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2773 lines (2416 loc) · 77.1 KB
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/*
An implementation of Buffered I/O as defined by PEP 3116 - "New I/O"
Classes defined here: BufferedIOBase, BufferedReader, BufferedWriter,
BufferedRandom.
Written by Amaury Forgeot d'Arc and Antoine Pitrou
*/
#include "Python.h"
#include "pycore_call.h" // _PyObject_CallNoArgs()
#include "pycore_object.h" // _PyObject_GC_UNTRACK()
#include "pycore_pyerrors.h" // _Py_FatalErrorFormat()
#include "pycore_pylifecycle.h" // _Py_IsInterpreterFinalizing()
#include "_iomodule.h"
/*[clinic input]
module _io
class _io._BufferedIOBase "PyObject *" "clinic_state()->PyBufferedIOBase_Type"
class _io._Buffered "buffered *" "clinic_state()->PyBufferedIOBase_Type"
class _io.BufferedReader "buffered *" "clinic_state()->PyBufferedReader_Type"
class _io.BufferedWriter "buffered *" "clinic_state()->PyBufferedWriter_Type"
class _io.BufferedRWPair "rwpair *" "clinic_state()->PyBufferedRWPair_Type"
class _io.BufferedRandom "buffered *" "clinic_state()->PyBufferedRandom_Type"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=3b3ef9cbbbad4590]*/
/*
* BufferedIOBase class, inherits from IOBase.
*/
PyDoc_STRVAR(bufferediobase_doc,
"Base class for buffered IO objects.\n"
"\n"
"The main difference with RawIOBase is that the read() method\n"
"supports omitting the size argument, and does not have a default\n"
"implementation that defers to readinto().\n"
"\n"
"In addition, read(), readinto() and write() may raise\n"
"BlockingIOError if the underlying raw stream is in non-blocking\n"
"mode and not ready; unlike their raw counterparts, they will never\n"
"return None.\n"
"\n"
"A typical implementation should not inherit from a RawIOBase\n"
"implementation, but wrap one.\n"
);
static PyObject *
_bufferediobase_readinto_generic(PyObject *self, Py_buffer *buffer, char readinto1)
{
Py_ssize_t len;
PyObject *data;
PyObject *attr = readinto1
? &_Py_ID(read1)
: &_Py_ID(read);
data = _PyObject_CallMethod(self, attr, "n", buffer->len);
if (data == NULL)
return NULL;
if (!PyBytes_Check(data)) {
Py_DECREF(data);
PyErr_SetString(PyExc_TypeError, "read() should return bytes");
return NULL;
}
len = PyBytes_GET_SIZE(data);
if (len > buffer->len) {
PyErr_Format(PyExc_ValueError,
"read() returned too much data: "
"%zd bytes requested, %zd returned",
buffer->len, len);
Py_DECREF(data);
return NULL;
}
memcpy(buffer->buf, PyBytes_AS_STRING(data), len);
Py_DECREF(data);
return PyLong_FromSsize_t(len);
}
/*[clinic input]
@critical_section
_io._BufferedIOBase.readinto
buffer: Py_buffer(accept={rwbuffer})
/
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_readinto_impl(PyObject *self, Py_buffer *buffer)
/*[clinic end generated code: output=8c8cda6684af8038 input=5273d20db7f56e1a]*/
{
return _bufferediobase_readinto_generic(self, buffer, 0);
}
/*[clinic input]
@critical_section
_io._BufferedIOBase.readinto1
buffer: Py_buffer(accept={rwbuffer})
/
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_readinto1_impl(PyObject *self, Py_buffer *buffer)
/*[clinic end generated code: output=358623e4fd2b69d3 input=d6eb723dedcee654]*/
{
return _bufferediobase_readinto_generic(self, buffer, 1);
}
static PyObject *
bufferediobase_unsupported(_PyIO_State *state, const char *message)
{
PyErr_SetString(state->unsupported_operation, message);
return NULL;
}
/*[clinic input]
_io._BufferedIOBase.detach
cls: defining_class
/
Disconnect this buffer from its underlying raw stream and return it.
