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

Kernel/Net/Socket.h

@@ -0,0 +1,114 @@
+#pragma once
+
+#include <Kernel/Lock.h>
+#include <AK/Retainable.h>
+#include <AK/RetainPtr.h>
+#include <AK/HashTable.h>
+#include <AK/Vector.h>
+#include <Kernel/UnixTypes.h>
+#include <Kernel/KResult.h>
+
+enum class SocketRole { None, Listener, Accepted, Connected, Connecting };
+
+class Socket : public Retainable<Socket> {
+public:
+    static KResultOr<Retained<Socket>> create(int domain, int type, int protocol);
+    virtual ~Socket();
+
+    int domain() const { return m_domain; }
+    int type() const { return m_type; }
+    int protocol() const { return m_protocol; }
+
+    bool can_accept() const { return !m_pending.is_empty(); }
+    RetainPtr<Socket> accept();
+    bool is_connected() const { return m_connected; }
+    KResult listen(int backlog);
+
+    virtual KResult bind(const sockaddr*, socklen_t) = 0;
+    virtual KResult connect(const sockaddr*, socklen_t) = 0;
+    virtual bool get_address(sockaddr*, socklen_t*) = 0;
+    virtual bool is_local() const { return false; }
+    virtual bool is_ipv4() const { return false; }
+    virtual void attach_fd(SocketRole) = 0;
+    virtual void detach_fd(SocketRole) = 0;
+    virtual bool can_read(SocketRole) const = 0;
+    virtual ssize_t read(SocketRole, byte*, ssize_t) = 0;
+    virtual ssize_t write(SocketRole, const byte*, ssize_t) = 0;
+    virtual bool can_write(SocketRole) const = 0;
+    virtual ssize_t sendto(const void*, size_t, int flags, const sockaddr*, socklen_t) = 0;
+    virtual ssize_t recvfrom(void*, size_t, int flags, sockaddr*, socklen_t*) = 0;
+
+    KResult setsockopt(int level, int option, const void*, socklen_t);
+    KResult getsockopt(int level, int option, void*, socklen_t*);
+
+    pid_t origin_pid() const { return m_origin_pid; }
+
+    timeval receive_deadline() const { return m_receive_deadline; }
+    timeval send_deadline() const { return m_send_deadline; }
+
+    void set_connected(bool connected) { m_connected = connected; }
+
+    Lock& lock() { return m_lock; }
+
+protected:
+    Socket(int domain, int type, int protocol);
+
+    KResult queue_connection_from(Socket&);
+
+    void load_receive_deadline();
+    void load_send_deadline();
+
+private:
+    Lock m_lock;
+    pid_t m_origin_pid { 0 };
+    int m_domain { 0 };
+    int m_type { 0 };
+    int m_protocol { 0 };
+    int m_backlog { 0 };
+    bool m_connected { false };
+
+    timeval m_receive_timeout { 0, 0 };
+    timeval m_send_timeout { 0, 0 };
+
+    timeval m_receive_deadline { 0, 0 };
+    timeval m_send_deadline { 0, 0 };
+
+    Vector<RetainPtr<Socket>> m_pending;
+};
+
+class SocketHandle {
+public:
+    SocketHandle() { }
+
+    SocketHandle(RetainPtr<Socket>&& socket)
+        : m_socket(move(socket))
+    {
+        if (m_socket)
+            m_socket->lock().lock();
+    }
+
+    SocketHandle(SocketHandle&& other)
+        : m_socket(move(other.m_socket))
+    {
+    }
+
+    ~SocketHandle()
+    {
+        if (m_socket)
+            m_socket->lock().unlock();
+    }
+
+    SocketHandle(const SocketHandle&) = delete;
+    SocketHandle& operator=(const SocketHandle&) = delete;
+
+    operator bool() const { return m_socket; }
+
+    Socket* operator->() { return &socket(); }
+    const Socket* operator->() const { return &socket(); }
+
+    Socket& socket() { return *m_socket; }
+    const Socket& socket() const { return *m_socket; }
+
+private:
+    RetainPtr<Socket> m_socket;
+};