References: syscall.SYS_RECVMSG

const syscall.SYS_RECVMSG_NOCANCEL

one use

	syscall (current package)
		zsysnum_darwin_arm64.go#L319: 	SYS_RECVMSG_NOCANCEL               = 401

The pages are generated with Golds v0.2.8-preview. (GOOS=darwin GOARCH=arm64)