Adds a observer to either this node, or to a child of this node.
Pointer to the IVfsNode interface object
Remainder of the path to the requested node
The observer to add to the node
int IVFSNODE_AddObserver(IVfsNode * po,VfsPath path,VfsObserver * ob)
SUCCESS, or error code
The observer function will be called when the value held by the node changes.
If at end of path, then the observer will be attached to
If called on a non-container node and the supplied path is not at
the end of path, the call will fail.
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