System.UDev.Queue

The udev daemon processes events asynchronously. All events which do not have interdependencies run in parallel. This exports the current state of the event processing queue, and the current event sequence numbers from the kernel and the udev daemon.

Documentation

data Queue

Opaque object representing the current event queue in the udev daemon.

type Seqnum = Int

Sequence number of event.

newQueue :: UDev -> IO Queue

Create a new queue.

isActive :: Queue -> IO Bool

Check if udev is active on the system.

isEmpty :: Queue -> IO Bool

Check if udev is currently processing any events.

isFinished

Arguments

:: Queue

udev queue context

-> Seqnum

sequence number

-> IO Bool

if the given sequence number is currently active.

Check if udev is currently processing a given sequence number.

getPending :: Queue -> IO List

Get the first entry of the list of queued events.

sequenceIsFinished

Arguments

:: Queue

udev queue context

-> Seqnum

first event sequence number

-> Seqnum

last event sequence number

-> IO Bool

if any of the sequence numbers in the given range is currently active

Check if udev is currently processing any events in a given sequence number range.

getKernelSeqnum :: Queue -> IO Seqnum

Get the current kernel event sequence number.

getUDevSeqnum :: Queue -> IO Seqnum

Get the last known udev event sequence number.