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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Qt Software Information (qt-info@nokia.com)
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcore_unix_p.h"
#include <sys/select.h>
#include <sys/time.h>
#include <stdlib.h>
#include "qeventdispatcher_unix_p.h" // for the timeval operators
#if !defined(QT_NO_CLOCK_MONOTONIC)
# if defined(QT_BOOTSTRAPPED)
# define QT_NO_CLOCK_MONOTONIC
# endif
#endif
QT_BEGIN_NAMESPACE
static inline timeval gettime()
{
timeval tv;
#ifndef QT_NO_CLOCK_MONOTONIC
// use the monotonic clock
static volatile bool monotonicClockDisabled = false;
struct timespec ts;
if (!monotonicClockDisabled) {
if (clock_gettime(CLOCK_MONOTONIC, &ts) == -1) {
monotonicClockDisabled = true;
} else {
tv.tv_sec = ts.tv_sec;
tv.tv_usec = ts.tv_nsec / 1000;
return tv;
}
}
#endif
// use gettimeofday
::gettimeofday(&tv, 0);
return tv;
}
static inline bool time_update(struct timeval *tv, const struct timeval &start,
const struct timeval &timeout)
{
struct timeval now = gettime();
if (now < start) {
// clock reset, give up
return false;
}
*tv = timeout + start - now;
return true;
}
int qt_safe_select(int nfds, fd_set *fdread, fd_set *fdwrite, fd_set *fdexcept,
const struct timeval *orig_timeout)
{
if (!orig_timeout) {
// no timeout -> block forever
register int ret;
EINTR_LOOP(ret, select(nfds, fdread, fdwrite, fdexcept, 0));
return ret;
}
timeval start = gettime();
timeval timeout = *orig_timeout;
// loop and recalculate the timeout as needed
int ret;
forever {
ret = ::select(nfds, fdread, fdwrite, fdexcept, &timeout);
if (ret != -1 || errno != EINTR)
return ret;
// recalculate the timeout
if (!time_update(&timeout, start, *orig_timeout)) {
// clock reset, fake timeout error
return 0;
}
}
}
QT_END_NAMESPACE
#ifdef Q_OS_LINUX
// Don't wait for libc to supply the calls we need
// Make syscalls directly
# if defined(__GLIBC__) && (__GLIBC__ * 0x100 + __GLIBC_MINOR__) >= 0x0204
// glibc 2.4 has syscall(...)
# include <sys/syscall.h>
# include <asm/unistd.h>
# else
// no syscall(...)
static inline int syscall(...) { errno = ENOSYS; return -1;}
# endif
# ifndef __NR_dup3
# if defined(__i386__)
# define __NR_dup3 330
# define __NR_pipe2 331
# elif defined(__x86_64__)
# define __NR_dup3 292
# define __NR_pipe2 293
# elif defined(__ia64__)
# define __NR_dup3 1316
# define __NR_pipe2 1317
# else
// set the syscalls to absurd numbers so that they'll cause ENOSYS errors
# warning "Please port the pipe2/dup3 code to this platform"
# define __NR_dup3 -1
# define __NR_pipe2 -1
# endif
# endif
# if !defined(__NR_socketcall) && !defined(__NR_accept4)
# if defined(__x86_64__)
# define __NR_accept4 288
# elif defined(__ia64__)
// not assigned yet to IA-64
# define __NR_accept4 -1
# else
// set the syscalls to absurd numbers so that they'll cause ENOSYS errors
# warning "Please port the accept4 code to this platform"
# define __NR_accept4 -1
# endif
# endif
QT_BEGIN_NAMESPACE
namespace QtLibcSupplement {
int pipe2(int pipes[], int flags)
{
return syscall(__NR_pipe2, pipes, flags);
}
int dup3(int oldfd, int newfd, int flags)
{
return syscall(__NR_dup3, oldfd, newfd, flags);
}
int accept4(int s, sockaddr *addr, QT_SOCKLEN_T *addrlen, int flags)
{
# if defined(__NR_socketcall)
// This platform uses socketcall() instead of raw syscalls
// the SYS_ACCEPT4 number is cross-platform: 18
return syscall(__NR_socketcall, 18, &s);
# else
return syscall(__NR_accept4, s, addr, addrlen, flags);
# endif
Q_UNUSED(addr); Q_UNUSED(addrlen); Q_UNUSED(flags); // they're actually used
}
}
QT_END_NAMESPACE
#endif // Q_OS_LINUX
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