Re: [Valgrind-users] About how to hook malloc to do sth and execute the original malloc

[Tom H. <to...@co...>]

On 12/07/18 10:26, shuai xi wrote:

> I know that 'Memcheck's implementation of malloc has "nothing to do" 
> with glibc's implementation' after readind some code of valgrind, but i 
> want to use the glibc's malloc to avoid changing heap layout.
> Memcheck sets the VG_(needs_malloc_replacement) to hook malloc and exec 
> MC_(malloc) instead of real malloc. It's very convenient. So can i 
> get the address of the original malloc in MC_(malloc) and exec it?
> if not,can i use I_WRAP_SONAME_FNNAME_ZU function to hook malloc in my 
> valgrind tool's code?

Yes if you want to wrap the function rather than replacing it
then use the _WRAP_ macros and then your wrapper can get the
original address and call it.

Tom

-- 
Tom Hughes (to...@co...)
http://compton.nu/