/*

    An implementation of the new I/O lib as defined by PEP 3116 - "New I/O"

    Classes defined here: UnsupportedOperation, BlockingIOError.

    Functions defined here: open().

    Mostly written by Amaury Forgeot d'Arc

*/

#include "Python.h"

#include "pycore_abstract.h"      // _PyNumber_Index()

#include "pycore_interp.h"        // _PyInterpreterState_GetConfig()

#include "pycore_long.h"          // _PyLong_IsNegative()

#include "pycore_pyerrors.h"      // _PyErr_ChainExceptions1()

#include "pycore_pystate.h"       // _PyInterpreterState_GET()

#include "_iomodule.h"

#ifdef HAVE_SYS_TYPES_H

#include <sys/types.h>

#endif /* HAVE_SYS_TYPES_H */

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif /* HAVE_SYS_STAT_H */

#ifdef MS_WINDOWS

#include <windows.h>

#endif

PyDoc_STRVAR(module_doc,

"The io module provides the Python interfaces to stream handling. The\n"

"builtin open function is defined in this module.\n"

"\n"

"At the top of the I/O hierarchy is the abstract base class IOBase. It\n"

"defines the basic interface to a stream. Note, however, that there is no\n"

"separation between reading and writing to streams; implementations are\n"

"allowed to raise an OSError if they do not support a given operation.\n"

"\n"

"Extending IOBase is RawIOBase which deals simply with the reading and\n"

"writing of raw bytes to a stream. FileIO subclasses RawIOBase to provide\n"

"an interface to OS files.\n"

"\n"

"BufferedIOBase deals with buffering on a raw byte stream (RawIOBase). Its\n"

"subclasses, BufferedWriter, BufferedReader, and BufferedRWPair buffer\n"

"streams that are readable, writable, and both respectively.\n"

"BufferedRandom provides a buffered interface to random access\n"

"streams. BytesIO is a simple stream of in-memory bytes.\n"

"\n"

"Another IOBase subclass, TextIOBase, deals with the encoding and decoding\n"

"of streams into text. TextIOWrapper, which extends it, is a buffered text\n"

"interface to a buffered raw stream (`BufferedIOBase`). Finally, StringIO\n"

"is an in-memory stream for text.\n"

"\n"

"Argument names are not part of the specification, and only the arguments\n"

"of open() are intended to be used as keyword arguments.\n"

"\n"

"data:\n"

"\n"

"DEFAULT_BUFFER_SIZE\n"

"\n"

"   An int containing the default buffer size used by the module's buffered\n"

"   I/O classes.\n"

    );

/*

 * The main open() function

 */

/*[clinic input]

module _io

@permit_long_docstring_body

_io.open

    file: object

    mode: str = "r"

    buffering: int = -1

    encoding: str(accept={str, NoneType}) = None

    errors: str(accept={str, NoneType}) = None

    newline: str(accept={str, NoneType}) = None

    closefd: bool = True

    opener: object = None

Open file and return a stream.  Raise OSError upon failure.

file is either a text or byte string giving the name (and the path

if the file isn't in the current working directory) of the file to

be opened or an integer file descriptor of the file to be

wrapped. (If a file descriptor is given, it is closed when the

returned I/O object is closed, unless closefd is set to False.)

mode is an optional string that specifies the mode in which the file

is opened. It defaults to 'r' which means open for reading in text

mode.  Other common values are 'w' for writing (truncating the file if

it already exists), 'x' for creating and writing to a new file, and

'a' for appending (which on some Unix systems, means that all writes

append to the end of the file regardless of the current seek position).

In text mode, if encoding is not specified the encoding used is platform

dependent: locale.getencoding() is called to get the current locale encoding.

(For reading and writing raw bytes use binary mode and leave encoding

unspecified.) The available modes are:

========= ===============================================================

Character Meaning

--------- ---------------------------------------------------------------

'r'       open for reading (default)

'w'       open for writing, truncating the file first

'x'       create a new file and open it for writing

'a'       open for writing, appending to the end of the file if it exists

'b'       binary mode

't'       text mode (default)

'+'       open a disk file for updating (reading and writing)

========= ===============================================================

The default mode is 'rt' (open for reading text). For binary random

access, the mode 'w+b' opens and truncates the file to 0 bytes, while

'r+b' opens the file without truncation. The 'x' mode implies 'w' and

raises an `FileExistsError` if the file already exists.

