SG_SET_KEEP_ORPHAN 0x2287 [_GET_ 0x2288]. These ioctl()s allow the setting and reading of the "keep_orphan"
flag. This controls what happens to the request associated with a
SG_IO ioctl() that is interrupted (i.e. errno is EINTR). The
default action is to drop the response as soon as it is received.
This corresponds to the "keep_orphan" flag being 0. When the
"keep_orphan" flag is 1 then the response is transformed in such
a way that it can be fetched by a read(). This is the only
circumstance in which a request sent by a SG_IO ioctl() can have
the associated response fetched by a read().