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overlapped.c
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/*
* Support for overlapped IO
*
* Some code borrowed from Modules/_winapi.c of CPython
*/
/* XXX check overflow and DWORD <-> Py_ssize_t conversions
Check itemsize */
#ifndef Py_BUILD_CORE_BUILTIN
# define Py_BUILD_CORE_MODULE 1
#endif
#include "Python.h"
#define WINDOWS_LEAN_AND_MEAN
#include <winsock2.h>
#include <ws2tcpip.h>
#include <mswsock.h>
#if defined(MS_WIN32) && !defined(MS_WIN64)
# define F_POINTER "k"
# define T_POINTER Py_T_ULONG
#else
# define F_POINTER "K"
# define T_POINTER Py_T_ULONGLONG
#endif
#define F_HANDLE F_POINTER
#define F_ULONG_PTR F_POINTER
#define F_DWORD "k"
#define F_BOOL "i"
#define F_UINT "I"
#define T_HANDLE T_POINTER
/*[python input]
class pointer_converter(CConverter):
format_unit = '"F_POINTER"'
def parse_arg(self, argname, displayname, *, limited_capi):
return self.format_code("""
{paramname} = PyLong_AsVoidPtr({argname});
if (!{paramname} && PyErr_Occurred()) {{{{
goto exit;
}}}}
""",
argname=argname)
class OVERLAPPED_converter(pointer_converter):
type = 'OVERLAPPED *'
class HANDLE_converter(pointer_converter):
type = 'HANDLE'
class ULONG_PTR_converter(pointer_converter):
type = 'ULONG_PTR'
def parse_arg(self, argname, displayname, *, limited_capi):
return self.format_code("""
{paramname} = (uintptr_t)PyLong_AsVoidPtr({argname});
if (!{paramname} && PyErr_Occurred()) {{{{
goto exit;
}}}}
""",
argname=argname)
class DWORD_converter(unsigned_long_converter):
type = 'DWORD'
class BOOL_converter(int_converter):
type = 'BOOL'
[python start generated code]*/
/*[python end generated code: output=da39a3ee5e6b4b0d input=436f4440630a304c]*/
/*[clinic input]
module _overlapped
class _overlapped.Overlapped "OverlappedObject *" "&OverlappedType"
[clinic start generated code]*/
/*[clinic end generated code: output=da39a3ee5e6b4b0d input=92e5a799db35b96c]*/
enum {TYPE_NONE, TYPE_NOT_STARTED, TYPE_READ, TYPE_READINTO, TYPE_WRITE,
TYPE_ACCEPT, TYPE_CONNECT, TYPE_DISCONNECT, TYPE_CONNECT_NAMED_PIPE,
TYPE_WAIT_NAMED_PIPE_AND_CONNECT, TYPE_TRANSMIT_FILE, TYPE_READ_FROM,
TYPE_WRITE_TO, TYPE_READ_FROM_INTO};
typedef struct {
PyObject_HEAD
OVERLAPPED overlapped;
/* For convenience, we store the file handle too */
HANDLE handle;
/* Error returned by last method call */
DWORD error;
/* Type of operation */
DWORD type;
union {
/* Buffer allocated by us: TYPE_READ and TYPE_ACCEPT */
PyObject *allocated_buffer;
/* Buffer passed by the user: TYPE_WRITE, TYPE_WRITE_TO, and TYPE_READINTO */
Py_buffer user_buffer;
/* Data used for reading from a connectionless socket:
TYPE_READ_FROM */
struct {
// A (buffer, (host, port)) tuple
PyObject *result;
// The actual read buffer
PyObject *allocated_buffer;
struct sockaddr_in6 address;
int address_length;
} read_from;
/* Data used for reading from a connectionless socket:
TYPE_READ_FROM_INTO */
struct {
// A (number of bytes read, (host, port)) tuple
PyObject* result;
