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# DARegisterDiskMountApprovalCallback(_:_:_:_:)

Registers a callback function to be called whenever a volume is to be mounted.

```
func DARegisterDiskMountApprovalCallback(_ session: DASession, _ match: CFDictionary?, _ callback: DADiskMountApprovalCallback, _ context: UnsafeMutableRawPointer?)
```

## Parameters

`session`

The session object.

`match`

The disk description keys to match. Pass NULL for all disk objects.

`callback`

The callback function to call when a volume is to be mounted.

`context`

The user-defined context parameter to pass to the callback function.

## Discussion

---

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