After the raw stream has been detached, the buffer is in an unusable
state.
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_detach_impl(PyObject *self, PyTypeObject *cls)
/*[clinic end generated code: output=b87b135d67cd4448 input=0b61a7b4357c1ea7]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return bufferediobase_unsupported(state, "detach");
}
/*[clinic input]
_io._BufferedIOBase.read
cls: defining_class
size: int(unused=True) = -1
/
Read and return up to n bytes.
If the size argument is omitted, None, or negative, read and
return all data until EOF.
If the size argument is positive, and the underlying raw stream is
not 'interactive', multiple raw reads may be issued to satisfy
the byte count (unless EOF is reached first).
However, for interactive raw streams (as well as sockets and pipes),
at most one raw read will be issued, and a short result does not
imply that EOF is imminent.
Return an empty bytes object on EOF.
Return None if the underlying raw stream was open in non-blocking
mode and no data is available at the moment.
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_read_impl(PyObject *self, PyTypeObject *cls,
int Py_UNUSED(size))
/*[clinic end generated code: output=aceb2765587b0a29 input=824f6f910465e61a]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return bufferediobase_unsupported(state, "read");
}
/*[clinic input]
_io._BufferedIOBase.read1
cls: defining_class
size: int(unused=True) = -1
/
Read and return up to size bytes, with at most one read() call to the underlying raw stream.
Return an empty bytes object on EOF.
A short result does not imply that EOF is imminent.
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_read1_impl(PyObject *self, PyTypeObject *cls,
int Py_UNUSED(size))
/*[clinic end generated code: output=2e7fc62972487eaa input=af76380e020fd9e6]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return bufferediobase_unsupported(state, "read1");
}
/*[clinic input]
_io._BufferedIOBase.write
cls: defining_class
b: object(unused=True)
/
Write buffer b to the IO stream.
Return the number of bytes written, which is always
the length of b in bytes.
Raise BlockingIOError if the buffer is full and the
underlying raw stream cannot accept more data at the moment.
[clinic start generated code]*/
static PyObject *
_io__BufferedIOBase_write_impl(PyObject *self, PyTypeObject *cls,
PyObject *Py_UNUSED(b))
/*[clinic end generated code: output=712c635246bf2306 input=9793f5c8f71029ad]*/
{
_PyIO_State *state = get_io_state_by_cls(cls);
return bufferediobase_unsupported(state, "write");
}
typedef struct {
PyObject_HEAD
PyObject *raw;
int ok; /* Initialized? */
int detached;
int readable;
int writable;
char finalizing;
/* True if this is a vanilla Buffered object (rather than a user derived
class) *and* the raw stream is a vanilla FileIO object. */
int fast_closed_checks;
/* Absolute position inside the raw stream (-1 if unknown). */
Py_off_t abs_pos;
/* A static buffer of size `buffer_size` */
char *buffer;
/* Current logical position in the buffer. */
Py_off_t pos;
/* Position of the raw stream in the buffer. */
Py_off_t raw_pos;
/* Just after the last buffered byte in the buffer, or -1 if the buffer
isn't ready for reading. */
Py_off_t read_end;
/* Just after the last byte actually written */
Py_off_t write_pos;
/* Just after the last byte waiting to be written, or -1 if the buffer
isn't ready for writing. */
Py_off_t write_end;
PyThread_type_lock lock;
volatile unsigned long owner;
Py_ssize_t buffer_size;
Py_ssize_t buffer_mask;
PyObject *dict;
PyObject *weakreflist;
} buffered;
#define buffered_CAST(op) ((buffered *)(op))
/*
Implementation notes:
* BufferedReader, BufferedWriter and BufferedRandom try to share most
methods (this is helped by the members `readable` and `writable`, which
are initialized in the respective constructors)
* They also share a single buffer for reading and writing. This enables
interleaved reads and writes without flushing. It also makes the logic
a bit trickier to get right.
* The absolute position of the raw stream is cached, if possible, in the
`abs_pos` member. It must be updated every time an operation is done
on the raw stream. If not sure, it can be reinitialized by calling
_buffered_raw_tell(), which queries the raw stream (_buffered_raw_seek()
also does it). To read it, use RAW_TELL().
