diff --git a/src/libs/utils/archive.cpp b/src/libs/utils/archive.cpp
index 0f0b9ef4d22..02be93b006e 100644
--- a/src/libs/utils/archive.cpp
+++ b/src/libs/utils/archive.cpp
@@ -260,7 +260,6 @@ Archive *Archive::unarchive(const FilePath &src, const FilePath &dest)
         : CommandLine{tool->executable, tool->arguments};
     archive->m_process->setCommand(cmd);
     archive->m_process->setWorkingDirectory(workingDirectory);
-    archive->m_process->setOpenMode(QProcess::ReadOnly);
     archive->m_process->start();
     return archive;
 }
diff --git a/src/libs/utils/qtcprocess.cpp b/src/libs/utils/qtcprocess.cpp
index 722dae998d2..9c7b12d67fd 100644
--- a/src/libs/utils/qtcprocess.cpp
+++ b/src/libs/utils/qtcprocess.cpp
@@ -116,7 +116,6 @@ public:
     virtual void kill() = 0;
     virtual void close() = 0;
     virtual qint64 write(const QByteArray &data) = 0;
-    virtual void closeWriteChannel() = 0;
 
     virtual void setStandardInputFile(const QString &fileName) = 0;
     virtual void setProcessChannelMode(QProcess::ProcessChannelMode mode) = 0;
@@ -230,8 +229,6 @@ public:
     { m_process.close(); }
     qint64 write(const QByteArray &data) override
     { return m_process.write(data); }
-    void closeWriteChannel() override
-    { m_process.closeWriteChannel(); }
 
     void setStandardInputFile(const QString &fileName) override
     { m_process.setStandardInputFile(fileName); }
@@ -327,7 +324,6 @@ public:
     void kill() override { cancel(); } // TODO: see above
     void close() override { cancel(); } // TODO: see above
     qint64 write(const QByteArray &data) override { return m_handle->write(data); }
-    void closeWriteChannel() override { /*QTC_CHECK(false);*/ }
 
     void setStandardInputFile(const QString &fileName) override { m_handle->setStandardInputFile(fileName); }
     void setProcessChannelMode(QProcess::ProcessChannelMode mode) override { m_handle->setProcessChannelMode(mode); }
@@ -433,8 +429,6 @@ public:
     bool m_haveEnv = false;
     bool m_useCtrlCStub = false;
 
-    QProcess::OpenMode m_openMode = QProcess::ReadWrite;
-
     void slotTimeout();
     void slotFinished(int exitCode, QProcess::ExitStatus e);
     void slotError(QProcess::ProcessError);
@@ -458,7 +452,6 @@ public:
     bool m_timeOutMessageBoxEnabled = false;
     bool m_waitingForUser = false;
     bool m_processUserEvents = false;
-    bool m_keepStdInOpen = false;
 };
 
 void QtcProcessPrivate::clearForRun()
@@ -512,6 +505,11 @@ QtcProcess::~QtcProcess()
     delete d;
 }
 
+ProcessMode QtcProcess::processMode() const
+{
+    return d->m_processMode;
+}
+
 void QtcProcess::setEnvironment(const Environment &env)
 {
     d->m_environment = env;
@@ -582,14 +580,6 @@ void QtcProcess::start()
 {
     d->clearForRun();
 
-    if (!d->m_writeData.isEmpty()) {
-        connect(d->m_process, &ProcessInterface::started, this, [this] {
-            const qint64 bytesWritten = write(d->m_writeData);
-            QTC_CHECK(bytesWritten == d->m_writeData.size());
-            closeWriteChannel(); // FIXME: Is this good?
-        });
-    }
-
     if (d->m_commandLine.executable().needsDevice()) {
         QTC_ASSERT(s_deviceHooks.startProcessHook, return);
         s_deviceHooks.startProcessHook(*this);
@@ -708,16 +698,6 @@ void QtcProcess::setDisableUnixTerminal()
     d->m_process->setDisableUnixTerminal();
 }
 
