const golang.org/x/sys/unix.SizeofSockaddrInet4

2 uses

	golang.org/x/sys/unix (current package)
		syscall_bsd.go#L145: 	sa.raw.Len = SizeofSockaddrInet4
		ztypes_darwin_arm64.go#L260: 	SizeofSockaddrInet4    = 0x10

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