---
title: os_activity_get_identifier
framework: os
role: symbol
role_heading: Function
platforms: [iOS 10.0+, iPadOS 10.0+, Mac Catalyst 13.1+, macOS 10.12+, tvOS 10.0+, visionOS 1.0+, watchOS 3.0+]
path: os/os_activity_get_identifier
---

# os_activity_get_identifier

Retrieves the identifier for a given activity object.

## Declaration

```occ
extern os_activity_id_t os_activity_get_identifier(os_activity_t activity, os_activity_id_t *parent_id);
```

## Parameters

- `activity`: The activity to be identified.
- `parent_id`: On return, contains the identifier of the parent of the activity object, if any. Pass NULL if you don’t need this identifier.

## Return Value

Return Value The current activity identifier.

## See Also

### Retrieving an Activity Identifier

- [os_activity_id_t](os/os_activity_id_t.md)