-void QtcProcess::setKeepWriteChannelOpen()
-{
-    d->m_keepStdInOpen = true;
-}
-
-bool QtcProcess::keepsWriteChannelOpen() const
-{
-    return d->m_keepStdInOpen;
-}
-
 void QtcProcess::setStandardInputFile(const QString &inputFile)
 {
     d->m_process->setStandardInputFile(inputFile);
@@ -728,11 +708,6 @@ void QtcProcess::setRemoteProcessHooks(const DeviceProcessHooks &hooks)
     s_deviceHooks = hooks;
 }
 
-void QtcProcess::setOpenMode(QIODevice::OpenMode mode)
-{
-    d->m_openMode = mode;
-}
-
 bool QtcProcess::stopProcess()
 {
     if (state() == QProcess::NotRunning)
@@ -1004,14 +979,10 @@ void QtcProcess::kill()
 
 qint64 QtcProcess::write(const QByteArray &input)
 {
+    QTC_ASSERT(processMode() == ProcessMode::Writer, return -1);
     return d->m_process->write(input);
 }
 
-void QtcProcess::closeWriteChannel()
-{
-    d->m_process->closeWriteChannel();
-}
-
 void QtcProcess::close()
 {
     d->m_process->close();
@@ -1251,7 +1222,6 @@ void QtcProcess::setExitCodeInterpreter(const ExitCodeInterpreter &interpreter)
 void QtcProcess::setWriteData(const QByteArray &writeData)
 {
     d->m_writeData = writeData;
-    setKeepWriteChannelOpen();
 }
 
 #ifdef QT_GUI_LIB
@@ -1276,13 +1246,6 @@ void QtcProcess::runBlocking()
     ExecuteOnDestruction logResult([this] { qCDebug(processLog) << *this; });
 
     if (d->m_processUserEvents) {
-        if (!d->m_writeData.isEmpty()) {
-            connect(d->m_process, &ProcessInterface::started, this, [this] {
-                write(d->m_writeData);
-                closeWriteChannel();
-            });
-        }
-        setOpenMode(d->m_writeData.isEmpty() ? QIODevice::ReadOnly : QIODevice::ReadWrite);
         QtcProcess::start();
 
         // On Windows, start failure is triggered immediately if the
@@ -1305,13 +1268,11 @@ void QtcProcess::runBlocking()
 #endif
         }
     } else {
-        setOpenMode(QIODevice::ReadOnly);
         QtcProcess::start();
         if (!waitForStarted(d->m_maxHangTimerCount * 1000)) {
             d->m_result = QtcProcess::StartFailed;
             return;
         }
-        closeWriteChannel();
         if (!waitForFinished(d->m_maxHangTimerCount * 1000)) {
             d->m_result = QtcProcess::Hang;
             terminate();
diff --git a/src/libs/utils/qtcprocess.h b/src/libs/utils/qtcprocess.h
index bf9fd445a2b..8fbe8926dda 100644
--- a/src/libs/utils/qtcprocess.h
+++ b/src/libs/utils/qtcprocess.h
@@ -70,6 +70,8 @@ public:
     QtcProcess(QObject *parent = nullptr);
     ~QtcProcess();
 
+    ProcessMode processMode() const;
+
     enum Result {
         // Finished successfully. Unless an ExitCodeInterpreter is set
         // this corresponds to a return code 0.
@@ -131,8 +133,6 @@ public:
 
     static void setRemoteProcessHooks(const DeviceProcessHooks &hooks);
 
-    void setOpenMode(QIODevice::OpenMode mode);
-
     bool stopProcess();
     bool readDataFromProcess(int timeoutS, QByteArray *stdOut, QByteArray *stdErr,
                              bool showTimeOutMessageBox);
@@ -185,12 +185,8 @@ public:
     void kill();
 
     qint64 write(const QByteArray &input);
-    void closeWriteChannel();
     void close();
 
