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#+title: Handles
* filesystem / access function front handle
See vfs.org.
can be used in: mount()
returned by fs_create(). there could also be functions that created a front handle from a subset of the current vfs.
* filesystem / access function back handle
can be used in: fs_wait()
returned by fs_create()
* file handle
When an access function accepts a path, it returns a number uniquely identifying that open file. The kernel then wraps it in a file handle which gets passed back to the original caller.
can be used in: read(), write(), maybe there could be a syscall allowing any other custom operation
returned by open()
* shared operations
pass to parent / wait for handle from child
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