/* Buffer passed by the user */
Py_buffer user_buffer;
struct sockaddr_in6 address;
int address_length;
} read_from_into;
};
} OverlappedObject;
static inline void
steal_buffer(Py_buffer * dst, Py_buffer * src)
{
memcpy(dst, src, sizeof(Py_buffer));
memset(src, 0, sizeof(Py_buffer));
}
/*
* Map Windows error codes to subclasses of OSError
*/
static PyObject *
SetFromWindowsErr(DWORD err)
{
PyObject *exception_type;
if (err == 0)
err = GetLastError();
switch (err) {
case ERROR_CONNECTION_REFUSED:
exception_type = PyExc_ConnectionRefusedError;
break;
case ERROR_CONNECTION_ABORTED:
exception_type = PyExc_ConnectionAbortedError;
break;
default:
exception_type = PyExc_OSError;
}
return PyErr_SetExcFromWindowsErr(exception_type, err);
}
/*
* Some functions should be loaded at runtime
*/
static LPFN_ACCEPTEX Py_AcceptEx = NULL;
static LPFN_CONNECTEX Py_ConnectEx = NULL;
static LPFN_DISCONNECTEX Py_DisconnectEx = NULL;
static LPFN_TRANSMITFILE Py_TransmitFile = NULL;
#define GET_WSA_POINTER(s, x) \
(SOCKET_ERROR != WSAIoctl(s, SIO_GET_EXTENSION_FUNCTION_POINTER, \
&Guid##x, sizeof(Guid##x), &Py_##x, \
sizeof(Py_##x), &dwBytes, NULL, NULL))
static int
initialize_function_pointers(void)
{
GUID GuidAcceptEx = WSAID_ACCEPTEX;
GUID GuidConnectEx = WSAID_CONNECTEX;
GUID GuidDisconnectEx = WSAID_DISCONNECTEX;
GUID GuidTransmitFile = WSAID_TRANSMITFILE;
SOCKET s;
DWORD dwBytes;
if (Py_AcceptEx != NULL &&
Py_ConnectEx != NULL &&
Py_DisconnectEx != NULL &&
Py_TransmitFile != NULL)
{
// All function pointers are initialized already
// by previous module import
return 0;
}
s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (s == INVALID_SOCKET) {
SetFromWindowsErr(WSAGetLastError());
return -1;
}
if (!GET_WSA_POINTER(s, AcceptEx) ||
!GET_WSA_POINTER(s, ConnectEx) ||
!GET_WSA_POINTER(s, DisconnectEx) ||
!GET_WSA_POINTER(s, TransmitFile))
{
closesocket(s);
SetFromWindowsErr(WSAGetLastError());
return -1;
}
closesocket(s);
return 0;
}
/*
* Completion port stuff
*/
/*[clinic input]
_overlapped.CreateIoCompletionPort
handle as FileHandle: HANDLE
port as ExistingCompletionPort: HANDLE
key as CompletionKey: ULONG_PTR
concurrency as NumberOfConcurrentThreads: DWORD
/
Create a completion port or register a handle with a port.
[clinic start generated code]*/
static PyObject *
_overlapped_CreateIoCompletionPort_impl(PyObject *module, HANDLE FileHandle,
HANDLE ExistingCompletionPort,
ULONG_PTR CompletionKey,
DWORD NumberOfConcurrentThreads)
/*[clinic end generated code: output=24ede2b0f05e5433 input=847bae4d0efe1976]*/
{
HANDLE ret;
Py_BEGIN_ALLOW_THREADS
ret = CreateIoCompletionPort(FileHandle, ExistingCompletionPort,
CompletionKey, NumberOfConcurrentThreads);
Py_END_ALLOW_THREADS
if (ret == NULL)
return SetFromWindowsErr(0);
return Py_BuildValue(F_HANDLE, ret);
}
/*[clinic input]
_overlapped.GetQueuedCompletionStatus
port as CompletionPort: HANDLE
msecs as Milliseconds: DWORD
/
Get a message from completion port.
Wait for up to msecs milliseconds.
