diff --git a/Doc/library/hashlib.rst b/Doc/library/hashlib.rst
index 8bba6700930bf4..b21ecdaede622a 100644
--- a/Doc/library/hashlib.rst
+++ b/Doc/library/hashlib.rst
@@ -310,7 +310,7 @@ a file or file-like object.
    .. versionadded:: 3.11
 
    .. versionchanged:: 3.14
-      Now raises a :exc:`BlockingIOError` if the file is opened in blocking
+      Now raises a :exc:`BlockingIOError` if the file is opened in non-blocking
       mode. Previously, spurious null bytes were added to the digest.
 
 
diff --git a/Lib/test/test_os/test_os.py b/Lib/test/test_os/test_os.py
index 623d05235835c2..371771087aaf88 100644
--- a/Lib/test/test_os/test_os.py
+++ b/Lib/test/test_os/test_os.py
@@ -3197,13 +3197,16 @@ def test_spawnvpe_invalid_env(self):
         self._test_invalid_env(os.spawnvpe)
 
 
-# The introduction of this TestCase caused at least two different errors on
-# *nix buildbots. Temporarily skip this to let the buildbots move along.
-@unittest.skip("Skip due to platform/environment differences on *NIX buildbots")
 @unittest.skipUnless(hasattr(os, 'getlogin'), "test needs os.getlogin")
 class LoginTests(unittest.TestCase):
     def test_getlogin(self):
-        user_name = os.getlogin()
+        try:
+            user_name = os.getlogin()
+        except OSError as exc:
+            if exc.errno in (errno.ENOTTY, errno.ENXIO):
+                self.skipTest(str(exc))
+            else:
+                raise
         self.assertNotEqual(len(user_name), 0)
 
 
@@ -4080,6 +4083,7 @@ def test_oserror_filename(self):
             (self.filenames, os.listdir,),
             (self.filenames, os.rename, "dst"),
             (self.filenames, os.replace, "dst"),
+            (self.filenames, os.utime, None),
         ]
         if os_helper.can_chmod():
             funcs.append((self.filenames, os.chmod, 0o777))
@@ -4120,6 +4124,19 @@ def test_oserror_filename(self):
                 else:
                     self.fail(f"No exception thrown by {func}")
 
+    def test_mkdir(self):
+        filename = os_helper.TESTFN
+        subdir = os.path.join(filename, 'subdir')
+        self.assertRaises(FileNotFoundError, os.mkdir, subdir)
+
+        self.addCleanup(os_helper.unlink, filename)
+        create_file(filename)
+        self.assertRaises(FileExistsError, os.mkdir, filename)
+
+        self.assertRaises((NotADirectoryError, FileNotFoundError),
+                          os.mkdir, subdir)
+
+
 class CPUCountTests(unittest.TestCase):
     def check_cpu_count(self, cpus):
         if cpus is None:
diff --git a/Lib/test/test_os/test_windows.py b/Lib/test/test_os/test_windows.py
index b306a037399fc8..f1c6283f60d35e 100644
--- a/Lib/test/test_os/test_windows.py
+++ b/Lib/test/test_os/test_windows.py
@@ -21,41 +21,6 @@
 from .utils import create_file
 
 
-class Win32ErrorTests(unittest.TestCase):
-    def setUp(self):
-        try:
-            os.stat(os_helper.TESTFN)
-        except FileNotFoundError:
-            exists = False
-        except OSError as exc:
-            exists = True
-            self.fail("file %s must not exist; os.stat failed with %s"
-                      % (os_helper.TESTFN, exc))
-        else:
-            self.fail("file %s must not exist" % os_helper.TESTFN)
-
-    def test_rename(self):
-        self.assertRaises(OSError, os.rename, os_helper.TESTFN, os_helper.TESTFN+".bak")
-
-    def test_remove(self):
-        self.assertRaises(OSError, os.remove, os_helper.TESTFN)
-
-    def test_chdir(self):
-        self.assertRaises(OSError, os.chdir, os_helper.TESTFN)
-
-    def test_mkdir(self):
-        self.addCleanup(os_helper.unlink, os_helper.TESTFN)
-
-        with open(os_helper.TESTFN, "x") as f:
-            self.assertRaises(OSError, os.mkdir, os_helper.TESTFN)
-
-    def test_utime(self):
-        self.assertRaises(OSError, os.utime, os_helper.TESTFN, None)
-
-    def test_chmod(self):
-        self.assertRaises(OSError, os.chmod, os_helper.TESTFN, 0)
-
-
 class Win32KillTests(unittest.TestCase):
     def _kill(self, sig):
         # Start sys.executable as a subprocess and communicate from the
diff --git a/Misc/NEWS.d/next/Library/2025-10-02-15-45-08.gh-issue-139322.rouPGj.rst b/Misc/NEWS.d/next/Library/2025-10-02-15-45-08.gh-issue-139322.rouPGj.rst
new file mode 100644
index 00000000000000..39cae22474c4db
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-10-02-15-45-08.gh-issue-139322.rouPGj.rst
@@ -0,0 +1,2 @@
+Fix :func:`os.getlogin` error handling: fix the error number. Patch by
+Victor Stinner.
diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index b7a0110226590e..f50167c223e2fc 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -9605,7 +9605,7 @@ os_getlogin_impl(PyObject *module)
     int err = getlogin_r(name, sizeof(name));
     if (err) {
         int old_errno = errno;
-        errno = -err;
+        errno = err;
         posix_error();
         errno = old_errno;
     }