On Wed, 11 Apr 2018, Dave Horsfall wrote:
In Perl it may be necessary to run "h2ph" to convert C *.h files into the equivalent *.ph files e.g. when doing low-level stuff such as ioctl().
Sigh... Skip it; I found the answer after I had a brief nap (that happens a lot with me).
Short answer: read the Perl IO::Handle page a little more fully before posting a silly question...
-- Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."