[clinic start generated code]*/
static PyObject *
_overlapped_GetQueuedCompletionStatus_impl(PyObject *module,
HANDLE CompletionPort,
DWORD Milliseconds)
/*[clinic end generated code: output=68314171628dddb7 input=94a042d14c4f6410]*/
{
DWORD NumberOfBytes = 0;
ULONG_PTR CompletionKey = 0;
OVERLAPPED *Overlapped = NULL;
DWORD err;
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = GetQueuedCompletionStatus(CompletionPort, &NumberOfBytes,
&CompletionKey, &Overlapped, Milliseconds);
Py_END_ALLOW_THREADS
err = ret ? ERROR_SUCCESS : GetLastError();
if (Overlapped == NULL) {
if (err == WAIT_TIMEOUT)
Py_RETURN_NONE;
else
return SetFromWindowsErr(err);
}
return Py_BuildValue(F_DWORD F_DWORD F_ULONG_PTR F_POINTER,
err, NumberOfBytes, CompletionKey, Overlapped);
}
/*[clinic input]
_overlapped.PostQueuedCompletionStatus
port as CompletionPort: HANDLE
bytes as NumberOfBytes: DWORD
key as CompletionKey: ULONG_PTR
address as Overlapped: OVERLAPPED
/
Post a message to completion port.
[clinic start generated code]*/
static PyObject *
_overlapped_PostQueuedCompletionStatus_impl(PyObject *module,
HANDLE CompletionPort,
DWORD NumberOfBytes,
ULONG_PTR CompletionKey,
OVERLAPPED *Overlapped)
/*[clinic end generated code: output=93e73f2933a43e9e input=e936202d87937aca]*/
{
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = PostQueuedCompletionStatus(CompletionPort, NumberOfBytes,
CompletionKey, Overlapped);
Py_END_ALLOW_THREADS
if (!ret)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*
* Wait for a handle
*/
struct PostCallbackData {
HANDLE CompletionPort;
LPOVERLAPPED Overlapped;
};
static VOID CALLBACK
PostToQueueCallback(PVOID lpParameter, BOOLEAN TimerOrWaitFired)
{
struct PostCallbackData *p = (struct PostCallbackData*) lpParameter;
PostQueuedCompletionStatus(p->CompletionPort, TimerOrWaitFired,
0, p->Overlapped);
/* ignore possible error! */
PyMem_RawFree(p);
}
/*[clinic input]
_overlapped.RegisterWaitWithQueue
Object: HANDLE
CompletionPort: HANDLE
Overlapped: OVERLAPPED
Timeout as Milliseconds: DWORD
/
Register wait for Object; when complete CompletionPort is notified.
[clinic start generated code]*/
static PyObject *
_overlapped_RegisterWaitWithQueue_impl(PyObject *module, HANDLE Object,
HANDLE CompletionPort,
OVERLAPPED *Overlapped,
DWORD Milliseconds)
/*[clinic end generated code: output=c2ace732e447fe45 input=2dd4efee44abe8ee]*/
{
HANDLE NewWaitObject;
struct PostCallbackData data = {CompletionPort, Overlapped}, *pdata;
/* Use PyMem_RawMalloc() rather than PyMem_Malloc(), since
PostToQueueCallback() will call PyMem_Free() from a new C thread
which doesn't hold the GIL. */
pdata = PyMem_RawMalloc(sizeof(struct PostCallbackData));
if (pdata == NULL)
return SetFromWindowsErr(0);
*pdata = data;
if (!RegisterWaitForSingleObject(
&NewWaitObject, Object, PostToQueueCallback, pdata, Milliseconds,
WT_EXECUTEINWAITTHREAD | WT_EXECUTEONLYONCE))
{
SetFromWindowsErr(0);
PyMem_RawFree(pdata);
return NULL;
}
return Py_BuildValue(F_HANDLE, NewWaitObject);
}
/*[clinic input]
_overlapped.UnregisterWait
WaitHandle: HANDLE
/
Unregister wait handle.
[clinic start generated code]*/
static PyObject *
_overlapped_UnregisterWait_impl(PyObject *module, HANDLE WaitHandle)
/*[clinic end generated code: output=ec90cd955a9a617d input=a56709544cb2df0f]*/
{
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = UnregisterWait(WaitHandle);
Py_END_ALLOW_THREADS
if (!ret)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*[clinic input]
_overlapped.UnregisterWaitEx
WaitHandle: HANDLE
Event: HANDLE
/
Unregister wait handle.