Python distinguishes between files opened in binary and text modes,

even when the underlying operating system doesn't. Files opened in

binary mode (appending 'b' to the mode argument) return contents as

bytes objects without any decoding. In text mode (the default, or when

't' is appended to the mode argument), the contents of the file are

returned as strings, the bytes having been first decoded using a

platform-dependent encoding or using the specified encoding if given.

buffering is an optional integer used to set the buffering policy.

Pass 0 to switch buffering off (only allowed in binary mode), 1 to select

line buffering (only usable in text mode), and an integer > 1 to indicate

the size of a fixed-size chunk buffer.  When no buffering argument is

given, the default buffering policy works as follows:

* Binary files are buffered in fixed-size chunks; the size of the buffer

 is max(min(blocksize, 8 MiB), DEFAULT_BUFFER_SIZE)

 when the device block size is available.

 On most systems, the buffer will typically be 128 kilobytes long.

* "Interactive" text files (files for which isatty() returns True)

  use line buffering.  Other text files use the policy described above

  for binary files.

encoding is the name of the encoding used to decode or encode the

file. This should only be used in text mode. The default encoding is

platform dependent, but any encoding supported by Python can be

passed.  See the codecs module for the list of supported encodings.

errors is an optional string that specifies how encoding errors are to

be handled---this argument should not be used in binary mode. Pass

'strict' to raise a ValueError exception if there is an encoding error

(the default of None has the same effect), or pass 'ignore' to ignore

errors. (Note that ignoring encoding errors can lead to data loss.)

See the documentation for codecs.register or run 'help(codecs.Codec)'

for a list of the permitted encoding error strings.

newline controls how universal newlines works (it only applies to text

mode). It can be None, '', '\n', '\r', and '\r\n'.  It works as

follows:

* On input, if newline is None, universal newlines mode is

  enabled. Lines in the input can end in '\n', '\r', or '\r\n', and

  these are translated into '\n' before being returned to the

  caller. If it is '', universal newline mode is enabled, but line

  endings are returned to the caller untranslated. If it has any of

  the other legal values, input lines are only terminated by the given

  string, and the line ending is returned to the caller untranslated.

* On output, if newline is None, any '\n' characters written are

  translated to the system default line separator, os.linesep. If

  newline is '' or '\n', no translation takes place. If newline is any

  of the other legal values, any '\n' characters written are translated

  to the given string.

If closefd is False, the underlying file descriptor will be kept open

when the file is closed. This does not work when a file name is given

and must be True in that case.

A custom opener can be used by passing a callable as *opener*. The

underlying file descriptor for the file object is then obtained by

calling *opener* with (*file*, *flags*). *opener* must return an open

file descriptor (passing os.open as *opener* results in functionality

similar to passing None).

open() returns a file object whose type depends on the mode, and

through which the standard file operations such as reading and writing

are performed. When open() is used to open a file in a text mode ('w',

'r', 'wt', 'rt', etc.), it returns a TextIOWrapper. When used to open

a file in a binary mode, the returned class varies: in read binary

mode, it returns a BufferedReader; in write binary and append binary

modes, it returns a BufferedWriter, and in read/write mode, it returns

a BufferedRandom.

It is also possible to use a string or bytearray as a file for both

reading and writing. For strings StringIO can be used like a file

opened in a text mode, and for bytes a BytesIO can be used like a file

opened in a binary mode.

[clinic start generated code]*/

static PyObject *

_io_open_impl(PyObject *module, PyObject *file, const char *mode,

              int buffering, const char *encoding, const char *errors,

              const char *newline, int closefd, PyObject *opener)

/*[clinic end generated code: output=aefafc4ce2b46dc0 input=8629579a442a99e3]*/

{

    size_t i;

    int creating = 0, reading = 0, writing = 0, appending = 0, updating = 0;

    int text = 0, binary = 0;

    char rawmode[6], *m;

    int line_buffering, is_number, isatty = 0;

    PyObject *raw, *modeobj = NULL, *buffer, *wrapper, *result = NULL, *path_or_fd = NULL;

    is_number = PyNumber_Check(file);

    if (is_number) {

        path_or_fd = Py_NewRef(file);

    } else {

        path_or_fd = PyOS_FSPath(file);

        if (path_or_fd == NULL) {

            return NULL;

