Mar 7, 2025 · Jan 19, 2025 · Jan 19, 2025 · Jan 19, 2025 · Jan 19, 2025 · Jan 21, 2025
diff --git a/Lib/_pyio.py b/Lib/_pyio.py
    def read(self, size=None):
        """Read at most size bytes, returned as bytes.

        Only makes one system call, so less data may be returned than requested
        If size is less than 0, read all bytes in the file making
        multiple read calls. See ``FileIO.readall``.

        Attempts to make only one system call, retrying only per
        PEP 475 (EINTR). This means less data may be returned than
        requested.

        In non-blocking mode, returns None if no data is available.
        Return an empty bytes object at EOF.
        """
    def readall(self):
        """Read all data from the file, returned as bytes.

        In non-blocking mode, returns as much as is immediately available,
        or None if no data is available.  Return an empty bytes object at EOF.
        Reads until either there is an error or read() returns size 0
        (indicates EOF). If the file is already at EOF, returns an
        empty bytes object.

        In non-blocking mode, returns as much data as could be read
        before EAGAIN. If no data is available (EAGAIN is returned
        before bytes are read) returns None.
        """
        self._checkClosed()
        self._checkReadable()
diff --git a/Modules/_io/clinic/fileio.c.h b/Modules/_io/clinic/fileio.c.h
diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c

 Read all data from the file, returned as bytes.

 In non-blocking mode, returns as much as is immediately available,
 or None if no data is available.  Return an empty bytes object at EOF.
 Reads until either there is an error or read() returns size 0 (indicates EOF).
 If the file is already at EOF, returns an empty bytes object.

 In non-blocking mode, returns as much data as could be read before EAGAIN. If no
 data is available (EAGAIN is returned before bytes are read) returns None.
 [clinic start generated code]*/

 static PyObject *
 _io_FileIO_readall_impl(fileio *self)
 /*[clinic end generated code: output=faa0292b213b4022 input=dbdc137f55602834]*/
 /*[clinic end generated code: output=faa0292b213b4022 input=1e19849857f5d0a1]*/
 {
    Py_off_t pos, end;
    PyObject *result;

 Read at most size bytes, returned as bytes.

 Only makes one system call, so less data may be returned than requested.
 In non-blocking mode, returns None if no data is available.
 Return an empty bytes object at EOF.
 If size is less than 0, read all bytes in the file making multiple read calls.
 See ``FileIO.readall``.

 Attempts to make only one system call, retrying only per PEP 475 (EINTR). This
 means less data may be returned than requested.

 In non-blocking mode, returns None if no data is available. Return an empty
 bytes object at EOF.
 [clinic start generated code]*/

 static PyObject *
 _io_FileIO_read_impl(fileio *self, PyTypeObject *cls, Py_ssize_t size)
 /*[clinic end generated code: output=bbd749c7c224143e input=f613d2057e4a1918]*/
 /*[clinic end generated code: output=bbd749c7c224143e input=cf21fddef7d38ab6]*/
 {
    char *ptr;
    Py_ssize_t n;
Original file line number	Diff line number	Diff line change
Expand Up		@@ -1645,7 +1645,13 @@ def _checkWritable(self, msg=None):
		def read(self, size=None):
		"""Read at most size bytes, returned as bytes.

		Only makes one system call, so less data may be returned than requested
		If size is less than 0, read all bytes in the file making
		multiple read calls. See ``FileIO.readall``.

		Attempts to make only one system call, retrying only per
		PEP 475 (EINTR). This means less data may be returned than
		requested.

		In non-blocking mode, returns None if no data is available.
		Return an empty bytes object at EOF.
		"""
Expand All		@@ -1661,8 +1667,13 @@ def read(self, size=None):
		def readall(self):
		"""Read all data from the file, returned as bytes.

		In non-blocking mode, returns as much as is immediately available,
		or None if no data is available. Return an empty bytes object at EOF.
		Reads until either there is an error or read() returns size 0
		(indicates EOF). If the file is already at EOF, returns an
		empty bytes object.

		In non-blocking mode, returns as much data as could be read
		before EAGAIN. If no data is available (EAGAIN is returned
		before bytes are read) returns None.
		"""
		self._checkClosed()
		self._checkReadable()
Expand Down
Original file line number	Diff line number	Diff line change
Expand Up		@@ -727,13 +727,16 @@ _io.FileIO.readall

		Read all data from the file, returned as bytes.

		In non-blocking mode, returns as much as is immediately available,
		or None if no data is available. Return an empty bytes object at EOF.
		Reads until either there is an error or read() returns size 0 (indicates EOF).
		If the file is already at EOF, returns an empty bytes object.

		In non-blocking mode, returns as much data as could be read before EAGAIN. If no
		data is available (EAGAIN is returned before bytes are read) returns None.
		[clinic start generated code]*/

		static PyObject *
		_io_FileIO_readall_impl(fileio *self)
		/[clinic end generated code: output=faa0292b213b4022 input=dbdc137f55602834]/
		/[clinic end generated code: output=faa0292b213b4022 input=1e19849857f5d0a1]/
		{
		Py_off_t pos, end;
		PyObject *result;
Expand DownExpand Up		@@ -848,14 +851,19 @@ _io.FileIO.read

		Read at most size bytes, returned as bytes.

		Only makes one system call, so less data may be returned than requested.
		In non-blocking mode, returns None if no data is available.
		Return an empty bytes object at EOF.
		If size is less than 0, read all bytes in the file making multiple read calls.
		See ``FileIO.readall``.

		Attempts to make only one system call, retrying only per PEP 475 (EINTR). This
		means less data may be returned than requested.

		In non-blocking mode, returns None if no data is available. Return an empty
		bytes object at EOF.
		[clinic start generated code]*/

		static PyObject *
		_io_FileIO_read_impl(fileio self, PyTypeObject cls, Py_ssize_t size)
		/[clinic end generated code: output=bbd749c7c224143e input=f613d2057e4a1918]/
		/[clinic end generated code: output=bbd749c7c224143e input=cf21fddef7d38ab6]/
		{
		char *ptr;
		Py_ssize_t n;
Expand Down