---
title: IOSysCtlByName
framework: driverkit
role: symbol
role_heading: Function
path: driverkit/iosysctlbyname
---

# IOSysCtlByName

## Declaration

```occ
kern_return_t IOSysCtlByName(const char *name, void *oldp, size_t *oldlenp, void *newp, size_t newlen);
```

## Parameters

- `name`: An ASCII representation of the sysctl vector
- `oldp`: Buffer to receive the system information
- `oldlenp`: Length of the buffer receiving the system information
- `newp`: Buffer containing the value to be set
- `newlen`: Length of the buffer containing the value to be set

## Return Value

Return Value kIOReturnSuccess if successful, or an IOReturn code indicating the error

## Discussion

Discussion Get or set system information. Depending on the sysctl vector, only priviledged drivers might be able to set certain system information.