aeron-client/src/main/java/io/aeron/CommonContext.java
public boolean isDriverActive(final long driverTimeoutMs, final Consumer<String> logger)
    {
        final MappedByteBuffer cncByteBuffer = mapExistingCncFile(logger);
        try
        {
            return isDriverActive(driverTimeoutMs, logger, cncByteBuffer);
        }
        finally
        {
            IoUtil.unmap(cncByteBuffer);
        }
    }
public boolean isDriverActive(final long driverTimeoutMs, final Consumer<String> logger)
    {
        final MappedByteBuffer cncByteBuffer = mapExistingCncFile(logger);
        try
        {
            return isDriverActive(driverTimeoutMs, logger, cncByteBuffer);
        }
        finally
        {
            IoUtil.unmap(cncByteBuffer);
        }
    }
Is a media driver active in the current Aeron directory?

@param driverTimeoutMs for the driver liveness check.
@param logger          for feedback as liveness checked.
@return true if a driver is active or false if not.