* Three helpers, _bufferedreader_raw_read, _bufferedwriter_raw_write and
_bufferedwriter_flush_unlocked do a lot of useful housekeeping.
NOTE: we should try to maintain block alignment of reads and writes to the
raw stream (according to the buffer size), but for now it is only done
in read() and friends.
*/
/* These macros protect the buffered object against concurrent operations. */
static int
_enter_buffered_busy(buffered *self)
{
int relax_locking;
PyLockStatus st;
if (self->owner == PyThread_get_thread_ident()) {
PyErr_Format(PyExc_RuntimeError,
"reentrant call inside %R", self);
return 0;
}
PyInterpreterState *interp = _PyInterpreterState_GET();
relax_locking = _Py_IsInterpreterFinalizing(interp);
Py_BEGIN_ALLOW_THREADS
if (!relax_locking)
st = PyThread_acquire_lock(self->lock, 1);
else {
/* When finalizing, we don't want a deadlock to happen with daemon
* threads abruptly shut down while they owned the lock.
* Therefore, only wait for a grace period (1 s.).
* Note that non-daemon threads have already exited here, so this
* shouldn't affect carefully written threaded I/O code.
*/
st = PyThread_acquire_lock_timed(self->lock, (PY_TIMEOUT_T)1e6, 0);
}
Py_END_ALLOW_THREADS
if (relax_locking && st != PY_LOCK_ACQUIRED) {
PyObject *ascii = PyObject_ASCII((PyObject*)self);
_Py_FatalErrorFormat(__func__,
"could not acquire lock for %s at interpreter "
"shutdown, possibly due to daemon threads",
ascii ? PyUnicode_AsUTF8(ascii) : "<ascii(self) failed>");
}
return 1;
}
#define ENTER_BUFFERED(self) \
( (PyThread_acquire_lock(self->lock, 0) ? \
1 : _enter_buffered_busy(self)) \
&& (self->owner = PyThread_get_thread_ident(), 1) )
#define LEAVE_BUFFERED(self) \
do { \
self->owner = 0; \
PyThread_release_lock(self->lock); \
} while(0);
#define CHECK_INITIALIZED(self) \
if (self->ok <= 0) { \
if (self->detached) { \
PyErr_SetString(PyExc_ValueError, \
"raw stream has been detached"); \
} else { \
PyErr_SetString(PyExc_ValueError, \
"I/O operation on uninitialized object"); \
} \
return NULL; \
}
#define CHECK_INITIALIZED_INT(self) \
if (self->ok <= 0) { \
if (self->detached) { \
PyErr_SetString(PyExc_ValueError, \
"raw stream has been detached"); \
} else { \
PyErr_SetString(PyExc_ValueError, \
"I/O operation on uninitialized object"); \
} \
return -1; \
}
#define IS_CLOSED(self) \
(!self->buffer || \
(self->fast_closed_checks \
? _PyFileIO_closed(self->raw) \
: buffered_closed(self)))
#define CHECK_CLOSED(self, error_msg) \
if (IS_CLOSED(self) && (Py_SAFE_DOWNCAST(READAHEAD(self), Py_off_t, Py_ssize_t) == 0)) { \
PyErr_SetString(PyExc_ValueError, error_msg); \
return NULL; \
} \
#define VALID_READ_BUFFER(self) \
(self->readable && self->read_end != -1)
#define VALID_WRITE_BUFFER(self) \
(self->writable && self->write_end != -1)
#define ADJUST_POSITION(self, _new_pos) \
do { \
self->pos = _new_pos; \
if (VALID_READ_BUFFER(self) && self->read_end < self->pos) \
self->read_end = self->pos; \
} while(0)
#define READAHEAD(self) \
((self->readable && VALID_READ_BUFFER(self)) \
? (self->read_end - self->pos) : 0)
#define RAW_OFFSET(self) \
(((VALID_READ_BUFFER(self) || VALID_WRITE_BUFFER(self)) \
&& self->raw_pos >= 0) ? self->raw_pos - self->pos : 0)
#define RAW_TELL(self) \
(self->abs_pos != -1 ? self->abs_pos : _buffered_raw_tell(self))
#define MINUS_LAST_BLOCK(self, size) \
(self->buffer_mask ? \