        }

    }

    if (!is_number &&

        !PyUnicode_Check(path_or_fd) &&

        !PyBytes_Check(path_or_fd)) {

        PyErr_Format(PyExc_TypeError, "invalid file: %R", file);

        goto error;

    }

    /* Decode mode */

    for (i = 0; i < strlen(mode); i++) {

        char c = mode[i];

        switch (c) {

        case 'x':

            creating = 1;

            break;

        case 'r':

            reading = 1;

            break;

        case 'w':

            writing = 1;

            break;

        case 'a':

            appending = 1;

            break;

        case '+':

            updating = 1;

            break;

        case 't':

            text = 1;

            break;

        case 'b':

            binary = 1;

            break;

        default:

            goto invalid_mode;

        }

        /* c must not be duplicated */

        if (strchr(mode+i+1, c)) {

          invalid_mode:

            PyErr_Format(PyExc_ValueError, "invalid mode: '%s'", mode);

            goto error;

        }

    }

    m = rawmode;

    if (creating)  *(m++) = 'x';

    if (reading)   *(m++) = 'r';

    if (writing)   *(m++) = 'w';

    if (appending) *(m++) = 'a';

    if (updating)  *(m++) = '+';

    *m = '\0';

    /* Parameters validation */

    if (text && binary) {

        PyErr_SetString(PyExc_ValueError,

                        "can't have text and binary mode at once");

        goto error;

    }

    if (creating + reading + writing + appending > 1) {

        PyErr_SetString(PyExc_ValueError,

                        "must have exactly one of create/read/write/append mode");

        goto error;

    }

    if (binary && encoding != NULL) {

        PyErr_SetString(PyExc_ValueError,

                        "binary mode doesn't take an encoding argument");

        goto error;

    }

    if (binary && errors != NULL) {

        PyErr_SetString(PyExc_ValueError,

                        "binary mode doesn't take an errors argument");

        goto error;

    }

    if (binary && newline != NULL) {

        PyErr_SetString(PyExc_ValueError,

                        "binary mode doesn't take a newline argument");

        goto error;

    }

    if (binary && buffering == 1) {

        if (PyErr_WarnEx(PyExc_RuntimeWarning,

                         "line buffering (buffering=1) isn't supported in "

                         "binary mode, the default buffer size will be used",

                         1) < 0) {

           goto error;

        }

    }

    /* Create the Raw file stream */

    _PyIO_State *state = get_io_state(module);

    {

        PyObject *RawIO_class = (PyObject *)state->PyFileIO_Type;

#ifdef HAVE_WINDOWS_CONSOLE_IO

        const PyConfig *config = _Py_GetConfig();

        if (!config->legacy_windows_stdio && _PyIO_get_console_type(path_or_fd) != '\0') {

            RawIO_class = (PyObject *)state->PyWindowsConsoleIO_Type;

            encoding = "utf-8";

        }

#endif

        raw = PyObject_CallFunction(RawIO_class, "OsOO",

                                    path_or_fd, rawmode,

                                    closefd ? Py_True : Py_False,

                                    opener);

    }

    if (raw == NULL)

        goto error;

    result = raw;

    Py_SETREF(path_or_fd, NULL);

    modeobj = PyUnicode_FromString(mode);

    if (modeobj == NULL)

        goto error;

    /* buffering */

    if (buffering < 0) {

        PyObject *res = PyObject_CallMethodNoArgs(raw, &_Py_ID(_isatty_open_only));

        if (res == NULL)

            goto error;

        isatty = PyObject_IsTrue(res);

        Py_DECREF(res);

        if (isatty < 0)

            goto error;

    }

    if (buffering == 1 || isatty) {

        buffering = -1;

        line_buffering = 1;

    }

    else

        line_buffering = 0;

    if (buffering < 0) {

        PyObject *blksize_obj;

        blksize_obj = PyObject_GetAttr(raw, &_Py_ID(_blksize));

        if (blksize_obj == NULL)

            goto error;

        buffering = PyLong_AsLong(blksize_obj);

        Py_DECREF(blksize_obj);

        if (buffering == -1 && PyErr_Occurred())

            goto error;

        buffering = Py_MAX(Py_MIN(buffering, 8192 * 1024), DEFAULT_BUFFER_SIZE);

    }

    if (buffering < 0) {

        PyErr_SetString(PyExc_ValueError,

                        "invalid buffering size");

        goto error;

