(Merge 3.3) Close #18109: os.uname() now decodes fields from the locale

encoding, and socket.gethostname() now decodes the hostname from the locale
encoding, instead of using the UTF-8 encoding in strict mode.

Misc/NEWS

@@ -103,6 +103,10 @@ Core and Builtins
 Library
 -------
 
+- Issue #18109: os.uname() now decodes fields from the locale encoding, and
+  socket.gethostname() now decodes the hostname from the locale encoding,
+  instead of using the UTF-8 encoding in strict mode.
+
 - Issue #18089: Implement importlib.abc.InspectLoader.load_module.
 
 - Issue #18088: Introduce importlib.abc.Loader.init_module_attrs for setting

Modules/posixmodule.c

@@ -4257,7 +4257,7 @@ posix_uname(PyObject *self, PyObject *noargs)
 
 #define SET(i, field) \
     { \
-    PyObject *o = PyUnicode_DecodeASCII(field, strlen(field), NULL); \
+    PyObject *o = PyUnicode_DecodeFSDefault(field); \
     if (!o) { \
         Py_DECREF(value); \
         return NULL; \

Modules/socketmodule.c

@@ -4048,7 +4048,7 @@ socket_gethostname(PyObject *self, PyObject *unused)
     if (res < 0)
         return set_error();
     buf[sizeof buf - 1] = '\0';
-    return PyUnicode_FromString(buf);
+    return PyUnicode_DecodeFSDefault(buf);
 #endif
 }