1 files changed, 66 insertions, 0 deletions
diff --git a/kernel/include/kernel/filesystem/open_file_table.hpp b/kernel/include/kernel/filesystem/open_file_table.hpp
new file mode 100644
index 0000000..7e754ac
--- /dev/null
+++ b/kernel/include/kernel/filesystem/open_file_table.hpp
@@ -0,0 +1,66 @@
+#ifndef TEACH_OS_KERNEL_FILESYSTEM_OPEN_FILE_TABLE_HPP
+#define TEACH_OS_KERNEL_FILESYSTEM_OPEN_FILE_TABLE_HPP
+
+#include <kernel/filesystem/open_file_descriptor.hpp>
+
+#include <kstd/memory>
+#include <kstd/unikstd.h>
+#include <kstd/vector>
+
+#include <cstddef>
+
+namespace kernel::filesystem
+{
+  /**
+  @brief A table for managing file descriptors in the filesystem. This class provides methods for adding, retrieving,
+  and removing open file descriptors.
+  */
+  struct open_file_table
+  {
+    /**
+    @brief Initialize the global open file table. This method creates the singleton instance of the open file table.
+    @warning Panics if called more than once.
+    */
+    auto static init() -> void;
+
+    /**
+    @brief Get the global open file table instance.
+    @return A reference to the global open file table.
+    @warning Panics if the open file table has not been initialized.
+    */
+    auto static get() -> open_file_table &;
+
+    /**
+    @brief Destructor for the open file table.
+    */
+    ~open_file_table() = default;
+
+    /**
+    @brief Add a file to the open file table.
+    @param fd The file descriptor to add.
+    @return The file descriptor index assigned to the file, or -1 on failure.
+    */
+    auto add_file(kstd::shared_ptr<open_file_descriptor> const & fd) -> kstd::ssize_t;
+
+    /**
+    @brief Get a file from the open file table.
+    @param fd The file descriptor index to retrieve.
+    @return A pointer to the requested file descriptor, or a null pointer if not found.
+    */
+    [[nodiscard]] auto file(size_t fd) const -> kstd::shared_ptr<open_file_descriptor>;
+
+    /**
+    @brief Remove a file from the open file table.
+    @param fd The file descriptor index to remove.
+    @return 0 on success, or -1 on failure.
+    */
+    auto remove_file(size_t fd) -> kstd::ssize_t;
+
+  private:
+    open_file_table() = default;
+
+    kstd::vector<kstd::shared_ptr<open_file_descriptor>> m_open_files{};
+  };
+}  // namespace kernel::filesystem
+
+#endif
+\ No newline at end of file