-    void setKeepWriteChannelOpen();
-    bool keepsWriteChannelOpen() const;
-
     void setStandardInputFile(const QString &inputFile);
 
 signals:
diff --git a/src/plugins/android/androidsdkmanager.cpp b/src/plugins/android/androidsdkmanager.cpp
index 18bed57f2d4..246b528f1e6 100644
--- a/src/plugins/android/androidsdkmanager.cpp
+++ b/src/plugins/android/androidsdkmanager.cpp
@@ -1041,7 +1041,7 @@ void AndroidSdkManagerPrivate::getPendingLicense(SdkCmdFutureInterface &fi)
     fi.setProgressValue(0);
     AndroidSdkManager::OperationOutput result;
     result.type = AndroidSdkManager::LicenseWorkflow;
-    QtcProcess licenseCommand;
+    QtcProcess licenseCommand(ProcessMode::Writer);
     licenseCommand.setEnvironment(AndroidConfigurations::toolsEnvironment(m_config));
     bool reviewingLicenses = false;
     licenseCommand.setCommand(CommandLine(m_config.sdkManagerToolPath(), {"--licenses", sdkRootArg(m_config)}));
diff --git a/src/plugins/coreplugin/externaltool.cpp b/src/plugins/coreplugin/externaltool.cpp
index c4829423a58..0232fe3dcfe 100644
--- a/src/plugins/coreplugin/externaltool.cpp
+++ b/src/plugins/coreplugin/externaltool.cpp
@@ -653,7 +653,6 @@ void ExternalToolRunner::run()
         }
     }
     m_process = new QtcProcess(this);
-    connect(m_process, &QtcProcess::started, this, &ExternalToolRunner::started);
     connect(m_process, &QtcProcess::finished, this, &ExternalToolRunner::finished);
     connect(m_process, &QtcProcess::errorOccurred, this, &ExternalToolRunner::error);
     connect(m_process, &QtcProcess::readyReadStandardOutput,
@@ -669,14 +668,9 @@ void ExternalToolRunner::run()
                            ? QOverload<const QString &>::of(MessageManager::writeDisrupting)
                            : QOverload<const QString &>::of(MessageManager::writeSilently);
     write(tr("Starting external tool \"%1\"").arg(cmd.toUserOutput()));
-    m_process->start();
-}
-
-void ExternalToolRunner::started()
-{
     if (!m_resolvedInput.isEmpty())
-        m_process->write(m_resolvedInput.toLocal8Bit());
-    m_process->closeWriteChannel();
+        m_process->setWriteData(m_resolvedInput.toLocal8Bit());
+    m_process->start();
 }
 
 void ExternalToolRunner::finished()
diff --git a/src/plugins/coreplugin/externaltool.h b/src/plugins/coreplugin/externaltool.h
index 8d21afa4eca..d7584e9cf91 100644
--- a/src/plugins/coreplugin/externaltool.h
+++ b/src/plugins/coreplugin/externaltool.h
@@ -134,7 +134,6 @@ public:
     QString errorString() const;
 
 private:
-    void started();
     void finished();
     void error(QProcess::ProcessError error);
     void readStandardOutput();
diff --git a/src/plugins/coreplugin/locator/executefilter.cpp b/src/plugins/coreplugin/locator/executefilter.cpp
index 54f7c29cfab..ed93f0eb980 100644
--- a/src/plugins/coreplugin/locator/executefilter.cpp
+++ b/src/plugins/coreplugin/locator/executefilter.cpp
@@ -176,7 +176,6 @@ void ExecuteFilter::runHeadCommand()
         m_process->setWorkingDirectory(d.workingDirectory);
         m_process->setCommand({fullPath, d.arguments, Utils::CommandLine::Raw});
         m_process->start();
-        m_process->closeWriteChannel();
         if (!m_process->waitForStarted(1000)) {
             MessageManager::writeFlashing(
                 tr("Could not start process: %1.").arg(m_process->errorString()));
diff --git a/src/plugins/coreplugin/locator/spotlightlocatorfilter.cpp b/src/plugins/coreplugin/locator/spotlightlocatorfilter.cpp
index 84ecaa762f7..901647e4855 100644
--- a/src/plugins/coreplugin/locator/spotlightlocatorfilter.cpp
+++ b/src/plugins/coreplugin/locator/spotlightlocatorfilter.cpp
@@ -109,7 +109,6 @@ SpotlightIterator::SpotlightIterator(const QStringList &command)
             scheduleKillProcess();
         m_waitForItems.wakeAll();
     });
-    m_process->setOpenMode(QIODevice::ReadOnly);
     m_process->start();
 }
 
