How does the operating system determine which region to allocate when lpAddress is null in VirtualAlloc

Question

When the lpAddress parameter to a VirtualAlloc function call is null, how does the OS determine which virtual address space region to allocate?

Answer 1

When VirtualAlloc function is given NULL for lpAddress parameter, the function will allocate in another Virtual Page ahead, and the allocation size will be rounded to that page boundary.

Resources:

• VirtualAlloc function reference

• A stackoverflow post that has related useful info

Hope this helps