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# SecKeychainCallbackInfo

Information about a keychain event that keychain services deliver to your app via a callback function.

```
struct SecKeychainCallbackInfo
```

## Overview

This structure contains information about the keychain event of which your application wants to be notified. Keychain services pass a pointer to this structure in the `info` parameter of your callback function. For information on how to write a keychain event callback function, see [`SecKeychainCallback`](/documentation/Security/SecKeychainCallback).

## Topics

### Instance Properties

[`item`](/documentation/Security/SecKeychainCallbackInfo/item)

A reference to the keychain item in which the event occurred. If the event did not involve an item, this field is not valid.

[`keychain`](/documentation/Security/SecKeychainCallbackInfo/keychain)

A reference to the keychain in which the event occurred. If the event did not involve a keychain, this field is not valid.

[`pid`](/documentation/Security/SecKeychainCallbackInfo/pid)

The ID of the process that generated this event.

[`version`](/documentation/Security/SecKeychainCallbackInfo/version)

The version of this structure.

### Initializers

[`init(version:item:keychain:pid:)`](/documentation/Security/SecKeychainCallbackInfo/init(version:item:keychain:pid:))

Creates a new keychain callback information structure.


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