Xref: utzoo comp.sys.tandy:705 comp.unix.xenix:2074
Path: utzoo!mnetor!uunet!cbmvax!vu-vlsi!devon!paul
From: paul@devon.UUCP (Paul Sutcliffe Jr.)
Newsgroups: comp.sys.tandy,comp.unix.xenix
Subject: Yet Another Bug in Tandy Xenix/68k 3.2
Message-ID: <754@devon.UUCP>
Date: 20 Apr 88 16:39:14 GMT
Distribution: na
Organization: Devon Computer Services, Lancaster, PA
Lines: 52
Keywords: bug Tandy Xenix 3.2 init

I have uncovered (I think) another Tandy Xenix 3.2 bug:

The 3.2 /etc/init allows one to (quoting from the man page:) "specify
an alternate getty program in the /etc/inittab [sic(*)] file."  Okay, so I
have /etc/mygetty that I want to run on tty01 and tty02.  For reasons I shall
not explain here, one of the mygetty's needs an argument; the other doesn't.
Also quoting the man page (referring to the inittab file): "The fourth field
contains the name of the alternate getty program for that terminal, and an
optional space and argument."

[ (*) sic because it isn't *real* inittab file syntax.  :-( ]

So, here is what I had /etc/inittab saying:

0:01::/etc/mygetty foobar
0:02::/etc/mygetty

Well, when init starts up the two mygetty's, guess what:

$ ps -ft 01 -t 02
    UID   PID  PPID  C   STIME TTY  TIME COMMAND
   root  8980     1  0 12:06:52 01  0:00 -3 foobar
   root  8981     1  0 12:06:52 02  0:00 -4 foobar
$

Both mygettys are handed the "optional argument!"  I tried reversing the
order of the two lines in the inittab file, but the same thing occurred.
My 'solution' was to change inittab to say:

0:01::/etc/mygetty foobar
0:02::/etc/mygetty 0

and then handle the argument processing this way (mygetty.c code fragment):

	char *lname = NULL;
	...
	if (argc > 2)
		lname = *++argv;
	...
	if (lname != NULL && *lname != '0' && ...)
			  ^^^^^^^^^^^^^^^^

This works, but doesn't explain why /etc/init is munging the handling
of its inittab file.

- paul

-- 
Paul Sutcliffe, Jr.				       +----------------------+
						       |  THINK ...           |
UUCP (smart):  paul@devon.UUCP			       |            or THWIM  |
UUCP (dumb):   ...rutgers!bpa!vu-vlsi!devon!paul       +----------------------+