POLLHUP           393 libavdevice/iec61883.c     dv->raw1394_poll.events = POLLIN | POLLERR | POLLHUP | POLLPRI;
POLLHUP            75 libavformat/network.c     return ret < 0 ? ff_neterrno() : p.revents & (ev | POLLERR | POLLHUP) ? 0 : AVERROR(EAGAIN);