---
title: "sec_protocol_options_set_challenge_block(_:_:_:)"
framework: security
role: symbol
role_heading: Function
path: "security/sec_protocol_options_set_challenge_block(_:_:_:)"
---

# sec_protocol_options_set_challenge_block(_:_:_:)

## Declaration

```swift
func sec_protocol_options_set_challenge_block(_ options: sec_protocol_options_t, _ challenge_block: @escaping sec_protocol_challenge_t, _ challenge_queue: dispatch_queue_t)
```

## Parameters

- `options`: A sec_protocol_options_t instance.

## Discussion

Discussion Set the challenge block.  A `sec_protocol_challenge_t` block.  A `dispatch_queue_t` on which the challenge block should be called.