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The Linux SCSI Generic (sg) HOWTO
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7.4. poll()

poll(struct pollfd *ufds, unsigned int nfds, int timeout). 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.

For file descriptors associated with sg devices:

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).

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