@@ -80,7 +80,7 @@ def updatecache(filename, module_globals=None):
     try:
         stat = os.stat(fullname)
     except os.error as msg:
-        basename = os.path.split(filename)[1]
+        basename = filename
 
         # Try for a __loader__, if available
         if module_globals and '__loader__' in module_globals:
@@ -104,7 +104,10 @@ def updatecache(filename, module_globals=None):
                     )
                     return cache[filename][2]
 
-        # Try looking through the module search path.
+        # Try looking through the module search path, which is only useful
+        # when handling a relative filename.
+        if os.path.isabs(filename):
+            return []
 
         for dirname in sys.path:
             try:
 
@@ -0,0 +1,129 @@
+""" Tests for the linecache module """
+
+import linecache
+import unittest
+import os.path
+from test import support
+
+
+FILENAME = linecache.__file__
+INVALID_NAME = '!@$)(!@#_1'
+EMPTY = ''
+TESTS = 'cjkencodings_test inspect_fodder inspect_fodder2 mapping_tests'
+TESTS = TESTS.split()
+TEST_PATH = os.path.dirname(support.__file__)
+MODULES = "linecache unittest".split()
+MODULE_PATH = os.path.dirname(FILENAME)
+
+SOURCE_1 = '''
+" Docstring "
+
+def function():
+    return result
+
+'''
+
+SOURCE_2 = '''
+def f():
+    return 1 + 1
+
+a = f()
+
+'''
+
+class LineCacheTests(unittest.TestCase):
+
+    def test_getline(self):
+        getline = linecache.getline
+
+        # Bad values for line number should return an empty string
+        self.assertEquals(getline(FILENAME, 2**15), EMPTY)
+        self.assertEquals(getline(FILENAME, -1), EMPTY)
+
+        # Float values currently raise TypeError, should it?
+        self.assertRaises(TypeError, getline, FILENAME, 1.1)
+
+        # Bad filenames should return an empty string
+        self.assertEquals(getline(EMPTY, 1), EMPTY)
+        self.assertEquals(getline(INVALID_NAME, 1), EMPTY)
+
+        # Check whether lines correspond to those from file iteration
+        for entry in TESTS:
+            filename = os.path.join(TEST_PATH, entry) + '.py'
+            for index, line in enumerate(open(filename)):
+                self.assertEquals(line, getline(filename, index + 1))
+
+        # Check module loading
+        for entry in MODULES:
+            filename = os.path.join(MODULE_PATH, entry) + '.py'
+            for index, line in enumerate(open(filename)):
+                self.assertEquals(line, getline(filename, index + 1))
+
+        # Check that bogus data isn't returned (issue #1309567)
+        empty = linecache.getlines('a/b/c/__init__.py')
+        self.assertEquals(empty, [])
+
+    def test_clearcache(self):
+        cached = []
+        for entry in TESTS:
+            filename = os.path.join(TEST_PATH, entry) + '.py'
+            cached.append(filename)
+            linecache.getline(filename, 1)
+
+        # Are all files cached?
+        cached_empty = [fn for fn in cached if fn not in linecache.cache]
+        self.assertEquals(cached_empty, [])
+
+        # Can we clear the cache?
+        linecache.clearcache()
+        cached_empty = [fn for fn in cached if fn in linecache.cache]
+        self.assertEquals(cached_empty, [])
+
+    def test_checkcache(self):
+        getline = linecache.getline
+        try:
+            # Create a source file and cache its contents
+            source_name = os.path.join(TEST_PATH, 'linecache_test.py')
+            source = open(source_name, 'w')
+            source.write(SOURCE_1)
+            source.close()
+            getline(source_name, 1)
+
+            # Keep a copy of the old contents
+            source_list = []
+            source = open(source_name)
+            for index, line in enumerate(source):
+                self.assertEquals(line, getline(source_name, index + 1))
+                source_list.append(line)
+            source.close()
+
+            source = open(source_name, 'w')
+            source.write(SOURCE_2)
+            source.close()
+
+            # Try to update a bogus cache entry
+            linecache.checkcache('dummy')
+
+            # Check that the cache matches the old contents
+            for index, line in enumerate(source_list):
+                self.assertEquals(line, getline(source_name, index + 1))
+
+            # Update the cache and check whether it matches the new source file
+            linecache.checkcache(source_name)
+            source = open(source_name)
+            for index, line in enumerate(source):
+                self.assertEquals(line, getline(source_name, index + 1))
+                source_list.append(line)
+            source.close()
+
+        finally:
+            try:
+                source.close()
+            finally:
+                support.unlink(source_name)
+
+def test_main():
+    support.run_unittest(LineCacheTests)
+
+if __name__ == "__main__":
+    test_main()
@@ -118,6 +118,9 @@ Installation
 Library
 -------
 
+- Issue #1309567: Fix linecache behavior of stripping subdirectories when
+  looking for files given by a relative filename.
+
 - Issue #5923: Update the ``turtle`` module to version 1.1, add two new
   turtle demos in Demo/turtle.