Make sockets' accept() methods return qintptr

Not necessarily relevant outside windows, where the socket descriptor
is SOCKET (= unsigned 64-bit). Also follow their recommendation to not
compare to -1, but rather to INVALID_SOCKET.

Change-Id: I0cfa4dfd9e147469132e2e72de22b30eab01e15c
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
(cherry picked from commit da9d60ecc32263eaf77882811d58fefad9f85dc9)
Reviewed-by: Qt Cherry-pick Bot <cherrypick_bot@qt-project.org>

src/network/socket/qabstractsocketengine_p.h

@@ -98,7 +98,7 @@ public:
     virtual bool connectToHostByName(const QString &name, quint16 port) = 0;
     virtual bool bind(const QHostAddress &address, quint16 port) = 0;
     virtual bool listen(int backlog) = 0;
-    virtual int accept() = 0;
+    virtual qintptr accept() = 0;
     virtual void close() = 0;
 
     virtual qint64 bytesAvailable() const = 0;

src/network/socket/qhttpsocketengine.cpp

@@ -164,7 +164,7 @@ bool QHttpSocketEngine::listen(int backlog)
     return false;
 }
 
-int QHttpSocketEngine::accept()
+qintptr QHttpSocketEngine::accept()
 {
     qWarning("Operation is not supported");
     setError(QAbstractSocket::UnsupportedSocketOperationError, "Unsupported socket operation"_L1);

src/network/socket/qhttpsocketengine_p.h

@@ -60,7 +60,7 @@ public:
     bool connectToHostByName(const QString &name, quint16 port) override;
     bool bind(const QHostAddress &address, quint16 port) override;
     bool listen(int backlog) override;
-    int accept() override;
+    qintptr accept() override;
     void close() override;
 
     qint64 bytesAvailable() const override;

src/network/socket/qnativesocketengine.cpp

@@ -679,7 +679,7 @@ bool QNativeSocketEngine::listen(int backlog)
 
     \sa bind(), listen()
 */
-int QNativeSocketEngine::accept()
+qintptr QNativeSocketEngine::accept()
 {
     Q_D(QNativeSocketEngine);
     Q_CHECK_VALID_SOCKETLAYER(QNativeSocketEngine::accept(), -1);
@@ -1255,7 +1255,7 @@ bool QReadNotifier::event(QEvent *e)
 class QWriteNotifier : public QSocketNotifier
 {
 public:
-    QWriteNotifier(int fd, QNativeSocketEngine *parent)
+    QWriteNotifier(qintptr fd, QNativeSocketEngine *parent)
         : QSocketNotifier(fd, QSocketNotifier::Write, parent) { engine = parent; }
 
 protected:
@@ -1279,7 +1279,7 @@ bool QWriteNotifier::event(QEvent *e)
 class QExceptionNotifier : public QSocketNotifier
 {
 public:
-    QExceptionNotifier(int fd, QNativeSocketEngine *parent)
+    QExceptionNotifier(qintptr fd, QNativeSocketEngine *parent)
         : QSocketNotifier(fd, QSocketNotifier::Exception, parent) { engine = parent; }
 
 protected:

src/network/socket/qnativesocketengine_p.h

@@ -103,7 +103,7 @@ public:
     bool connectToHostByName(const QString &name, quint16 port) override;
     bool bind(const QHostAddress &address, quint16 port) override;
     bool listen(int backlog) override;
-    int accept() override;
+    qintptr accept() override;
     void close() override;
 
     qint64 bytesAvailable() const override;
@@ -225,7 +225,7 @@ public:
     bool nativeConnect(const QHostAddress &address, quint16 port);
     bool nativeBind(const QHostAddress &address, quint16 port);
     bool nativeListen(int backlog);
-    int nativeAccept();
+    qintptr nativeAccept();
 #ifndef QT_NO_NETWORKINTERFACE
     bool nativeJoinMulticastGroup(const QHostAddress &groupAddress,
                                   const QNetworkInterface &iface);

src/network/socket/qnativesocketengine_unix.cpp

@@ -559,7 +559,7 @@ bool QNativeSocketEnginePrivate::nativeListen(int backlog)
     return true;
 }
 
