[fpc-pascal] (Unix) serial port handling

Mark Morgan Lloyd markMLl.fpc-pascal at telemetry.co.uk
Wed Mar 9 12:30:03 CET 2011

Henry Vermaak wrote:
> On 08/03/11 10:30, Mark Morgan Lloyd wrote:
>> Can anybody say whether there is a good reason that serial.pp lacks a
>> function to read the CD signal?
>> Is SerFlush, which calls fpfsync, intended to discard input data, output
>> data or both?
> fsync just makes sure all the in-kernel caches are written to the 
> device.  Flushing input data is just a matter of reading it.

Thanks for that Henry. Obviously there's scope for confusion here with 
the kernel's tcflush() and tcdrain() functions, where tcflush discards 
input and/or output data.

Mark Morgan Lloyd
markMLl .AT. telemetry.co .DOT. uk

[Opinions above are the author's, not those of his employers or colleagues]

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