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authorZac Medico <zmedico@gentoo.org>2012-10-25 08:34:37 (GMT)
committerZac Medico <zmedico@gentoo.org>2012-10-25 08:34:37 (GMT)
commit978f3c6d514f0fcf9329d536cc43cf1230e23112 (patch)
tree9438c9df0111770cbd072d1bac26893d90a363c2
parentdblink: add hooks to sync disk for bug #439584 (diff)
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Add portage.util._ctypes module, for bug #439584.
-rw-r--r--pym/portage/util/_ctypes.py47
1 files changed, 47 insertions, 0 deletions
diff --git a/pym/portage/util/_ctypes.py b/pym/portage/util/_ctypes.py
new file mode 100644
index 0000000..4e5aa2a
--- /dev/null
+++ b/pym/portage/util/_ctypes.py
@@ -0,0 +1,47 @@
+# Copyright 2012 Gentoo Foundation
+# Distributed under the terms of the GNU General Public License v2
+
+try:
+ import ctypes
+ import ctypes.util
+except ImportError:
+ ctypes = None
+else:
+ try:
+ ctypes.cdll
+ except AttributeError:
+ ctypes = None
+
+_library_names = {}
+
+def find_library(name):
+ """
+ Calls ctype.util.find_library() if the ctypes module is available,
+ and otherwise returns None. Results are cached for future invocations.
+ """
+ filename = _library_names.get(name)
+ if filename is None:
+ if ctypes is not None:
+ filename = ctypes.util.find_library(name)
+ if filename is None:
+ filename = False
+ _library_names[name] = filename
+
+ if filename is False:
+ return None
+ return filename
+
+_library_handles = {}
+
+def LoadLibrary(name):
+ """
+ Calls ctypes.cdll.LoadLibrary(name) if the ctypes module is available,
+ and otherwise returns None. Results are cached for future invocations.
+ """
+ handle = _library_handles.get(name)
+
+ if handle is None and ctypes is not None:
+ handle = ctypes.cdll.LoadLibrary(name)
+ _library_handles[name] = handle
+
+ return handle