[clinic start generated code]*/
static PyObject *
_overlapped_UnregisterWaitEx_impl(PyObject *module, HANDLE WaitHandle,
HANDLE Event)
/*[clinic end generated code: output=2e3d84c1d5f65b92 input=953cddc1de50fab9]*/
{
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = UnregisterWaitEx(WaitHandle, Event);
Py_END_ALLOW_THREADS
if (!ret)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*
* Event functions -- currently only used by tests
*/
/*[clinic input]
_overlapped.CreateEvent
EventAttributes: object
ManualReset: BOOL
InitialState: BOOL
Name: Py_UNICODE(accept={str, NoneType})
/
Create an event.
EventAttributes must be None.
[clinic start generated code]*/
static PyObject *
_overlapped_CreateEvent_impl(PyObject *module, PyObject *EventAttributes,
BOOL ManualReset, BOOL InitialState,
const wchar_t *Name)
/*[clinic end generated code: output=b17ddc5fd506972d input=dbc36ae14375ba24]*/
{
HANDLE Event;
if (EventAttributes != Py_None) {
PyErr_SetString(PyExc_ValueError, "EventAttributes must be None");
return NULL;
}
Py_BEGIN_ALLOW_THREADS
Event = CreateEventW(NULL, ManualReset, InitialState, Name);
Py_END_ALLOW_THREADS
if (Event == NULL)
return SetFromWindowsErr(0);
return Py_BuildValue(F_HANDLE, Event);
}
/*[clinic input]
_overlapped.SetEvent
Handle: HANDLE
/
Set event.
[clinic start generated code]*/
static PyObject *
_overlapped_SetEvent_impl(PyObject *module, HANDLE Handle)
/*[clinic end generated code: output=5b8d974216b0e569 input=d8b0d26eb7391e80]*/
{
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = SetEvent(Handle);
Py_END_ALLOW_THREADS
if (!ret)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*[clinic input]
_overlapped.ResetEvent
Handle: HANDLE
/
Reset event.
[clinic start generated code]*/
static PyObject *
_overlapped_ResetEvent_impl(PyObject *module, HANDLE Handle)
/*[clinic end generated code: output=066537a8405cddb2 input=d4e089c9ba84ff2f]*/
{
BOOL ret;
Py_BEGIN_ALLOW_THREADS
ret = ResetEvent(Handle);
Py_END_ALLOW_THREADS
if (!ret)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*
* Bind socket handle to local port without doing slow getaddrinfo()
*/
/*[clinic input]
_overlapped.BindLocal
handle as Socket: HANDLE
family as Family: int
/
Bind a socket handle to an arbitrary local port.
family should be AF_INET or AF_INET6.
[clinic start generated code]*/
static PyObject *
_overlapped_BindLocal_impl(PyObject *module, HANDLE Socket, int Family)
/*[clinic end generated code: output=edb93862697aed9c input=a0e7b5c2f541170c]*/
{
BOOL ret;
if (Family == AF_INET) {
struct sockaddr_in addr;
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = 0;
addr.sin_addr.S_un.S_addr = INADDR_ANY;
ret = bind((SOCKET)Socket, (SOCKADDR*)&addr, sizeof(addr))
!= SOCKET_ERROR;
} else if (Family == AF_INET6) {
struct sockaddr_in6 addr;
memset(&addr, 0, sizeof(addr));
addr.sin6_family = AF_INET6;
addr.sin6_port = 0;
addr.sin6_addr = in6addr_any;
ret = bind((SOCKET)Socket, (SOCKADDR*)&addr, sizeof(addr))
!= SOCKET_ERROR;
} else {
PyErr_SetString(PyExc_ValueError, "expected tuple of length 2 or 4");
return NULL;
}
if (!ret)
return SetFromWindowsErr(WSAGetLastError());
Py_RETURN_NONE;
}
/*
* Windows equivalent of os.strerror() -- compare _ctypes/callproc.c
*/
/*[clinic input]
_overlapped.FormatMessage
error_code as code: DWORD
/
Return error message for an error code.
