrap functions in glibc
\ Ютъи (21 Nov 2007)
. \ John (Eljay) Love-Jensen (21 Nov 2007)

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Subject:	wrap functions in glibc
Group:	Gcc-help
From:	Ютъи
Date:	21 Nov 2007

Hi
As indicated in gcc maunal and ld manual,
Using "-Wl,--wrap -Wl,wraper_func_name" can provide a wrapper function
for certain interface in the program. However, I found this doesn't
work for function calls in the shared library.

for example, if I use
-Wl,--wrap -Wl,malloc
to wrap the malloc function, I can wrap the calls to malloc in my
code, but the malloc called in library cannot be wrapped. I think this
is because --wrap option is managed by linker, while it cannot replace
calls to malloc in library with wrapper functions.

However, if I want to wrap function calls in library (e.g. memcpy),
what should I do?

Any hints on this problem is truly appreciated.

Andrew