gh-90473: Decrease recursion limit and skip tests on WASI (GH-92803)

Lib/test/test_os.py

@@ -11,7 +11,6 @@ import fnmatch
 import fractions
 import itertools
 import locale
-import mmap
 import os
 import pickle
 import select
@@ -59,6 +58,10 @@ try:
 except ImportError:
     INT_MAX = PY_SSIZE_T_MAX = sys.maxsize
 
+try:
+    import mmap
+except ImportError:
+    mmap = None
 
 from test.support.script_helper import assert_python_ok
 from test.support import unix_shell
@@ -2167,7 +2170,8 @@ class TestInvalidFD(unittest.TestCase):
 
     @unittest.skipUnless(hasattr(os, 'fpathconf'), 'test needs os.fpathconf()')
     @unittest.skipIf(
-        support.is_emscripten, "musl libc issue on Emscripten, bpo-46390"
+        support.is_emscripten or support.is_wasi,
+        "musl libc issue on Emscripten/WASI, bpo-46390"
     )
     def test_fpathconf(self):
         self.check(os.pathconf, "PC_NAME_MAX")
@@ -2460,6 +2464,7 @@ class Win32KillTests(unittest.TestCase):
         # os.kill on Windows can take an int which gets set as the exit code
         self._kill(100)
 
+    @unittest.skipIf(mmap is None, "requires mmap")
     def _kill_with_event(self, event, name):
         tagname = "test_os_%s" % uuid.uuid1()
         m = mmap.mmap(-1, 1, tagname)