---
title: noFunction
framework: system
role: symbol
role_heading: Type Property
path: system/errno/nofunction
---

# noFunction

Function not implemented.

## Declaration

```swift
static var noFunction: Errno { get }
```

## Mentioned in

Adopting Swift Error Constants

## Discussion

Discussion You attempted a system call that isn’t available on this system. The corresponding C error is ENOSYS.

## See Also

### System Call Errors

- [alreadyInProcess](system/errno/alreadyinprocess.md)
- [badAddress](system/errno/badaddress.md)
- [interrupted](system/errno/interrupted.md)
- [invalidArgument](system/errno/invalidargument.md)
- [nowInProgress](system/errno/nowinprogress.md)
- [resourceBusy](system/errno/resourcebusy.md)
- [resourceTemporarilyUnavailable](system/errno/resourcetemporarilyunavailable.md)