(size & ~self->buffer_mask) : \
(self->buffer_size * (size / self->buffer_size)))
static int
buffered_clear(PyObject *op)
{
buffered *self = buffered_CAST(op);
self->ok = 0;
Py_CLEAR(self->raw);
Py_CLEAR(self->dict);
return 0;
}
static void
buffered_dealloc(PyObject *op)
{
buffered *self = buffered_CAST(op);
PyTypeObject *tp = Py_TYPE(self);
self->finalizing = 1;
if (_PyIOBase_finalize(op) < 0)
return;
_PyObject_GC_UNTRACK(self);
self->ok = 0;
if (self->weakreflist != NULL)
PyObject_ClearWeakRefs(op);
if (self->buffer) {
PyMem_Free(self->buffer);
self->buffer = NULL;
}
if (self->lock) {
PyThread_free_lock(self->lock);
self->lock = NULL;
}
(void)buffered_clear(op);
tp->tp_free(self);
Py_DECREF(tp);
}
/*[clinic input]
@critical_section
_io._Buffered.__sizeof__
[clinic start generated code]*/
static PyObject *
_io__Buffered___sizeof___impl(buffered *self)
/*[clinic end generated code: output=0231ef7f5053134e input=07a32d578073ea64]*/
{
size_t res = _PyObject_SIZE(Py_TYPE(self));
if (self->buffer) {
res += (size_t)self->buffer_size;
}
return PyLong_FromSize_t(res);
}
static int
buffered_traverse(buffered *self, visitproc visit, void *arg)
{
Py_VISIT(Py_TYPE(self));
Py_VISIT(self->raw);
Py_VISIT(self->dict);
return 0;
}
/* Because this can call arbitrary code, it shouldn't be called when
the refcount is 0 (that is, not directly from tp_dealloc unless
the refcount has been temporarily re-incremented). */
/*[clinic input]
_io._Buffered._dealloc_warn
source: object
/
[clinic start generated code]*/
static PyObject *
_io__Buffered__dealloc_warn(buffered *self, PyObject *source)
/*[clinic end generated code: output=690dcc3df8967162 input=8f845f2a4786391c]*/
{
if (self->ok && self->raw) {
PyObject *r;
r = PyObject_CallMethodOneArg(self->raw, &_Py_ID(_dealloc_warn), source);
if (r)
Py_DECREF(r);
else
PyErr_Clear();
}
Py_RETURN_NONE;
}
/*
* _BufferedIOMixin methods
* This is not a class, just a collection of methods that will be reused
* by BufferedReader and BufferedWriter
*/
/* Flush and close */
/*[clinic input]
@critical_section
_io._Buffered.flush as _io__Buffered_simple_flush
[clinic start generated code]*/
static PyObject *
_io__Buffered_simple_flush_impl(buffered *self)
/*[clinic end generated code: output=29ebb3820db1bdfd input=5248cb84a65f80bd]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(flush));
}
static int
buffered_closed(buffered *self)
{
int closed;
PyObject *res;
CHECK_INITIALIZED_INT(self)
res = PyObject_GetAttr(self->raw, &_Py_ID(closed));
if (res == NULL)
return -1;
closed = PyObject_IsTrue(res);
Py_DECREF(res);
return closed;
}
/*[clinic input]
@critical_section
@getter
_io._Buffered.closed
[clinic start generated code]*/
static PyObject *
_io__Buffered_closed_get_impl(buffered *self)
/*[clinic end generated code: output=f08ce57290703a1a input=18eddefdfe4a3d2f]*/
{
CHECK_INITIALIZED(self)
return PyObject_GetAttr(self->raw, &_Py_ID(closed));
}
/*[clinic input]
@critical_section
_io._Buffered.close
[clinic start generated code]*/
static PyObject *
_io__Buffered_close_impl(buffered *self)
/*[clinic end generated code: output=7280b7b42033be0c input=56d95935b03fd326]*/
{
PyObject *res = NULL;
int r;
CHECK_INITIALIZED(self)
if (!ENTER_BUFFERED(self)) {
return NULL;
}
r = buffered_closed(self);
if (r < 0)
goto end;
if (r > 0) {
res = Py_NewRef(Py_None);
goto end;
}
