const golang.org/x/sys/unix.PTP_PEROUT_DUTY_CYCLE

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2688: 	PTP_PEROUT_DUTY_CYCLE                       = 0x2

The pages are generated with Golds v0.7.6. (GOOS=linux GOARCH=amd64)