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Add uuid_get_fd(2), uuid_get_file(2), and uuid_get_link(2) system calls #61

Closed rwatson closed 7 years ago

rwatson commented 7 years ago

Now that many key file-descriptor-backed objects have UUIDs, add new system calls uuid_get_fd(2), uuid_get_file(2), and uuid_get_link(2) to allow them to be queried by userspace applications.

rwatson commented 7 years ago

I may name these fgetuuid(2), getuuid(2), and lgetuuid(2) for consistency with other similar system calls. Unclear if we'll want at(2) variants.

rwatson commented 7 years ago

In the future we might want to add at(2) variants for improved Capsicum support, but not required to get going.