IOSysCtlByName

Declaration

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

kIOReturnSuccess if successful, or an IOReturn code indicating the error

Discussion

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