<!--
{
  "availability" : [
    "macOS: 15.4.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "FSKit",
  "identifier" : "/documentation/FSKit/FSSyncFlags",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "FSKit"
    ],
    "preciseIdentifier" : "c:@E@FSSyncFlags"
  },
  "title" : "FSSyncFlags"
}
-->

# FSSyncFlags

Behavior flags for use with synchronization calls.

```
enum FSSyncFlags
```

## Overview

These values are based on flags defined in `mount.h`. Since there are system-defined flags that are valid in the kernel but not in FSKit, this type defines its members as options rather than use an enumeration.

## Topics

### Declaring synchronization behaviors

[`FSSyncFlags.wait`](/documentation/FSKit/FSSyncFlags/wait)

A flag for synchronized I/O with file-integrity completion.

[`FSSyncFlags.noWait`](/documentation/FSKit/FSSyncFlags/noWait)

A flag for synchronized I/O that starts I/O but doesn’t wait for it.

[`FSSyncFlags.dWait`](/documentation/FSKit/FSSyncFlags/dWait)

A flag for synchronized I/O with data-integrity completion.


---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)