diff --git a/Modules/_io/clinic/textio.c.h b/Modules/_io/clinic/textio.c.h
index db968e884cc805..01965013ec6abc 100644
--- a/Modules/_io/clinic/textio.c.h
+++ b/Modules/_io/clinic/textio.c.h
@@ -8,6 +8,171 @@ preserve
 #endif
 
 
+PyDoc_STRVAR(_io__TextIOBase_detach__doc__,
+"detach($self, /)\n"
+"--\n"
+"\n"
+"Separate the underlying buffer from the TextIOBase and return it.\n"
+"\n"
+"After the underlying buffer has been detached, the TextIO is in an unusable state.");
+
+#define _IO__TEXTIOBASE_DETACH_METHODDEF    \
+    {"detach", _PyCFunction_CAST(_io__TextIOBase_detach), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io__TextIOBase_detach__doc__},
+
+static PyObject *
+_io__TextIOBase_detach_impl(PyObject *self, PyTypeObject *cls);
+
+static PyObject *
+_io__TextIOBase_detach(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    if (nargs) {
+        PyErr_SetString(PyExc_TypeError, "detach() takes no arguments");
+        return NULL;
+    }
+    return _io__TextIOBase_detach_impl(self, cls);
+}
+
+PyDoc_STRVAR(_io__TextIOBase_read__doc__,
+"read($self, /, *args)\n"
+"--\n"
+"\n"
+"Read at most size characters from stream.\n"
+"\n"
+"Read from underlying buffer until we have size characters or we hit EOF.\n"
+"If size is negative or omitted, read until EOF.");
+
+#define _IO__TEXTIOBASE_READ_METHODDEF    \
+    {"read", _PyCFunction_CAST(_io__TextIOBase_read), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io__TextIOBase_read__doc__},
+
+static PyObject *
+_io__TextIOBase_read_impl(PyObject *self, PyTypeObject *cls, PyObject *args);
+
+static PyObject *
+_io__TextIOBase_read(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
+    #else
+    #  define KWTUPLE NULL
+    #endif
+
+    static const char * const _keywords[] = { NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "read",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    PyObject *__clinic_args = NULL;
+
+    args = _PyArg_UnpackKeywordsWithVararg(args, nargs, NULL, kwnames, &_parser, 0, 0, 0, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    __clinic_args = args[0];
+    return_value = _io__TextIOBase_read_impl(self, cls, __clinic_args);
+
+exit:
+    Py_XDECREF(__clinic_args);
+    return return_value;
+}
+
+PyDoc_STRVAR(_io__TextIOBase_readline__doc__,
+"readline($self, /, *args)\n"
+"--\n"
+"\n"
+"Read until newline or EOF.\n"
+"\n"
+"Return an empty string if EOF is hit immediately.");
+
+#define _IO__TEXTIOBASE_READLINE_METHODDEF    \
+    {"readline", _PyCFunction_CAST(_io__TextIOBase_readline), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io__TextIOBase_readline__doc__},
+
+static PyObject *
+_io__TextIOBase_readline_impl(PyObject *self, PyTypeObject *cls,
+                              PyObject *args);
+
+static PyObject *
+_io__TextIOBase_readline(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
+    #else
+    #  define KWTUPLE NULL
+    #endif
+
+    static const char * const _keywords[] = { NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "readline",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    PyObject *__clinic_args = NULL;
+
+    args = _PyArg_UnpackKeywordsWithVararg(args, nargs, NULL, kwnames, &_parser, 0, 0, 0, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    __clinic_args = args[0];
+    return_value = _io__TextIOBase_readline_impl(self, cls, __clinic_args);
+
+exit:
+    Py_XDECREF(__clinic_args);
+    return return_value;
+}
+
+PyDoc_STRVAR(_io__TextIOBase_write__doc__,
+"write($self, /, *args)\n"
+"--\n"
+"\n"
+"Write string to stream.\n"
+"\n"
+"Return the number of characters written\n"
+"(which is always equal to the length of the string).");
+
+#define _IO__TEXTIOBASE_WRITE_METHODDEF    \
+    {"write", _PyCFunction_CAST(_io__TextIOBase_write), METH_METHOD|METH_FASTCALL|METH_KEYWORDS, _io__TextIOBase_write__doc__},
+
+static PyObject *
+_io__TextIOBase_write_impl(PyObject *self, PyTypeObject *cls, PyObject *args);
+
+static PyObject *
+_io__TextIOBase_write(PyObject *self, PyTypeObject *cls, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
+{
+    PyObject *return_value = NULL;
+    #if defined(Py_BUILD_CORE) && !defined(Py_BUILD_CORE_MODULE)
+    #  define KWTUPLE (PyObject *)&_Py_SINGLETON(tuple_empty)
+    #else
+    #  define KWTUPLE NULL
+    #endif
+
+    static const char * const _keywords[] = { NULL};
+    static _PyArg_Parser _parser = {
+        .keywords = _keywords,
+        .fname = "write",
+        .kwtuple = KWTUPLE,
+    };
+    #undef KWTUPLE
+    PyObject *argsbuf[1];
+    PyObject *__clinic_args = NULL;
+
+    args = _PyArg_UnpackKeywordsWithVararg(args, nargs, NULL, kwnames, &_parser, 0, 0, 0, 0, argsbuf);
+    if (!args) {
+        goto exit;
+    }
+    __clinic_args = args[0];
+    return_value = _io__TextIOBase_write_impl(self, cls, __clinic_args);
+
+exit:
+    Py_XDECREF(__clinic_args);
+    return return_value;
+}
+
 PyDoc_STRVAR(_io_IncrementalNewlineDecoder___init____doc__,
 "IncrementalNewlineDecoder(decoder, translate, errors=\'strict\')\n"
 "--\n"
@@ -769,4 +934,4 @@ _io_TextIOWrapper_close(textio *self, PyObject *Py_UNUSED(ignored))
 {
     return _io_TextIOWrapper_close_impl(self);
 }
-/*[clinic end generated code: output=73f84b13c343b34b input=a9049054013a1b77]*/
+/*[clinic end generated code: output=d800e5a8a50d6720 input=a9049054013a1b77]*/
diff --git a/Modules/_io/textio.c b/Modules/_io/textio.c
index 070687a83d1bc2..96f5e0c45f51b8 100644
--- a/Modules/_io/textio.c
+++ b/Modules/_io/textio.c
@@ -20,8 +20,16 @@
 module _io
 class _io.IncrementalNewlineDecoder "nldecoder_object *" "clinic_state()->PyIncrementalNewlineDecoder_Type"
 class _io.TextIOWrapper "textio *" "clinic_state()->TextIOWrapper_Type"
+class _io._TextIOBase "PyObject *" "&PyTextIOBase_Type"
 [clinic start generated code]*/
-/*[clinic end generated code: output=da39a3ee5e6b4b0d input=81f67cf54eaa6001]*/
+/*[clinic end generated code: output=da39a3ee5e6b4b0d input=8b7f24fa13bfdd7f]*/
+
+typedef struct nldecoder_object nldecoder_object;
+typedef struct textio textio;
+
+#define clinic_state() (find_io_state_by_def(Py_TYPE(self)))
+#include "clinic/textio.c.h"
+#undef clinic_state
 
