/usr/lib/python3/dist-packages/evemu/base.py is in python3-evemu 2.1.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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The base module provides classes wrapping shared libraries.
"""
import ctypes
import ctypes.util
import os
# Import types directly, so they don't have to be prefixed with "ctypes.".
from ctypes import c_char_p, c_int, c_uint, c_void_p, c_long, c_int32, c_uint16
import evemu.exception
def raise_error_if(raise_error, result, func, args):
"""
Raise an ExecutionError for an unexpected result (raise_error == True).
The exception message includes the API call (name) plus arguments, the
unexpected result and, if errno is not zero, text describing the
error number.
"""
def get_call_str():
""" Returns a str 'function_name(argument_values...)'. """
strargs = []
for (num, arg) in enumerate(func.argtypes):
# convert args to str for readable output
if arg == c_char_p:
strargs.append('"%s"' % args[num].decode("iso8859-1"))
elif arg == c_void_p:
strargs.append(hex(int(args[num])))
else:
strargs.append(str(args[num]))
return "%s(%s)" % (func.__name__, ", ".join(strargs))
def get_retval_str():
""" Returns a str with the unexpected return value. """
return ", Unexpected return value: %s" % result
def get_errno_str():
""" Returns a str describing the error number or an empty string. """
errno = ctypes.get_errno()
if errno != 0:
return ", errno[%d]: %s" % (errno, os.strerror(errno))
else:
return ""
if raise_error:
msg = "%s%s%s" % (get_call_str(), get_retval_str(), get_errno_str())
raise evemu.exception.ExecutionError(msg)
else:
# If the errcheck function returns the argument tuple it receives
# unchanged, ctypes continues the normal processing it does on the
# output parameters.
return args
def expect_eq_zero(result, func, args):
""" Expect 'result' being equal to zero. """
return raise_error_if(result != 0, result, func, args)
def expect_ge_zero(result, func, args):
""" Expect 'result' being greater or equal to zero. """
return raise_error_if(result < 0, result, func, args)
def expect_gt_zero(result, func, args):
""" Expect 'result' being greater then zero. """
return raise_error_if(result <= 0, result, func, args)
def expect_not_none(result, func, args):
""" Expect 'result' being not None. """
return raise_error_if(result is None, result, func, args)
class LibraryWrapper(object):
"""
Base class for wrapping a shared library.
"""
_loaded_lib = None
# Class variable containing the instance returned by CDLL(), which
# represents the shared library.
# Initialized once, shared between all instances of this class.
def __init__(self):
super(LibraryWrapper, self).__init__()
self._load()
# Prototypes for the API calls to wrap. Needs to be overwritten by sub
# classes.
_api_prototypes = {
#"API_CALL_NAME": {
# "argtypes": sequence of ARGUMENT TYPES,
# "restype": RETURN TYPE,
# "errcheck": callback for return value checking, optional
# },
}
@classmethod
def _load(cls):
"""
Returns an instance of the wrapped shared library.
If not already initialized: set argument and return types on API
calls and optionally a callback function for return value checking.
Add the API call as attribute to the class at the end.
"""
if cls._loaded_lib is not None:
# Already initialized, just return it.
return cls._loaded_lib
# Get an instance of the wrapped shared library.
cls._loaded_lib = cls._cdll()
# Iterate the API call prototypes.
for (name, attrs) in cls._api_prototypes.items():
# Get the API call.
api_call = getattr(cls._loaded_lib, name)
# Add argument and return types.
api_call.argtypes = attrs["argtypes"]
api_call.restype = attrs["restype"]
# Optionally, add a callback for return value checking.
if "errcheck" in attrs:
api_call.errcheck = attrs["errcheck"]
# Add the API call as attribute to the class.
setattr(cls, name, api_call)
return cls._loaded_lib
@staticmethod
# @abc.abstractmethod - Would be nice here, but it can't be mixed with
# @staticmethod until Python 3.3.
def _cdll():
""" Returns a new instance of the wrapped shared library. """
raise NotImplementedError
class LibC(LibraryWrapper):
"""
Wrapper for API calls to the C library.
