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// Copyright 2015 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 BASE_PROCESS_PORT_PROVIDER_MAC_H_
#define BASE_PROCESS_PORT_PROVIDER_MAC_H_
#include <mach/mach.h>
#include "base/base_export.h"
#include "base/macros.h"
#include "base/observer_list.h"
#include "base/process/process_handle.h"
#include "base/synchronization/lock.h"
namespace base {
// Abstract base class that provides a mapping from ProcessHandle (pid_t) to the
// Mach task port. This replicates task_for_pid(), which requires root
// privileges.
class BASE_EXPORT PortProvider {
public:
PortProvider();
virtual ~PortProvider();
class Observer {
public:
virtual ~Observer() {};
// Called by the PortProvider to notify observers that the task port was
// received for a given process.
// No guarantees are made about the thread on which this notification will
// be sent.
// Observers must not call AddObserver() or RemoveObserver() in this
// callback, as doing so will deadlock.
virtual void OnReceivedTaskPort(ProcessHandle process) = 0;
};
// Returns the mach task port for |process| if possible, or else
// |MACH_PORT_NULL|.
virtual mach_port_t TaskForPid(ProcessHandle process) const = 0;
// Observer interface.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
protected:
// Called by subclasses to send a notification to observers.
void NotifyObservers(ProcessHandle process);
private:
// ObserverList is not thread-safe, so |lock_| ensures consistency of
// |observer_list_|.
base::Lock lock_;
base::ObserverList<Observer> observer_list_;
DISALLOW_COPY_AND_ASSIGN(PortProvider);
};
} // namespace base
#endif // BASE_PROCESS_PORT_PROVIDER_MAC_H_
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