if (self->finalizing) {
PyObject *r = _io__Buffered__dealloc_warn(self, (PyObject *) self);
if (r)
Py_DECREF(r);
else
PyErr_Clear();
}
/* flush() will most probably re-take the lock, so drop it first */
LEAVE_BUFFERED(self)
r = _PyFile_Flush((PyObject *)self);
if (!ENTER_BUFFERED(self)) {
return NULL;
}
PyObject *exc = NULL;
if (r < 0) {
exc = PyErr_GetRaisedException();
}
res = PyObject_CallMethodNoArgs(self->raw, &_Py_ID(close));
if (self->buffer) {
PyMem_Free(self->buffer);
self->buffer = NULL;
}
if (exc != NULL) {
_PyErr_ChainExceptions1(exc);
Py_CLEAR(res);
}
self->read_end = 0;
self->pos = 0;
end:
LEAVE_BUFFERED(self)
return res;
}
/*[clinic input]
@critical_section
_io._Buffered.detach
[clinic start generated code]*/
static PyObject *
_io__Buffered_detach_impl(buffered *self)
/*[clinic end generated code: output=dd0fc057b8b779f7 input=d4ef1828a678be37]*/
{
PyObject *raw;
CHECK_INITIALIZED(self)
if (_PyFile_Flush((PyObject *)self) < 0) {
return NULL;
}
raw = self->raw;
self->raw = NULL;
self->detached = 1;
self->ok = 0;
return raw;
}
/* Inquiries */
/*[clinic input]
@critical_section
_io._Buffered.seekable
[clinic start generated code]*/
static PyObject *
_io__Buffered_seekable_impl(buffered *self)
/*[clinic end generated code: output=90172abb5ceb6e8f input=e3a4fc1d297b2fd3]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(seekable));
}
/*[clinic input]
@critical_section
_io._Buffered.readable
[clinic start generated code]*/
static PyObject *
_io__Buffered_readable_impl(buffered *self)
/*[clinic end generated code: output=92afa07661ecb698 input=abe54107d59bca9a]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(readable));
}
/*[clinic input]
@critical_section
_io._Buffered.writable
[clinic start generated code]*/
static PyObject *
_io__Buffered_writable_impl(buffered *self)
/*[clinic end generated code: output=4e3eee8d6f9d8552 input=45eb76bf6a10e6f7]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(writable));
}
/*[clinic input]
@critical_section
@getter
_io._Buffered.name
[clinic start generated code]*/
static PyObject *
_io__Buffered_name_get_impl(buffered *self)
/*[clinic end generated code: output=d2adf384051d3d10 input=6b84a0e6126f545e]*/
{
CHECK_INITIALIZED(self)
return PyObject_GetAttr(self->raw, &_Py_ID(name));
}
/*[clinic input]
@critical_section
@getter
_io._Buffered.mode
[clinic start generated code]*/
static PyObject *
_io__Buffered_mode_get_impl(buffered *self)
/*[clinic end generated code: output=0feb205748892fa4 input=0762d5e28542fd8c]*/
{
CHECK_INITIALIZED(self)
return PyObject_GetAttr(self->raw, &_Py_ID(mode));
}
/* Lower-level APIs */
/*[clinic input]
@critical_section
_io._Buffered.fileno
[clinic start generated code]*/
static PyObject *
_io__Buffered_fileno_impl(buffered *self)
/*[clinic end generated code: output=b717648d58a95ee3 input=1c4fead777bae20a]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(fileno));
}
/*[clinic input]
@critical_section
_io._Buffered.isatty
[clinic start generated code]*/
static PyObject *
_io__Buffered_isatty_impl(buffered *self)
/*[clinic end generated code: output=c20e55caae67baea input=e53d182d7e490e3a]*/
{
CHECK_INITIALIZED(self)
return PyObject_CallMethodNoArgs(self->raw, &_Py_ID(isatty));
}
/* Forward decls */
static PyObject *
_bufferedwriter_flush_unlocked(buffered *);
static Py_ssize_t
_bufferedreader_fill_buffer(buffered *self);
