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// Copyright 2014 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.
#ifndef DEVICE_UDEV_LINUX_SCOPED_UDEV_H_
#define DEVICE_UDEV_LINUX_SCOPED_UDEV_H_
#include <libudev.h>
#include "base/memory/scoped_ptr.h"
#if !defined(USE_UDEV)
#error "USE_UDEV not defined"
#endif
#include <dlfcn.h>
namespace device {
class LibUdevWrapper {
public:
LibUdevWrapper() : m_libUdev(0), m_loaded(false)
{
load();
}
virtual ~LibUdevWrapper()
{
if (m_libUdev)
dlclose(m_libUdev);
}
private:
void* m_libUdev;
bool m_loaded;
void load()
{
m_libUdev = dlopen("libudev.so.1", RTLD_NOW);
m_loaded = m_libUdev;
if (resolveMethods())
return;
if (!m_libUdev)
m_libUdev = dlopen("libudev.so.0", RTLD_NOW);
m_loaded = m_libUdev;
resolveMethods();
}
void* resolve(const char* name)
{
void* ptr = dlsym(m_libUdev, name);
if (!ptr) {
m_loaded = false;
}
return ptr;
}
bool resolveMethods()
{
if (!m_loaded)
return false;
udev_new = (udev* (*)())resolve("udev_new");
udev_unref = (void (*)(udev*))resolve("udev_unref");
udev_monitor_new_from_netlink = (udev_monitor* (*)(udev*, const char*))resolve("udev_monitor_new_from_netlink");
udev_monitor_unref = (void (*)(udev_monitor*))resolve("udev_monitor_unref");
udev_monitor_enable_receiving = (int (*)(udev_monitor*))resolve("udev_monitor_enable_receiving");
udev_monitor_get_fd = (int (*)(udev_monitor*))resolve("udev_monitor_get_fd");
udev_monitor_filter_add_match_subsystem_devtype = (int (*)(udev_monitor*, const char*, const char*))resolve("udev_monitor_filter_add_match_subsystem_devtype");
udev_monitor_receive_device = (udev_device* (*)(udev_monitor*))resolve("udev_monitor_receive_device");
udev_enumerate_new = (udev_enumerate* (*)(udev*))resolve("udev_enumerate_new");
udev_enumerate_unref = (void (*)(udev_enumerate*))resolve("udev_enumerate_unref");
udev_enumerate_add_match_subsystem = (int (*)(udev_enumerate*, const char*))resolve("udev_enumerate_add_match_subsystem");
udev_enumerate_add_match_property = (int (*)(udev_enumerate*, const char*, const char*))resolve("udev_enumerate_add_match_property");
udev_enumerate_scan_devices = (int (*)(udev_enumerate*))resolve("udev_enumerate_scan_devices");
udev_enumerate_get_list_entry = (udev_list_entry* (*)(udev_enumerate*))resolve("udev_enumerate_get_list_entry");
udev_list_entry_get_next = (udev_list_entry* (*)(udev_list_entry*))resolve("udev_list_entry_get_next");
udev_list_entry_get_name = (const char* (*)(udev_list_entry*))resolve("udev_list_entry_get_name");
udev_device_new_from_syspath = (udev_device* (*)(udev*, const char*))resolve("udev_device_new_from_syspath");
udev_device_unref = (void (*)(udev_device*))resolve("udev_device_unref");
udev_device_get_syspath = (const char* (*)(udev_device*))resolve("udev_device_get_syspath");
udev_device_get_devnode = (const char* (*)(udev_device*))resolve("udev_device_get_devnode");
udev_device_get_property_value = (const char* (*)(udev_device*, const char*))resolve("udev_device_get_property_value");
udev_device_get_action = (const char* (*)(udev_device*))resolve("udev_device_get_action");
udev_device_get_subsystem = (const char* (*)(udev_device*))resolve("udev_device_get_subsystem");
udev_device_get_sysattr_value = (const char* (*)(udev_device*, const char*))resolve("udev_device_get_sysattr_value");
udev_device_get_parent_with_subsystem_devtype =
(struct udev_device* (*)(struct udev_device*, const char*, const char*))resolve("udev_device_get_parent_with_subsystem_devtype");
return m_loaded;
}
public:
struct udev* (*udev_new)();
void (*udev_unref)(struct udev*);
struct udev_monitor* (*udev_monitor_new_from_netlink)(struct udev*, const char *name);
void (*udev_monitor_unref)(struct udev_monitor*);
int (*udev_monitor_enable_receiving)(struct udev_monitor*);
int (*udev_monitor_get_fd)(struct udev_monitor*);
int (*udev_monitor_filter_add_match_subsystem_devtype)(struct udev_monitor*, const char *subsystem, const char *devtype);
struct udev_device* (*udev_monitor_receive_device)(struct udev_monitor*);
struct udev_enumerate* (*udev_enumerate_new)(struct udev*);
void (*udev_enumerate_unref)(struct udev_enumerate*);
int (*udev_enumerate_add_match_subsystem)(struct udev_enumerate*, const char *subsystem);
int (*udev_enumerate_add_match_property)(struct udev_enumerate*, const char *property, const char *value);
int (*udev_enumerate_scan_devices)(struct udev_enumerate*);
struct udev_list_entry* (*udev_enumerate_get_list_entry)(struct udev_enumerate*);
struct udev_list_entry* (*udev_list_entry_get_next)(struct udev_list_entry*);
const char* (*udev_list_entry_get_name)(struct udev_list_entry*);
struct udev_device* (*udev_device_new_from_syspath)(struct udev *udev, const char *syspath);
void (*udev_device_unref)(struct udev_device *udev_device);
const char* (*udev_device_get_syspath)(struct udev_device *udev_device);
const char* (*udev_device_get_devnode)(struct udev_device *udev_device);
const char* (*udev_device_get_property_value)(struct udev_device *udev_device, const char *key);
const char* (*udev_device_get_action)(struct udev_device *udev_device);
const char* (*udev_device_get_subsystem)(struct udev_device *udev_device);
const char* (*udev_device_get_sysattr_value)(struct udev_device *udev_device, const char *sysattr);
struct udev_device* (*udev_device_get_parent_with_subsystem_devtype)(struct udev_device *udev_device,
const char *subsystem, const char *devtype);
};
} // namespace device
extern device::LibUdevWrapper libudev;
namespace device {
struct UdevDeleter {
void operator()(udev* dev) const {
libudev.udev_unref(dev);
}
};
struct UdevEnumerateDeleter {
void operator()(udev_enumerate* enumerate) const {
libudev.udev_enumerate_unref(enumerate);
}
};
struct UdevDeviceDeleter {
void operator()(udev_device* device) const {
libudev.udev_device_unref(device);
}
};
struct UdevMonitorDeleter {
void operator()(udev_monitor* monitor) const {
libudev.udev_monitor_unref(monitor);
}
};
typedef scoped_ptr<udev, UdevDeleter> ScopedUdevPtr;
typedef scoped_ptr<udev_enumerate, UdevEnumerateDeleter> ScopedUdevEnumeratePtr;
typedef scoped_ptr<udev_device, UdevDeviceDeleter> ScopedUdevDevicePtr;
typedef scoped_ptr<udev_monitor, UdevMonitorDeleter> ScopedUdevMonitorPtr;
}
#endif // DEVICE_UDEV_LINUX_SCOPED_UDEV_H_
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