Fuchsia: Partial implementation of dart:io sockets

runtime/bin/eventhandler_fuchsia.h

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_
 #define RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_
 
 #if !defined(RUNTIME_BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_fuchsia.h directly; use eventhandler.h.
 #endif
 
 #include <errno.h>
-#include <magenta/syscalls.h>
+#include <sys/epoll.h>
+#include <sys/socket.h>
+#include <unistd.h>
 
 #include "platform/signal_blocker.h"
 
 namespace dart {
 namespace bin {
 
 class DescriptorInfo : public DescriptorInfoBase {
  public:
   explicit DescriptorInfo(intptr_t fd) : DescriptorInfoBase(fd) {}
 
   virtual ~DescriptorInfo() {}
 
+  intptr_t GetPollEvents();
+
   virtual void Close() {
-    VOID_TEMP_FAILURE_RETRY(close(fd_));
+    // Should be VOID_TEMP_FAILURE_RETRY
+    VOID_NO_RETRY_EXPECTED(close(fd_));
     fd_ = -1;
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DescriptorInfo);
 };
 
 class DescriptorInfoSingle : public DescriptorInfoSingleMixin<DescriptorInfo> {
  public:
   explicit DescriptorInfoSingle(intptr_t fd)
       : DescriptorInfoSingleMixin(fd, false) {}
   virtual ~DescriptorInfoSingle() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DescriptorInfoSingle);
 };
 
 class DescriptorInfoMultiple
     : public DescriptorInfoMultipleMixin<DescriptorInfo> {
  public:
   explicit DescriptorInfoMultiple(intptr_t fd)
       : DescriptorInfoMultipleMixin(fd, false) {}
   virtual ~DescriptorInfoMultiple() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DescriptorInfoMultiple);
 };
 
-// Information needed to call mx_handle_wait_many(), and to handle events.
-class MagentaWaitManyInfo {
- public:
-  MagentaWaitManyInfo();
-  ~MagentaWaitManyInfo();
-
-  intptr_t capacity() const { return capacity_; }
-  intptr_t size() const { return size_; }
-  DescriptorInfo** descriptor_infos() const { return descriptor_infos_; }
-  mx_wait_item_t* items() const { return items_; }
-
-  void AddHandle(mx_handle_t handle, mx_signals_t signals, DescriptorInfo* di);
-  void RemoveHandle(mx_handle_t handle);
-
- private:
-  static const intptr_t kInitialCapacity = 32;
-
-  void GrowArraysIfNeeded(intptr_t desired_size);
-
-  intptr_t capacity_;
-  intptr_t size_;
-  DescriptorInfo** descriptor_infos_;
-  mx_wait_item_t* items_;
-
-  DISALLOW_COPY_AND_ASSIGN(MagentaWaitManyInfo);
-};
-
 class EventHandlerImplementation {
  public:
   EventHandlerImplementation();
   ~EventHandlerImplementation();
 
+  void UpdateEpollInstance(intptr_t old_mask, DescriptorInfo* di);
+
+  // Gets the socket data structure for a given file
+  // descriptor. Creates a new one if one is not found.
+  DescriptorInfo* GetDescriptorInfo(intptr_t fd, bool is_listening);
   void SendData(intptr_t id, Dart_Port dart_port, int64_t data);
   void Start(EventHandler* handler);
   void Shutdown();
 
-  const MagentaWaitManyInfo& info() const { return info_; }
+ private:
+  static void Poll(uword args);
+  static void* GetHashmapKeyFromFd(intptr_t fd);
+  static uint32_t GetHashmapHashFromFd(intptr_t fd);
 
- private:
   int64_t GetTimeout() const;
-  void HandleEvents();
+  void HandleEvents(struct epoll_event* events, int size);
   void HandleTimeout();
   void WakeupHandler(intptr_t id, Dart_Port dart_port, int64_t data);
+  intptr_t GetPollEvents(intptr_t events, DescriptorInfo* di);
   void HandleInterruptFd();
-  static void Poll(uword args);
 
+  HashMap socket_map_;
   TimeoutQueue timeout_queue_;
   bool shutdown_;
-  mx_handle_t interrupt_handles_[2];
-
-  MagentaWaitManyInfo info_;
+  int interrupt_fds_[2];
+  int epoll_fd_;
 
   DISALLOW_COPY_AND_ASSIGN(EventHandlerImplementation);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // RUNTIME_BIN_EVENTHANDLER_FUCHSIA_H_