diff --git a/src/plugins/coreplugin/patchtool.cpp b/src/plugins/coreplugin/patchtool.cpp
index 288e9d5dd52..4e43d6d5ea6 100644
--- a/src/plugins/coreplugin/patchtool.cpp
+++ b/src/plugins/coreplugin/patchtool.cpp
@@ -105,6 +105,7 @@ static bool runPatchHelper(const QByteArray &input, const QString &workingDirect
                  QDir::toNativeSeparators(patch),
                  args.join(QLatin1Char(' '))));
     patchProcess.setCommand({patch, args});
+    patchProcess.setWriteData(input);
     patchProcess.start();
     if (!patchProcess.waitForStarted()) {
         MessageManager::writeFlashing(
@@ -113,10 +114,6 @@ static bool runPatchHelper(const QByteArray &input, const QString &workingDirect
         return false;
     }
 
-
-    patchProcess.write(input);
-    patchProcess.closeWriteChannel();
-
     QByteArray stdOut;
     QByteArray stdErr;
     if (!patchProcess.readDataFromProcess(30, &stdOut, &stdErr, true)) {
diff --git a/src/plugins/debugger/cdb/cdbengine.cpp b/src/plugins/debugger/cdb/cdbengine.cpp
index b920b69d0c2..c7f508fd7f6 100644
--- a/src/plugins/debugger/cdb/cdbengine.cpp
+++ b/src/plugins/debugger/cdb/cdbengine.cpp
@@ -179,6 +179,7 @@ void addCdbOptionPages(QList<Core::IOptionsPage *> *opts)
 #define QT_CREATOR_CDB_EXT "qtcreatorcdbext"
 
 CdbEngine::CdbEngine() :
+    m_process(ProcessMode::Writer),
     m_tokenPrefix("<token>"),
     m_extensionCommandPrefix("!" QT_CREATOR_CDB_EXT ".")
 {
diff --git a/src/plugins/debugger/debuggersourcepathmappingwidget.cpp b/src/plugins/debugger/debuggersourcepathmappingwidget.cpp
index 92858969ec3..4929f40c0a3 100644
--- a/src/plugins/debugger/debuggersourcepathmappingwidget.cpp
+++ b/src/plugins/debugger/debuggersourcepathmappingwidget.cpp
@@ -451,7 +451,6 @@ static QString findQtInstallPath(const FilePath &qmakePath)
            qPrintable(proc.errorString()));
         return QString();
     }
-    proc.closeWriteChannel();
     if (!proc.waitForFinished()) {
         proc.stopProcess();
         qWarning("%s: Timeout running '%s'.", Q_FUNC_INFO, qPrintable(qmakePath.toString()));
diff --git a/src/plugins/debugger/gdb/gdbengine.cpp b/src/plugins/debugger/gdb/gdbengine.cpp
index f5de9c91dc3..b8354a28752 100644
--- a/src/plugins/debugger/gdb/gdbengine.cpp
+++ b/src/plugins/debugger/gdb/gdbengine.cpp
@@ -145,6 +145,7 @@ const char tracepointCapturePropertyName[] = "GDB.TracepointCapture";
 ///////////////////////////////////////////////////////////////////////
 
 GdbEngine::GdbEngine()
+    : m_gdbProc(ProcessMode::Writer)
 {
     setObjectName("GdbEngine");
     setDebuggerName("GDB");
@@ -3851,7 +3852,6 @@ void GdbEngine::setupEngine()
     if (rp.debugger.workingDirectory.isDir())
         m_gdbProc.setWorkingDirectory(rp.debugger.workingDirectory);
     m_gdbProc.setEnvironment(gdbEnv);
-    m_gdbProc.setKeepWriteChannelOpen();
     m_gdbProc.start();
 
     if (!m_gdbProc.waitForStarted()) {
diff --git a/src/plugins/debugger/lldb/lldbengine.cpp b/src/plugins/debugger/lldb/lldbengine.cpp
index 232be2161c3..a340f6103ea 100644
--- a/src/plugins/debugger/lldb/lldbengine.cpp
+++ b/src/plugins/debugger/lldb/lldbengine.cpp
@@ -82,6 +82,7 @@ static int &currentToken()
 ///////////////////////////////////////////////////////////////////////
 
