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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qbs.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "stdinreader.h"
#include <tools/hostosinfo.h>
#include <QtCore/qfile.h>
#include <QtCore/qsocketnotifier.h>
#include <cerrno>
#include <cstring>
#ifdef Q_OS_WIN32
#include <qt_windows.h>
#include <QtCore/qtimer.h>
#else
#include <fcntl.h>
#endif
namespace qbs {
namespace Internal {
class UnixStdinReader : public StdinReader
{
public:
UnixStdinReader(QObject *parent) : StdinReader(parent), m_notifier(0, QSocketNotifier::Read) {}
private:
void start() override
{
if (!m_stdIn.open(stdin, QIODevice::ReadOnly)) {
emit errorOccurred(tr("Cannot read from standard input."));
return;
}
const auto emitError = [this] {
emit errorOccurred(tr("Failed to make standard input non-blocking: %1")
.arg(QLatin1String(std::strerror(errno))));
};
#ifdef Q_OS_UNIX
const int flags = fcntl(0, F_GETFL, 0);
if (flags == -1) {
emitError();
return;
}
if (fcntl(0, F_SETFL, flags | O_NONBLOCK)) {
emitError();
return;
}
#endif
connect(&m_notifier, &QSocketNotifier::activated, this, [this] {
emit dataAvailable(m_stdIn.readAll());
});
}
QFile m_stdIn;
QSocketNotifier m_notifier;
};
class WindowsStdinReader : public StdinReader
{
public:
WindowsStdinReader(QObject *parent) : StdinReader(parent) {}
private:
void start() override
{
#ifdef Q_OS_WIN32
m_stdinHandle = GetStdHandle(STD_INPUT_HANDLE);
if (!m_stdinHandle) {
emit errorOccurred(tr("Failed to create handle for standard input."));
return;
}
// A timer seems slightly less awful than to block in a thread
// (how would we abort that one?), but ideally we'd like
// to have a signal-based approach like in the Unix variant.
const auto timer = new QTimer(this);
connect(timer, &QTimer::timeout, this, [this] {
char buf[1024];
DWORD bytesAvail;
PeekNamedPipe(m_stdinHandle, nullptr, 0, nullptr, &bytesAvail, nullptr);
while (bytesAvail > 0) {
DWORD bytesRead;
ReadFile(m_stdinHandle, buf, std::min<DWORD>(bytesAvail, sizeof buf), &bytesRead,
nullptr);
emit dataAvailable(QByteArray(buf, bytesRead));
bytesAvail -= bytesRead;
}
});
timer->start(10);
#endif
}
#ifdef Q_OS_WIN32
HANDLE m_stdinHandle;
#endif
};
StdinReader *StdinReader::create(QObject *parent)
{
if (HostOsInfo::isWindowsHost())
return new WindowsStdinReader(parent);
return new UnixStdinReader(parent);
}
StdinReader::StdinReader(QObject *parent) : QObject(parent) { }
} // namespace Internal
} // namespace qbs
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