64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
// Copyright 2015 The Chromium Authors
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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/memory/scoped_refptr.h"
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#include "base/observer_list_threadsafe.h"
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#include "base/process/process_handle.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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PortProvider(const PortProvider&) = delete;
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PortProvider& operator=(const PortProvider&) = delete;
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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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// This notification is guaranteed to be sent on the same task runner where
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// the observer was added.
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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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scoped_refptr<base::ObserverListThreadSafe<Observer>> observer_list_;
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};
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// Port provider that returns the calling process's task port, ignoring its
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// argument.
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class BASE_EXPORT SelfPortProvider : public base::PortProvider {
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mach_port_t TaskForPid(base::ProcessHandle process) const override;
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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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