static void
_bufferedreader_reset_buf(buffered *self);
static void
_bufferedwriter_reset_buf(buffered *self);
static PyObject *
_bufferedreader_peek_unlocked(buffered *self);
static PyObject *
_bufferedreader_read_all(buffered *self);
static PyObject *
_bufferedreader_read_fast(buffered *self, Py_ssize_t);
static PyObject *
_bufferedreader_read_generic(buffered *self, Py_ssize_t);
static Py_ssize_t
_bufferedreader_raw_read(buffered *self, char *start, Py_ssize_t len);
/*
* Helpers
*/
/* Sets the current error to BlockingIOError */
static void
_set_BlockingIOError(const char *msg, Py_ssize_t written)
{
PyObject *err;
PyErr_Clear();
err = PyObject_CallFunction(PyExc_BlockingIOError, "isn",
errno, msg, written);
if (err)
PyErr_SetObject(PyExc_BlockingIOError, err);
Py_XDECREF(err);
}
/* Returns the address of the `written` member if a BlockingIOError was
raised, NULL otherwise. The error is always re-raised. */
static Py_ssize_t *
_buffered_check_blocking_error(void)
{
PyObject *exc = PyErr_GetRaisedException();
if (exc == NULL || !PyErr_GivenExceptionMatches(exc, PyExc_BlockingIOError)) {
PyErr_SetRaisedException(exc);
return NULL;
}
PyOSErrorObject *err = (PyOSErrorObject *)exc;
/* TODO: sanity check (err->written >= 0) */
PyErr_SetRaisedException(exc);
return &err->written;
}
static Py_off_t
_buffered_raw_tell(buffered *self)
{
Py_off_t n;
PyObject *res;
res = PyObject_CallMethodNoArgs(self->raw, &_Py_ID(tell));
if (res == NULL)
return -1;
n = PyNumber_AsOff_t(res, PyExc_ValueError);
Py_DECREF(res);
if (n < 0) {
if (!PyErr_Occurred())
PyErr_Format(PyExc_OSError,
"Raw stream returned invalid position %" PY_PRIdOFF,
(PY_OFF_T_COMPAT)n);
return -1;
}
self->abs_pos = n;
return n;
}
static Py_off_t
_buffered_raw_seek(buffered *self, Py_off_t target, int whence)
{
PyObject *res, *posobj, *whenceobj;
Py_off_t n;
posobj = PyLong_FromOff_t(target);
if (posobj == NULL)
return -1;
whenceobj = PyLong_FromLong(whence);
if (whenceobj == NULL) {
Py_DECREF(posobj);
return -1;
}
res = PyObject_CallMethodObjArgs(self->raw, &_Py_ID(seek),
posobj, whenceobj, NULL);
Py_DECREF(posobj);
Py_DECREF(whenceobj);
if (res == NULL)
return -1;
n = PyNumber_AsOff_t(res, PyExc_ValueError);
Py_DECREF(res);
if (n < 0) {
if (!PyErr_Occurred())
PyErr_Format(PyExc_OSError,
"Raw stream returned invalid position %" PY_PRIdOFF,
(PY_OFF_T_COMPAT)n);
return -1;
}
self->abs_pos = n;
return n;
}
static int
_buffered_init(buffered *self)
{
Py_ssize_t n;
if (self->buffer_size <= 0) {
PyErr_SetString(PyExc_ValueError,
"buffer size must be strictly positive");
return -1;
}
if (self->buffer)
PyMem_Free(self->buffer);
self->buffer = PyMem_Malloc(self->buffer_size);
if (self->buffer == NULL) {
PyErr_NoMemory();
return -1;
}
if (self->lock)
PyThread_free_lock(self->lock);
self->lock = PyThread_allocate_lock();
if (self->lock == NULL) {
PyErr_SetString(PyExc_RuntimeError, "can't allocate read lock");
return -1;
}
self->owner = 0;
/* Find out whether buffer_size is a power of 2 */
/* XXX is this optimization useful? */
for (n = self->buffer_size - 1; n & 1; n >>= 1)
;
if (n == 0)
self->buffer_mask = self->buffer_size - 1;
else
self->buffer_mask = 0;
if (_buffered_raw_tell(self) == -1)
PyErr_Clear();
return 0;
}
/* Return 1 if an OSError with errno == EINTR is set (and then
clears the error indicator), 0 otherwise.
