Add ChildPortServer, a MachMessageServer::Interface implementation for the child_port subsystem

util/mach/child_port_server.h

+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_UTIL_MACH_CHILD_PORT_SERVER_H_
+#define CRASHPAD_UTIL_MACH_CHILD_PORT_SERVER_H_
+
+#include <mach/mach.h>
+
+#include "base/basictypes.h"
+#include "util/mach/child_port_types.h"
+#include "util/mach/mach_message_server.h"
+
+namespace crashpad {
+
+//! \brief A server interface for the `child_port` Mach subsystem.
+class ChildPortServer : public MachMessageServer::Interface {
+ public:
+  //! \brief An interface that the request message that is a part of the
+  //!     `child_port` Mach subsystem can be dispatched to.
+  class Interface {
+   public:
+    //! \brief Handles check-ins sent by `child_port_check_in()`.
+    //!
+    //! This behaves equivalently to a `handle_child_port_check_in()` function
+    //! used with `child_port_server()`.
+    //!
+    //! \param[out] destroy_request `true` if the request message is to be
+    //!     destroyed even when this method returns success. See
+    //!     MachMessageServer::Interface.
+    virtual kern_return_t HandleChildPortCheckIn(
+        child_port_server_t server,
+        const child_port_token_t token,
+        mach_port_t port,
+        mach_msg_type_name_t right_type,
+        bool* destroy_complex_request) = 0;
+
+   protected:
+    ~Interface() {}
+  };
+
+  //! \brief Constructs an object of this class.
+  //!
+  //! \param[in] interface The interface to dispatch requests to. Weak.
+  explicit ChildPortServer(Interface* interface);
+
+  // MachMessageServer::Interface:
+
+  bool MachMessageServerFunction(const mach_msg_header_t* in_header,
+                                 mach_msg_header_t* out_header,
+                                 bool* destroy_complex_request) override;
+
+  mach_msg_size_t MachMessageServerRequestSize() override;
+  mach_msg_size_t MachMessageServerReplySize() override;
+
+ private:
+  Interface* interface_;  // weak
+
+  DISALLOW_COPY_AND_ASSIGN(ChildPortServer);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_UTIL_MACH_CHILD_PORT_SERVER_H_