https://bugs.kde.org/show_bug.cgi?id=362161
--- Comment #4 from Arne <gm2....@gmail.com> ---
The problem was introduced in version 5.21.0 (which cannot be selected from the
version drop-down menu above)
The function is:
int KRandom::random()
{
static bool init = false;
if (!init) {
unsigned int seed;
init = true;
QFile urandom(QStringLiteral("/dev/urandom"));
bool opened = urandom.open(QIODevice::ReadOnly |
QIODevice::Unbuffered);
if (!opened || urandom.read(reinterpret_cast<char *>(&seed),
sizeof(seed)) != sizeof(seed)) {
// No /dev/urandom... try something else.
qsrand(getpid());
seed = qrand() + time(0);
}
qsrand(seed);
}
return rand();
}
On first call after program load, the qrand() random number generator is seeded
by the call of qsrand(seed).
However, the value returned by KRandom::random() is obtained by calling the
rand() random number generator, which has not been seeded, and thus returns
the same sequence of numbers after each re-start of the calling program.
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