Should only be called when PyErr_Occurred() is true.
*/
int
_PyIO_trap_eintr(void)
{
if (!PyErr_ExceptionMatches(PyExc_OSError)) {
return 0;
}
PyObject *exc = PyErr_GetRaisedException();
PyOSErrorObject *env_err = (PyOSErrorObject *)exc;
assert(env_err != NULL);
if (env_err->myerrno != NULL) {
assert(EINTR > 0 && EINTR < INT_MAX);
assert(PyLong_CheckExact(env_err->myerrno));
int overflow;
int myerrno = PyLong_AsLongAndOverflow(env_err->myerrno, &overflow);
PyErr_Clear();
if (myerrno == EINTR) {
Py_DECREF(exc);
return 1;
}
}
/* This silences any error set by PyObject_RichCompareBool() */
PyErr_SetRaisedException(exc);
return 0;
}
/*
* Shared methods and wrappers
*/
static PyObject *
buffered_flush_and_rewind_unlocked(buffered *self)
{
PyObject *res;
res = _bufferedwriter_flush_unlocked(self);
if (res == NULL)
return NULL;
Py_DECREF(res);
if (self->readable) {
/* Rewind the raw stream so that its position corresponds to
the current logical position. */
Py_off_t n;
n = _buffered_raw_seek(self, -RAW_OFFSET(self), 1);
_bufferedreader_reset_buf(self);
if (n == -1)
return NULL;
}
Py_RETURN_NONE;
}
/*[clinic input]
@critical_section
_io._Buffered.flush
[clinic start generated code]*/
static PyObject *
_io__Buffered_flush_impl(buffered *self)
/*[clinic end generated code: output=da2674ef1ce71f3a input=6b30de9f083419c2]*/
{
PyObject *res;
CHECK_INITIALIZED(self)
CHECK_CLOSED(self, "flush of closed file")
if (!ENTER_BUFFERED(self))
return NULL;
res = buffered_flush_and_rewind_unlocked(self);
LEAVE_BUFFERED(self)
return res;
}
/*[clinic input]
@critical_section
_io._Buffered.peek
size: Py_ssize_t = 0
/
[clinic start generated code]*/
static PyObject *
_io__Buffered_peek_impl(buffered *self, Py_ssize_t size)
/*[clinic end generated code: output=ba7a097ca230102b input=56733376f926d982]*/
{
PyObject *res = NULL;
CHECK_INITIALIZED(self)
CHECK_CLOSED(self, "peek of closed file")
if (!ENTER_BUFFERED(self))
return NULL;
if (self->writable) {
res = buffered_flush_and_rewind_unlocked(self);
if (res == NULL)
goto end;
Py_CLEAR(res);
}
res = _bufferedreader_peek_unlocked(self);
end:
LEAVE_BUFFERED(self)
return res;
}
/*[clinic input]
@critical_section
_io._Buffered.read
size as n: Py_ssize_t(accept={int, NoneType}) = -1
/
[clinic start generated code]*/
static PyObject *
_io__Buffered_read_impl(buffered *self, Py_ssize_t n)
/*[clinic end generated code: output=f41c78bb15b9bbe9 input=bdb4b0425b295472]*/
{
PyObject *res;
CHECK_INITIALIZED(self)
if (n < -1) {
PyErr_SetString(PyExc_ValueError,
"read length must be non-negative or -1");
return NULL;
}
CHECK_CLOSED(self, "read of closed file")
if (n == -1) {
/* The number of bytes is unspecified, read until the end of stream */
if (!ENTER_BUFFERED(self))
return NULL;
res = _bufferedreader_read_all(self);
}
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