040000 tree 5219eaa7149c2a643c95d7a2032db6bdff11e9cf	cache
040000 tree 8a3c00fe7006f734e8020e8bf5c33f484c0e1014	lru
040000 tree a5cca246b8bf62c6db35dffd0b2b5e0dbc4e3bc2	pingpong
040000 tree e5d4d2f728b77ac9fd816642065343c86853bac1	server
040000 tree 4ebc861070d5110664e623729de492d5e0f3fb85	test_principal
040000 tree 1ef5e830c7450728f02a7df866baff22ab752b0d	unixfd