Am 29.08.2018 um 18:25 schrieb Mark Morgan Lloyd:
On 29/08/18 16:00, Henry Vermaak wrote:
On Wed, Aug 29, 2018 at 03:01:54PM +0000, Mark Morgan Lloyd wrote:> I
think I've seen this question asked before, my apologies if this was>
recently.> > I've got two programs intended to be functionally
identical, one in Perl and> the other in FPC. They read a unix-domain
datagram, decode the message, and> emit output; if this goes to a
file then it's reasonable to monitor it using> tail -f> > Perl has a
variable that you can set to force output to be unbuffered, with> the
result that as soon as a message is output it's in the file in its>
entirety.> > Is there an equivalent for Pascal, or should I be using
something like> fpSync(stdout) at opportune times?
Does SetTextBuf() with a buffer of size 1 work? I don't think there
isanything equivalent to setvbuf(). Otherwise you'll have to Flush()
themmanually, which is a pain.
I'm a bit wary of SetTextBuf() with a preopened handle. Flush() is
actually no big deal since the program has a well-defined processing
loop... but unfortunately is less than effective.
It's something I can live with, since this is really only a test
program I knocked together to look at how clock_gettime() behaves on
different platforms (the answer being "badly" :-)
SetTextBuf() does not influence the handle itself, only the buffer of
the file/text record, so it should be safe to use.
Regards,
Sven
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