Re: Serial Terminal used for Reboot of Linux

[Paul Gilmartin]

On 2020-06-03, at 11:47:06, Mauro Souza wrote:
> 
> He needs a 3270 emulator (c3270 is fine for this) and the username and
> password for the VM guest. Putty does not understand the 3270 protocol.
> 
> Mauro
> http://mauro.limeiratem.com - registered Linux User: 294521
> Scripture is both history, and a love letter from God.
>  
Will that suffice if he wants to see the startup messages?
I tried https://www.google.com/search?q=rdp

... with Intel desktop and Intel guest.  Didn't quite work.

Somehow he needs to make the guest recognize a remote console.

> Em qua., 3 de jun. de 2020 às 14:07, Davis, Larry (National VM Capability 
> escreveu:
> 
>> I have a Linux admin that wants a Linux Terminal to reboot the Linux
>> server and view the reboot, but when they login through Putty using Line
>> mode Telnet to VM and login to the Linux server they are not able to send
>> any commands or type anything on the screen
>> 
>> Am I missing anything in the PUTTY setup that is preventing Input to the
>> VM guest?
>> 
>> Larry Davis
>> Senior z/VM systems Architect, Enterprise Services
>> T +1.813.394.4240
>> DXC Technology dxc.technology

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Serial Terminal used for Reboot of Linux

[Paul Gilmartin]

On 2020-06-06, at 13:34:43, Mark Post wrote:
> 
> On 6/3/20 5:03 PM, Alan Altmark wrote:
>> You can use linemode telnet to VM, no problem, and putty supports it.  No 
>> 3270 flow.
> 
> I've had problems with trying to do this. Things like providing input to
> the WAKEUP module, or doing *anything* after a failed IPL command:
> .ipl 160 clear^M
> HCPVMI232E IPL UNIT ERROR; IRB 00404017 0010 0020 0080
> HCPGIR450W CP entered; disabled wait PSW 000E 0232
> ^M^M^M
> 
> At this point, I can't do anything except do a "logon here" from an
> x3270 session. If I do that, then IPL CMS, and disconnect from the x3270
> session, I was hoping my line mode telnet session would be working
> again. But, it wasn't.
> 
> Any ideas on just what problem(s) I'm running into here? Pointers to
> documentation on how to get things working?
>  
Does it help to start here?:
https://www.google.com/search?q=linux+serial+console
Linux Serial Console. You must compile serial support into the kernel and not 
as a module. It is possible to specify multiple devices for console output. You 
can define a new kernel command line option to select which device(s) to use 
for console output.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Cisco Tetration alternatives

[Paul Gilmartin]

On 2020-08-13, at 00:03:24, David Boyes wrote:
>
> Tetration ...
>
??? https://en.wikipedia.org/wiki/Tetration

... Really?  I suppose this can be the next step beyond the
prevalent colloquial misuse of "exponential".

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Cisco Tetration alternatives

[Paul Gilmartin]

On 2020-08-14, at 04:30:43, Joe Monk wrote:
>
> And dont forget, the universal sensors are still there which work on any
> linux flavor.
>
zSeries?  Raspberry Pi?

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: where to search for s390x workers for ci.debian.net?

[Paul Gilmartin]

On 2020-10-05, at 13:41:09, Paul Gevers  wrote:
> 
> [Please CC on reply, I'm not subscribed to this list.]
>  
So far, I've seen you get two replies with no Cc:.  I believe
you can fnd them in the Archives, URL below.  I believe no
subscription is required.

-- gil

> --
> For LINUX-390 subscribe / signoff / archive access instructions,
> send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
> http://www2.marist.edu/htbin/wlvindex?LINUX-390

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Modify ifcfg-encw0.0.nnnn at DR

[Paul Gilmartin]

On 2020-10-07, at 08:26:14, Duane Beyer wrote:
> 
> Shift ^   works on most emulators.   (Shift 6)
>  
Errr... Then how does one grep for a line beginning with 'C'?

(In OMVS it's (by default) '¢C'.)


> -Original Message-
> From: Frank M. Ramaekers
> Sent: Wednesday, October 7, 2020 9:40 AM
> 
> Thanks...ah, how to stop a ping w/o Ctrl-C?  (z/VM console of zLinux)

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: RHEL 8.3 install stuck

[Paul Gilmartin]

On 2020-12-08, at 10:58:50, Rich Smrcina wrote:
> 
> 
>   
Your mailer or your configurartion is broken.  All I see in my
viewr is the Velocity logo .gif because that's the favored
alternative:

Content-Type: multipart/alternative; 
boundary="Apple-Mail=_3439DD11-BC64-4EFF-94A6-D98C6E4EF03A"

--Apple-Mail=_3439DD11-BC64-4EFF-94A6-D98C6E4EF03A
Content-Transfer-Encoding: quoted-printable
Content-Type: text/plain;
charset=utf-8

...

