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From: j@uriah.heep.sax.de (J Wunsch)
Newsgroups: comp.unix.bsd.freebsd.misc
Subject: Re: PIPE HELP!!!!
Date: 14 May 1996 23:32:15 GMT
Organization: Private BSD site, Dresden
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Message-ID: <4nb55v$20d@uriah.heep.sax.de>
References: <4n92oj$rho@monet.npi.msu.su>
Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch)
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max@gw.mics.msu.su (Maxim V. Drogajtcev) wrote:
> I have:
> 1. one programm. it's display some info (into stdout) every 2 sec.
> 2. second progamm. it's read from stdout and send it to other comp.
stdin (i guess)
Most likely, your problem is that the stdio library works line-
buffered on output if the output goes to a terminal, but switches to
fully-buffered for a non-terminal output stream. (Exception: stderr,
which is always unbuffered.) So once you pipe the output of one
program into another one, its output will become fully-buffered, and
the rather large buffer will only be flushed once it has filled (which
can, depending on your application, take up to several hours).
You can override this in the program #1 by using setvbuf(). Refer to
the man page about its usage.
--
cheers, J"org
joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE
Never trust an operating system you don't have sources for. ;-)