crash_generation_server.h

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// Copyright (c) 2010 Google Inc.
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
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#ifndef GOOGLE_BREAKPAD_CLIENT_MAC_CRASH_GENERATION_CRASH_GENERATION_SERVER_H_
#define GOOGLE_BREAKPAD_CLIENT_MAC_CRASH_GENERATION_CRASH_GENERATION_SERVER_H_

#include <stdint.h>

#include <string>

#include "common/mac/MachIPC.h"

namespace google_breakpad {

class ClientInfo;

// Messages the server can read via its mach port
enum {
  kDumpRequestMessage     = 1,
  kAcknowledgementMessage = 2,
  kQuitMessage            = 3
};

// Exception details sent by the client when requesting a dump.
struct ExceptionInfo {
  int32_t exception_type;
  int32_t exception_code;
  int32_t exception_subcode;
};

class CrashGenerationServer {
 public:
  // WARNING: callbacks may be invoked on a different thread
  // than that which creates the CrashGenerationServer.  They must
  // be thread safe.
  typedef void (*OnClientDumpRequestCallback)(void *context,
                                              const ClientInfo &client_info,
                                              const std::string &file_path);

  typedef void (*OnClientExitingCallback)(void *context,
                                          const ClientInfo &client_info);
  // If a FilterCallback returns false, the dump will not be written.
  typedef bool (*FilterCallback)(void *context);

  // Create an instance with the given parameters.
  //
  // mach_port_name: Named server port to listen on.
  // filter: Callback for a client to cancel writing a dump.
  // filter_context: Context for the filter callback.
  // dump_callback: Callback for a client crash dump request.
  // dump_context: Context for client crash dump request callback.
  // exit_callback: Callback for client process exit.
  // exit_context: Context for client exit callback.
  // generate_dumps: Whether to automatically generate dumps.
  //     Client code of this class might want to generate dumps explicitly
  //     in the crash dump request callback. In that case, false can be
  //     passed for this parameter.
  // dump_path: Path for generating dumps; required only if true is
  //     passed for generateDumps parameter; NULL can be passed otherwise.
  CrashGenerationServer(const char *mach_port_name,
                        FilterCallback filter,
                        void *filter_context,
                        OnClientDumpRequestCallback dump_callback,
                        void *dump_context,
                        OnClientExitingCallback exit_callback,
                        void *exit_context,
                        bool generate_dumps,
                        const std::string &dump_path);

  ~CrashGenerationServer();

  // Perform initialization steps needed to start listening to clients.
  //
  // Return true if initialization is successful; false otherwise.
  bool Start();

  // Stop the server.
  bool Stop();

 private:
  // Return a unique filename at which a minidump can be written.
  bool MakeMinidumpFilename(std::string &outFilename);

  // Loop reading client messages and responding to them until
  // a quit message is received.
  static void *WaitForMessages(void *server);

  // Wait for a single client message and respond to it. Returns false
  // if a quit message was received or if an error occurred.
  bool WaitForOneMessage();

  FilterCallback filter_;
  void *filter_context_;

  OnClientDumpRequestCallback dump_callback_;
  void *dump_context_;

  OnClientExitingCallback exit_callback_;
  void *exit_context_;

  bool generate_dumps_;

  std::string dump_dir_;

  bool started_;

  // The mach port that receives requests to dump from child processes.
  ReceivePort receive_port_;

  // The name of the mach port. Stored so the Stop method can message
  // the background thread to shut it down.
  std::string mach_port_name_;

  // The thread that waits on the receive port.
  pthread_t server_thread_;

  // Disable copy constructor and operator=.
  CrashGenerationServer(const CrashGenerationServer&);
  CrashGenerationServer& operator=(const CrashGenerationServer&);
};

}  // namespace google_breakpad

#endif  // GOOGLE_BREAKPAD_CLIENT_MAC_CRASH_GENERATION_CRASH_GENERATION_SERVER_H_