1666bf2e52
BUG=none TEST=none Review URL: https://chromiumcodereview.appspot.com/10824036 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@148698 0039d316-1c4b-4281-b951-d872f2087c98
98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
// Copyright (c) 2012 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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// UdevLinux listens for device change notifications from udev and runs
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// callbacks when notifications occur.
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//
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// UdevLinux must be created on a MessageLoop of TYPE_IO.
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// UdevLinux is not thread-safe.
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//
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// Example usage:
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//
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// class UdevLinux;
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//
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// class Foo {
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// public:
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// Foo() {
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// std::vector<UdevLinux::UdevMonitorFilter> filters;
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// filters.push_back(content::UdevLinux::UdevMonitorFilter("block", NULL));
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// udev_.reset(new UdevLinux(filters,
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// base::Bind(&Foo::Notify, this)));
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// }
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//
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// // Called when a "block" device attaches/detaches.
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// // To hold on to |device|, call udev_device_ref(device).
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// void Notify(udev_device* device) {
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// // Do something with |device|.
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// }
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//
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// private:
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// scoped_ptr<UdevLinux> udev_;
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//
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// DISALLOW_COPY_AND_ASSIGN(Foo);
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// };
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#ifndef CONTENT_BROWSER_UDEV_LINUX_H_
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#define CONTENT_BROWSER_UDEV_LINUX_H_
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#include <vector>
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#include "base/basictypes.h"
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#include "base/callback.h"
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#include "base/compiler_specific.h"
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#include "base/message_pump_libevent.h"
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extern "C" {
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struct udev;
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struct udev_device;
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struct udev_monitor;
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}
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namespace content {
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class UdevLinux : public base::MessagePumpLibevent::Watcher {
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public:
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typedef base::Callback<void(udev_device*)> UdevNotificationCallback;
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// subsystem and devtype parameter for
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// udev_monitor_filter_add_match_subsystem_devtype().
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struct UdevMonitorFilter {
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UdevMonitorFilter(const char* subsystem_in, const char* devtype_in)
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: subsystem(subsystem_in),
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devtype(devtype_in) {
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}
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const char* subsystem;
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const char* devtype;
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};
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// Filter incoming devices based on |filters|.
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// Calls |callback| upon device change events.
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UdevLinux(const std::vector<UdevMonitorFilter>& filters,
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const UdevNotificationCallback& callback);
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virtual ~UdevLinux();
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// Returns the udev handle to be passed into other udev_*() functions.
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udev* udev_handle();
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private:
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// base::MessagePump:Libevent::Watcher implementation.
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virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
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virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
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// libudev-related items, the main context, and the monitoring context to be
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// notified about changes to device states.
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udev* udev_;
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udev_monitor* monitor_;
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int monitor_fd_;
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base::MessagePumpLibevent::FileDescriptorWatcher monitor_watcher_;
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UdevNotificationCallback callback_;
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DISALLOW_COPY_AND_ASSIGN(UdevLinux);
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};
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} // namespace content
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#endif // CONTENT_BROWSER_UDEV_LINUX_H_
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