The fundamental concept for accessing memory through Umpire is an umpire:Allocator. In C, this means using the type umpire_allocator. There are corresponding functions that take an umpire_allocator and let you allocate and deallocate memory.
As with the native C++ interface, all allocators are accessed via the umpire::ResourceManager. In the C API, there is a corresponding umpire_resourcemanager type. To get an umpire_allocator:
../../../../examples/tutorial/c/tut_allocator.c
Once you have an umpire_allocator, you can use it to allocate and deallocate memory:
../../../../examples/tutorial/c/tut_allocator.c
In the next section, we will see how to allocate memory in different places.