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// 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 CONTENT_PUBLIC_BROWSER_UTILITY_PROCESS_HOST_H_
#define CONTENT_PUBLIC_BROWSER_UTILITY_PROCESS_HOST_H_
#include "base/environment.h"
#include "base/process/launch.h"
#include "base/threading/thread.h"
#include "build/build_config.h"
#include "content/common/content_export.h"
#include "ipc/ipc_sender.h"
namespace base {
class FilePath;
class SequencedTaskRunner;
}
namespace content {
class ServiceRegistry;
class UtilityProcessHostClient;
struct ChildProcessData;
// This class acts as the browser-side host to a utility child process. A
// utility process is a short-lived process that is created to run a specific
// task. This class lives solely on the IO thread.
// If you need a single method call in the process, use StartFooBar(p).
// If you need multiple batches of work to be done in the process, use
// StartBatchMode(), then multiple calls to StartFooBar(p), then finish with
// EndBatchMode().
// If you need to call Mojo services, use StartMojoMode() to start the child
// process and GetServiceRegistry() to get the service registry to connect to
// the child's Mojo services.
//
// Note: If your class keeps a ptr to an object of this type, grab a weak ptr to
// avoid a use after free since this object is deleted synchronously but the
// client notification is asynchronous. See http://crbug.com/108871.
class UtilityProcessHost : public IPC::Sender {
public:
// Used to create a utility process. |client| is optional. If supplied it will
// be notified of incoming messages from the utility process.
// |client_task_runner| is required if |client| is supplied and is the task
// runner upon which |client| will be invoked.
CONTENT_EXPORT static UtilityProcessHost* Create(
const scoped_refptr<UtilityProcessHostClient>& client,
const scoped_refptr<base::SequencedTaskRunner>& client_task_runner);
~UtilityProcessHost() override {}
virtual base::WeakPtr<UtilityProcessHost> AsWeakPtr() = 0;
// Starts utility process in batch mode. Caller must call EndBatchMode()
// to finish the utility process.
virtual bool StartBatchMode() = 0;
// Ends the utility process. Must be called after StartBatchMode().
virtual void EndBatchMode() = 0;
// Allows a directory to be opened through the sandbox, in case it's needed by
// the operation.
virtual void SetExposedDir(const base::FilePath& dir) = 0;
// Make the process run without a sandbox.
virtual void DisableSandbox() = 0;
#if defined(OS_WIN)
// Make the process run elevated.
virtual void ElevatePrivileges() = 0;
#endif
// Returns information about the utility child process.
virtual const ChildProcessData& GetData() = 0;
#if defined(OS_POSIX)
virtual void SetEnv(const base::EnvironmentMap& env) = 0;
#endif
// Starts the utility process in Mojo mode.
virtual bool StartMojoMode() = 0;
// Returns the ServiceRegistry for this process. Will return nullptr if
// the process was not started with StartMojoMode().
virtual ServiceRegistry* GetServiceRegistry() = 0;
// Set the name of the process to appear in the task manager.
virtual void SetName(const base::string16& name) = 0;
};
}; // namespace content
#endif // CONTENT_PUBLIC_BROWSER_UTILITY_PROCESS_HOST_H_
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