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/*
SPDX-FileCopyrightText: 2009 Benjamin K. Stuhl <bks24@cornell.edu>
SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
*/
#include "udevqtclient.h"
#include "udevqt_p.h"
#include <powerdevil_debug.h>
#include <QSocketNotifier>
#include <qplatformdefs.h>
namespace UdevQt
{
ClientPrivate::ClientPrivate(Client *q_)
: udev(nullptr)
, monitor(nullptr)
, q(q_)
, monitorNotifier(nullptr)
{
}
ClientPrivate::~ClientPrivate()
{
udev_unref(udev);
delete monitorNotifier;
if (monitor)
udev_monitor_unref(monitor);
}
void ClientPrivate::init(const QStringList &subsystemList, ListenToWhat what)
{
udev = udev_new();
if (what != ListenToNone) {
setWatchedSubsystems(subsystemList);
}
}
void ClientPrivate::setWatchedSubsystems(const QStringList &subsystemList)
{
// create a listener
struct udev_monitor *newM = udev_monitor_new_from_netlink(udev, "udev");
if (!newM) {
qCWarning(POWERDEVIL, "UdevQt: unable to create udev monitor connection");
return;
}
// apply our filters; an empty list means listen to everything
for (const QString &subsysDevtype : subsystemList) {
int ix = subsysDevtype.indexOf(u'/');
if (ix > 0) {
QByteArray subsystem = QStringView(subsysDevtype).left(ix).toLatin1();
QByteArray devType = QStringView(subsysDevtype).mid(ix + 1).toLatin1();
udev_monitor_filter_add_match_subsystem_devtype(newM, subsystem.constData(), devType.constData());
} else {
udev_monitor_filter_add_match_subsystem_devtype(newM, subsysDevtype.toLatin1().constData(), nullptr);
}
}
// start the new monitor receiving
udev_monitor_enable_receiving(newM);
QSocketNotifier *sn = new QSocketNotifier(udev_monitor_get_fd(newM), QSocketNotifier::Read);
QObject::connect(sn, SIGNAL(activated(int)), q, SLOT(_uq_monitorReadyRead(int)));
// kill any previous monitor
delete monitorNotifier;
if (monitor)
udev_monitor_unref(monitor);
// and save our new one
monitor = newM;
monitorNotifier = sn;
watchedSubsystems = subsystemList;
}
void ClientPrivate::_uq_monitorReadyRead(int fd)
{
Q_UNUSED(fd);
monitorNotifier->setEnabled(false);
struct udev_device *dev = udev_monitor_receive_device(monitor);
monitorNotifier->setEnabled(true);
if (!dev)
return;
Device device(new DevicePrivate(dev, false));
QByteArray action(udev_device_get_action(dev));
if (action == "add") {
Q_EMIT q->deviceAdded(device);
} else if (action == "remove") {
Q_EMIT q->deviceRemoved(device);
} else if (action == "change") {
Q_EMIT q->deviceChanged(device);
} else if (action == "online") {
Q_EMIT q->deviceOnlined(device);
} else if (action == "offline") {
Q_EMIT q->deviceOfflined(device);
} else {
qCWarning(POWERDEVIL, "UdevQt: unhandled device action \"%s\"", action.constData());
}
}
DeviceList ClientPrivate::deviceListFromEnumerate(struct udev_enumerate *en)
{
DeviceList ret;
struct udev_list_entry *list, *entry;
udev_enumerate_scan_devices(en);
list = udev_enumerate_get_list_entry(en);
udev_list_entry_foreach(entry, list)
{
struct udev_device *ud = udev_device_new_from_syspath(udev_enumerate_get_udev(en), udev_list_entry_get_name(entry));
if (!ud)
continue;
ret << Device(new DevicePrivate(ud, false));
}
udev_enumerate_unref(en);
return ret;
}
Client::Client(QObject *parent)
: QObject(parent)
, d(new ClientPrivate(this))
{
d->init(QStringList(), ClientPrivate::ListenToNone);
}
Client::Client(const QStringList &subsystemList, QObject *parent)
: QObject(parent)
, d(new ClientPrivate(this))
{
d->init(subsystemList, ClientPrivate::ListenToList);
}
Client::~Client()
{
delete d;
}
QStringList Client::watchedSubsystems() const
{
// we're watching a specific list
if (!d->watchedSubsystems.isEmpty())
return d->watchedSubsystems;
// we're not watching anything
if (!d->monitor)
return QStringList();
// we're watching everything: figure out what "everything" currently is
// we don't cache it, since it may be subject to change, depending on hotplug
struct udev_enumerate *en = udev_enumerate_new(d->udev);
udev_enumerate_scan_subsystems(en);
QStringList s = listFromListEntry(udev_enumerate_get_list_entry(en));
udev_enumerate_unref(en);
return s;
}
void Client::setWatchedSubsystems(const QStringList &subsystemList)
{
d->setWatchedSubsystems(subsystemList);
}
DeviceList Client::devicesByProperty(const QString &property, const QVariant &value)
{
struct udev_enumerate *en = udev_enumerate_new(d->udev);
if (value.isValid()) {
udev_enumerate_add_match_property(en, property.toLatin1().constData(), value.toString().toLatin1().constData());
} else {
udev_enumerate_add_match_property(en, property.toLatin1().constData(), nullptr);
}
return d->deviceListFromEnumerate(en);
}
DeviceList Client::allDevices()
{
struct udev_enumerate *en = udev_enumerate_new(d->udev);
return d->deviceListFromEnumerate(en);
}
DeviceList Client::devicesBySubsystem(const QString &subsystem)
{
struct udev_enumerate *en = udev_enumerate_new(d->udev);
udev_enumerate_add_match_subsystem(en, subsystem.toLatin1().constData());
return d->deviceListFromEnumerate(en);
}
Device Client::deviceByDeviceFile(const QString &deviceFile)
{
QT_STATBUF sb;
if (QT_STAT(deviceFile.toLatin1().constData(), &sb) != 0)
return Device();
struct udev_device *ud = nullptr;
if (S_ISBLK(sb.st_mode))
ud = udev_device_new_from_devnum(d->udev, 'b', sb.st_rdev);
else if (S_ISCHR(sb.st_mode))
ud = udev_device_new_from_devnum(d->udev, 'c', sb.st_rdev);
if (!ud)
return Device();
return Device(new DevicePrivate(ud, false));
}
Device Client::deviceBySysfsPath(const QString &sysfsPath)
{
struct udev_device *ud = udev_device_new_from_syspath(d->udev, sysfsPath.toLatin1().constData());
if (!ud)
return Device();
return Device(new DevicePrivate(ud, false));
}
Device Client::deviceBySubsystemAndName(const QString &subsystem, const QString &name)
{
struct udev_device *ud = udev_device_new_from_subsystem_sysname(d->udev, subsystem.toLatin1().constData(), name.toLatin1().constData());
if (!ud)
return Device();
return Device(new DevicePrivate(ud, false));
}
}
#include "moc_udevqtclient.cpp"
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