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