lazy load libc to defer errors finding it until after import

inotify_simple/inotify_simple.py

@@ -52,8 +52,13 @@ class LongEnum(long, enum.Enum): pass
 
 __all__ = ['flags', 'masks', 'parse_events', 'INotify', 'Event']
 
-_libc = ctypes.cdll.LoadLibrary('libc.so.6')
-_libc.__errno_location.restype = ctypes.POINTER(ctypes.c_int)
+_libc = None
+
+def _ensure_libc_loaded():
+    global _libc
+    if _libc is None:
+        _libc = ctypes.cdll.LoadLibrary('libc.so.6')
+        _libc.__errno_location.restype = ctypes.POINTER(ctypes.c_int)
 
 def _libc_call(function, *args):
     """Wrapper which raises errors and retries on EINTR."""
@@ -78,6 +83,7 @@ def __init__(self):
         #: The inotify file descriptor returned by ``inotify_init()``. You are
         #: free to use it directly with ``os.read`` if you'd prefer not to call
         #: :func:`~inotify_simple.INotify.read` for some reason.
+        _ensure_libc_loaded()
         self.fd = _libc_call(_libc.inotify_init)
         self._poller = select.poll()
         self._poller.register(self.fd)

setup.py

@@ -14,10 +14,10 @@
 import os
 from distutils.core import setup
 
-__version__ = '1.1.7'
+__version__ = '1.1.8'
 
 DESCRIPTION = ("A simple wrapper around inotify. No fancy bells and whistles, " +
-               "just a literal wrapper with ctypes. Only 122 lines of code!")
+               "just a literal wrapper with ctypes. Only 127 lines of code!")
 
 # Auto generate a __version__ package for the package to import
 with open(os.path.join('inotify_simple', '__version__.py'), 'w') as f: