Issue 5682: Move _io module into its own subdirectory.

Reviewed by: Antoine Pitrou

1 files changed, 1034 insertions, 0 deletions

diff --git a/Modules/_io/fileio.c b/Modules/_io/fileio.c
new file mode 100644
index 0000000..c0f5c90
--- /dev/null
+++ b/Modules/_io/fileio.c
@@ -0,0 +1,1034 @@
+/* Author: Daniel Stutzbach */
+
+#define PY_SSIZE_T_CLEAN
+#include "Python.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <stddef.h> /* For offsetof */
+#include "_iomodule.h"
+
+/*
+ * Known likely problems:
+ *
+ * - Files larger then 2**32-1
+ * - Files with unicode filenames
+ * - Passing numbers greater than 2**32-1 when an integer is expected
+ * - Making it work on Windows and other oddball platforms
+ *
+ * To Do:
+ *
+ * - autoconfify header file inclusion
+ */
+
+#ifdef MS_WINDOWS
+/* can simulate truncate with Win32 API functions; see file_truncate */
+#define HAVE_FTRUNCATE
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#endif
+
+#if BUFSIZ < (8*1024)
+#define SMALLCHUNK (8*1024)
+#elif (BUFSIZ >= (2 << 25))
+#error "unreasonable BUFSIZ > 64MB defined"
+#else
+#define SMALLCHUNK BUFSIZ
+#endif
+
+#if SIZEOF_INT < 4
+#define BIGCHUNK  (512 * 32)
+#else
+#define BIGCHUNK  (512 * 1024)
+#endif
+
+typedef struct {
+	PyObject_HEAD
+	int fd;
+	unsigned readable : 1;
+	unsigned writable : 1;
+	int seekable : 2; /* -1 means unknown */
+	int closefd : 1;
+	PyObject *weakreflist;
+	PyObject *dict;
+} PyFileIOObject;
+
+PyTypeObject PyFileIO_Type;
+
+#define PyFileIO_Check(op) (PyObject_TypeCheck((op), &PyFileIO_Type))
+
+int
+_PyFileIO_closed(PyObject *self)
+{
+	return ((PyFileIOObject *)self)->fd < 0;
+}
+
+static PyObject *
+portable_lseek(int fd, PyObject *posobj, int whence);
+
+static PyObject *portable_lseek(int fd, PyObject *posobj, int whence);
+
+/* Returns 0 on success, -1 with exception set on failure. */
+static int
+internal_close(PyFileIOObject *self)
+{
+	int err = 0;
+	int save_errno = 0;
+	if (self->fd >= 0) {
+		int fd = self->fd;
+		self->fd = -1;
+		/* fd is accessible and someone else may have closed it */
+		if (_PyVerify_fd(fd)) {
+			Py_BEGIN_ALLOW_THREADS
+			err = close(fd);
+			if (err < 0)
+				save_errno = errno;
+			Py_END_ALLOW_THREADS
+		} else {
+			save_errno = errno;
+			err = -1;
+		}
+	}
+	if (err < 0) {
+		errno = save_errno;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return -1;
+	}
+	return 0;
+}
+
+static PyObject *
+fileio_close(PyFileIOObject *self)
+{
+	if (!self->closefd) {
+		self->fd = -1;
+		Py_RETURN_NONE;
+	}
+	errno = internal_close(self);
+	if (errno < 0)
+		return NULL;
+
+	return PyObject_CallMethod((PyObject*)&PyRawIOBase_Type,
+				   "close", "O", self);
+}
+
+static PyObject *
+fileio_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
+{
+	PyFileIOObject *self;
+
+	assert(type != NULL && type->tp_alloc != NULL);
+
+	self = (PyFileIOObject *) type->tp_alloc(type, 0);
+	if (self != NULL) {
+		self->fd = -1;
+		self->readable = 0;
+		self->writable = 0;
+		self->seekable = -1;
+		self->closefd = 1;
+		self->weakreflist = NULL;
+	}
+
+	return (PyObject *) self;
+}
+
+/* On Unix, open will succeed for directories.
+   In Python, there should be no file objects referring to
+   directories, so we need a check.  */
+
+static int
+dircheck(PyFileIOObject* self, const char *name)
+{
+#if defined(HAVE_FSTAT) && defined(S_IFDIR) && defined(EISDIR)
+	struct stat buf;
+	if (self->fd < 0)
+		return 0;
+	if (fstat(self->fd, &buf) == 0 && S_ISDIR(buf.st_mode)) {
+		char *msg = strerror(EISDIR);
+		PyObject *exc;
+		if (internal_close(self))
+			return -1;
+
+		exc = PyObject_CallFunction(PyExc_IOError, "(iss)",
+					    EISDIR, msg, name);
+		PyErr_SetObject(PyExc_IOError, exc);
+		Py_XDECREF(exc);
+		return -1;
+	}
+#endif
+	return 0;
+}
+
+static int
+check_fd(int fd)
+{
+#if defined(HAVE_FSTAT)
+	struct stat buf;
+	if (!_PyVerify_fd(fd) || (fstat(fd, &buf) < 0 && errno == EBADF)) {
+		PyObject *exc;
+		char *msg = strerror(EBADF);
+		exc = PyObject_CallFunction(PyExc_OSError, "(is)",
+					    EBADF, msg);
+		PyErr_SetObject(PyExc_OSError, exc);
+		Py_XDECREF(exc);
+		return -1;
+	}
+#endif
+	return 0;
+}
+
+
+static int
+fileio_init(PyObject *oself, PyObject *args, PyObject *kwds)
+{
+	PyFileIOObject *self = (PyFileIOObject *) oself;
+	static char *kwlist[] = {"file", "mode", "closefd", NULL};
+	const char *name = NULL;
+	PyObject *nameobj, *stringobj = NULL;
+	char *mode = "r";
+	char *s;
+#ifdef MS_WINDOWS
+	Py_UNICODE *widename = NULL;
+#endif
+	int ret = 0;
+	int rwa = 0, plus = 0, append = 0;
+	int flags = 0;
+	int fd = -1;
+	int closefd = 1;
+
+	assert(PyFileIO_Check(oself));
+	if (self->fd >= 0) {
+		/* Have to close the existing file first. */
+		if (internal_close(self) < 0)
+			return -1;
+	}
+
+	if (!PyArg_ParseTupleAndKeywords(args, kwds, "O|si:fileio",
+					 kwlist, &nameobj, &mode, &closefd))
+		return -1;
+
+	if (PyFloat_Check(nameobj)) {
+		PyErr_SetString(PyExc_TypeError,
+				"integer argument expected, got float");
+		return -1;
+	}
+
+	fd = PyLong_AsLong(nameobj);
+	if (fd < 0) {
+		if (!PyErr_Occurred()) {
+			PyErr_SetString(PyExc_ValueError,
+					"Negative filedescriptor");
+			return -1;
+		}
+		PyErr_Clear();
+	}
+
+#ifdef Py_WIN_WIDE_FILENAMES
+	if (GetVersion() < 0x80000000) {
+		/* On NT, so wide API available */
+		if (PyUnicode_Check(nameobj))
+			widename = PyUnicode_AS_UNICODE(nameobj);
+	}
+	if (widename == NULL)
+#endif
+	if (fd < 0)
+	{
+		if (PyBytes_Check(nameobj) || PyByteArray_Check(nameobj)) {
+			Py_ssize_t namelen;
+			if (PyObject_AsCharBuffer(nameobj, &name, &namelen) < 0)
+				return -1;
+		}
+		else {
+			PyObject *u = PyUnicode_FromObject(nameobj);
+
+			if (u == NULL)
+				return -1;
+
+			stringobj = PyUnicode_AsEncodedString(
+				u, Py_FileSystemDefaultEncoding, NULL);
+			Py_DECREF(u);
+			if (stringobj == NULL)
+				return -1;
+			if (!PyBytes_Check(stringobj)) {
+				PyErr_SetString(PyExc_TypeError,
+						"encoder failed to return bytes");
+				goto error;
+			}
+			name = PyBytes_AS_STRING(stringobj);
+		}
+	}
+
+	s = mode;
+	while (*s) {
+		switch (*s++) {
+		case 'r':
+			if (rwa) {
+			bad_mode:
+				PyErr_SetString(PyExc_ValueError,
+						"Must have exactly one of read/write/append mode");
+				goto error;
+			}
+			rwa = 1;
+			self->readable = 1;
+			break;
+		case 'w':
+			if (rwa)
+				goto bad_mode;
+			rwa = 1;
+			self->writable = 1;
+			flags |= O_CREAT | O_TRUNC;
+			break;
+		case 'a':
+			if (rwa)
+				goto bad_mode;
+			rwa = 1;
+			self->writable = 1;
+			flags |= O_CREAT;
+			append = 1;
+			break;
+		case 'b':
+			break;
+		case '+':
+			if (plus)
+				goto bad_mode;
+			self->readable = self->writable = 1;
+			plus = 1;
+			break;
+		default:
+			PyErr_Format(PyExc_ValueError,
+				     "invalid mode: %.200s", mode);
+			goto error;
+		}
+	}
+
+	if (!rwa)
+		goto bad_mode;
+
+	if (self->readable && self->writable)
+		flags |= O_RDWR;
+	else if (self->readable)
+		flags |= O_RDONLY;
+	else
+		flags |= O_WRONLY;
+
+#ifdef O_BINARY
+	flags |= O_BINARY;
+#endif
+
+#ifdef O_APPEND
+	if (append)
+		flags |= O_APPEND;
+#endif
+
+	if (fd >= 0) {
+		if (check_fd(fd))
+			goto error;
+		self->fd = fd;
+		self->closefd = closefd;
+	}
+	else {
+		self->closefd = 1;
+		if (!closefd) {
+			PyErr_SetString(PyExc_ValueError,
+                            "Cannot use closefd=False with file name");
+			goto error;
+		}
+
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+#ifdef MS_WINDOWS
+		if (widename != NULL)
+			self->fd = _wopen(widename, flags, 0666);
+		else
+#endif
+			self->fd = open(name, flags, 0666);
+		Py_END_ALLOW_THREADS
+		if (self->fd < 0) {
+#ifdef MS_WINDOWS
+			if (widename != NULL)
+				PyErr_SetFromErrnoWithUnicodeFilename(PyExc_IOError, widename);
+			else
+#endif
+				PyErr_SetFromErrnoWithFilename(PyExc_IOError, name);
+			goto error;
+		}
+		if(dircheck(self, name) < 0)
+			goto error;
+	}
+
+	if (PyObject_SetAttrString((PyObject *)self, "name", nameobj) < 0)
+		goto error;
+
+	if (append) {
+		/* For consistent behaviour, we explicitly seek to the
+		   end of file (otherwise, it might be done only on the
+		   first write()). */
+		PyObject *pos = portable_lseek(self->fd, NULL, 2);
+		if (pos == NULL)
+			goto error;
+		Py_DECREF(pos);
+	}
+
+	goto done;
+
+ error:
+	ret = -1;
+
+ done:
+	Py_CLEAR(stringobj);
+	return ret;
+}
+
+static int
+fileio_traverse(PyFileIOObject *self, visitproc visit, void *arg)
+{
+	Py_VISIT(self->dict);
+	return 0;
+}
+
+static int
+fileio_clear(PyFileIOObject *self)
+{
+	Py_CLEAR(self->dict);
+	return 0;
+}
+
+static void
+fileio_dealloc(PyFileIOObject *self)
+{
+	if (_PyIOBase_finalize((PyObject *) self) < 0)
+		return;
+	_PyObject_GC_UNTRACK(self);
+	if (self->weakreflist != NULL)
+		PyObject_ClearWeakRefs((PyObject *) self);
+	Py_CLEAR(self->dict);
+	Py_TYPE(self)->tp_free((PyObject *)self);
+}
+
+static PyObject *
+err_closed(void)
+{
+	PyErr_SetString(PyExc_ValueError, "I/O operation on closed file");
+	return NULL;
+}
+
+static PyObject *
+err_mode(char *action)
+{
+	PyErr_Format(PyExc_ValueError, "File not open for %s", action);
+	return NULL;
+}
+
+static PyObject *
+fileio_fileno(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyLong_FromLong((long) self->fd);
+}
+
+static PyObject *
+fileio_readable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyBool_FromLong((long) self->readable);
+}
+
+static PyObject *
+fileio_writable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	return PyBool_FromLong((long) self->writable);
+}
+
+static PyObject *
+fileio_seekable(PyFileIOObject *self)
+{
+	if (self->fd < 0)
+		return err_closed();
+	if (self->seekable < 0) {
+		PyObject *pos = portable_lseek(self->fd, NULL, SEEK_CUR);
+		if (pos == NULL) {
+			PyErr_Clear();
+			self->seekable = 0;
+		} else {
+			Py_DECREF(pos);
+			self->seekable = 1;
+		}
+	}
+	return PyBool_FromLong((long) self->seekable);
+}
+
+static PyObject *
+fileio_readinto(PyFileIOObject *self, PyObject *args)
+{
+	Py_buffer pbuf;
+	Py_ssize_t n;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->readable)
+		return err_mode("reading");
+
+	if (!PyArg_ParseTuple(args, "w*", &pbuf))
+		return NULL;
+
+	if (_PyVerify_fd(self->fd)) {
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		n = read(self->fd, pbuf.buf, pbuf.len);
+		Py_END_ALLOW_THREADS
+	} else
+		n = -1;
+	PyBuffer_Release(&pbuf);
+	if (n < 0) {
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return PyLong_FromSsize_t(n);
+}
+
+static size_t
+new_buffersize(PyFileIOObject *self, size_t currentsize)
+{
+#ifdef HAVE_FSTAT
+	off_t pos, end;
+	struct stat st;
+	if (fstat(self->fd, &st) == 0) {
+		end = st.st_size;
+		pos = lseek(self->fd, 0L, SEEK_CUR);
+		/* Files claiming a size smaller than SMALLCHUNK may
+		   actually be streaming pseudo-files. In this case, we
+		   apply the more aggressive algorithm below.
+		*/
+		if (end >= SMALLCHUNK && end >= pos && pos >= 0) {
+			/* Add 1 so if the file were to grow we'd notice. */
+			return currentsize + end - pos + 1;
+		}
+	}
+#endif
+	if (currentsize > SMALLCHUNK) {
+		/* Keep doubling until we reach BIGCHUNK;
+		   then keep adding BIGCHUNK. */
+		if (currentsize <= BIGCHUNK)
+			return currentsize + currentsize;
+		else
+			return currentsize + BIGCHUNK;
+	}
+	return currentsize + SMALLCHUNK;
+}
+
+static PyObject *
+fileio_readall(PyFileIOObject *self)
+{
+	PyObject *result;
+	Py_ssize_t total = 0;
+	int n;
+
+	if (!_PyVerify_fd(self->fd))
+		return PyErr_SetFromErrno(PyExc_IOError);
+
+	result = PyBytes_FromStringAndSize(NULL, SMALLCHUNK);
+	if (result == NULL)
+		return NULL;
+
+	while (1) {
+		size_t newsize = new_buffersize(self, total);
+		if (newsize > PY_SSIZE_T_MAX || newsize <= 0) {
+			PyErr_SetString(PyExc_OverflowError,
+				"unbounded read returned more bytes "
+				"than a Python string can hold ");
+			Py_DECREF(result);
+			return NULL;
+		}
+
+		if (PyBytes_GET_SIZE(result) < newsize) {
+			if (_PyBytes_Resize(&result, newsize) < 0) {
+				if (total == 0) {
+					Py_DECREF(result);
+					return NULL;
+				}
+				PyErr_Clear();
+				break;
+			}
+		}
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		n = read(self->fd,
+			 PyBytes_AS_STRING(result) + total,
+			 newsize - total);
+		Py_END_ALLOW_THREADS
+		if (n == 0)
+			break;
+		if (n < 0) {
+			if (total > 0)
+				break;
+			if (errno == EAGAIN) {
+				Py_DECREF(result);
+				Py_RETURN_NONE;
+			}
+			Py_DECREF(result);
+			PyErr_SetFromErrno(PyExc_IOError);
+			return NULL;
+		}
+		total += n;
+	}
+
+	if (PyBytes_GET_SIZE(result) > total) {
+		if (_PyBytes_Resize(&result, total) < 0) {
+			/* This should never happen, but just in case */
+			Py_DECREF(result);
+			return NULL;
+		}
+	}
+	return result;
+}
+
+static PyObject *
+fileio_read(PyFileIOObject *self, PyObject *args)
+{
+	char *ptr;
+	Py_ssize_t n;
+	Py_ssize_t size = -1;
+	PyObject *bytes;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->readable)
+		return err_mode("reading");
+
+	if (!PyArg_ParseTuple(args, "|n", &size))
+		return NULL;
+
+        if (size < 0) {
+		return fileio_readall(self);
+	}
+
+	bytes = PyBytes_FromStringAndSize(NULL, size);
+	if (bytes == NULL)
+		return NULL;
+	ptr = PyBytes_AS_STRING(bytes);
+
+	if (_PyVerify_fd(self->fd)) {
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		n = read(self->fd, ptr, size);
+		Py_END_ALLOW_THREADS
+	} else
+		n = -1;
+
+	if (n < 0) {
+		Py_DECREF(bytes);
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	if (n != size) {
+		if (_PyBytes_Resize(&bytes, n) < 0) {
+			Py_DECREF(bytes);
+			return NULL;
+		}
+	}
+
+	return (PyObject *) bytes;
+}
+
+static PyObject *
+fileio_write(PyFileIOObject *self, PyObject *args)
+{
+	Py_buffer pbuf;
+	Py_ssize_t n;
+
+	if (self->fd < 0)
+		return err_closed();
+	if (!self->writable)
+		return err_mode("writing");
+
+	if (!PyArg_ParseTuple(args, "s*", &pbuf))
+		return NULL;
+
+	if (_PyVerify_fd(self->fd)) {
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		n = write(self->fd, pbuf.buf, pbuf.len);
+		Py_END_ALLOW_THREADS
+	} else
+		n = -1;
+
+	PyBuffer_Release(&pbuf);
+
+	if (n < 0) {
+		if (errno == EAGAIN)
+			Py_RETURN_NONE;
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return PyLong_FromSsize_t(n);
+}
+
+/* XXX Windows support below is likely incomplete */
+
+/* Cribbed from posix_lseek() */
+static PyObject *
+portable_lseek(int fd, PyObject *posobj, int whence)
+{
+	Py_off_t pos, res;
+
+#ifdef SEEK_SET
+	/* Turn 0, 1, 2 into SEEK_{SET,CUR,END} */
+	switch (whence) {
+#if SEEK_SET != 0
+	case 0: whence = SEEK_SET; break;
+#endif
+#if SEEK_CUR != 1
+	case 1: whence = SEEK_CUR; break;
+#endif
+#if SEEK_END != 2
+	case 2: whence = SEEK_END; break;
+#endif
+	}
+#endif /* SEEK_SET */
+
+	if (posobj == NULL)
+		pos = 0;
+	else {
+		if(PyFloat_Check(posobj)) {
+			PyErr_SetString(PyExc_TypeError, "an integer is required");
+			return NULL;
+		}
+#if defined(HAVE_LARGEFILE_SUPPORT)
+		pos = PyLong_AsLongLong(posobj);
+#else
+		pos = PyLong_AsLong(posobj);
+#endif
+		if (PyErr_Occurred())
+			return NULL;
+	}
+
+	if (_PyVerify_fd(fd)) {
+		Py_BEGIN_ALLOW_THREADS
+#if defined(MS_WIN64) || defined(MS_WINDOWS)
+		res = _lseeki64(fd, pos, whence);
+#else
+		res = lseek(fd, pos, whence);
+#endif
+		Py_END_ALLOW_THREADS
+	} else
+		res = -1;
+	if (res < 0)
+		return PyErr_SetFromErrno(PyExc_IOError);
+
+#if defined(HAVE_LARGEFILE_SUPPORT)
+	return PyLong_FromLongLong(res);
+#else
+	return PyLong_FromLong(res);
+#endif
+}
+
+static PyObject *
+fileio_seek(PyFileIOObject *self, PyObject *args)
+{
+	PyObject *posobj;
+	int whence = 0;
+
+	if (self->fd < 0)
+		return err_closed();
+
+	if (!PyArg_ParseTuple(args, "O|i", &posobj, &whence))
+		return NULL;
+
+	return portable_lseek(self->fd, posobj, whence);
+}
+
+static PyObject *
+fileio_tell(PyFileIOObject *self, PyObject *args)
+{
+	if (self->fd < 0)
+		return err_closed();
+
+	return portable_lseek(self->fd, NULL, 1);
+}
+
+#ifdef HAVE_FTRUNCATE
+static PyObject *
+fileio_truncate(PyFileIOObject *self, PyObject *args)
+{
+	PyObject *posobj = NULL;
+	Py_off_t pos;
+	int ret;
+	int fd;
+
+	fd = self->fd;
+	if (fd < 0)
+		return err_closed();
+	if (!self->writable)
+		return err_mode("writing");
+
+	if (!PyArg_ParseTuple(args, "|O", &posobj))
+		return NULL;
+
+	if (posobj == Py_None || posobj == NULL) {
+		/* Get the current position. */
+                posobj = portable_lseek(fd, NULL, 1);
+                if (posobj == NULL)
+			return NULL;
+        }
+        else {
+		/* Move to the position to be truncated. */
+                posobj = portable_lseek(fd, posobj, 0);
+        }
+	if (posobj == NULL)
+		return NULL;
+
+#if defined(HAVE_LARGEFILE_SUPPORT)
+	pos = PyLong_AsLongLong(posobj);
+#else
+	pos = PyLong_AsLong(posobj);
+#endif
+	if (pos == -1 && PyErr_Occurred())
+		return NULL;
+
+#ifdef MS_WINDOWS
+	/* MS _chsize doesn't work if newsize doesn't fit in 32 bits,
+	   so don't even try using it. */
+	{
+		HANDLE hFile;
+
+		/* Truncate.  Note that this may grow the file! */
+		Py_BEGIN_ALLOW_THREADS
+		errno = 0;
+		hFile = (HANDLE)_get_osfhandle(fd);
+		ret = hFile == (HANDLE)-1;
+		if (ret == 0) {
+			ret = SetEndOfFile(hFile) == 0;
+			if (ret)
+				errno = EACCES;
+		}
+		Py_END_ALLOW_THREADS
+	}
+#else
+	Py_BEGIN_ALLOW_THREADS
+	errno = 0;
+	ret = ftruncate(fd, pos);
+	Py_END_ALLOW_THREADS
+#endif /* !MS_WINDOWS */
+
+	if (ret != 0) {
+		PyErr_SetFromErrno(PyExc_IOError);
+		return NULL;
+	}
+
+	return posobj;
+}
+#endif
+
+static char *
+mode_string(PyFileIOObject *self)
+{
+	if (self->readable) {
+		if (self->writable)
+			return "rb+";
+		else
+			return "rb";
+	}
+	else
+		return "wb";
+}
+
+static PyObject *
+fileio_repr(PyFileIOObject *self)
+{
+        if (self->fd < 0)
+		return PyUnicode_FromFormat("io.FileIO(-1)");
+
+	return PyUnicode_FromFormat("io.FileIO(%d, '%s')",
+				   self->fd, mode_string(self));
+}
+
+static PyObject *
+fileio_isatty(PyFileIOObject *self)
+{
+	long res;
+
+	if (self->fd < 0)
+		return err_closed();
+	Py_BEGIN_ALLOW_THREADS
+	res = isatty(self->fd);
+	Py_END_ALLOW_THREADS
+	return PyBool_FromLong(res);
+}
+
+
