---
title: backtrace_user_copy_fn
framework: Kernel
role: symbol
role_heading: Type Alias
platforms: [macOS 12.0+]
path: kernel/backtrace_user_copy_fn
---

# backtrace_user_copy_fn

## Declaration

```occ
typedef errno_t (*backtrace_user_copy_fn)(void *ctx, void *dst, user_addr_t src, size_t size);
```