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