PORTING to IBM OS/390: select() always returning 0 in entropy.c

[Paul Anderson]

Hi,
    Thanks for you reply, I hear what your saying about /dev/urandom, I work
for IBM and I'll sugget it to the development team. I ended up using prngd
by Lutz.Jaenicke which worked fine. OpenSHH now works on my S/390 but it's a
bit flakey due to the the EBCDIC 390 talking to ASCII clients, SCP works but
will put  even binary files throught the ASCII-EBCDIC conversion.

Paul Anderson.

----- Original Message -----
From: <mouring at etoh.eviladmin.org>
To: "Paul Anderson" <paul-anderson at paul-anderson.com>
Cc: <openssh-unix-dev at mindrot.org>
Sent: Saturday, January 06, 2001 7:59 PM
Subject: Re: PORTING to IBM OS/390: select() always returning 0 in entropy.c


> On Fri, 5 Jan 2001, Paul Anderson wrote:
>
> > Hello,
> >     I'm attempting to port OpenSSH to IBM's S/390 mainframe. Things
> >have gone well but I have come a little unstuck with the internal
> >PRNG. Although the commands in ssh_prng_cmds are being executed the
> >select() seems to be returning 0 and therefore the cose is assuming that
> >the forked process has timed out. This could be a difference in the way
>
> If select() returns 0 it means that the select() timed out.  Look at your
> ssh_prng_cmds and consider increasing the number on the left handside by
> very small amounts until you hit the magical number that allows you get to
> get enough entropy.
>
> And I suggest you hound IBM to put in a /dev/urandom.
>
> that select is implemented on OS/390. The Unix environment provided by
OS/390 has many compatability levels from including several POSIX and XPG
variants. I am not a C expert and the debugegr is not very good, has anyone
come across smiliar behavior before. A description of the select() on OS/390
can be found at:
http://www.s390.ibm.com/bookmgr-cgi/bookmgr.cmd/BOOKS/EDCLB031/4%2e1%2e131?S
HELF=CBCBS031
> >
> > Thanks, Paul Anderson
> >
>
>