    }

    /* if not buffering, returns the raw file object */

    if (buffering == 0) {

        if (!binary) {

            PyErr_SetString(PyExc_ValueError,

                            "can't have unbuffered text I/O");

            goto error;

        }

        Py_DECREF(modeobj);

        return result;

    }

    /* wraps into a buffered file */

    {

        PyObject *Buffered_class;

        if (updating) {

            Buffered_class = (PyObject *)state->PyBufferedRandom_Type;

        }

        else if (creating || writing || appending) {

            Buffered_class = (PyObject *)state->PyBufferedWriter_Type;

        }

        else if (reading) {

            Buffered_class = (PyObject *)state->PyBufferedReader_Type;

        }

        else {

            PyErr_Format(PyExc_ValueError,

                         "unknown mode: '%s'", mode);

            goto error;

        }

        buffer = PyObject_CallFunction(Buffered_class, "Oi", raw, buffering);

    }

    if (buffer == NULL)

        goto error;

    result = buffer;

    Py_DECREF(raw);

    /* if binary, returns the buffered file */

    if (binary) {

        Py_DECREF(modeobj);

        return result;

    }

    /* wraps into a TextIOWrapper */

    wrapper = PyObject_CallFunction((PyObject *)state->PyTextIOWrapper_Type,

                                    "OsssO",

                                    buffer,

                                    encoding, errors, newline,

                                    line_buffering ? Py_True : Py_False);

    if (wrapper == NULL)

        goto error;

    result = wrapper;

    Py_DECREF(buffer);

    if (PyObject_SetAttr(wrapper, &_Py_ID(mode), modeobj) < 0)

        goto error;

    Py_DECREF(modeobj);

    return result;

  error:

    if (result != NULL) {

        PyObject *exc = PyErr_GetRaisedException();

        PyObject *close_result = PyObject_CallMethodNoArgs(result, &_Py_ID(close));

        _PyErr_ChainExceptions1(exc);

        Py_XDECREF(close_result);

        Py_DECREF(result);

    }

    Py_XDECREF(path_or_fd);

    Py_XDECREF(modeobj);

    return NULL;

}

/*[clinic input]

_io.text_encoding

    encoding: object

    stacklevel: int = 2

    /

A helper function to choose the text encoding.

When encoding is not None, this function returns it.

Otherwise, this function returns the default text encoding

(i.e. "locale" or "utf-8" depends on UTF-8 mode).

This function emits an EncodingWarning if encoding is None and

sys.flags.warn_default_encoding is true.

This can be used in APIs with an encoding=None parameter.

However, please consider using encoding="utf-8" for new APIs.

[clinic start generated code]*/

static PyObject *

_io_text_encoding_impl(PyObject *module, PyObject *encoding, int stacklevel)

/*[clinic end generated code: output=91b2cfea6934cc0c input=4999aa8b3d90f3d4]*/

{

    if (encoding == NULL || encoding == Py_None) {

        PyInterpreterState *interp = _PyInterpreterState_GET();

        if (_PyInterpreterState_GetConfig(interp)->warn_default_encoding) {

            if (PyErr_WarnEx(PyExc_EncodingWarning,

                             "'encoding' argument not specified", stacklevel)) {

                return NULL;

            }

        }

        const PyPreConfig *preconfig = &_PyRuntime.preconfig;

        if (preconfig->utf8_mode) {

            _Py_DECLARE_STR(utf_8, "utf-8");

            encoding = &_Py_STR(utf_8);

        }

        else {

            encoding = &_Py_ID(locale);

        }

    }

    return Py_NewRef(encoding);

}

/*[clinic input]

@permit_long_docstring_body

_io.open_code

    path : unicode

Opens the provided file with the intent to import the contents.

This may perform extra validation beyond open(), but is otherwise interchangeable

with calling open(path, 'rb').

[clinic start generated code]*/

static PyObject *

_io_open_code_impl(PyObject *module, PyObject *path)

/*[clinic end generated code: output=2fe4ecbd6f3d6844 input=53d38a37d780d034]*/

{

    return PyFile_OpenCodeObject(path);

}

/*

 * Private helpers for the io module.

 */

Py_off_t

PyNumber_AsOff_t(PyObject *item, PyObject *err)

{

    Py_off_t result;

    PyObject *runerr;

    PyObject *value = _PyNumber_Index(item);

    if (value == NULL)

        return -1;

    /* We're done if PyLong_AsSsize_t() returns without error. */

    result = PyLong_AsOff_t(value);

    if (result != -1 || !(runerr = PyErr_Occurred()))

        goto finish;

    /* Error handling code -- only manage OverflowError differently */

    if (!PyErr_GivenExceptionMatches(runerr, PyExc_OverflowError))

        goto finish;

    PyErr_Clear();

    /* If no error-handling desired then the default clipping

       is sufficient.

