ref: https://blog.rchapman.org/posts/Linux_System_Call_Table_for_x86_64/
Finish trying to get sbrk to replace malloc / realloc / free.
- First, make it work with just sbrk (manually reallocate).
- Then, conclude that free / real realloc is hard.
Look at how sbrk works with the syscall actually being brk. Look at the bottom of the manpage to see how to get current brk.
Overflow:
- Start talking about data structures in C.