[clinic start generated code]*/
static PyObject *
_overlapped_FormatMessage_impl(PyObject *module, DWORD code)
/*[clinic end generated code: output=02c964ff22407c6b input=644bb5b80326179e]*/
{
DWORD n;
WCHAR *lpMsgBuf;
PyObject *res;
n = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER |
FORMAT_MESSAGE_FROM_SYSTEM |
FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPWSTR) &lpMsgBuf,
0,
NULL);
if (n) {
while (iswspace(lpMsgBuf[n-1]))
--n;
res = PyUnicode_FromWideChar(lpMsgBuf, n);
} else {
res = PyUnicode_FromFormat("unknown error code %u", code);
}
LocalFree(lpMsgBuf);
return res;
}
/*
* Mark operation as completed - used when reading produces ERROR_BROKEN_PIPE
*/
static inline void
mark_as_completed(OVERLAPPED *ov)
{
ov->Internal = 0;
if (ov->hEvent != NULL)
SetEvent(ov->hEvent);
}
/*
* A Python object wrapping an OVERLAPPED structure and other useful data
* for overlapped I/O
*/
/*[clinic input]
@classmethod
_overlapped.Overlapped.__new__
event: HANDLE(c_default='INVALID_HANDLE_VALUE') = _overlapped.INVALID_HANDLE_VALUE
OVERLAPPED structure wrapper.
[clinic start generated code]*/
static PyObject *
_overlapped_Overlapped_impl(PyTypeObject *type, HANDLE event)
/*[clinic end generated code: output=6da60504a18eb421 input=26b8a7429e629e95]*/
{
OverlappedObject *self;
if (event == INVALID_HANDLE_VALUE) {
event = CreateEvent(NULL, TRUE, FALSE, NULL);
if (event == NULL)
return SetFromWindowsErr(0);
}
self = PyObject_New(OverlappedObject, type);
if (self == NULL) {
if (event != NULL)
CloseHandle(event);
return NULL;
}
self->handle = NULL;
self->error = 0;
self->type = TYPE_NONE;
self->allocated_buffer = NULL;
memset(&self->overlapped, 0, sizeof(OVERLAPPED));
memset(&self->user_buffer, 0, sizeof(Py_buffer));
if (event)
self->overlapped.hEvent = event;
return (PyObject *)self;
}
/* Note (bpo-32710): OverlappedType.tp_clear is not defined to not release
buffers while overlapped are still running, to prevent a crash. */
static int
Overlapped_clear(OverlappedObject *self)
{
switch (self->type) {
case TYPE_READ:
case TYPE_ACCEPT: {
Py_CLEAR(self->allocated_buffer);
break;
}
case TYPE_READ_FROM: {
// An initial call to WSARecvFrom will only allocate the buffer.
// The result tuple of (message, address) is only
// allocated _after_ a message has been received.
if(self->read_from.result) {
// We've received a message, free the result tuple.
Py_CLEAR(self->read_from.result);
}
if(self->read_from.allocated_buffer) {
Py_CLEAR(self->read_from.allocated_buffer);
}
break;
}
case TYPE_READ_FROM_INTO: {
if (self->read_from_into.result) {
// We've received a message, free the result tuple.
Py_CLEAR(self->read_from_into.result);
}
if (self->read_from_into.user_buffer.obj) {
PyBuffer_Release(&self->read_from_into.user_buffer);
}
break;
}
case TYPE_WRITE:
case TYPE_WRITE_TO:
case TYPE_READINTO: {
if (self->user_buffer.obj) {
PyBuffer_Release(&self->user_buffer);
}
break;
}
}
self->type = TYPE_NOT_STARTED;
return 0;
}
static void
Overlapped_dealloc(OverlappedObject *self)
{
DWORD bytes;
DWORD olderr = GetLastError();
BOOL wait = FALSE;
BOOL ret;
if (!HasOverlappedIoCompleted(&self->overlapped) &&
self->type != TYPE_NOT_STARTED)
{
// NOTE: We should not get here, if we do then something is wrong in
// the IocpProactor or ProactorEventLoop. Since everything uses IOCP if
// the overlapped IO hasn't completed yet then we should not be
// deallocating!
