Re: x terminal from a z/OS USS host

In a recent note, John R. Grout said:

Date: Thu, 29 Jun 2006 23:00:59 -0400

Paul Gilmartin <gilmap@xxxxxxxxxxxxxxxx> writes:
xterm is available from:
ftp://invisible-island.net/xterm/xterm.tar.gz

Note that a sysprog must install this because
xterm must be setuid root to use USS terminal
resources. Our sysprog installed this port

Not in my experience. When I run the above xterm
as a non-superuser the only failure is of an attempt
to update the utmp data base. Xterm ignores this and
operates regardless as a terminal emulator, but certain
functions such as "who" produce incorrect results.

I may have (I don't recall) have hacked it to make the
utmp failure nonfatal, but I believe not.

Other OSs have a hack whereby if the utmp services are
called by a non-superuser, they invoke a su program to
perform the operation. OS/390 had not. I attempted to
report this deficiency as a bug; IBM support was not
much affected.

Caveat: We're a development and test shop; we may
generally have privileges beyond the mode for a
production shop. But is there a PARMLIB or RACF
option controlling the ability of general users to
use PTY services which our sysprog may have toggled?

but removed it after noticing that it was a
resource hog.

There are useful workarounds for z/OS xterm.
If you have a full blown X Windows server
on your desktop, it has its own xterms. You

No, xterm is a client, not generally to be found as
a function of a server. Some (commercial) products
may bundle both clients and server, but absence of
clients does not mean a server as such is not "full
blown".

can add USS host(s) with "xhost +" commands
on your server, rlogin to USS from its xterms
and set DISPLAY to the IP address and window
number of your X server.

I'm confused. On which system do you set DISPLAY and
run the xterm client? It would seem to be the USS
system, yet you advance this as an alternative in the
absence of a USS xterm client.

-- gil
--
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