What are the Windows and Linux native OS/system calls made from malloc()?

Question

I recently saw the following post:

A memory allocator isn\'t lower level than malloc. (The default allocator typically calls malloc directly or indi

Answer 1

malloc() and friends are considered part of the runtime system that comes with a compiler. So each compiler can and does use different OS calls to implement malloc.

As others have said, on Linux the options are sbrk() and mmap().

On Windows the options are HeapAlloc() and VirtualAlloc().