1 files changed, 16 insertions, 0 deletions
diff --git a/Lib/test/test_subprocess.py b/Lib/test/test_subprocess.py
index eb4e759..5d3e040 100644
--- a/Lib/test/test_subprocess.py
+++ b/Lib/test/test_subprocess.py
@@ -521,6 +521,22 @@ class ProcessTestCase(unittest.TestCase):
         p = subprocess.Popen([sys.executable, "-c", "pass"], bufsize=None)
         self.assertEqual(p.wait(), 0)
 
+    def test_leaking_fds_on_error(self):
+        # see bug #5179: Popen leaks file descriptors to PIPEs if
+        # the child fails to execute; this will eventually exhaust
+        # the maximum number of open fds. 1024 seems a very common
+        # value for that limit, but Windows has 2048, so we loop
+        # 1024 times (each call leaked two fds).
+        for i in range(1024):
+            try:
+                subprocess.Popen(['nonexisting_i_hope'],
+                                 stdout=subprocess.PIPE,
+                                 stderr=subprocess.PIPE)
+            # Windows raises IOError
+            except (IOError, OSError) as err:
+                if err.errno != 2:  # ignore "no such file"
+                    pass # XXX see #5312
+
     #
     # POSIX tests
     #