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

one use

	golang.org/x/sys/unix (current package)
		zerrors_linux.go#L2684: 	PTP_EXTTS_VALID_FLAGS                       = 0x1f

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