C++ (Qt)
bool QFSFileEngine::open(QIODevice::OpenMode openMode)
{
    Q_D(QFSFileEngine);
    if (d->filePath.isEmpty()) {
        qWarning("QFSFileEngine::open: No file name specified");
        setError(QFile::OpenError, QLatin1String("No file name specified"));
        return false;
    }
 
    // Append implies WriteOnly.
    if (openMode & QFile::Append)
        openMode |= QFile::WriteOnly;
 
    // WriteOnly implies Truncate if neither ReadOnly nor Append are sent.
    if ((openMode & QFile::WriteOnly) && !(openMode & (QFile::ReadOnly | QFile::Append)))
        openMode |= QFile::Truncate;
 
    d->openMode = openMode;
    d->lastFlushFailed = false;
    d->tried_stat = 0;
    d->fh = 0;
    d->fd = -1;
 
    return d->nativeOpen(openMode);
}