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echo: os2prog
to: Henk den Adel
from: Vadim Bugrov
date: 1997-01-31 09:10:40
subject: redirection

Hello Henk.

Jan 27 1997 21:58, Henk den Adel wrote to All:

 HA> I am trying to de-trap an application, by writing out intermediate
 HA> results, using printf, a plain text application, using C code. The
 HA> application traps (trap 0005). Output is written to the screen. I have
 HA> no idea why my application traps and where it traps.
new stuff is only a forgotten old one?
 HA> appli  log
 HA> leaves me with a file of 0 length, whereas without redirection:
 HA> appli < input
 HA> results are written to the screen.
do you know about file buffering? and about caching? it is an understandable
result you describe...
 HA> When i open a stream and write my intermediate info to this stream,
 HA> the streamed file is empty as well, as a result of the trapping.
of course, nobody flushes it, nobody closes it too.
 HA> So how can i redirect my info (printf) to a file, when the program
 HA> traps?
try do the same and include not-caching option when you open file for logging
and flush it always you wrote to.
 HA> I am using OS/2 version 2.1. IBMs C compiler (2.01) or Borlands C
 HA> compiler (1.0) produce the same redirection behaviour, so it must be
 HA> an intrinsic feature of the OS.
why? try WARP and compiler version 2.0!
 HA> Any idea to solve this dilemma?
if it isn't enogh try write direct to me. welcome to vadim{at}dionis.kfti.kcn.ru
for example or to 2:5049/11
I can write russian both addresses if you interest it (I do not know where is
2:286/415).

Vadim

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