Kernel/LibC: Implement basic epoll

This implementation is on top of inodes instead of fds as linux does it.
If I start finding ports/software that relies on epoll allowing
duplicate inodes, I will do what linux does.

I'm probably missing multiple epoll_notify's which may cause hangs but
the system seems to work fine :dd:

kernel/include/kernel/Storage/NVMe/Controller.h

@@ -27,6 +27,7 @@ namespace Kernel
 		virtual bool can_read_impl() const override { return false; }
 		virtual bool can_write_impl() const override { return false; }
 		virtual bool has_error_impl() const override { return false; }
+		virtual bool has_hangup_impl() const override { return false; }
 
 	private:
 		NVMeController(PCI::Device& pci_device);

kernel/include/kernel/Storage/NVMe/Namespace.h

@@ -17,7 +17,7 @@ namespace Kernel
 		virtual uint64_t total_size() const override { return m_block_size * m_block_count; }
 
 		virtual dev_t rdev() const override { return m_rdev; }
-		virtual BAN::StringView name() const { return m_name; }
+		virtual BAN::StringView name() const override { return m_name; }
 
 	private:
 		NVMeNamespace(NVMeController&, uint32_t ns_index, uint32_t nsid, uint64_t block_count, uint32_t block_size);

kernel/include/kernel/Storage/Partition.h

@@ -53,6 +53,7 @@ namespace Kernel
 		virtual bool can_read_impl() const override { return true; }
 		virtual bool can_write_impl() const override { return true; }
 		virtual bool has_error_impl() const override { return false; }
+		virtual bool has_hangup_impl() const override { return false; }
 
 	private:
 		const dev_t m_rdev;

kernel/include/kernel/Storage/StorageDevice.h

@@ -47,6 +47,7 @@ namespace Kernel
 		virtual bool can_read_impl() const override { return true; }
 		virtual bool can_write_impl() const override { return true; }
 		virtual bool has_error_impl() const override { return false; }
+		virtual bool has_hangup_impl() const override { return false; }
 
 	private:
 		Mutex								m_mutex;