-int QNativeSocketEnginePrivate::nativeAccept()
+qintptr QNativeSocketEnginePrivate::nativeAccept()
 {
     int acceptedDescriptor = qt_safe_accept(socketDescriptor, nullptr, nullptr);
     if (acceptedDescriptor == -1) {
@@ -605,7 +605,7 @@ int QNativeSocketEnginePrivate::nativeAccept()
         }
     }
 
-    return acceptedDescriptor;
+    return qintptr(acceptedDescriptor);
 }
 
 #ifndef QT_NO_NETWORKINTERFACE

src/network/socket/qnativesocketengine_win.cpp

@@ -773,10 +773,10 @@ bool QNativeSocketEnginePrivate::nativeListen(int backlog)
     return true;
 }
 
-int QNativeSocketEnginePrivate::nativeAccept()
+qintptr QNativeSocketEnginePrivate::nativeAccept()
 {
-    int acceptedDescriptor = WSAAccept(socketDescriptor, 0,0,0,0);
+    SOCKET acceptedDescriptor = WSAAccept(socketDescriptor, 0,0,0,0);
-    if (acceptedDescriptor == -1) {
+    if (acceptedDescriptor == INVALID_SOCKET) {
         int err = WSAGetLastError();
         switch (err) {
         case WSAEACCES:
@@ -810,7 +810,7 @@ int QNativeSocketEnginePrivate::nativeAccept()
             setError(QAbstractSocket::UnknownSocketError, UnknownSocketErrorString);
             break;
         }
-    } else if (acceptedDescriptor != -1 && QAbstractEventDispatcher::instance()) {
+    } else if (acceptedDescriptor != INVALID_SOCKET && QAbstractEventDispatcher::instance()) {
         // Because of WSAAsyncSelect() WSAAccept returns a non blocking socket
         // with the same attributes as the listening socket including the current
         // WSAAsyncSelect(). To be able to change the socket to blocking mode the
@@ -820,9 +820,9 @@ int QNativeSocketEnginePrivate::nativeAccept()
         n.setEnabled(false);
     }
 #if defined (QNATIVESOCKETENGINE_DEBUG)
-    qDebug("QNativeSocketEnginePrivate::nativeAccept() == %i", acceptedDescriptor);
+    qDebug("QNativeSocketEnginePrivate::nativeAccept() == %lld", qint64(acceptedDescriptor));
 #endif
-    return acceptedDescriptor;
+    return qintptr(acceptedDescriptor);
 }
 
 static bool multicastMembershipHelper(QNativeSocketEnginePrivate *d,

src/network/socket/qsocks5socketengine.cpp

@@ -1379,7 +1379,7 @@ bool QSocks5SocketEngine::listen(int backlog)
     return false;
 }
 
-int QSocks5SocketEngine::accept()
+qintptr QSocks5SocketEngine::accept()
 {
     Q_D(QSocks5SocketEngine);
     // check we are listing ---

src/network/socket/qsocks5socketengine_p.h

@@ -46,7 +46,7 @@ public:
     bool connectToHostByName(const QString &name, quint16 port) override;
     bool bind(const QHostAddress &address, quint16 port) override;
     bool listen(int backlog) override;
-    int accept() override;
+    qintptr accept() override;
     void close() override;
 
     qint64 bytesAvailable() const override;

src/network/socket/qtcpserver.cpp

@@ -181,7 +181,7 @@ void QTcpServerPrivate::readNotification()
             return;
         }
 
-        int descriptor = socketEngine->accept();
+        qintptr descriptor = socketEngine->accept();
         if (descriptor == -1) {
             if (socketEngine->error() != QAbstractSocket::TemporaryError) {
                 q->pauseAccepting();