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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the documentation of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the Technology Preview License Agreement accompanying
** this package.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights.  These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/

//! [0]
QNativeSocketEngine socketLayer;
socketLayer.initialize(QAbstractSocket::TcpSocket, QAbstractSocket::IPv4Protocol);
socketLayer.connectToHost(QHostAddress::LocalHost, 22);
// returns false

socketLayer.waitForWrite();
socketLayer.connectToHost(QHostAddress::LocalHost, 22);
// returns true
//! [0]


//! [1]
QNativeSocketEngine socketLayer;
socketLayer.bind(QHostAddress::Any, 4000);
socketLayer.listen();
if (socketLayer.waitForRead()) {
    int clientSocket = socketLayer.accept();
    // a client is connected
}
//! [1]
generated by cgit v0.12 at 2025-08-19 20:11:46 (GMT)
/span> i = 0; /* locals and stack */ for (; i <frame->stacktop; i++) { Py_VISIT(locals[i]); } return 0; } PyFrameObject * _PyFrame_MakeAndSetFrameObject(_PyInterpreterFrame *frame) { assert(frame->frame_obj == NULL); PyObject *exc = PyErr_GetRaisedException(); PyFrameObject *f = _PyFrame_New_NoTrack(_PyFrame_GetCode(frame)); if (f == NULL) { Py_XDECREF(exc); return NULL; } PyErr_SetRaisedException(exc); if (frame->frame_obj) { // GH-97002: How did we get into this horrible situation? Most likely, // allocating f triggered a GC collection, which ran some code that // *also* created the same frame... while we were in the middle of // creating it! See test_sneaky_frame_object in test_frame.py for a // concrete example. // // Regardless, just throw f away and use that frame instead, since it's // already been exposed to user code. It's actually a bit tricky to do // this, since we aren't backed by a real _PyInterpreterFrame anymore. // Just pretend that we have an owned, cleared frame so frame_dealloc // doesn't make the situation worse: f->f_frame = (_PyInterpreterFrame *)f->_f_frame_data; f->f_frame->owner = FRAME_CLEARED; f->f_frame->frame_obj = f; Py_DECREF(f); return frame->frame_obj; } assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT); assert(frame->owner != FRAME_CLEARED); f->f_frame = frame; frame->frame_obj = f; return f; } void _PyFrame_Copy(_PyInterpreterFrame *src, _PyInterpreterFrame *dest) { assert(src->stacktop >= _PyFrame_GetCode(src)->co_nlocalsplus); Py_ssize_t size = ((char*)&src->localsplus[src->stacktop]) - (char *)src; memcpy(dest, src, size); // Don't leave a dangling pointer to the old frame when creating generators // and coroutines: dest->previous = NULL; } static void take_ownership(PyFrameObject *f, _PyInterpreterFrame *frame) { assert(frame->owner != FRAME_OWNED_BY_CSTACK); assert(frame->owner != FRAME_OWNED_BY_FRAME_OBJECT); assert(frame->owner != FRAME_CLEARED); Py_ssize_t size = ((char*)&frame->localsplus[frame->stacktop]) - (char *)frame; Py_INCREF(_PyFrame_GetCode(frame)); memcpy((_PyInterpreterFrame *)f->_f_frame_data, frame, size); frame = (_PyInterpreterFrame *)f->_f_frame_data; f->f_frame = frame; frame->owner = FRAME_OWNED_BY_FRAME_OBJECT; if (_PyFrame_IsIncomplete(frame)) { // This may be a newly-created generator or coroutine frame. Since it's // dead anyways, just pretend that the first RESUME ran: PyCodeObject *code = _PyFrame_GetCode(frame); frame->instr_ptr = _PyCode_CODE(code) + code->_co_firsttraceable + 1; } assert(!_PyFrame_IsIncomplete(frame)); assert(f->f_back == NULL); _PyInterpreterFrame *prev = _PyFrame_GetFirstComplete(frame->previous); frame->previous = NULL; if (prev) { assert(prev->owner != FRAME_OWNED_BY_CSTACK); /* Link PyFrameObjects.f_back and remove link through _PyInterpreterFrame.previous */ PyFrameObject *back = _PyFrame_GetFrameObject(prev); if (back == NULL) { /* Memory error here. */ assert(PyErr_ExceptionMatches(PyExc_MemoryError)); /* Nothing we can do about it */ PyErr_Clear(); } else { f->f_back = (PyFrameObject *)Py_NewRef(back); } } if (!_PyObject_GC_IS_TRACKED((PyObject *)f)) { _PyObject_GC_TRACK((PyObject *)f); } } void _PyFrame_ClearExceptCode(_PyInterpreterFrame *frame) { /* It is the responsibility of the owning generator/coroutine * to have cleared the enclosing generator, if any. */ assert(frame->owner != FRAME_OWNED_BY_GENERATOR || _PyFrame_GetGenerator(frame)->gi_frame_state == FRAME_CLEARED); // GH-99729: Clearing this frame can expose the stack (via finalizers). It's // crucial that this frame has been unlinked, and is no longer visible: assert(_PyThreadState_GET()->current_frame != frame); if (frame->frame_obj) { PyFrameObject *f = frame->frame_obj; frame->frame_obj = NULL; if (Py_REFCNT(f) > 1) { take_ownership(f, frame); Py_DECREF(f); return; } Py_DECREF(f); } assert(frame->stacktop >= 0); for (int i = 0; i < frame->stacktop; i++) { Py_XDECREF(frame->localsplus[i]); } Py_XDECREF(frame->frame_obj); Py_XDECREF(frame->f_locals); Py_DECREF(frame->f_funcobj); } /* Unstable API functions */ PyObject * PyUnstable_InterpreterFrame_GetCode(struct _PyInterpreterFrame *frame) { PyObject *code = frame->f_executable; Py_INCREF(code); return code; } int PyUnstable_InterpreterFrame_GetLasti(struct _PyInterpreterFrame *frame) { return _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT); } int PyUnstable_InterpreterFrame_GetLine(_PyInterpreterFrame *frame) { int addr = _PyInterpreterFrame_LASTI(frame) * sizeof(_Py_CODEUNIT); return PyCode_Addr2Line(_PyFrame_GetCode(frame), addr); } const PyTypeObject *const PyUnstable_ExecutableKinds[PyUnstable_EXECUTABLE_KINDS+1] = { [PyUnstable_EXECUTABLE_KIND_SKIP] = &_PyNone_Type, [PyUnstable_EXECUTABLE_KIND_PY_FUNCTION] = &PyCode_Type, [PyUnstable_EXECUTABLE_KIND_BUILTIN_FUNCTION] = &PyMethod_Type, [PyUnstable_EXECUTABLE_KIND_METHOD_DESCRIPTOR] = &PyMethodDescr_Type, [PyUnstable_EXECUTABLE_KINDS] = NULL, };
generated by cgit v0.12 at 2025-08-19 20:11:46 (GMT)