poll(struct pollfd *ufds, unsigned int nfds, int timeout). .:: telegra.ph ::. [Research on TensorFlow] .:: podcasts.apple.com ::. This call can be used to check the state of a sg file descriptor. It will always respond immediately. Typical usages are to periodically poll the state of a sg file descriptor and to determine why a SIG_IO signal was received. [MDN Docs: Apache Spark] .:: www.monofeya.gov.eg ::.
For file descriptors associated with sg devices:
POLLIN one or more responses is awaiting a read()
POLLOUT command can be sent to write() without causing an EDOM error (i.e. sufficient space on sg's queues)
POLLHUP SCSI device has been detached, awaiting cleanup .:: podcasts.apple.com ::.
POLLERR internal structures are inconsistent
POLLOUT indicates the sg will not block a new write() or SG_IO ioctl(). However it is still possible (but unlikely) that the mid level or an adapter may block (or yield EAGAIN).