'Relation between shm_open and mmap?

I have read many shm_open docs. All of the docs are showing how it should be used with mmap. I didn't get why it should be used with mmap? What does mmap do extra from shm_open? The docs states:

shm_open() is analogous to that of open().

If this is true, then why can't I read/write directly to the shared memory object, just like regular files with open(). If shm_open and mmap should always be used together, why they didn't just merge them into one API?

linuxshared-memorymmapmemory-mapped-files


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