1 files changed, 106 insertions, 0 deletions
diff --git a/src/corelib/kernel/qcore_unix.cpp b/src/corelib/kernel/qcore_unix.cpp
new file mode 100644
index 0000000000..834f05b208
--- /dev/null
+++ b/src/corelib/kernel/qcore_unix.cpp
@@ -0,0 +1,106 @@
+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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 timeval *tv, const struct timeval &start,
+                               const struct timeval &timeout)
+{
+    if (!QElapsedTimer::isMonotonic()) {
+        // we cannot recalculate the timeout without a monotonic clock as the time may have changed
+        return false;
+    }
+
+    // clock source is monotonic, so we can recalculate how much timeout is left
+    struct timeval 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 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 = qt_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)) {
+            // timeout during update
+            // or clock reset, fake timeout error
+            return 0;
+        }
+    }
+}
+
+QT_END_NAMESPACE