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#pragma once
#include <AK/Badge.h>
#include <AK/ByteBuffer.h>
#include <AK/CircularQueue.h>
#include <AK/Retainable.h>
#include <Kernel/FileSystem/FIFO.h>
#include <Kernel/FileSystem/Inode.h>
#include <Kernel/FileSystem/InodeMetadata.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/LinearAddress.h>
#include <Kernel/Net/Socket.h>
class File;
class TTY;
class MasterPTY;
class Process;
class Region;
class CharacterDevice;
class SharedMemory;
class FileDescriptor : public Retainable<FileDescriptor> {
public:
static Retained<FileDescriptor> create(RetainPtr<Custody>&&);
static Retained<FileDescriptor> create(RetainPtr<File>&&, SocketRole = SocketRole::None);
~FileDescriptor();
Retained<FileDescriptor> clone();
int close();
off_t seek(off_t, int whence);
ssize_t read(byte*, ssize_t);
ssize_t write(const byte* data, ssize_t);
KResult fstat(stat&);
KResult fchmod(mode_t);
bool can_read();
bool can_write();
ssize_t get_dir_entries(byte* buffer, ssize_t);
ByteBuffer read_entire_file();
String absolute_path();
bool is_directory() const;
File& file() { return *m_file; }
const File& file() const { return *m_file; }
bool is_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(); }
Custody* custody() { return m_custody.ptr(); }
const Custody* custody() const { return m_custody.ptr(); }
KResultOr<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; }
bool should_append() const { return m_should_append; }
void set_should_append(bool s) { m_should_append = s; }
dword file_flags() const { return m_file_flags; }
void set_file_flags(dword);
bool is_socket() const;
Socket* socket();
const Socket* socket() const;
bool is_fifo() const;
FIFO* fifo();
FIFO::Direction fifo_direction() { return m_fifo_direction; }
void set_fifo_direction(Badge<FIFO>, FIFO::Direction direction) { m_fifo_direction = direction; }
bool is_shared_memory() const;
SharedMemory* shared_memory();
const SharedMemory* shared_memory() const;
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);
KResult truncate(off_t);
off_t offset() const { return m_current_offset; }
private:
friend class VFS;
FileDescriptor(RetainPtr<File>&&, SocketRole = SocketRole::None);
FileDescriptor(FIFO&, FIFO::Direction);
RetainPtr<Custody> m_custody;
RetainPtr<Inode> m_inode;
RetainPtr<File> m_file;
off_t m_current_offset { 0 };
ByteBuffer m_generator_cache;
dword m_file_flags { 0 };
bool m_is_blocking { true };
bool m_should_append { false };
SocketRole m_socket_role { SocketRole::None };
FIFO::Direction m_fifo_direction { FIFO::Direction::Neither };
};
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