On 09/03/11 11:30, Mark Morgan Lloyd wrote:
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.
You're right. Thinking about it, I don't know what the use of an fsync
is in SerFlush, since you still don't know if it's been transmitted.
I'd consider this a bug, SerFlush should use tcdrain.
Henry
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