"""
@staticmethod
def _cdll():
return ctypes.CDLL("libc.so.6", use_errno=True)
_api_prototypes = {
"fdopen": {
"argtypes": (c_int, c_char_p),
"restype": c_void_p,
"errcheck": expect_not_none
},
"fflush": {
"argtypes": (c_void_p,),
"restype": c_int,
"errcheck": expect_eq_zero
},
}
class LibEvdev(LibraryWrapper):
"""
Wrapper for API calls to libevdev
"""
@staticmethod
def _cdll():
return ctypes.CDLL("libevdev.so", use_errno=True)
_api_prototypes = {
#const char *libevdev_event_type_get_name(unsigned int type);
"libevdev_event_type_get_name": {
"argtypes": (c_uint,),
"restype": c_char_p
},
#int libevdev_event_type_from_name(const char *name);
"libevdev_event_type_from_name": {
"argtypes": (c_char_p,),
"restype": c_int
},
#const char *libevdev_event_code_get_name(unsigned int type, unsigned int code);
"libevdev_event_code_get_name": {
"argtypes": (c_uint, c_uint,),
"restype": c_char_p
},
#int libevdev_event_code_from_name(unsigned int type, const char *name);
"libevdev_event_code_from_name": {
"argtypes": (c_uint, c_char_p,),
"restype": c_int
},
#const char *libevdev_property_get_name(unsigned int prop);
"libevdev_property_get_name": {
"argtypes": (c_uint,),
"restype": c_char_p
},
#int libevdev_property_from_name(const char *name);
"libevdev_property_from_name": {
"argtypes": (c_char_p,),
"restype": c_int
},
}
class LibEvemu(LibraryWrapper):
"""
Wrapper for API calls to the evemu library.
"""
_LIBNAME = "libevemu.so"
@staticmethod
def _cdll():
return ctypes.CDLL(LibEvemu._LIBNAME, use_errno=True)
_api_prototypes = {
#struct evemu_device *evemu_new(const char *name);
"evemu_new": {
"argtypes": (c_char_p,),
"restype": c_void_p,
"errcheck": expect_not_none
},
#void evemu_delete(struct evemu_device *dev);
"evemu_delete": {
"argtypes": (c_void_p,),
"restype": None
},
#unsigned int evemu_get_version(const struct evemu_device *dev);
"evemu_get_version": {
"argtypes": (c_void_p,),
"restype": c_uint,
},
#const char *evemu_get_name(const struct evemu_device *dev);
"evemu_get_name": {
"argtypes": (c_void_p,),
"restype": c_char_p,
"errcheck": expect_not_none
},
#void evemu_set_name(struct evemu_device *dev, const char *name);
"evemu_set_name": {
"argtypes": (c_void_p, c_char_p),
"restype": None
},
#unsigned int evemu_get_id_bustype(const struct evemu_device *dev);
"evemu_get_id_bustype": {
"argtypes": (c_void_p,),
"restype": c_uint
},
#void evemu_set_id_bustype(struct evemu_device *dev,
# unsigned int bustype);
"evemu_set_id_bustype": {
"argtypes": (c_void_p, c_uint),
"restype": None
},
#unsigned int evemu_get_id_vendor(const struct evemu_device *dev);
"evemu_get_id_vendor": {
"argtypes": (c_void_p,),
"restype": c_uint
},
#void evemu_set_id_vendor(struct evemu_device *dev,
# unsigned int vendor);
"evemu_set_id_vendor": {
"argtypes": (c_void_p, c_uint),
"restype": None
},
#unsigned int evemu_get_id_product(const struct evemu_device *dev);
"evemu_get_id_product": {
"argtypes": (c_void_p,),
"restype": c_uint
},
#void evemu_set_id_product(struct evemu_device *dev,
# unsigned int product);
"evemu_set_id_product": {
"argtypes": (c_void_p, c_uint),
"restype": None
},
#unsigned int evemu_get_id_version(const struct evemu_device *dev);
"evemu_get_id_version": {
"argtypes": (c_void_p,),
"restype": c_uint
},
#void evemu_set_id_version(struct evemu_device *dev,
# unsigned int version);
"evemu_set_id_version": {
"argtypes": (c_void_p, c_uint),
"restype": None
},
#int evemu_get_abs_current_value(const struct evemu_device *dev,
# int code);
"evemu_get_abs_current_value": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#int evemu_get_abs_minimum(const struct evemu_device *dev, int code);
"evemu_get_abs_minimum": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#void evemu_set_abs_minimum(struct evemu_device *dev, int code,
# int min);
"evemu_set_abs_minimum": {
"argtypes": (c_void_p, c_int, c_int),
