---
title: kUnicodeFallbackInterruptSafeMask
framework: Core Services
role: symbol
role_heading: Enumeration Case
platforms: [Mac Catalyst 17.0+, macOS 10.0+]
path: coreservices/1433622-unicode_fallback_sequencing_mask/kunicodefallbackinterruptsafemask
---

# kUnicodeFallbackInterruptSafeMask

Indicate that the caller’s fallback routine doesn’t move memory.

## Declaration

```occ
kUnicodeFallbackInterruptSafeMask = 1L << 2
```