+PyDoc_STRVAR(fileio_doc,
+"file(name: str[, mode: str]) -> file IO object\n"
+"\n"
+"Open a file.  The mode can be 'r', 'w' or 'a' for reading (default),\n"
+"writing or appending.	The file will be created if it doesn't exist\n"
+"when opened for writing or appending; it will be truncated when\n"
+"opened for writing.  Add a '+' to the mode to allow simultaneous\n"
+"reading and writing.");
+
+PyDoc_STRVAR(read_doc,
+"read(size: int) -> bytes.  read at most size bytes, returned as bytes.\n"
+"\n"
+"Only makes one system call, so less data may be returned than requested\n"
+"In non-blocking mode, returns None if no data is available.\n"
+"On end-of-file, returns ''.");
+
+PyDoc_STRVAR(readall_doc,
+"readall() -> bytes.  read all data from the file, returned as bytes.\n"
+"\n"
+"In non-blocking mode, returns as much as is immediately available,\n"
+"or None if no data is available.  On end-of-file, returns ''.");
+
+PyDoc_STRVAR(write_doc,
+"write(b: bytes) -> int.  Write bytes b to file, return number written.\n"
+"\n"
+"Only makes one system call, so not all of the data may be written.\n"
+"The number of bytes actually written is returned.");
+
+PyDoc_STRVAR(fileno_doc,
+"fileno() -> int. \"file descriptor\".\n"
+"\n"
+"This is needed for lower-level file interfaces, such the fcntl module.");
+
+PyDoc_STRVAR(seek_doc,
+"seek(offset: int[, whence: int]) -> None.  Move to new file position.\n"
+"\n"
+"Argument offset is a byte count.  Optional argument whence defaults to\n"
+"0 (offset from start of file, offset should be >= 0); other values are 1\n"
+"(move relative to current position, positive or negative), and 2 (move\n"
+"relative to end of file, usually negative, although many platforms allow\n"
+"seeking beyond the end of a file)."
+"\n"
+"Note that not all file objects are seekable.");
+
+#ifdef HAVE_FTRUNCATE
+PyDoc_STRVAR(truncate_doc,
+"truncate([size: int]) -> None.	 Truncate the file to at most size bytes.\n"
+"\n"
+"Size defaults to the current file position, as returned by tell()."
+"The current file position is changed to the value of size.");
+#endif
+
+PyDoc_STRVAR(tell_doc,
+"tell() -> int.	 Current file position");
+
+PyDoc_STRVAR(readinto_doc,
+"readinto() -> Same as RawIOBase.readinto().");
+
+PyDoc_STRVAR(close_doc,
+"close() -> None.  Close the file.\n"
+"\n"
+"A closed file cannot be used for further I/O operations.  close() may be\n"
+"called more than once without error.  Changes the fileno to -1.");
+
+PyDoc_STRVAR(isatty_doc,
+"isatty() -> bool.  True if the file is connected to a tty device.");
+
+PyDoc_STRVAR(seekable_doc,
+"seekable() -> bool.  True if file supports random-access.");
+
+PyDoc_STRVAR(readable_doc,
+"readable() -> bool.  True if file was opened in a read mode.");
+
+PyDoc_STRVAR(writable_doc,
+"writable() -> bool.  True if file was opened in a write mode.");
+
+static PyMethodDef fileio_methods[] = {
+	{"read",     (PyCFunction)fileio_read,	   METH_VARARGS, read_doc},
