diff -r c1c45755397b Lib/test/test_posix.py
--- a/Lib/test/test_posix.py	Tue Aug 21 19:44:00 2012 +0200
+++ b/Lib/test/test_posix.py	Fri Aug 24 15:22:21 2012 +0000
@@ -405,8 +405,16 @@
                             _create_and_do_getcwd(dirname, current_path_length + len(dirname) + 1)
                     except OSError as e:
                         expected_errno = errno.ENAMETOOLONG
-                        if 'sunos' in sys.platform or 'openbsd' in sys.platform:
-                            expected_errno = errno.ERANGE # Issue 9185
+                        # The following platforms have quirky getcwd()
+                        # behaviour -- see issue 9185 and 15765 for
+                        # more information.
+                        quirky_platform = (
+                            'sunos' in sys.platform or
+                            'netbsd' in sys.platform or
+                            'openbsd' in sys.platform
+                        )
+                        if quirky_platform:
+                            expected_errno = errno.ERANGE
                         self.assertEqual(e.errno, expected_errno)
                     finally:
                         os.chdir('..')
diff -r c1c45755397b Modules/posixmodule.c
--- a/Modules/posixmodule.c	Tue Aug 21 19:44:00 2012 +0200
+++ b/Modules/posixmodule.c	Fri Aug 24 15:22:21 2012 +0000
@@ -1956,7 +1956,9 @@
 "getcwd() -> path\n\n\
 Return a string representing the current working directory.");
 
-#if (defined(__sun) && defined(__SVR4)) || defined(__OpenBSD__)
+#if (defined(__sun) && defined(__SVR4)) || \
+     defined(__OpenBSD__)               || \
+     defined(__NetBSD__)
 /* Issue 9185: getcwd() returns NULL/ERANGE indefinitely. */
 static PyObject *
 posix_getcwd(PyObject *self, PyObject *noargs)