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/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. For further
** information use the contact form at http://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 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcore_unix_p.h"
#include "qelapsedtimer.h"
#ifdef Q_OS_NACL
#elif !defined (Q_OS_VXWORKS)
# if !defined(Q_OS_HPUX) || defined(__ia64)
# include <sys/select.h>
# endif
# include <sys/time.h>
#else
# include <selectLib.h>
#endif
#include <stdlib.h>
#ifdef Q_OS_MAC
#include <mach/mach_time.h>
#endif
QT_BEGIN_NAMESPACE
static inline bool time_update(struct timespec *tv, const struct timespec &start,
const struct timespec &timeout)
{
// clock source is (hopefully) monotonic, so we can recalculate how much timeout is left;
// if it isn't monotonic, we'll simply hope that it hasn't jumped, because we have no alternative
struct timespec now = qt_gettime();
*tv = timeout + start - now;
return tv->tv_sec >= 0;
}
int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
const struct timespec *orig_timeout)
{
if (!orig_timeout) {
// no timeout -> block forever
int ret;
EINTR_LOOP(ret, select(nfds, fdread, fdwrite, fdexcept, 0));
return ret;
}
timespec start = qt_gettime();
timespec timeout = *orig_timeout;
// loop and recalculate the timeout as needed
int ret;
forever {
#ifndef Q_OS_QNX
ret = ::pselect(nfds, fdread, fdwrite, fdexcept, &timeout, 0);
#else
timeval timeoutVal;
timeoutVal.tv_sec = timeout.tv_sec;
timeoutVal.tv_usec = timeout.tv_nsec / 1000;
ret = ::select(nfds, fdread, fdwrite, fdexcept, &timeoutVal);
#endif
if (ret != -1 || errno != EINTR)
return ret;
// recalculate the timeout
if (!time_update(&timeout, start, *orig_timeout)) {
// timeout during update
// or clock reset, fake timeout error
return 0;
}
}
}
int qt_select_msecs(int nfds, fd_set *fdread, fd_set *fdwrite, int timeout)
{
if (timeout < 0)
return qt_safe_select(nfds, fdread, fdwrite, 0, 0);
struct timespec tv;
tv.tv_sec = timeout / 1000;
tv.tv_nsec = (timeout % 1000) * 1000 * 1000;
return qt_safe_select(nfds, fdread, fdwrite, 0, &tv);
}
QT_END_NAMESPACE
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