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import logging
import ctypes
import os
import inotify.library
_LOGGER = logging.getLogger(__name__)
_LIB = inotify.library.instance
class InotifyError(Exception):
def __init__(self, message, *args, **kwargs):
self._errno = ctypes.get_errno()
try:
self._errmsg = os.strerror(self.errno)
except:
self._errmsg = ''
message += " ERRNO=({}) [{}]".format(self._errno, self._errmsg)
super(InotifyError, self).__init__(message, *args, **kwargs)
@property
def errno(self):
return self._errno
@property
def errmsg(self):
return self._errmsg
def _check_zero(result):
if result != 0:
raise InotifyError("Call failed (should return zero): (%d)" %
(result,))
return result
def _check_nonzero(result):
if result == 0:
raise InotifyError("Call failed (should return nonzero): (%d)" %
(result,))
return result
def _check_nonnegative(result):
if result == -1:
raise InotifyError("Call failed (should not be -1): (%d)" %
(result,))
return result
inotify_init = _LIB.inotify_init
inotify_init.argtypes = []
inotify_init.restype = _check_nonnegative
inotify_add_watch = _LIB.inotify_add_watch
inotify_add_watch.argtypes = [
ctypes.c_int,
ctypes.c_char_p,
ctypes.c_uint32]
inotify_add_watch.restype = _check_nonnegative
inotify_rm_watch = _LIB.inotify_rm_watch
inotify_rm_watch.argtypes = [ctypes.c_int, ctypes.c_int]
inotify_rm_watch.restype = _check_nonnegative
if getattr(_LIB, 'errno', None) is not None:
errno = _LIB.errno
elif getattr(_LIB, 'err', None) is not None:
errno = _LIB.err
else:
raise EnvironmentError("'errno' not found in library")