+	{"readall",  (PyCFunction)fileio_readall,  METH_NOARGS,  readall_doc},
+	{"readinto", (PyCFunction)fileio_readinto, METH_VARARGS, readinto_doc},
+	{"write",    (PyCFunction)fileio_write,	   METH_VARARGS, write_doc},
+	{"seek",     (PyCFunction)fileio_seek,	   METH_VARARGS, seek_doc},
+	{"tell",     (PyCFunction)fileio_tell,	   METH_VARARGS, tell_doc},
+#ifdef HAVE_FTRUNCATE
+	{"truncate", (PyCFunction)fileio_truncate, METH_VARARGS, truncate_doc},
+#endif
+	{"close",    (PyCFunction)fileio_close,	   METH_NOARGS,	 close_doc},
+	{"seekable", (PyCFunction)fileio_seekable, METH_NOARGS,	 seekable_doc},
+	{"readable", (PyCFunction)fileio_readable, METH_NOARGS,	 readable_doc},
+	{"writable", (PyCFunction)fileio_writable, METH_NOARGS,	 writable_doc},
+	{"fileno",   (PyCFunction)fileio_fileno,   METH_NOARGS,	 fileno_doc},
+	{"isatty",   (PyCFunction)fileio_isatty,   METH_NOARGS,	 isatty_doc},
+	{NULL,	     NULL}	       /* sentinel */
+};
+
+/* 'closed' and 'mode' are attributes for backwards compatibility reasons. */
+
+static PyObject *
+get_closed(PyFileIOObject *self, void *closure)
+{
+	return PyBool_FromLong((long)(self->fd < 0));
+}
+
+static PyObject *
+get_closefd(PyFileIOObject *self, void *closure)
+{
+	return PyBool_FromLong((long)(self->closefd));
+}
+
+static PyObject *
+get_mode(PyFileIOObject *self, void *closure)
+{
+	return PyUnicode_FromString(mode_string(self));
+}
+
+static PyGetSetDef fileio_getsetlist[] = {
+	{"closed", (getter)get_closed, NULL, "True if the file is closed"},
+	{"closefd", (getter)get_closefd, NULL, 
+		"True if the file descriptor will be closed"},
+	{"mode", (getter)get_mode, NULL, "String giving the file mode"},
+	{0},
+};
+
+PyTypeObject PyFileIO_Type = {
+	PyVarObject_HEAD_INIT(NULL, 0)
+	"_io.FileIO",
+	sizeof(PyFileIOObject),
+	0,
+	(destructor)fileio_dealloc,		/* tp_dealloc */
+	0,					/* tp_print */
+	0,					/* tp_getattr */
+	0,					/* tp_setattr */
+	0,					/* tp_reserved */
+	(reprfunc)fileio_repr,			/* tp_repr */
+	0,					/* tp_as_number */
+	0,					/* tp_as_sequence */
+	0,					/* tp_as_mapping */
+	0,					/* tp_hash */
+	0,					/* tp_call */
+	0,					/* tp_str */
+	PyObject_GenericGetAttr,		/* tp_getattro */
+	0,					/* tp_setattro */
+	0,					/* tp_as_buffer */
+	Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE
+			| Py_TPFLAGS_HAVE_GC,	/* tp_flags */
+	fileio_doc,				/* tp_doc */
+	(traverseproc)fileio_traverse,		/* tp_traverse */
+	(inquiry)fileio_clear,			/* tp_clear */
+	0,					/* tp_richcompare */
+	offsetof(PyFileIOObject, weakreflist),	/* tp_weaklistoffset */
+	0,					/* tp_iter */
+	0,					/* tp_iternext */
+	fileio_methods,				/* tp_methods */
+	0,					/* tp_members */
+	fileio_getsetlist,			/* tp_getset */
+	0,					/* tp_base */
+	0,					/* tp_dict */
+	0,					/* tp_descr_get */
+	0,					/* tp_descr_set */
+	offsetof(PyFileIOObject, dict),         /* tp_dictoffset */
+	fileio_init,				/* tp_init */
+	PyType_GenericAlloc,			/* tp_alloc */
+	fileio_new,				/* tp_new */
+	PyObject_GC_Del,			/* tp_free */
+};