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

[shuai xi <aha...@gm...>]

hello developer, i want to write a tool for valgrind to analysis an
program automatically.
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?
thanks.