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From: Sam Steingold <sds AT gnu DOT org>
Newsgroups: gmane.os.cygwin,comp.unix.questions
Subject: how to check stdin == stdout?
Date: 25 Jul 2002 16:38:32 -0400
Organization: disorganization
Lines: 31
Message-ID: <sa0d6tb8rw7.fsf@glip.premonitia.com>
Reply-To: sds AT gnu DOT org
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X-Disclaimer: You should not expect anyone to agree with me.
User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3.50

To check that stdin and stdout are the same TTYs,
I use the following code on UNIX (all flavors)

#define stdin_handle   0
#define stdout_handle  1

      struct stat stdin_stat;
      struct stat stdout_stat;
      if ((fstat(stdin_handle,&stdin_stat) >= 0) &&
          (fstat(stdout_handle,&stdout_stat) >= 0))
        if ((stdin_stat.st_dev == stdout_stat.st_dev) &&
            (stdin_stat.st_ino == stdout_stat.st_ino))
          same_tty = true;

it works just fine on all UNIX flavors except for cygwin which has
different inodes:

        stdin_stat.st_ino =3989447614
        stdout_stat.st_ino=3413797845

what's wrong with cygwin?
or maybe my method is incorrect?
so how do I check that 0 and 1 are the same tty?

thanks!

-- 
Sam Steingold (http://www.podval.org/~sds) running RedHat7.3 GNU/Linux
<http://www.camera.org> <http://www.iris.org.il> <http://www.memri.org/>
<http://www.mideasttruth.com/> <http://www.palestine-central.com/links.html>
Despite the raising cost of living, it remains quite popular.



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