How does valgrind work?

Question

Can someone provide a quick top level explanation of how Valgrind works? An example: how does it know when memory is allocated and freed?

Answer 1

Here you can find some nice info:

• Valgrind: A Framework for Heavyweight Dynamic Binary Instrumentation
• http://valgrind.org/docs/manual/manual-core-adv.html#manual-core-adv.wrapping

Besides familiarize yourself with LD_PRELOAD.