MessageQueue.OnFileDescriptorEventListener

EVENT_ERROR

int EVENT_ERROR

File descriptor event: Indicates that the file descriptor encountered a fatal error.

File descriptor errors can occur for various reasons. One common error is when the remote peer of a socket or pipe closes its end of the connection.

This event may be generated at any time regardless of whether the EVENT_ERROR event mask was specified when the listener was added.

Constant Value: 4 (0x00000004)

EVENT_INPUT

int EVENT_INPUT

File descriptor event: Indicates that the file descriptor is ready for input operations, such as reading.

The listener should read all available data from the file descriptor then return true to keep the listener active or false to remove the listener.

In the case of a socket, this event may be generated to indicate that there is at least one incoming connection that the listener should accept.

This event will only be generated if the EVENT_INPUT event mask was specified when the listener was added.

Constant Value: 1 (0x00000001)

EVENT_OUTPUT

int EVENT_OUTPUT

File descriptor event: Indicates that the file descriptor is ready for output operations, such as writing.

The listener should write as much data as it needs. If it could not write everything at once, then it should return true to keep the listener active. Otherwise, it should return false to remove the listener then re-register it later when it needs to write something else.

This event will only be generated if the EVENT_OUTPUT event mask was specified when the listener was added.

Constant Value: 2 (0x00000002)

onFileDescriptorEvents

int onFileDescriptorEvents (FileDescriptor fd, 
                int events)

Called when a file descriptor receives events.