--Apple-Mail=_3439DD11-BC64-4EFF-94A6-D98C6E4EF03A
Content-Transfer-Encoding: base64
Content-Disposition: inline;
filename=velologo.gif
Content-Type: image/gif;

[]

--Apple-Mail=_3439DD11-BC64-4EFF-94A6-D98C6E4EF03A--

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Running SLES9 on z14 under zVM 6.4

[Paul Gilmartin]

> On 2020-12-08, at 14:12:21, Bruce Hayden wrote:
>
> z/VM doesn't hide the hardware.  In just about all cases, if it won't run
> in an LPAR, it also won't run under z/VM.
>
I recall a counterexample was OpenSolaris.  It wouldn't run in
an LPAR, but only under VM.  I suspect the matter was not "hid[ing]
the hardware" but required CP services not available from the hardware.

And CMS?  I understand modern CMS will not run in an LPAR but
will run under VM.

> ... I'm sure SLES 9 since it is so
> old starts up in ESA/390 mode and then switches to z/Architecture mode (64
> bit.)  The z14 doesn't support ESA/390 mode for Linux, so SLES 9 will not
> IPL in an LPAR or under z/VM.  I'm not sure what level of z/VM you are on
> now, but you can test it by shutting down Linux, entering SET MACHINE Z,
> and then trying to IPL it.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: RHEL 8.3 install stuck

[Paul Gilmartin]

On 2020-12-09, at 13:54:34, David Boyes wrote:
> 
> Update your phone to the current IOS. This is a known bug in IOS 14 GA.
>  
'Tain't no phone; 'twas MacOS Mojave.

> You'd think after a while, they'd quit fooling with their MIME 
> implementation. Ain't broke, don't fix it.
>  
Rich's message contains:
X-Mailer: Apple Mail (2.3445.104.17) (mystery to me)
iOS 14.2 (the latest) has:
X-Mailer: iPhone Mail (18B92)
MacOS Mojave (however obsolescent) has:
X-Mailer: Apple Mail (2.3445.104.17)

Regardless, using:
Content-Type: multipart/alternative; ...

and making one alternative the text payload and the other the
vendor logo is just plain wrong; MIME violation.

And iOS 14.2 shows the same problem.

MacOS Snow Leopard provided a "View; Next Alternative".
I miss it for seeing bad MIME content.

> On 12/8/20, 1:20 PM, Paul Gilmartin wrote:
> 
>Your mailer or your configurartion is broken.  All I see in my
>viewr is the Velocity logo .gif because that's the favored
>alternative:

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: SLES 15 SP2 kernel issue with random number generator (crng)

[Paul Gilmartin]

On 2020-12-18, at 10:25:49, Berthold Gunreben wrote:
> 
> on what hardware do you operate? There is several possibilities to
> consider, the easiest would be if you got a z15, because there is a RNG
> in the CPU there. ...
>  
Described in:
www.redbooks.ibm.com/redbooks/pdfs/sg248851.pdf

• 􏰀  Pseudo-Random Number Generator (PRNG),
Deterministic Random Number Generation (DRNG), and
True Random Number Generation (TRNG) for cryptographic key 
generation.

Interesting.  Does /dev/random use it?  Which?

Apparently a DRNG is a PRNG with a ramdom (unlikely to repeat) seed.
What does the z15 DRNG use for that seed?

How is the TRNG implemented?  Noise from a hot diode?  Radioactive decay?
Counting photons from a beam splitter?  Other (specify)?  Trade secret?

Thanks,
gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: SYSASCII Console for Linux images

[Paul Gilmartin]

On 2021-03-02, at 09:38:54, Dave Jones wrote:
>
> I wonder how hard it would be for z/VM to emulate, or virtualize, a
> VT220 type terminal?
>
In days of yore, there was a hardware solution.  The 3174(?)
Asynchronous Emulation Adapter.  I don't remember the configuration
I tried, but it made an (independent vendor) 3278 behave remarkably
like a VT-220.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: SYSASCII Console for Linux images

[Paul Gilmartin]

On 2021-03-02, at 11:18:25, Fred Shaheen wrote:
>
>
> The ASCII controller was the 7171, developed by Dr. Wehrle's team in the
> Glendale Lab in the 1980's.
>
I believe that was a successor and embedded the "Yale ASCII" which
was based on an IBM Series 1 minicomputer.  Those provided the
hardware base for IND$FILE and Columbia Kermit, which switched
modes with a valid but improbable sequence of 3278 control
bytes.

I believe the 3174 AEA was different.  But it may have embedded
7171 firmware.

> My car pool buddy at the time, Tom Murphy Jr. (the other Tom Murphy for
> those of you in VM) was the lead
> developer on that box.