 /* TextIOBase */
 
@@ -42,52 +50,76 @@ _unsupported(const char *message)
     return NULL;
 }
 
-PyDoc_STRVAR(textiobase_detach_doc,
-    "Separate the underlying buffer from the TextIOBase and return it.\n"
-    "\n"
-    "After the underlying buffer has been detached, the TextIO is in an\n"
-    "unusable state.\n"
-    );
+/*[clinic input]
+_io._TextIOBase.detach
+    cls: defining_class
+    /
+
+Separate the underlying buffer from the TextIOBase and return it.
+
+After the underlying buffer has been detached, the TextIO is in an unusable state.
+[clinic start generated code]*/
 
 static PyObject *
-textiobase_detach(PyObject *self, PyObject *Py_UNUSED(ignored))
+_io__TextIOBase_detach_impl(PyObject *self, PyTypeObject *cls)
+/*[clinic end generated code: output=50915f40c609eaa4 input=987ca3640d0a3776]*/
 {
     return _unsupported("detach");
 }
 
-PyDoc_STRVAR(textiobase_read_doc,
-    "Read at most size characters from stream.\n"
-    "\n"
-    "Read from underlying buffer until we have size characters or we hit EOF.\n"
-    "If size is negative or omitted, read until EOF.\n"
-    );
+/*[clinic input]
+_io._TextIOBase.read
+    cls: defining_class
+    /
+    *args: object
+
+Read at most size characters from stream.
+
+Read from underlying buffer until we have size characters or we hit EOF.
+If size is negative or omitted, read until EOF.
+[clinic start generated code]*/
 
 static PyObject *
-textiobase_read(PyObject *self, PyObject *args)
+_io__TextIOBase_read_impl(PyObject *self, PyTypeObject *cls, PyObject *args)
+/*[clinic end generated code: output=3adf28998831f461 input=cee1e84664a20de0]*/
 {
     return _unsupported("read");
 }
 