     */

    if (!err) {

        assert(PyLong_Check(value));

        if (_PyLong_IsNegative((PyLongObject *)value))

            result = PY_OFF_T_MIN;

        else

            result = PY_OFF_T_MAX;

    }

    else {

        /* Otherwise replace the error with caller's error object. */

        PyErr_Format(err,

                     "cannot fit '%.200s' into an offset-sized integer",

                     Py_TYPE(item)->tp_name);

    }

 finish:

    Py_DECREF(value);

    return result;

}

static int

iomodule_traverse(PyObject *mod, visitproc visit, void *arg) {

    _PyIO_State *state = get_io_state(mod);

    Py_VISIT(state->unsupported_operation);

    Py_VISIT(state->PyIOBase_Type);

    Py_VISIT(state->PyIncrementalNewlineDecoder_Type);

    Py_VISIT(state->PyRawIOBase_Type);

    Py_VISIT(state->PyBufferedIOBase_Type);

    Py_VISIT(state->PyBufferedRWPair_Type);

    Py_VISIT(state->PyBufferedRandom_Type);

    Py_VISIT(state->PyBufferedReader_Type);

    Py_VISIT(state->PyBufferedWriter_Type);

    Py_VISIT(state->PyBytesIOBuffer_Type);

    Py_VISIT(state->PyBytesIO_Type);

    Py_VISIT(state->PyFileIO_Type);

    Py_VISIT(state->PyStringIO_Type);

    Py_VISIT(state->PyTextIOBase_Type);

    Py_VISIT(state->PyTextIOWrapper_Type);

#ifdef HAVE_WINDOWS_CONSOLE_IO

    Py_VISIT(state->PyWindowsConsoleIO_Type);

#endif

    return 0;

}

static int

iomodule_clear(PyObject *mod) {

    _PyIO_State *state = get_io_state(mod);

    Py_CLEAR(state->unsupported_operation);

    Py_CLEAR(state->PyIOBase_Type);

    Py_CLEAR(state->PyIncrementalNewlineDecoder_Type);

    Py_CLEAR(state->PyRawIOBase_Type);

    Py_CLEAR(state->PyBufferedIOBase_Type);

    Py_CLEAR(state->PyBufferedRWPair_Type);

    Py_CLEAR(state->PyBufferedRandom_Type);

    Py_CLEAR(state->PyBufferedReader_Type);

    Py_CLEAR(state->PyBufferedWriter_Type);

    Py_CLEAR(state->PyBytesIOBuffer_Type);

    Py_CLEAR(state->PyBytesIO_Type);

    Py_CLEAR(state->PyFileIO_Type);

    Py_CLEAR(state->PyStringIO_Type);

    Py_CLEAR(state->PyTextIOBase_Type);

    Py_CLEAR(state->PyTextIOWrapper_Type);

#ifdef HAVE_WINDOWS_CONSOLE_IO

    Py_CLEAR(state->PyWindowsConsoleIO_Type);

#endif

    return 0;

}

static void

iomodule_free(void *mod)

{

    (void)iomodule_clear((PyObject *)mod);

}

/*

 * Module definition

 */

#define clinic_state() (get_io_state(module))

#include "clinic/_iomodule.c.h"

#undef clinic_state

static PyMethodDef module_methods[] = {

    _IO_OPEN_METHODDEF

    _IO_TEXT_ENCODING_METHODDEF

    _IO_OPEN_CODE_METHODDEF

    {NULL, NULL}

};

#define ADD_TYPE(module, type, spec, base)                               \

do {                                                                     \

    type = (PyTypeObject *)PyType_FromModuleAndSpec(module, spec,        \

                                                    (PyObject *)base);   \

    if (type == NULL) {                                                  \

        return -1;                                                       \

    }                                                                    \

    if (PyModule_AddType(module, type) < 0) {                            \

        return -1;                                                       \

    }                                                                    \

} while (0)

static int

iomodule_exec(PyObject *m)

{

    _PyIO_State *state = get_io_state(m);

