[NaCl SDK] nacl_io: Add support for basic socketpairs.

native_client_sdk/src/libraries/nacl_io/socket/unix_socketpair_node.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef LIBRARIES_NACL_IO_SOCKET_UNIX_SOCKETPAIR_NODE_H_
+#define LIBRARIES_NACL_IO_SOCKET_UNIX_SOCKETPAIR_NODE_H_
+
+#include "nacl_io/ossocket.h"
+#ifdef PROVIDES_SOCKET_API
+
+#include "nacl_io/node.h"
+#include "nacl_io/socket/socket_node.h"
+#include "nacl_io/socket/unix_event_emitter.h"
+
+namespace nacl_io {
+
+class UnixSocketpairNode : public SocketNode {
+ public:
+  explicit UnixSocketpairNode(Filesystem* filesystem);

[Sam Clegg, 2015/09/17 09:40:39]

Should we just call this UnixSocketNode, since it doesn't represent the both
nodes in the pair does it?

How about "unixsocket_node.h"?

[avallee, 2015/09/17 16:18:01]

Sounds fair.

[binji, 2015/09/18 23:30:13]

Please rename the class as well.

+  UnixSocketpairNode(Filesystem* filesystem, const UnixSocketpairNode& peer);
+
+  virtual EventEmitter* GetEventEmitter();
+
+ protected:
+  virtual Error Recv_Locked(void* buffer,
+                            size_t len,
+                            PP_Resource* out_addr,
+                            int* out_len);
+  virtual Error Send_Locked(const void* buffer,
+                            size_t len,
+                            PP_Resource addr,
+                            int* out_len);
+  virtual Error RecvFrom(const HandleAttr& attr,
+                         void* buf,
+                         size_t len,
+                         int flags,
+                         struct sockaddr* src_addr,
+                         socklen_t* addrlen,
+                         int* out_len);
+  virtual Error Send(const HandleAttr& attr,
+                     const void* buf,
+                     size_t len,
+                     int flags,
+                     int* out_len);
+  virtual Error SendTo(const HandleAttr& attr,
+                       const void* buf,
+                       size_t len,
+                       int flags,
+                       const struct sockaddr* dest_addr,
+                       socklen_t addrlen,
+                       int* out_len);
+ private:
+  ScopedUnixEventEmitter emitter_;
+};
+
+}  // namespace nacl_io
+
+#endif  // PROVIDES_SOCKET_API
+#endif  // LIBRARIES_NACL_IO_SOCKET_UNIX_SOCKETPAIR_NODE_H_