1 files changed, 42 insertions, 25 deletions

diff --git a/src/corelib/plugin/quuid.cpp b/src/corelib/plugin/quuid.cpp
index 6c1b6e7..983d249 100644
--- a/src/corelib/plugin/quuid.cpp
+++ b/src/corelib/plugin/quuid.cpp
@@ -582,48 +582,65 @@ QT_BEGIN_INCLUDE_NAMESPACE
 #include <stdlib.h> // for RAND_MAX
 QT_END_INCLUDE_NAMESPACE
 
+#if !defined(QT_BOOTSTRAPPED) && defined(Q_OS_UNIX)
+Q_GLOBAL_STATIC(QThreadStorage<QFile *>, devUrandomStorage);
+#endif
+
 QUuid QUuid::createUuid()
 {
     QUuid result;
     uint *data = &(result.data1);
 
-#ifdef Q_OS_UNIX
-    QFile devUrandom;
-    devUrandom.setFileName(QLatin1String("/dev/urandom"));
-    if (devUrandom.open(QIODevice::ReadOnly)) {
-        qint64 numToRead = 4 * sizeof(uint);
-        devUrandom.read((char *) data, numToRead); // should read 128-bits of data
+#if defined(Q_OS_UNIX)
+    QFile *devUrandom;
+#  if !defined(QT_BOOTSTRAPPED)
+    devUrandom = devUrandomStorage()->localData();
+    if (!devUrandom) {
+        devUrandom = new QFile(QLatin1String("/dev/urandom"));
+        devUrandom->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
+        devUrandomStorage()->setLocalData(devUrandom);
+    }
+# else
+    QFile file(QLatin1String("/dev/urandom"));
+    devUrandom = &file;
+    devUrandom->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
+# endif
+    enum { AmountToRead = 4 * sizeof(uint) };
+    if (devUrandom->isOpen()
+        && devUrandom->read((char *) data, AmountToRead) == AmountToRead) {
+        // we got what we wanted, nothing more to do
+        ;
     } else
 #endif
     {
         static const int intbits = sizeof(int)*8;
         static int randbits = 0;
         if (!randbits) {
-        int r = 0;
+            int r = 0;
             int max = RAND_MAX;
             do { ++r; } while ((max=max>>1));
             randbits = r;
         }
 
-    // Seed the PRNG once per thread with a combination of current time, a
-    // stack address and a serial counter (since thread stack addresses are
-    // re-used).
+        // Seed the PRNG once per thread with a combination of current time, a
+        // stack address and a serial counter (since thread stack addresses are
+        // re-used).
 #ifndef QT_BOOTSTRAPPED
-    static QThreadStorage<int *> uuidseed;
-    if (!uuidseed.hasLocalData())
-    {
-        int *pseed = new int;
-        static QBasicAtomicInt serial = Q_BASIC_ATOMIC_INITIALIZER(2);
-        qsrand(*pseed = QDateTime::currentDateTime().toTime_t()
-                        + quintptr(&pseed)
-                        + serial.fetchAndAddRelaxed(1));
-        uuidseed.setLocalData(pseed);
-    }
+        static QThreadStorage<int *> uuidseed;
+        if (!uuidseed.hasLocalData())
+        {
+            int *pseed = new int;
+            static QBasicAtomicInt serial = Q_BASIC_ATOMIC_INITIALIZER(2);
+            qsrand(*pseed = QDateTime::currentDateTime().toTime_t()
+                   + quintptr(&pseed)
+                   + serial.fetchAndAddRelaxed(1));
+            uuidseed.setLocalData(pseed);
+        }
 #else
-    static bool seeded = false;
-    if (!seeded)
-        qsrand(QDateTime::currentDateTime().toTime_t()
-               + quintptr(&seeded));
+        static bool seeded = false;
+        if (!seeded)
+            qsrand(QDateTime::currentDateTime().toTime_t()
+                   + quintptr(&seeded));
 #endif
 
         int chunks = 16 / sizeof(uint);
@@ -631,7 +648,7 @@ QUuid QUuid::createUuid()
             uint randNumber = 0;
             for (int filled = 0; filled < intbits; filled += randbits)
                 randNumber |= qrand()<<filled;
-             *(data+chunks) = randNumber;
+            *(data+chunks) = randNumber;
         }
     }