//
// The problem is likely that this OverlappedObject was removed from
// the IocpProactor._cache before it was complete. The _cache holds a
// reference while IO is pending so that it does not get deallocated
// while the kernel has retained the OVERLAPPED structure.
//
// CancelIoEx (likely called from self.cancel()) may have successfully
// completed, but the OVERLAPPED is still in use until either
// HasOverlappedIoCompleted() is true or GetQueuedCompletionStatus has
// returned this OVERLAPPED object.
//
// NOTE: Waiting when IOCP is in use can hang indefinitely, but this
// CancelIoEx is superfluous in that self.cancel() was already called,
// so I've only ever seen this return FALSE with GLE=ERROR_NOT_FOUND
Py_BEGIN_ALLOW_THREADS
if (CancelIoEx(self->handle, &self->overlapped))
wait = TRUE;
ret = GetOverlappedResult(self->handle, &self->overlapped,
&bytes, wait);
Py_END_ALLOW_THREADS
switch (ret ? ERROR_SUCCESS : GetLastError()) {
case ERROR_SUCCESS:
case ERROR_NOT_FOUND:
case ERROR_OPERATION_ABORTED:
break;
default:
PyErr_Format(
PyExc_RuntimeError,
"%R still has pending operation at "
"deallocation, the process may crash", self);
PyErr_WriteUnraisable(NULL);
}
}
if (self->overlapped.hEvent != NULL) {
CloseHandle(self->overlapped.hEvent);
}
Overlapped_clear(self);
SetLastError(olderr);
PyTypeObject *tp = Py_TYPE(self);
PyObject_Free(self);
Py_DECREF(tp);
}
/* Convert IPv4 sockaddr to a Python str. */
static PyObject *
make_ipv4_addr(const struct sockaddr_in *addr)
{
char buf[INET_ADDRSTRLEN];
if (inet_ntop(AF_INET, &addr->sin_addr, buf, sizeof(buf)) == NULL) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyUnicode_FromString(buf);
}
/* Convert IPv6 sockaddr to a Python str. */
static PyObject *
make_ipv6_addr(const struct sockaddr_in6 *addr)
{
char buf[INET6_ADDRSTRLEN];
if (inet_ntop(AF_INET6, &addr->sin6_addr, buf, sizeof(buf)) == NULL) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
return PyUnicode_FromString(buf);
}
static PyObject*
unparse_address(LPSOCKADDR Address, DWORD Length)
{
/* The function is adopted from mocketmodule.c makesockaddr()*/
switch(Address->sa_family) {
case AF_INET: {
const struct sockaddr_in *a = (const struct sockaddr_in *)Address;
PyObject *addrobj = make_ipv4_addr(a);
PyObject *ret = NULL;
if (addrobj) {
ret = Py_BuildValue("Oi", addrobj, ntohs(a->sin_port));
Py_DECREF(addrobj);
}
return ret;
}
case AF_INET6: {
const struct sockaddr_in6 *a = (const struct sockaddr_in6 *)Address;
PyObject *addrobj = make_ipv6_addr(a);
PyObject *ret = NULL;
if (addrobj) {
ret = Py_BuildValue("OiII",
addrobj,
ntohs(a->sin6_port),
ntohl(a->sin6_flowinfo),
a->sin6_scope_id);
Py_DECREF(addrobj);
}
return ret;
}
default: {
PyErr_SetString(PyExc_ValueError, "recvfrom returned unsupported address family");
return NULL;
}
}
}
/*[clinic input]
_overlapped.Overlapped.cancel
Cancel overlapped operation.
[clinic start generated code]*/
static PyObject *
_overlapped_Overlapped_cancel_impl(OverlappedObject *self)
/*[clinic end generated code: output=54ad7aeece89901c input=80eb67c7b57dbcf1]*/
{
BOOL ret = TRUE;
if (self->type == TYPE_NOT_STARTED
|| self->type == TYPE_WAIT_NAMED_PIPE_AND_CONNECT)
Py_RETURN_NONE;
if (!HasOverlappedIoCompleted(&self->overlapped)) {
Py_BEGIN_ALLOW_THREADS
ret = CancelIoEx(self->handle, &self->overlapped);
Py_END_ALLOW_THREADS
}
/* CancelIoEx returns ERROR_NOT_FOUND if the I/O completed in-between */
if (!ret && GetLastError() != ERROR_NOT_FOUND)
return SetFromWindowsErr(0);
Py_RETURN_NONE;
}
/*[clinic input]
_overlapped.Overlapped.getresult
wait: BOOL(c_default='FALSE') = False
/
Retrieve result of operation.
