/****************************************************************************
**
** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/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.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QCORE_UNIX_P_H
#define QCORE_UNIX_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists for the convenience
// of Qt code on Unix. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include "qplatformdefs.h"

#ifndef Q_OS_UNIX
# error "qcore_unix_p.h included on a non-Unix system"
#endif

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>

#include <errno.h>
#include <fcntl.h>

#define EINTR_LOOP(var, cmd)                    \
    do {                                        \
        var = cmd;                              \
    } while (var == -1 && errno == EINTR)

QT_BEGIN_NAMESPACE

// don't call QT_OPEN or ::open
// call qt_safe_open
static inline int qt_safe_open(const char *pathname, int flags, mode_t mode = 0777)
{
#ifdef O_CLOEXEC
    flags |= O_CLOEXEC;
#endif
    register int fd;
    EINTR_LOOP(fd, QT_OPEN(pathname, flags, mode));

    // unknown flags are ignored, so we have no way of verifying if
    // O_CLOEXEC was accepted
    if (fd != -1)
        ::fcntl(fd, F_SETFD, FD_CLOEXEC);
    return fd;
}
#undef QT_OPEN
#define QT_OPEN         qt_safe_open

static inline qint64 qt_safe_read(int fd, void *data, qint64 maxlen)
{
    qint64 ret = 0;
    EINTR_LOOP(ret, QT_READ(fd, data, maxlen));
    return ret;
}
#undef QT_READ
#define QT_READ qt_safe_read

static inline qint64 qt_safe_write(int fd, const void *data, qint64 len)
{
    qint64 ret = 0;
    EINTR_LOOP(ret, QT_WRITE(fd, data, len));
    return ret;
}
#undef QT_WRITE
#define QT_WRITE qt_safe_write

static inline int qt_safe_close(int fd)
{
    register int ret;
    EINTR_LOOP(ret, QT_CLOSE(fd));
    return ret;
}
#undef QT_CLOSE
#define QT_CLOSE qt_safe_close

QT_END_NAMESPACE

#endif
