gh-83854: Map errno==ETIME to TimeoutError

Doc/library/exceptions.rst

@@ -789,6 +789,9 @@ depending on the system error code.
    Raised when a system function timed out at the system level.
    Corresponds to :c:data:`errno` :py:const:`~errno.ETIMEDOUT`.
 
+   .. versionchanged:: 3.10
+      ``ETIME`` is now mapped to :exc:`TimeoutError`.
+
 .. versionadded:: 3.3
    All the above :exc:`OSError` subclasses were added.
 

Lib/test/test_exception_hierarchy.py

@@ -65,7 +65,7 @@ def test_select_error(self):
         +-- NotADirectoryError                                        ENOTDIR
         +-- PermissionError                        EACCES, EPERM, ENOTCAPABLE
         +-- ProcessLookupError                                          ESRCH
-        +-- TimeoutError                                            ETIMEDOUT
+        +-- TimeoutError                                     ETIME, ETIMEDOUT
     """
     def _make_map(s):
         _map = {}

Misc/NEWS.d/next/Library/2020-05-19-23-16-53.bpo-39673.ppfScY.rst

@@ -0,0 +1 @@
+Map :exc:`OSError` with ``errno==ETIME`` to :exc:`TimeoutError`.

Objects/exceptions.c

@@ -3741,6 +3741,7 @@ _PyExc_InitState(PyInterpreterState *interp)
 #endif
     ADD_ERRNO(ProcessLookupError, ESRCH);
     ADD_ERRNO(TimeoutError, ETIMEDOUT);
+    ADD_ERRNO(TimeoutError, ETIME);
 
     return _PyStatus_OK();