 LldbEngine::LldbEngine()
+    : m_lldbProc(ProcessMode::Writer)
 {
     setObjectName("LldbEngine");
     setDebuggerName("LLDB");
diff --git a/src/plugins/docker/dockerdevice.cpp b/src/plugins/docker/dockerdevice.cpp
index d10e74c9bd4..e968cfb8524 100644
--- a/src/plugins/docker/dockerdevice.cpp
+++ b/src/plugins/docker/dockerdevice.cpp
@@ -122,6 +122,7 @@ private:
 DockerDeviceProcess::DockerDeviceProcess(const QSharedPointer<const IDevice> &device,
                                            QObject *parent)
     : DeviceProcess(device, parent)
+    , m_process(ProcessMode::Writer)
 {
 }
 
@@ -1449,7 +1450,7 @@ void DockerDevice::runProcess(QtcProcess &process) const
     CommandLine cmd{"docker", {"exec"}};
     if (!workingDir.isEmpty())
         cmd.addArgs({"-w", workingDir.path()});
-    if (process.keepsWriteChannelOpen())
+    if (process.processMode() == ProcessMode::Writer)
         cmd.addArg("-i");
     if (env.size() != 0 && d->m_accessible != DockerDevicePrivate::Accessible) {
         process.unsetEnvironment();
diff --git a/src/plugins/git/gerrit/gerritmodel.cpp b/src/plugins/git/gerrit/gerritmodel.cpp
index 7290addf99d..836ed55fd13 100644
--- a/src/plugins/git/gerrit/gerritmodel.cpp
+++ b/src/plugins/git/gerrit/gerritmodel.cpp
@@ -325,7 +325,6 @@ void QueryContext::start()
     m_timer.start();
     m_process.setCommand({m_binary, m_arguments});
     m_process.start();
-    m_process.closeWriteChannel();
 }
 
 void QueryContext::errorTermination(const QString &msg)
diff --git a/src/plugins/git/gerrit/gerritplugin.cpp b/src/plugins/git/gerrit/gerritplugin.cpp
index 8a4b2b03673..fbb95fa1623 100644
--- a/src/plugins/git/gerrit/gerritplugin.cpp
+++ b/src/plugins/git/gerrit/gerritplugin.cpp
@@ -150,7 +150,6 @@ FetchContext::FetchContext(const QSharedPointer<GerritChange> &change,
     m_watcher.setFuture(m_progress.future());
     m_process.setWorkingDirectory(repository);
     m_process.setEnvironment(GitClient::instance()->processEnvironment());
-    m_process.closeWriteChannel();
 }
 
 FetchContext::~FetchContext()
@@ -173,7 +172,6 @@ void FetchContext::start()
     VcsBase::VcsOutputWindow::appendCommand(m_repository.toString(), {m_git, args});
     m_process.setCommand({m_git, args});
     m_process.start();
-    m_process.closeWriteChannel();
 }
 
 void FetchContext::processFinished()
diff --git a/src/plugins/languageclient/languageclientinterface.cpp b/src/plugins/languageclient/languageclientinterface.cpp
index 99a9c0d41bd..affd0fa7266 100644
--- a/src/plugins/languageclient/languageclientinterface.cpp
+++ b/src/plugins/languageclient/languageclientinterface.cpp
@@ -88,6 +88,7 @@ void BaseClientInterface::parseData(const QByteArray &data)
 }
 
 StdIOClientInterface::StdIOClientInterface()
+    : m_process(ProcessMode::Writer)
 {
     connect(&m_process, &QtcProcess::readyReadStandardError,
             this, &StdIOClientInterface::readError);
diff --git a/src/plugins/perforce/perforcechecker.cpp b/src/plugins/perforce/perforcechecker.cpp
index 796b8152ac9..6c1c7f2f003 100644
--- a/src/plugins/perforce/perforcechecker.cpp
+++ b/src/plugins/perforce/perforcechecker.cpp
@@ -91,7 +91,6 @@ void PerforceChecker::start(const QString &binary, const QString &workingDirecto
 
     m_process.setCommand({m_binary, args});
     m_process.start();
-    m_process.closeWriteChannel();
     // Timeout handling
     m_timeOutMS = timeoutMS;
     m_timedOut = false;
diff --git a/src/plugins/perforce/perforceplugin.cpp b/src/plugins/perforce/perforceplugin.cpp
index 04c05515c9a..0cc78e5df4e 100644
--- a/src/plugins/perforce/perforceplugin.cpp
+++ b/src/plugins/perforce/perforceplugin.cpp
@@ -1310,26 +1310,14 @@ PerforceResponse PerforcePluginPrivate::fullySynchronousProcess(const QString &w
 
