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From: barrett@jhunix.HCF.JHU.EDU (Dan Barrett)
Newsgroups: comp.unix.ultrix,comp.terminals.tty5620
Subject: Re: DMD 5620 software hosted from an Ultrix DECStation or Vaxen?
Message-ID: <7418@jhunix.HCF.JHU.EDU>
Date: 25 Jan 91 22:41:16 GMT
References: <1991Jan24.235646.28577@jarvis.csri.toronto.edu>
Followup-To: comp.unix.ultrix
Organization: The Johns Hopkins University - HCF
Lines: 71

In article <1991Jan24.235646.28577@jarvis.csri.toronto.edu> cks@hawkwind.utcs.toronto.edu (Chris Siebenmann) writes:
> I know that this undoubtedly far far far out in left field, but does
>anyone have a port of the DMD 5620 software (32ld, 3cc, etc) that runs
>on an Ultrix DECStation or Vaxen?

	We did it.  Here's a summary that I saved.  This was done
on an Ultrix 2.0 VAX 8530.  The actual files are not easily accessible
so I can't send them.
----------------------------------------------------------------------------
Files modified (backups in brackets):

/usr/src/local/DMD/mpx/mpx.c		[mpx.c.orig?]
/usr/src/sys/sys/tty_pty.c		[tty_pty.c.orig]
/usr/src/sys/data/tty_pty_data.c	[tty_pty_data.c.orig]
/usr/sys/data/tty_pty_data.c		[tty_pty_data.c.orig]
/usr/sys/BINARY.vax/tty_pty.o		[tty_pty.o.orig]
/usr/sys/CRABCAKE/tty_pty.o linked to ../BINARY.vax/tty_pty.o
	(not really a change...)
/vmunix					[/vmunix.orig]


Files added:

/usr/src/sys/h/jioctl.h 


Here is the way things went...

1) We took a copy of the current tty_pty.c and added the DMD stuff
using #ifdef DMD/#endif's.  Nothing exiting in the driver was changed,
we only added more code.  In particular we added the flag for PF_DMD,
some initialization in ptyopen() and some new ioctl flags in
ptyioctl().  We also had to add a field to the tty structure,
but because of the way Ultrix is set up for binary, that info is
in the tty_pty_data.c

2) We modified tty_pty_data.c.  Besides the change to the structure
we also had it include the jioctl.h file (which we took from the
DMD/mpx/uts/sys or io directory).  We put the jioctl.h file in
/usr/src/sys/h.  We also put the #define DMD 1 in this file.

3) The data files appear also in /usr/sys/data, so we copied it
there.

4) Now we had to make the system.  We did the config, make depend and
make vmunix.  However, the make is geared for the binary distribution
so it didn't realize that the tty_pty.c had to be re-compiled.  We
went to the /usr/src/sys/sys directory and tried to do a make, but
it was looking for ../BINARY.vax files or something else that was
in the /usr/sys directory.  After trying lots of things, we finally
just made a symbolic link of /usr/sys/sys <==> /usr/src/sys/sys.
Then we did a "make tty_pty.c", then did the normal vmunix stuff
and it all worked. We moved /vmunix to /vmunix.orig, installed the
new vmunix, did a shutdown -r and it all seemed to work.  (Before
we put the new vmunix in we did a shutdown -r to see if the auto-reboot
would work.)

5) Then we went to work on mpx.  It worked the first time except
that it didn't add the user to the utmp file (the ttyxx!mpx entry).
What it turns out happended is that the mpx code had the format
for the OLD style /etc/ttys built in and on Ultrix the ttys file
is a new format.  We hacked the code from ttyslot and put it into
mpx and everybody was happy.

                                                        Dan

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