---
title: vfs_issynchronous
framework: Kernel
role: symbol
role_heading: Function
platforms: [macOS 10.4+]
path: kernel/1523327-vfs_issynchronous
---

# vfs_issynchronous

Determine if writes to a filesystem occur synchronously.

## Declaration

```occ
int vfs_issynchronous(mount_t mp);
```

## Parameters

- `mp`: Mount to test.

## Return Value

Return Value Nonzero if writes occur synchronously, else 0.