Add getter/signal to get the render process PID

This can useful for e.g. implementing something like the "Task manager" in
Chromium or otherwise interacting with the render process (e.g. to kill it for
some reason while debugging).

[ChangeLog] Add a renderProcessPid() getter to (Q)WebEnginePage which allows
getting the process ID of the underlying render process.

Change-Id: Id5d59be9b6bd46ffc3a6aa480cb5ff7bd3b8aa31
Reviewed-by: Allan Sandfeld Jensen <allan.jensen@qt.io>

2 files changed, 21 insertions, 0 deletions

diff --git a/tests/auto/quick/publicapi/tst_publicapi.cpp b/tests/auto/quick/publicapi/tst_publicapi.cpp
index 3c97f2410..aaca7997b 100644
--- a/tests/auto/quick/publicapi/tst_publicapi.cpp
+++ b/tests/auto/quick/publicapi/tst_publicapi.cpp
@@ -741,6 +741,8 @@ static const QStringList expectedAPI = QStringList()
     << "QQuickWebEngineView.quotaRequested(QWebEngineQuotaRequest) --> void"
     << "QQuickWebEngineView.recentlyAudible --> bool"
     << "QQuickWebEngineView.recentlyAudibleChanged(bool) --> void"
+    << "QQuickWebEngineView.renderProcessPid --> qlonglong"
+    << "QQuickWebEngineView.renderProcessPidChanged(qlonglong) --> void"
     << "QQuickWebEngineView.recommendedState --> LifecycleState"
     << "QQuickWebEngineView.recommendedStateChanged(LifecycleState) --> void"
     << "QQuickWebEngineView.registerProtocolHandlerRequested(QWebEngineRegisterProtocolHandlerRequest) --> void"
diff --git a/tests/auto/widgets/qwebenginepage/tst_qwebenginepage.cpp b/tests/auto/widgets/qwebenginepage/tst_qwebenginepage.cpp
index f411f0872..9f4e422f8 100644
--- a/tests/auto/widgets/qwebenginepage/tst_qwebenginepage.cpp
+++ b/tests/auto/widgets/qwebenginepage/tst_qwebenginepage.cpp
@@ -226,6 +226,7 @@ private Q_SLOTS:
 
     void customUserAgentInNewTab();
     void renderProcessCrashed();
+    void renderProcessPid();
 
 private:
     static QPoint elementCenter(QWebEnginePage *page, const QString &id);
@@ -4358,6 +4359,24 @@ void tst_QWebEnginePage::renderProcessCrashed()
             status == QWebEnginePage::AbnormalTerminationStatus);
 }
 
+void tst_QWebEnginePage::renderProcessPid()
+{
+    QCOMPARE(m_page->renderProcessPid(), 0);
+
+    m_page->load(QUrl("about:blank"));
+    QSignalSpy spyFinished(m_page, &QWebEnginePage::loadFinished);
+    QVERIFY(spyFinished.wait());
+
+    QVERIFY(m_page->renderProcessPid() > 1);
+
+    bool crashed = false;
+    connect(m_page, &QWebEnginePage::renderProcessTerminated, [&]() { crashed = true; });
+    m_page->load(QUrl("chrome://crash"));
+    QTRY_VERIFY_WITH_TIMEOUT(crashed, 20000);
+
+    QCOMPARE(m_page->renderProcessPid(), 0);
+}
+
 static QByteArrayList params = {QByteArrayLiteral("--use-fake-device-for-media-stream")};
 W_QTEST_MAIN(tst_QWebEnginePage, params)