-PyDoc_STRVAR(textiobase_readline_doc,
-    "Read until newline or EOF.\n"
-    "\n"
-    "Returns an empty string if EOF is hit immediately.\n"
-    );
+/*[clinic input]
+_io._TextIOBase.readline
+    cls: defining_class
+    /
+    *args: object
+
+Read until newline or EOF.
+
+Return an empty string if EOF is hit immediately.
+[clinic start generated code]*/
 
 static PyObject *
-textiobase_readline(PyObject *self, PyObject *args)
+_io__TextIOBase_readline_impl(PyObject *self, PyTypeObject *cls,
+                              PyObject *args)
+/*[clinic end generated code: output=3073a948d02319f3 input=58f801259f7ff3ef]*/
 {
     return _unsupported("readline");
 }
 
-PyDoc_STRVAR(textiobase_write_doc,
-    "Write string to stream.\n"
-    "Returns the number of characters written (which is always equal to\n"
-    "the length of the string).\n"
-    );
+/*[clinic input]
+_io._TextIOBase.write
+    cls: defining_class
+    /
+    *args: object
+
+Write string to stream.
+
+Return the number of characters written
+(which is always equal to the length of the string).
+[clinic start generated code]*/
 
 static PyObject *
-textiobase_write(PyObject *self, PyObject *args)
+_io__TextIOBase_write_impl(PyObject *self, PyTypeObject *cls, PyObject *args)
+/*[clinic end generated code: output=5d985eb529472bc4 input=21b6961b5cba9496]*/
 {
     return _unsupported("write");
 }
@@ -132,10 +164,10 @@ textiobase_errors_get(PyObject *self, void *context)
 
 
 static PyMethodDef textiobase_methods[] = {
-    {"detach", textiobase_detach, METH_NOARGS, textiobase_detach_doc},
-    {"read", textiobase_read, METH_VARARGS, textiobase_read_doc},
-    {"readline", textiobase_readline, METH_VARARGS, textiobase_readline_doc},
-    {"write", textiobase_write, METH_VARARGS, textiobase_write_doc},
+    _IO__TEXTIOBASE_DETACH_METHODDEF
+    _IO__TEXTIOBASE_READ_METHODDEF
+    _IO__TEXTIOBASE_READLINE_METHODDEF
+    _IO__TEXTIOBASE_WRITE_METHODDEF
     {NULL, NULL}
 };
 
@@ -200,14 +232,14 @@ PyTypeObject PyTextIOBase_Type = {
 
 /* IncrementalNewlineDecoder */
 
-typedef struct {
+struct nldecoder_object {
     PyObject_HEAD
     PyObject *decoder;
     PyObject *errors;
     unsigned int pendingcr: 1;
     unsigned int translate: 1;
     unsigned int seennl: 3;
-} nldecoder_object;
+};
 
 /*[clinic input]
 _io.IncrementalNewlineDecoder.__init__
@@ -645,7 +677,7 @@ incrementalnewlinedecoder_newlines_get(nldecoder_object *self, void *context)
 typedef PyObject *
         (*encodefunc_t)(PyObject *, PyObject *);
 
-typedef struct
+struct textio
 {
     PyObject_HEAD
     int ok; /* initialized? */
@@ -704,7 +736,7 @@ typedef struct
     PyObject *dict;
 
     _PyIO_State *state;
-} textio;
+};
 
 static void
 textiowrapper_set_decoded_chars(textio *self, PyObject *chars);
@@ -3179,10 +3211,6 @@ textiowrapper_chunk_size_set(textio *self, PyObject *arg, void *context)
     return 0;
 }
 
-#define clinic_state() (find_io_state_by_def(Py_TYPE(self)))
-#include "clinic/textio.c.h"
-#undef clinic_state
-
 static PyMethodDef incrementalnewlinedecoder_methods[] = {
     _IO_INCREMENTALNEWLINEDECODER_DECODE_METHODDEF
     _IO_INCREMENTALNEWLINEDECODER_GETSTATE_METHODDEF