Method Readiness

pkg/sentry/socket/plugin/stack/socket.go:264–283

Readiness implements socket.Socket.Readiness.

(mask waiter.EventMask)

// Readiness implements socket.Socket.Readiness.
func (s *socketOperations) Readiness(mask waiter.EventMask) waiter.EventMask {
	var events waiter.EventMask

	evInfo := &s.eventInfo
	iomask := mask & (waiter.EventIn | waiter.EventOut)

	// Fast path condition:
	// 1. The event needed has been reported by plugin stack io-thread; or
	// 2. POLLIN or POLLOUT event has been reported by io-thread.
	// Directly report current event without invoking cgo Readiness again.
	if evInfo.Ready&iomask == iomask {
		events = evInfo.Ready & mask
		// Clear plugin stack eventInfo record after consuming IN/OUT event.
		evInfo.Ready &= ^iomask
	} else {
		events = waiter.EventMask(cgo.Readiness(s.fd, uint64(mask)))
	}

	return events
}

// Epollable implements socket.Socket.Epollable.
func (s *socketOperations) Epollable() bool {