blob: 79609cd0f9ffa2d79097dce106f3c52bf9445ece [file] [log] [blame]
// Copyright 2016 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <sys/types.h>
#include <memory>
#include <string>
#include <vector>
#include <base/files/scoped_file.h>
#include <base/macros.h>
#include <google/protobuf/message_lite.h>
#include "patchpanel/message_dispatcher.h"
namespace patchpanel {
// Tracks a helper subprocess. Handles forking, cleaning up on termination,
// and IPC.
// This object is used by the main Manager process.
class HelperProcess {
HelperProcess() = default;
virtual ~HelperProcess() = default;
// Re-execs patchpanel with a new argument: "|fd_arg|=N", where N is the
// side of |control_fd|. This tells the subprocess to start up a different
// mainloop.
void Start(int argc, char* argv[], const std::string& fd_arg);
// Attempts to restart the process with the original arguments.
// Returns false if the maximum number of restarts has been exceeded.
bool Restart();
// Serializes a protobuf and sends it to the helper process.
void SendMessage(const google::protobuf::MessageLite& proto) const;
// Start listening on messages from subprocess and dispatching them to
// handlers. This function can only be called after that the message loop of
// main process is initialized.
void Listen();
void RegisterDeviceMessageHandler(
const base::Callback<void(const DeviceMessage&)>& handler);
pid_t pid() const { return pid_; }
uint8_t restarts() const { return restarts_; }
void Launch();
pid_t pid_{0};
uint8_t restarts_{0};
std::vector<std::string> argv_;
std::string fd_arg_;
std::unique_ptr<MessageDispatcher> msg_dispatcher_;
} // namespace patchpanel