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040000 tree 3a97a93309d353e7873347b9b24127f68988e659	ipc
040000 tree 65fcd5e6367d98a30abd361c0d026dd0555c89d3	lockfile
040000 tree 8a3c00fe7006f734e8020e8bf5c33f484c0e1014	lru
040000 tree aabff57e0223eb4d3ae566770ffc02900626b6f9	pingpong
040000 tree 287edbcfec1685921f912b8433d8f6f31930592a	server
040000 tree a9b3e982de7e43a179e101efa743100edca2e0e5	test_principal