> From: Paul Gilmartin
> Date: 03/02/2021 12:07 PM
>
> On 2021-03-02, at 09:38:54, Dave Jones wrote:
>>
>> I wonder how hard it would be for z/VM to emulate, or virtualize, a
>> VT220 type terminal?
>>
> In days of yore, there was a hardware solution.  The 3174(?)
> Asynchronous Emulation Adapter.  I don't remember the configuration
> I tried, but it made an (independent vendor) 3278 behave remarkably
> like a VT-220.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: SYSASCII Console for Linux images

[Paul Gilmartin]

On 2021-03-02, at 17:48:48, Jim Elliott wrote:
> 
> There was a product called the Yale IUP and later product version the 7171
> Device Attachment Control Unit which "converted" ASCII displays (like the
> IBM 3101) into 3270 protocol devices.
>  
> Later there was the 3174 Controller
> with the Asynchronous Emulator Adapter (AEA) which is what I think you are
> referring to, and it also emulated 3278 on ASCII.
> 
It went both ways.  According to:

http://bitsavers.trailing-edge.com/pdf/ibm/3174/ZZ25-8524-0_3174_Asynchronous_Emulation_Adapter_Feature_Nov87.pdf

 IBM Internal Use Only
Introduction
Terminology
The 3174 Asynchronous Emulation Adapter (ABA) feature and Release 3 micro- code 
provide the customer with increased connectivity by allowing the customer to:

• Use an ASCII device to communicate with an ASCII host

• Use an ASCII device to communicate with an IBM host

• Use a 3270 device to communicate with an ASCII host
^

• Use a 3270 CUT device in MLT (Multiple Logical Terminal) mode to have 
multiple sessions with ASCII and IBM hosts.

I once tried the configuration I highlighted.  Not very useful
to me since I had a real ASCII device on my desk.  But the
emulation was surprisingly faithful.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: No Linux here

[Paul Gilmartin]

On 2021-04-26, at 09:35:26, Phil Smith III wrote:
>
> Oops, forgot the list doesn't do images. See
>
> https://i.imgur.com/QwXcPDr.jpeg
>
Interesting.  Your earlier post to LISTSERV:
file:///private/tmp/paulgilm/wlvtype%3FLINUX-VM.97234.html
... appears as unrendered base64 plus some headers I'd normally
not expect to see.  If I scrape and decode the base64 I see
the image.

On an IMAP server, MacOS Mail.app renders the image apparently as
intended.  iOS 14.2.2 shows a blank page.

I suspect Microsoft Outlook 16.0 created a minor structural error
which various viewers treat differently.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: Running SLES9 on z14 under zVM 6.4

[Paul Gilmartin]

On Oct 15, 2021, at 21:38:15, David Boyes  wrote
> 
> On 12/8/20, 5:42 PM, "Linux on 390 Port on behalf of Paul Gilmartin" 
> > z/VM doesn't hide the hardware.  In just about all cases, if it won't run
>> in an LPAR, it also won't run under z/VM.
>I recall a counterexample was OpenSolaris.  It wouldn't run in
>an LPAR, but only under VM.  I suspect the matter was not "hid[ing]
>the hardware" but required CP services not available from the hardware.
>  
Did I say that?  How long ago?  (What's that date in ISO-8601 format?)
I've long known that OpenSolaris required VM.  Maybe there was more context.

-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: unsubscribe

[Paul Gilmartin]

On Oct 24, 2021, at 04:18:11, Ricardo Lee wrote:
> 
Try: 


-- gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: zLinux 3270 console support

[Paul Gilmartin]

On 11/13/22 19:49:56, Donald Russell wrote:

...
But the other problem occurs when the console is disconnected/reconnected
and the geometry is different. (A very likely scenario as everybody has
their favorite settings. I generally use 60 X 140)

I can detect when a reconnect event happens, but there needs to be a way to
tell the kernel/driver “check the geometry and adjust accordingly”.


CMS, at least, handles this magnificently.  I can be in a full screen XEDIT
session, disconnect my terminal (emulator) then reconnect with a different
geometry.  XEDIT refreshes the screen correctly.

I can't change geometry without disconnecting, but that may be a limitation
of the terminal emulator.


One thing lost by using 3270 support - can’t spool the console. That’s a
different problem for a different thread. 😀
 

In CMS, my terminal is spooled.  When I enter a full screen application
(XEDIT) spooling is suspended. when I return to 3215 emulation, spooling
continues.  This probably depends on CMS making CP aware of the transition.

You might run c3270 under a "script" pty

and everything would be captured to ./typescript including 3270 data
streams.  You probably don't want that.

--
gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390

Re: zLinux 3270 console support

[Paul Gilmartin]

On 11/14/22 14:11:21, Alan Altmark wrote:

...
2. Linux doesn't detect a reconnect event, so it doesn't know to re-query the 
device and adjust any 'views' that have been created.


Is it a basic limitation of UNIX that there's no way to connect a descriptor
to a running process?  How does XEDIT->CMS->CP do it?  I suspect the console
is never disconnected, just put in a dormant state.  I believe when I
reconnect with a different geometry XEDIT fields an I/O error and causes a
WSF Query to be issued and processes the result.

SIGHUP?  SIGTSTP?  SIGWINCH?  IIRC, I modified a SIGGWINCH handler long ago,
in a curses application.  I think I caught the signal, queried the terminal
geometry, and updated some global variables.

TSO can't deal with it.  An endless sequence of I/O errors and ops needs
to cancel the session.

--
gil

--
For LINUX-390 subscribe / signoff / archive access instructions,
send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit
http://www2.marist.edu/htbin/wlvindex?LINUX-390