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From: jfh@killer.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: /dev/stdin for 4.3?
Message-ID: <958@killer.UUCP>
Date: Thu, 4-Jun-87 12:11:25 EDT
Article-I.D.: killer.958
Posted: Thu Jun  4 12:11:25 1987
Date-Received: Sun, 7-Jun-87 18:38:40 EDT
References: <7619@brl-adm.ARPA>
Organization: The Unix(tm) Connection, Dallas, Texas
Lines: 26
Summary: A few new questions ...


I have thought about putting this in my lowly Version 7 kernel, and I want
a few questions answered.

Assuming

	int	fd;
	struct	stat	stat1, stat2;

	fd = open ("/dev/stdin", 0);

do fstat (0, &stat1) and fstat (fd, &stat2) return the same thing?  What
if _after_ the open I do a freopen (stdin, ...) or a close (0) followed
by open (somefile)?  Does this still hold true?  If memory and understanding
serve me correctly, if in System V I close all my terminal files, do a
setpgrp() and open some new terminal file - then open /dev/tty, I get the
new tty.  But what happens if I open /dev/tty before all of the closes,
do the setpgrp(), and open a new tty?  Seems to me (from what I remember
last time I looked at the source) that /dev/tty points to the _new_ tty
after the open(), not the old one since the driver gets the controlling
tty from the U-page or something like that.  HELP ME PLEASE (send manual
pages in other words ...)

- John.		(Still working on a .signature in the Big D)

Disclaimer:  I didn't do it.  Honest.