[Octave-bug-tracker] [bug #57087] [instrument-control] tests fail on macOS for tcp/udp read/write

[Andrew Janke]

Follow-up Comment #4, bug #57087 (project octave):

Good test. I tweaked it a bit and attached an update.

In a Homebrewed Octave 5.1.0 on macOS 10.14.6:


octave:1> testselect
starting
select for 999,999 usecs ...
ok
select 1 second in secs ...
ok
select for 1,000,000 usecs ...
error: udp_read: Error while reading/select: 22 - Invalid argument
octave:1>


That's exactly what I'd expect to see if the tv_usec value was constrained to
be less than 1,000,000 on this system.

I think what needs to happen for portability is that the instrument-control
tcp_read and udp_read functions need to add logic to "carry over" tv_usec
values > 999,999 into the whole-seconds tv_sec field.

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