Kernel: Move FIFO into FileSystem/ and Socket+LocalSocket into Net/.

Kernel/FileSystem/FileDescriptor.h

@@ -0,0 +1,120 @@
+#pragma once
+
+#include <Kernel/FileSystem/VirtualFileSystem.h>
+#include <Kernel/FileSystem/InodeMetadata.h>
+#include <Kernel/FileSystem/FIFO.h>
+#include <Kernel/LinearAddress.h>
+#include <AK/ByteBuffer.h>
+#include <AK/CircularQueue.h>
+#include <AK/Retainable.h>
+#include <AK/Badge.h>
+#include <Kernel/Net/Socket.h>
+
+class TTY;
+class MasterPTY;
+class Process;
+class Region;
+class CharacterDevice;
+
+class FileDescriptor : public Retainable<FileDescriptor> {
+public:
+
+    static Retained<FileDescriptor> create(RetainPtr<Socket>&&, SocketRole = SocketRole::None);
+    static Retained<FileDescriptor> create(RetainPtr<Inode>&&);
+    static Retained<FileDescriptor> create(RetainPtr<Device>&&);
+    static Retained<FileDescriptor> create_pipe_writer(FIFO&);
+    static Retained<FileDescriptor> create_pipe_reader(FIFO&);
+    ~FileDescriptor();
+
+    Retained<FileDescriptor> clone();
+
+    int close();
+
+    off_t seek(off_t, int whence);
+    ssize_t read(Process&, byte*, ssize_t);
+    ssize_t write(Process&, const byte* data, ssize_t);
+    KResult fstat(stat&);
+
+    KResult fchmod(mode_t);
+
+    bool can_read(Process&);
+    bool can_write(Process&);
+
+    ssize_t get_dir_entries(byte* buffer, ssize_t);
+
+    ByteBuffer read_entire_file(Process&);
+
+    KResultOr<String> absolute_path();
+
+    bool is_directory() const;
+
+    bool is_device() const { return m_device.ptr(); }
+    Device* device() { return m_device.ptr(); }
+    const Device* device() const { return m_device.ptr(); }
+
+    bool is_block_device() const;
+    bool is_character_device() const;
+    CharacterDevice* character_device();
+    const CharacterDevice* character_device() const;
+
+    bool is_tty() const;
+    const TTY* tty() const;
+    TTY* tty();
+
+    bool is_master_pty() const;
+    const MasterPTY* master_pty() const;
+    MasterPTY* master_pty();
+
+    InodeMetadata metadata() const;
+    Inode* inode() { return m_inode.ptr(); }
+    const Inode* inode() const { return m_inode.ptr(); }
+
+    bool supports_mmap() const;
+    Region* mmap(Process&, LinearAddress, size_t offset, size_t, int prot);
+
+    bool is_blocking() const { return m_is_blocking; }
+    void set_blocking(bool b) { m_is_blocking = b; }
+
+    dword file_flags() const { return m_file_flags; }
+    void set_file_flags(dword flags) { m_file_flags = flags; }
+
+    bool is_socket() const { return m_socket; }
+    Socket* socket() { return m_socket.ptr(); }
+    const Socket* socket() const { return m_socket.ptr(); }
+
+    bool is_fifo() const { return m_fifo; }
+    FIFO::Direction fifo_direction() { return m_fifo_direction; }
+
+    ByteBuffer& generator_cache() { return m_generator_cache; }
+
+    void set_original_inode(Badge<VFS>, Retained<Inode>&& inode) { m_inode = move(inode); }
+
+    SocketRole socket_role() const { return m_socket_role; }
+    void set_socket_role(SocketRole);
+
+private:
+    friend class VFS;
+    FileDescriptor(RetainPtr<Socket>&&, SocketRole);
+    explicit FileDescriptor(RetainPtr<Inode>&&);
+    explicit FileDescriptor(RetainPtr<Device>&&);
+    FileDescriptor(FIFO&, FIFO::Direction);
+
+    RetainPtr<Inode> m_inode;
+    RetainPtr<Device> m_device;
+
+    off_t m_current_offset { 0 };
+
+    ByteBuffer m_generator_cache;
+
+    bool m_is_blocking { true };
+    dword m_file_flags { 0 };
+
+    RetainPtr<Socket> m_socket;
+    SocketRole m_socket_role { SocketRole::None };
+
+    RetainPtr<FIFO> m_fifo;
+    FIFO::Direction m_fifo_direction { FIFO::Neither };
+
+    bool m_closed { false };
+};
+