How to tell compiler to use my_malloc inplace of normal 'malloc'

["Mynampati, Venkata S." <MynamVS at nsc-msg01 dot network dot com>]

Hi,
My question is a bit confusing, but it pertains to what i read sometime
back, which is like this:
I read that while compiling i can tell the compiler to replace all mallocs
with my wrapper function called 'my_malloc', in which, i do something
and call malloc. I remember reading that i can use this facility to keep
track of whose using malloc and how many number of times.
i.e where ever 'malloc' is used, 'my_malloc' gets substituted.

Could you helping me how to achieve this using gcc? 
[or may be i dreamt up this one]

Best Regards
Venkat


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