usea socketpair instead of a pipe in BitTube

#include <gui/ISensorServer.h>

#include <gui/ISensorEventConnection.h>

#include <gui/SensorEventQueue.h>

#include <hardware/sensors.h>

        count = numEvents;

    }

    if (count == 0)

        return 0;

    ssize_t size = mChannel->write(scratch, count*sizeof(sensors_event_t));

    // NOTE: ASensorEvent and sensors_event_t are the same type

    ssize_t size = SensorEventQueue::write(mChannel,

            reinterpret_cast<ASensorEvent const*>(scratch), count);

    if (size == -EAGAIN) {

        // the destination doesn't accept events anymore, it's probably

        // full. For now, we just drop the events on the floor.

        return size;

    }

    //ALOGE_IF(size<0, "dropping %d events on the floor (%s)",

    //        count, strerror(-size));

    return size < 0 ? status_t(size) : status_t(NO_ERROR);

}