two-way communication through the same port under SunOs 4.0
Jim Budler
eda!jim at uunet.uu.net
Mon Dec 12 06:52:15 AEST 1988
In article <175 at cubsun.BIO.COLUMBIA.EDU>:
> According to my SunOs 4.0 manuals, as of this release you're supposed to
> be able to run a getty on ttya to enable logins, and simultaneously hook
> an outgoing modem onto the same hardware port, calling it /dev/cua0.
crw-rw---- 1 uucp devices 12, 128 Nov 26 07:43 /dev/cua0
crw--w---- 1 jim tty 12, 0 Nov 26 10:24 /dev/ttyd0
It is the same port, but it uses the minor number + 128.
> Whichever application (login or, eg, tip) grabs the port first is supposed
> to lock it to other applications. I've tried this...the getty on ttya
> ...renders /dev/cua0 busy for outgoing calls...
Working fine for me.
> This is on a 386i, but a colleague trying the identical things on a 3-160
> running 4.0 exhibits the identical symptoms.
My machine is also a sun 386i.
> Has anyone gotten it to work, or is it a known bug, or what?
Two possibilities:
1) That is the way it would act if whatever is attached to the port
asserts carrier detect all the time.
2) I configured my 386i before I got the documentation, so I set zs0 flags
0 in the config file, like you did under sun OS 3.x. The documentation,
when it arrived implies this is no longer necessary. I haven't tried it
without.
jim
--
Jim Budler address = uucp: ...!{decwrl,uunet}!eda!jim OR domain: jim at eda.com
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