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from __future__ import print_function
import sys
import os
import fnmatch
from ctypes import *
# XXX this one may need some tweaking...
def find_library(name, somajor=0):
env = os.environ.get("LD_LIBRARY_PATH")
common = ["/lib64", "/lib"]
if env:
libdirs = env.split(":") + common
else:
libdirs = common
libdirs = filter(os.path.isdir, libdirs)
for dir in libdirs:
files = fnmatch.filter(os.listdir(dir), "lib%s.so.%d" % (name, somajor))
files = [os.path.join(dir, file) for file in files]
if files:
break
if files:
return files[0]
else:
return None
# find the udev library
libudev = find_library(name="udev", somajor=0)
if not libudev or not os.path.exists(libudev):
raise ImportError, "No library named %s" % libudev
# load the udev library
libudev = CDLL(libudev)
# create aliases for needed functions and set the return types where needed
libudev_udev_new = libudev.udev_new
libudev_udev_new.argtypes = []
libudev_udev_new.restype = c_void_p
libudev_udev_unref = libudev.udev_unref
libudev_udev_unref.argtypes = [ c_void_p ]
libudev_udev_device_new_from_syspath = libudev.udev_device_new_from_syspath
libudev_udev_device_new_from_syspath.restype = c_void_p
libudev_udev_device_new_from_syspath.argtypes = [ c_void_p, c_char_p ]
libudev_udev_device_unref = libudev.udev_device_unref
libudev_udev_device_unref.argtypes = [ c_void_p ]
libudev_udev_device_get_syspath = libudev.udev_device_get_syspath
libudev_udev_device_get_syspath.restype = c_char_p
libudev_udev_device_get_syspath.argtypes = [ c_void_p ]
libudev_udev_device_get_sysname = libudev.udev_device_get_sysname
libudev_udev_device_get_sysname.restype = c_char_p
libudev_udev_device_get_sysname.argtypes = [ c_void_p ]
libudev_udev_device_get_devpath = libudev.udev_device_get_devpath
libudev_udev_device_get_devpath.restype = c_char_p
libudev_udev_device_get_devpath.argtypes = [ c_void_p ]
libudev_udev_device_get_devtype = libudev.udev_device_get_devtype
libudev_udev_device_get_devtype.restype = c_char_p
libudev_udev_device_get_devtype.argtypes = [ c_void_p ]
libudev_udev_device_get_devnode = libudev.udev_device_get_devnode
libudev_udev_device_get_devnode.restype = c_char_p
libudev_udev_device_get_devnode.argtypes = [ c_void_p ]
libudev_udev_device_get_subsystem = libudev.udev_device_get_subsystem
libudev_udev_device_get_subsystem.restype = c_char_p
libudev_udev_device_get_subsystem.argtypes = [ c_void_p ]
libudev_udev_device_get_sysnum = libudev.udev_device_get_sysnum
libudev_udev_device_get_sysnum.restype = c_char_p
libudev_udev_device_get_sysnum.argtypes = [ c_void_p ]
libudev_udev_device_get_properties_list_entry = libudev.udev_device_get_properties_list_entry
libudev_udev_device_get_properties_list_entry.restype = c_void_p
libudev_udev_device_get_properties_list_entry.argtypes = [ c_void_p ]
libudev_udev_list_entry_get_next = libudev.udev_list_entry_get_next
libudev_udev_list_entry_get_next.restype = c_void_p
libudev_udev_list_entry_get_next.argtypes = [ c_void_p ]
libudev_udev_list_entry_get_name = libudev.udev_list_entry_get_name
libudev_udev_list_entry_get_name.restype = c_char_p
libudev_udev_list_entry_get_name.argtypes = [ c_void_p ]
libudev_udev_list_entry_get_value = libudev.udev_list_entry_get_value
libudev_udev_list_entry_get_value.restype = c_char_p
libudev_udev_list_entry_get_value.argtypes = [ c_void_p ]
libudev_udev_enumerate_new = libudev.udev_enumerate_new
libudev_udev_enumerate_new.restype = c_void_p
libudev_udev_enumerate_new.argtypes = [ c_void_p ]
libudev_udev_enumerate_unref = libudev.udev_enumerate_unref
libudev_udev_enumerate_unref.argtypes = [ c_void_p ]
libudev_udev_enumerate_add_match_subsystem = libudev.udev_enumerate_add_match_subsystem
libudev_udev_enumerate_add_match_subsystem.restype = c_int
