System.BSD.Sysctl

This module allows access to the BSD sysctl(3) interface via the Haskell FFI.

Convenience functions to read and write the usual sysctl types are provided, as well as more advanced functions to handle binary values given a suitable Storable instance. It is also possible to retrieve data whose size changes at runtime with the sysctlPeekArray function.

Nodes may be queried either by their name, their OID as a list of Ints, or by an OID returned by sysctlNameToOid if speed is a concern.

The data types

class SysctlKey k

Instances

SysctlKey String

SysctlKey OID

SysctlKey [Int]

data OID

Instances

SysctlKey OID

Name to OID conversion

sysctlNameToOid :: String -> IO OID

Basic reading functions

sysctlReadInt :: SysctlKey k => k -> IO Int32

sysctlReadUInt :: SysctlKey k => k -> IO Word32

sysctlReadLong :: SysctlKey k => k -> IO Int32

sysctlReadULong :: SysctlKey k => k -> IO Word32

sysctlReadQuad :: SysctlKey k => k -> IO Int64

sysctlReadUQuad :: SysctlKey k => k -> IO Word64

sysctlReadString :: SysctlKey k => k -> IO String

Advanced reading functions

sysctlPeek :: forall k a. (SysctlKey k, Storable a) => k -> IO a

sysctlPeekArray :: forall k a. (SysctlKey k, Storable a) => k -> IO [a]

Basic writing functions

sysctlWriteInt :: SysctlKey k => k -> Int32 -> IO ()

sysctlWriteUInt :: SysctlKey k => k -> Word32 -> IO ()

sysctlWriteLong :: SysctlKey k => k -> Int32 -> IO ()

sysctlWriteULong :: SysctlKey k => k -> Word32 -> IO ()

sysctlWriteQuad :: SysctlKey k => k -> Int64 -> IO ()

sysctlWriteUQuad :: SysctlKey k => k -> Word64 -> IO ()

sysctlWriteString :: SysctlKey k => k -> String -> IO ()

Advanced writing functions

sysctlPoke :: (SysctlKey k, Storable a) => k -> a -> IO ()