    /* DEFAULT_BUFFER_SIZE */

    if (PyModule_AddIntMacro(m, DEFAULT_BUFFER_SIZE) < 0)

        return -1;

    /* UnsupportedOperation inherits from ValueError and OSError */

    state->unsupported_operation = PyObject_CallFunction(

        (PyObject *)&PyType_Type, "s(OO){}",

        "UnsupportedOperation", PyExc_OSError, PyExc_ValueError);

    if (state->unsupported_operation == NULL)

        return -1;

    if (PyObject_SetAttrString(state->unsupported_operation,

                               "__module__", &_Py_ID(io)) < 0)

    {

        return -1;

    }

    if (PyModule_AddObjectRef(m, "UnsupportedOperation",

                              state->unsupported_operation) < 0)

    {

        return -1;

    }

    /* BlockingIOError, for compatibility */

    if (PyModule_AddObjectRef(m, "BlockingIOError",

                              (PyObject *) PyExc_BlockingIOError) < 0) {

        return -1;

    }

    // Base classes

    ADD_TYPE(m, state->PyIncrementalNewlineDecoder_Type, &_Py_nldecoder_spec, NULL);

    ADD_TYPE(m, state->PyBytesIOBuffer_Type, &_Py_bytesiobuf_spec, NULL);

    ADD_TYPE(m, state->PyIOBase_Type, &_Py_iobase_spec, NULL);

    // PyIOBase_Type subclasses

    ADD_TYPE(m, state->PyTextIOBase_Type, &_Py_textiobase_spec,

             state->PyIOBase_Type);

    ADD_TYPE(m, state->PyBufferedIOBase_Type, &_Py_bufferediobase_spec,

             state->PyIOBase_Type);

    ADD_TYPE(m, state->PyRawIOBase_Type, &_Py_rawiobase_spec,

             state->PyIOBase_Type);

    // PyBufferedIOBase_Type(PyIOBase_Type) subclasses

    ADD_TYPE(m, state->PyBytesIO_Type, &_Py_bytesio_spec, state->PyBufferedIOBase_Type);

    ADD_TYPE(m, state->PyBufferedWriter_Type, &_Py_bufferedwriter_spec,

             state->PyBufferedIOBase_Type);

    ADD_TYPE(m, state->PyBufferedReader_Type, &_Py_bufferedreader_spec,

             state->PyBufferedIOBase_Type);

    ADD_TYPE(m, state->PyBufferedRWPair_Type, &_Py_bufferedrwpair_spec,

             state->PyBufferedIOBase_Type);

    ADD_TYPE(m, state->PyBufferedRandom_Type, &_Py_bufferedrandom_spec,

             state->PyBufferedIOBase_Type);

    // PyRawIOBase_Type(PyIOBase_Type) subclasses

    ADD_TYPE(m, state->PyFileIO_Type, &_Py_fileio_spec, state->PyRawIOBase_Type);

#ifdef HAVE_WINDOWS_CONSOLE_IO

    ADD_TYPE(m, state->PyWindowsConsoleIO_Type, &_Py_winconsoleio_spec,

             state->PyRawIOBase_Type);

#endif

    // PyTextIOBase_Type(PyIOBase_Type) subclasses

    ADD_TYPE(m, state->PyStringIO_Type, &_Py_stringio_spec, state->PyTextIOBase_Type);

    ADD_TYPE(m, state->PyTextIOWrapper_Type, &_Py_textiowrapper_spec,

             state->PyTextIOBase_Type);

#undef ADD_TYPE

    return 0;

}

static struct PyModuleDef_Slot iomodule_slots[] = {

    _Py_ABI_SLOT,

    {Py_mod_exec, iomodule_exec},

    {Py_mod_multiple_interpreters, Py_MOD_PER_INTERPRETER_GIL_SUPPORTED},

    {Py_mod_gil, Py_MOD_GIL_NOT_USED},

    {0, NULL},

};

struct PyModuleDef _PyIO_Module = {

    .m_base = PyModuleDef_HEAD_INIT,

    .m_name = "io",

    .m_doc = module_doc,

    .m_size = sizeof(_PyIO_State),

    .m_methods = module_methods,

    .m_traverse = iomodule_traverse,

    .m_clear = iomodule_clear,

    .m_free = iomodule_free,

    .m_slots = iomodule_slots,

};

PyMODINIT_FUNC

PyInit__io(void)

{

    return PyModuleDef_Init(&_PyIO_Module);

}