qt 6.5.1 original

tests/auto/other/qprocess_and_guieventloop/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## tst_qprocess_and_guieventloop Test:
+#####################################################################
+
+qt_internal_add_test(tst_qprocess_and_guieventloop
+    SOURCES
+        tst_qprocess_and_guieventloop.cpp
+    LIBRARIES
+        Qt::Gui
+)
+add_subdirectory(write-read-write)

tests/auto/other/qprocess_and_guieventloop/tst_qprocess_and_guieventloop.cpp

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+// Copyright (C) 2021 The Qt Company Ltd.
+// Copyright (C) 2016 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <QtGui/QGuiApplication>
+#include <QTest>
+#include <QSignalSpy>
+#include <QtCore/QProcess>
+
+class tst_QProcess_and_GuiEventLoop : public QObject
+{
+    Q_OBJECT
+private slots:
+    void waitForAndEventLoop();
+};
+
+
+void tst_QProcess_and_GuiEventLoop::waitForAndEventLoop()
+{
+#ifdef Q_OS_ANDROID
+    QSKIP("Not supported on Android");
+#else
+
+    // based on testcase provided in QTBUG-39488
+    QByteArray msg = "Hello World";
+
+    QProcess process;
+    process.start("write-read-write/write-read-write", QStringList() << msg);
+    QVERIFY(process.waitForStarted(5000));
+    QVERIFY(process.waitForReadyRead(5000));
+    QCOMPARE(process.readAll().trimmed(), msg);
+
+    // run the GUI event dispatcher once
+    QSignalSpy spy(&process, SIGNAL(readyRead()));
+    qApp->processEvents(QEventLoop::AllEvents, 100);
+
+    // we mustn't have read anything in the event loop
+    QCOMPARE(spy.size(), 0);
+
+    // ensure the process hasn't died
+    QVERIFY(!process.waitForFinished(250));
+
+    // we mustn't have read anything during waitForFinished either
+    QCOMPARE(spy.size(), 0);
+
+    // release the child for the second write
+    process.write("\n");
+    QVERIFY(process.waitForFinished(5000));
+    QCOMPARE(int(process.exitStatus()), int(QProcess::NormalExit));
+    QCOMPARE(process.exitCode(), 0);
+    QCOMPARE(spy.size(), 1);
+    QCOMPARE(process.readAll().trimmed(), msg);
+#endif
+}
+
+QTEST_MAIN(tst_QProcess_and_GuiEventLoop)
+
+#include "tst_qprocess_and_guieventloop.moc"

tests/auto/other/qprocess_and_guieventloop/write-read-write/CMakeLists.txt

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+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+#####################################################################
+## write-read-write Binary:
+#####################################################################
+
+qt_internal_add_executable(write-read-write
+    OUTPUT_DIRECTORY "${CMAKE_CURRENT_BINARY_DIR}/"
+    SOURCES
+        main.cpp
+)

tests/auto/other/qprocess_and_guieventloop/write-read-write/main.cpp

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+// Copyright (C) 2016 Intel Corporation.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include <stdio.h>
+
+int main(int, char **argv)
+{
+    const char *msg = argv[1];
+    char buf[2];
+
+    puts(msg);
+    fflush(stdout);
+
+    // wait for a newline
+    const char *result = fgets(buf, sizeof buf, stdin);
+    if (result != buf)
+        return -1;
+
+    puts(msg);
+    fflush(stdout);
+    return 0;
+}