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base / process / port_provider_mac.h [blame]
// Copyright 2015 The Chromium Authors
// 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/memory/scoped_refptr.h"
#include "base/observer_list_threadsafe.h"
#include "base/process/process_handle.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();
PortProvider(const PortProvider&) = delete;
PortProvider& operator=(const PortProvider&) = delete;
virtual ~PortProvider();
class Observer {
public:
virtual ~Observer() = default;
// Called by the PortProvider to notify observers that the task port was
// received for a given process.
// This notification is guaranteed to be sent on the same task runner where
// the observer was added.
virtual void OnReceivedTaskPort(ProcessHandle process_handle) = 0;
};
// Returns the mach task port for `process_handle` if possible, or else
// `MACH_PORT_NULL`.
virtual mach_port_t TaskForHandle(ProcessHandle process_handle) 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_handle);
private:
scoped_refptr<base::ObserverListThreadSafe<Observer>> observer_list_;
};
// Port provider that returns the calling process's task port, ignoring its
// argument.
class BASE_EXPORT SelfPortProvider : public base::PortProvider {
mach_port_t TaskForHandle(base::ProcessHandle process_handle) const override;
};
} // namespace base
#endif // BASE_PROCESS_PORT_PROVIDER_MAC_H_