gh-90473: WASI: Mark tests that require os.pipe() (GH-92837)

Lib/test/test_atexit.py

@@ -82,6 +82,7 @@ class SubinterpreterTest(unittest.TestCase):
         self.assertEqual(ret, 0)
         self.assertEqual(atexit._ncallbacks(), n)
 
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_callback_on_subinterpreter_teardown(self):
         # This tests if a callback is called on
         # subinterpreter teardown.

Lib/test/test_capi.py

@@ -788,6 +788,7 @@ class TestPendingCalls(unittest.TestCase):
 
 class SubinterpreterTest(unittest.TestCase):
 
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_subinterps(self):
         import builtins
         r, w = os.pipe()
@@ -803,6 +804,7 @@ class SubinterpreterTest(unittest.TestCase):
             self.assertNotEqual(pickle.load(f), id(sys.modules))
             self.assertNotEqual(pickle.load(f), id(builtins))
 
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_subinterps_recent_language_features(self):
         r, w = os.pipe()
         code = """if 1:

Lib/test/test_io.py

@@ -429,6 +429,7 @@ class IOTest(unittest.TestCase):
     @unittest.skipIf(
         support.is_emscripten, "fstat() of a pipe fd is not supported"
     )
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_optional_abilities(self):
         # Test for OSError when optional APIs are not supported
         # The purpose of this test is to try fileno(), reading, writing and
@@ -3970,6 +3971,7 @@ class MiscIOTest(unittest.TestCase):
     @unittest.skipIf(
         support.is_emscripten, "fstat() of a pipe fd is not supported"
     )
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_open_pipe_with_append(self):
         # bpo-27805: Ignore ESPIPE from lseek() in open().
         r, w = os.pipe()
@@ -4108,6 +4110,7 @@ class MiscIOTest(unittest.TestCase):
         with warnings_helper.check_no_resource_warning(self):
             open(r, *args, closefd=False, **kwargs)
 
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_warn_on_dealloc_fd(self):
         self._check_warn_on_dealloc_fd("rb", buffering=0)
         self._check_warn_on_dealloc_fd("rb")
@@ -4147,6 +4150,7 @@ class MiscIOTest(unittest.TestCase):
 
     @unittest.skipUnless(hasattr(os, 'set_blocking'),
                          'os.set_blocking() required for this test')
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def _test_nonblock_pipe_write(self, bufsize):
         sent = []
         received = []
@@ -4458,14 +4462,17 @@ class SignalsTest(unittest.TestCase):
                     raise
 
     @requires_alarm
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_interrupted_write_unbuffered(self):
         self.check_interrupted_write(b"xy", b"xy", mode="wb", buffering=0)
 
     @requires_alarm
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_interrupted_write_buffered(self):
         self.check_interrupted_write(b"xy", b"xy", mode="wb")
 
     @requires_alarm
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_interrupted_write_text(self):
         self.check_interrupted_write("xy", b"xy", mode="w", encoding="ascii")
 

Lib/test/test_signal.py

@@ -222,6 +222,7 @@ class WakeupFDTests(unittest.TestCase):
     # Emscripten does not support fstat on pipes yet.
     # https://github.com/emscripten-core/emscripten/issues/16414
     @unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_set_wakeup_fd_result(self):
         r1, w1 = os.pipe()
         self.addCleanup(os.close, r1)
@@ -260,6 +261,7 @@ class WakeupFDTests(unittest.TestCase):
     # function to test if a socket is in non-blocking mode.
     @unittest.skipIf(sys.platform == "win32", "tests specific to POSIX")
     @unittest.skipIf(support.is_emscripten, "Emscripten cannot fstat pipes.")
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_set_wakeup_fd_blocking(self):
         rfd, wfd = os.pipe()
         self.addCleanup(os.close, rfd)
@@ -320,6 +322,7 @@ class WakeupSignalTests(unittest.TestCase):
         assert_python_ok('-c', code)
 
     @unittest.skipIf(_testcapi is None, 'need _testcapi')
+    @unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
     def test_wakeup_write_error(self):
         # Issue #16105: write() errors in the C signal handler should not
         # pass silently.
@@ -659,6 +662,7 @@ class WakeupSocketSignalTests(unittest.TestCase):
 @unittest.skipIf(sys.platform == "win32", "Not valid on Windows")
 @unittest.skipUnless(hasattr(signal, 'siginterrupt'), "needs signal.siginterrupt()")
 @support.requires_subprocess()
+@unittest.skipUnless(hasattr(os, "pipe"), "requires os.pipe()")
 class SiginterruptTest(unittest.TestCase):
 
     def readpipe_interrupted(self, interrupt):