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// Copyright (c) 2012 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.
#include "content/browser/udev_linux.h"
#include <libudev.h>
#include "base/message_loop/message_loop.h"
namespace content {
UdevLinux::UdevLinux(const std::vector<UdevMonitorFilter>& filters,
const UdevNotificationCallback& callback)
: udev_(udev_new()),
monitor_(NULL),
monitor_fd_(-1),
callback_(callback) {
CHECK(udev_);
monitor_ = udev_monitor_new_from_netlink(udev_, "udev");
CHECK(monitor_);
for (size_t i = 0; i < filters.size(); ++i) {
int ret = udev_monitor_filter_add_match_subsystem_devtype(
monitor_, filters[i].subsystem, filters[i].devtype);
CHECK_EQ(0, ret);
}
int ret = udev_monitor_enable_receiving(monitor_);
CHECK_EQ(0, ret);
monitor_fd_ = udev_monitor_get_fd(monitor_);
CHECK_GE(monitor_fd_, 0);
bool success = base::MessageLoopForIO::current()->WatchFileDescriptor(
monitor_fd_,
true,
base::MessageLoopForIO::WATCH_READ,
&monitor_watcher_,
this);
CHECK(success);
}
UdevLinux::~UdevLinux() {
monitor_watcher_.StopWatchingFileDescriptor();
udev_monitor_unref(monitor_);
udev_unref(udev_);
}
udev* UdevLinux::udev_handle() {
return udev_;
}
void UdevLinux::OnFileCanReadWithoutBlocking(int fd) {
// Events occur when devices attached to the system are added, removed, or
// change state. udev_monitor_receive_device() will return a device object
// representing the device which changed and what type of change occured.
DCHECK_EQ(monitor_fd_, fd);
udev_device* dev = udev_monitor_receive_device(monitor_);
if (!dev)
return;
callback_.Run(dev);
udev_device_unref(dev);
}
void UdevLinux::OnFileCanWriteWithoutBlocking(int fd) {
}
} // namespace content
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