Hello, I've worked around this using:

my $true=1;
ioctl($ioioio, 0x8004667e, \$true);
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And then reading data with

sysread()
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rather than <>. I haven't messed around with select() because this seems to work, although your mileage may vary.(Also, for the record, the IO::Handle::blocking() method suggested in #292856 fails but returns an empty $!.) Hope this helps, -jc