     PerforceResponse response;
     process.setCommand({m_settings.p4BinaryPath.value(), args});
+    process.setWriteData(stdInput);
     process.start();
-    if (stdInput.isEmpty())
-        process.closeWriteChannel();
 
     if (!process.waitForStarted(3000)) {
         response.error = true;
         response.message = msgNotStarted(m_settings.p4BinaryPath.value());
         return response;
     }
-    if (!stdInput.isEmpty()) {
-        if (process.write(stdInput) == -1) {
-            process.stopProcess();
-            response.error = true;
-            response.message = tr("Unable to write input data to process %1: %2").
-                               arg(QDir::toNativeSeparators(m_settings.p4BinaryPath.value()),
-                                   process.errorString());
-            return response;
-        }
-        process.closeWriteChannel();
-    }
 
     QByteArray stdOut;
     QByteArray stdErr;
diff --git a/src/plugins/projectexplorer/applicationlauncher.cpp b/src/plugins/projectexplorer/applicationlauncher.cpp
index 4cc2bd8c730..42ac99d5df4 100644
--- a/src/plugins/projectexplorer/applicationlauncher.cpp
+++ b/src/plugins/projectexplorer/applicationlauncher.cpp
@@ -402,7 +402,6 @@ void ApplicationLauncherPrivate::start(const Runnable &runnable, const IDevice::
             m_consoleProcess.start();
         } else {
             m_guiProcess.setCommand(cmdLine);
-            m_guiProcess.closeWriteChannel();
             m_guiProcess.start();
         }
     } else {
diff --git a/src/plugins/projectexplorer/devicesupport/desktopdeviceprocess.cpp b/src/plugins/projectexplorer/devicesupport/desktopdeviceprocess.cpp
index 532dfc524ff..86cd26cf303 100644
--- a/src/plugins/projectexplorer/devicesupport/desktopdeviceprocess.cpp
+++ b/src/plugins/projectexplorer/devicesupport/desktopdeviceprocess.cpp
@@ -40,6 +40,7 @@ namespace Internal {
 DesktopDeviceProcess::DesktopDeviceProcess(const QSharedPointer<const IDevice> &device,
                                            QObject *parent)
     : DeviceProcess(device, parent)
+    , m_process(ProcessMode::Writer)
 {
     connect(&m_process, &QtcProcess::errorOccurred, this, &DeviceProcess::error);
     connect(&m_process, &QtcProcess::finished, this, &DeviceProcess::finished);
diff --git a/src/plugins/qtsupport/baseqtversion.cpp b/src/plugins/qtsupport/baseqtversion.cpp
index 037d602297c..52c08767004 100644
--- a/src/plugins/qtsupport/baseqtversion.cpp
+++ b/src/plugins/qtsupport/baseqtversion.cpp
@@ -1795,7 +1795,6 @@ static QByteArray runQmakeQuery(const FilePath &binary, const Environment &env,
 
     QtcProcess process;
     process.setEnvironment(env);
-    process.setOpenMode(QIODevice::ReadOnly);
     process.setCommand({binary, {"-query"}});
     process.start();
 
diff --git a/src/plugins/vcsbase/vcsbasesubmiteditor.cpp b/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
index b18d11183c4..bf8d538616d 100644
--- a/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
+++ b/src/plugins/vcsbase/vcsbasesubmiteditor.cpp
@@ -662,7 +662,6 @@ bool VcsBaseSubmitEditor::runSubmitMessageCheckScript(const QString &checkScript
         checkProcess.setWorkingDirectory(d->m_checkScriptWorkingDirectory);
     checkProcess.setCommand({checkScript, {saver.filePath().toString()}});
     checkProcess.start();
-    checkProcess.closeWriteChannel();
     if (!checkProcess.waitForStarted()) {
         *errorMessage = tr("The check script \"%1\" could not be started: %2").arg(checkScript, checkProcess.errorString());
         return false;