Refactor unix domain socket.

net/socket/unix_domain_listen_socket_posix.h

+// Copyright (c) 2012 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 NET_SOCKET_UNIX_DOMAIN_LISTEN_SOCKET_POSIX_H_
+#define NET_SOCKET_UNIX_DOMAIN_LISTEN_SOCKET_POSIX_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/callback_forward.h"
+#include "base/compiler_specific.h"
+#include "base/macros.h"
+#include "build/build_config.h"
+#include "net/base/net_export.h"
+#include "net/socket/stream_listen_socket.h"
+#include "net/socket/unix_domain_server_socket_posix.h"
+
+#if defined(OS_ANDROID) || defined(OS_LINUX)
+// Feature only supported on Linux currently. This lets the Unix Domain Socket
+// not be backed by the file system.
+#define SOCKET_ABSTRACT_NAMESPACE_SUPPORTED
+#endif
+
+namespace net {
+
+// Unix Domain Socket Implementation. Supports abstract namespaces on Linux.
+class NET_EXPORT UnixDomainListenSocket : public StreamListenSocket {
+ public:
+  typedef UnixDomainServerSocket::AuthCallback AuthCallback;
+
+  virtual ~UnixDomainListenSocket();
+
+  // Note that the returned UnixDomainListenSocket instance does not take
+  // ownership of |del|.
+  static scoped_ptr<UnixDomainListenSocket> CreateAndListen(
+      const std::string& path,
+      StreamListenSocket::Delegate* del,
+      const AuthCallback& auth_callback);
+
+#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
+  // Same as above except that the created socket uses the abstract namespace
+  // which is a Linux-only feature. If |fallback_path| is not empty,
+  // make the second attempt with the provided fallback name.
+  static scoped_ptr<UnixDomainListenSocket>
+  CreateAndListenWithAbstractNamespace(
+      const std::string& path,
+      const std::string& fallback_path,
+      StreamListenSocket::Delegate* del,
+      const AuthCallback& auth_callback);
+#endif
+
+ private:
+  UnixDomainListenSocket(SocketDescriptor s,
+                         StreamListenSocket::Delegate* del,
+                         const AuthCallback& auth_callback);
+
+  static scoped_ptr<UnixDomainListenSocket> CreateAndListenInternal(
+      const std::string& path,
+      const std::string& fallback_path,
+      StreamListenSocket::Delegate* del,
+      const AuthCallback& auth_callback,
+      bool use_abstract_namespace);
+
+  // StreamListenSocket:
+  virtual void Accept() OVERRIDE;
+
+  AuthCallback auth_callback_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnixDomainListenSocket);
+};
+
+// Factory that can be used to instantiate UnixDomainListenSocket.
+class NET_EXPORT UnixDomainListenSocketFactory
+    : public StreamListenSocketFactory {
+ public:
+  // Note that this class does not take ownership of the provided delegate.
+  UnixDomainListenSocketFactory(
+      const std::string& path,
+      const UnixDomainListenSocket::AuthCallback& auth_callback);
+  virtual ~UnixDomainListenSocketFactory();
+
+  // StreamListenSocketFactory:
+  virtual scoped_ptr<StreamListenSocket> CreateAndListen(
+      StreamListenSocket::Delegate* delegate) const OVERRIDE;
+
+ protected:
+  const std::string path_;
+  const UnixDomainListenSocket::AuthCallback auth_callback_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(UnixDomainListenSocketFactory);
+};
+
+#if defined(SOCKET_ABSTRACT_NAMESPACE_SUPPORTED)
+// Use this factory to instantiate UnixDomainListenSocket using the abstract
+// namespace feature (only supported on Linux).
+class NET_EXPORT UnixDomainListenSocketWithAbstractNamespaceFactory
+    : public UnixDomainListenSocketFactory {
+ public:
+  UnixDomainListenSocketWithAbstractNamespaceFactory(
+      const std::string& path,
+      const std::string& fallback_path,
+      const UnixDomainListenSocket::AuthCallback& auth_callback);
+  virtual ~UnixDomainListenSocketWithAbstractNamespaceFactory();
+
+  // UnixDomainListenSocketFactory:
+  virtual scoped_ptr<StreamListenSocket> CreateAndListen(
+      StreamListenSocket::Delegate* delegate) const OVERRIDE;
+
+ private:
+  std::string fallback_path_;
+
+  DISALLOW_COPY_AND_ASSIGN(UnixDomainListenSocketWithAbstractNamespaceFactory);
+};
+#endif
+
+}  // namespace net
+
+#endif  // NET_SOCKET_UNIX_DOMAIN_LISTEN_SOCKET_POSIX_H_