libudev_udev_enumerate_add_match_subsystem.argtypes = [ c_void_p, c_char_p ]
libudev_udev_enumerate_scan_devices = libudev.udev_enumerate_scan_devices
libudev_udev_enumerate_scan_devices.restype = c_int
libudev_udev_enumerate_scan_devices.argtypes = [ c_void_p ]
libudev_udev_enumerate_get_list_entry = libudev.udev_enumerate_get_list_entry
libudev_udev_enumerate_get_list_entry.restype = c_void_p
libudev_udev_enumerate_get_list_entry.argtypes = [ c_void_p ]
libudev_udev_device_get_devlinks_list_entry = libudev.udev_device_get_devlinks_list_entry
libudev_udev_device_get_devlinks_list_entry.restype = c_void_p
libudev_udev_device_get_devlinks_list_entry.argtypes = [ c_void_p ]
class UdevDevice(dict):
def __init__(self, udev, sysfs_path):
dict.__init__(self)
# create new udev device from syspath
udev_device = libudev_udev_device_new_from_syspath(udev, sysfs_path)
if not udev_device:
# device does not exist
return
# set syspath and sysname properties
self.syspath = libudev_udev_device_get_syspath(udev_device)
self.sysname = libudev_udev_device_get_sysname(udev_device)
# get the devlinks list
devlinks = []
devlinks_entry = libudev_udev_device_get_devlinks_list_entry(udev_device)
while devlinks_entry:
path = libudev_udev_list_entry_get_name(devlinks_entry)
devlinks.append(path)
devlinks_entry = libudev_udev_list_entry_get_next(devlinks_entry)
# add devlinks list to the dictionary
self["symlinks"] = devlinks
# get the first property entry
property_entry = libudev_udev_device_get_properties_list_entry(udev_device)
while property_entry:
name = libudev_udev_list_entry_get_name(property_entry)
value = libudev_udev_list_entry_get_value(property_entry)
# XXX some of the strings contain a list of values in them,
# we want to split them and make a list
if value.count(" %s=" % name):
value = value.split(" %s=" % name)
self[name] = value
# get next property entry
property_entry = libudev_udev_list_entry_get_next(property_entry)
# set additional properties
self.devpath = libudev_udev_device_get_devpath(udev_device)
self.subsystem = libudev_udev_device_get_subsystem(udev_device)
self.devtype = libudev_udev_device_get_devtype(udev_device)
self.sysnum = libudev_udev_device_get_sysnum(udev_device)
self.devnode = libudev_udev_device_get_devnode(udev_device)
# cleanup
libudev_udev_device_unref(udev_device)
class Udev(object):
def __init__(self):
self.udev = libudev_udev_new()
def create_device(self, sysfs_path):
return UdevDevice(self.udev, sysfs_path)
def enumerate_devices(self, subsystem=None):
enumerate = libudev_udev_enumerate_new(self.udev)
# add the match subsystem
if subsystem is not None:
rc = libudev_udev_enumerate_add_match_subsystem(enumerate, subsystem)
if not rc == 0:
print("error: unable to add the match subsystem", file=sys.stderr)
libudev_udev_enumerate_unref(enumerate)
return []
# scan the devices
rc = libudev_udev_enumerate_scan_devices(enumerate)
if not rc == 0:
print("error: unable to enumerate the devices", file=sys.stderr)
libudev_udev_enumerate_unref(enumerate)
return []
# create the list of sysfs paths
sysfs_paths = []
# get the first list entry
list_entry = libudev_udev_enumerate_get_list_entry(enumerate)
while list_entry:
sysfs_path = libudev_udev_list_entry_get_name(list_entry)
sysfs_paths.append(sysfs_path)
# get next list entry
list_entry = libudev_udev_list_entry_get_next(list_entry)
# cleanup
libudev_udev_enumerate_unref(enumerate)
return sysfs_paths
def scan_devices(self, sysfs_paths=None):
if sysfs_paths is None:
sysfs_paths = self.enumerate_devices()
for sysfs_path in sysfs_paths:
device = self.create_device(sysfs_path)
if device:
yield device
def unref(self):
libudev_udev_unref(self.udev)
self.udev = None
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