If wait is true then it blocks until the operation is finished. If wait
is false and the operation is still pending then an error is raised.
[clinic start generated code]*/
static PyObject *
_overlapped_Overlapped_getresult_impl(OverlappedObject *self, BOOL wait)
/*[clinic end generated code: output=8c9bd04d08994f6c input=aa5b03e9897ca074]*/
{
DWORD transferred = 0;
BOOL ret;
DWORD err;
PyObject *addr;
if (self->type == TYPE_NONE) {
PyErr_SetString(PyExc_ValueError, "operation not yet attempted");
return NULL;
}
if (self->type == TYPE_NOT_STARTED) {
PyErr_SetString(PyExc_ValueError, "operation failed to start");
return NULL;
}
Py_BEGIN_ALLOW_THREADS
ret = GetOverlappedResult(self->handle, &self->overlapped, &transferred,
wait);
Py_END_ALLOW_THREADS
self->error = err = ret ? ERROR_SUCCESS : GetLastError();
switch (err) {
case ERROR_SUCCESS:
case ERROR_MORE_DATA:
break;
case ERROR_BROKEN_PIPE:
if (self->type == TYPE_READ || self->type == TYPE_READINTO) {
break;
}
else if (self->type == TYPE_READ_FROM &&
(self->read_from.result != NULL ||
self->read_from.allocated_buffer != NULL))
{
break;
}
else if (self->type == TYPE_READ_FROM_INTO &&
self->read_from_into.result != NULL)
{
break;
}
_Py_FALLTHROUGH;
default:
return SetFromWindowsErr(err);
}
switch (self->type) {
case TYPE_READ:
assert(PyBytes_CheckExact(self->allocated_buffer));
if (transferred != PyBytes_GET_SIZE(self->allocated_buffer) &&
_PyBytes_Resize(&self->allocated_buffer, transferred))
return NULL;
return Py_NewRef(self->allocated_buffer);
case TYPE_READ_FROM:
assert(PyBytes_CheckExact(self->read_from.allocated_buffer));
if (transferred != PyBytes_GET_SIZE(
self->read_from.allocated_buffer) &&
_PyBytes_Resize(&self->read_from.allocated_buffer, transferred))
{
return NULL;
}
// unparse the address
addr = unparse_address((SOCKADDR*)&self->read_from.address,
self->read_from.address_length);
if (addr == NULL) {
return NULL;
}
// The result is a two item tuple: (message, address)
self->read_from.result = PyTuple_New(2);
if (self->read_from.result == NULL) {
Py_CLEAR(addr);
return NULL;
}
// first item: message
PyTuple_SET_ITEM(self->read_from.result, 0,
Py_NewRef(self->read_from.allocated_buffer));
// second item: address
PyTuple_SET_ITEM(self->read_from.result, 1, addr);
return Py_NewRef(self->read_from.result);
case TYPE_READ_FROM_INTO:
// unparse the address
addr = unparse_address((SOCKADDR*)&self->read_from_into.address,
self->read_from_into.address_length);
if (addr == NULL) {
return NULL;
}
// The result is a two item tuple: (number of bytes read, address)
self->read_from_into.result = PyTuple_New(2);
if (self->read_from_into.result == NULL) {
Py_CLEAR(addr);
return NULL;
}
// first item: number of bytes read
PyTuple_SET_ITEM(self->read_from_into.result, 0,
PyLong_FromUnsignedLong((unsigned long)transferred));
// second item: address
PyTuple_SET_ITEM(self->read_from_into.result, 1, addr);
return Py_NewRef(self->read_from_into.result);
default:
return PyLong_FromUnsignedLong((unsigned long) transferred);
}
}
static PyObject *
do_ReadFile(OverlappedObject *self, HANDLE handle,