"restype": None
},
#int evemu_get_abs_maximum(const struct evemu_device *dev, int code);
"evemu_get_abs_maximum": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#void evemu_set_abs_maximum(struct evemu_device *dev, int code,
# int max);
"evemu_set_abs_maximum": {
"argtypes": (c_void_p, c_int, c_int),
"restype": None
},
#int evemu_get_abs_fuzz(const struct evemu_device *dev, int code);
"evemu_get_abs_fuzz": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#void evemu_set_abs_fuzz(struct evemu_device *dev, int code, int fuzz);
"evemu_set_abs_fuzz": {
"argtypes": (c_void_p, c_int, c_int),
"restype": None,
},
#int evemu_get_abs_flat(const struct evemu_device *dev, int code);
"evemu_get_abs_flat": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#void evemu_set_abs_flat(struct evemu_device *dev, int code, int flat);
"evemu_set_abs_flat": {
"argtypes": (c_void_p, c_int, c_int),
"restype": None
},
#int evemu_get_abs_resolution(const struct evemu_device *dev,
# int code);
"evemu_get_abs_resolution": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#void evemu_set_abs_resolution(struct evemu_device *dev, int code,
# int res);
"evemu_set_abs_resolution": {
"argtypes": (c_void_p, c_int, c_int),
"restype": None
},
#int evemu_has_prop(const struct evemu_device *dev, int code);
"evemu_has_prop": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#int evemu_has_event(const struct evemu_device *dev, int type,
# int code);
"evemu_has_event": {
"argtypes": (c_void_p, c_int, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#int evemu_has_bit(const struct evemu_device *dev, int type);
"evemu_has_bit": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_ge_zero
},
#int evemu_extract(struct evemu_device *dev, int fd);
"evemu_extract": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_write(const struct evemu_device *dev, FILE *fp);
"evemu_write": {
"argtypes": (c_void_p, c_void_p),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_read(struct evemu_device *dev, FILE *fp);
"evemu_read": {
"argtypes": (c_void_p, c_void_p),
"restype": c_int,
"errcheck": expect_gt_zero
},
#int evemu_write_event(FILE *fp, const struct input_event *ev);
"evemu_write_event": {
"argtypes": (c_void_p, c_void_p),
"restype": c_int,
"errcheck": expect_gt_zero
},
#int evemu_create_event(struct input_event *ev, int type, int code,
# int value);
"evemu_create_event": {
"argtypes": (c_void_p, c_int, c_int, c_int),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_read_event(FILE *fp, struct input_event *ev);
"evemu_read_event": {
"argtypes": (c_void_p, c_void_p),
"restype": c_int
},
#int evemu_read_event_realtime(FILE *fp, struct input_event *ev,
# struct timeval *evtime);
"evemu_read_event_realtime": {
"argtypes": (c_void_p, c_void_p, c_void_p),
"restype": c_int,
"errcheck": expect_gt_zero
},
#int evemu_record(FILE *fp, int fd, int ms);
"evemu_record": {
"argtypes": (c_void_p, c_int, c_int),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_play_one(int fd, const struct input_event *ev);
"evemu_play_one": {
"argtypes": (c_int, c_void_p),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_play(FILE *fp, int fd);
"evemu_play": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_create(struct evemu_device *dev, int fd);
"evemu_create": {
"argtypes": (c_void_p, c_int),
"restype": c_int,
"errcheck": expect_eq_zero
},
#int evemu_create_managed(struct evemu_device *dev);
"evemu_create_managed": {
"argtypes": (c_void_p,),
"restype": c_int,
"errcheck": expect_eq_zero
},
#void evemu_destroy(struct evemu_device *dev);
"evemu_destroy": {
"argtypes": (c_void_p,),
"restype": None
},
}
class InputEvent(ctypes.Structure):
_fields_ = [("sec", c_long),
("usec", c_long),
("type", c_uint16),
("code", c_uint16),
("value", c_int32)]
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