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- Newsgroups: comp.unix.sys5.r4
- Path: sparky!uunet!wupost!cs.utexas.edu!zaphod.mps.ohio-state.edu!menudo.uh.edu!sugar!ficc!peter
- From: peter@ferranti.com (peter da silva)
- Subject: Re: Can Sys/V force DTR low or high?
- Message-ID: <id.KS3W.U79@ferranti.com>
- Keywords: DTR
- Organization: Xenix Support, FICC
- References: <1406@minya.UUCP> <16070@auspex-gw.auspex.com>
- Date: Thu, 24 Dec 1992 22:32:31 GMT
- Lines: 44
-
- In article <16070@auspex-gw.auspex.com> guy@Auspex.COM (Guy Harris) writes:
- > >I've poked around in TFM for several Sys/V releases (both R3 and R4),
- > >and as near as I can tell, there is no (documented) equivalent of this
- > >operation in Sys/V.
-
- "stty 0" also works.
-
- > System Administration manual - yup, it's sure obvious to *me* that
- > documentation on how a *programmer* controls a device belongs in the
- > *system administrator's* manual rather than the *programmer's*
- > manual....
-
- ah yes, that's one of the fun things about the "new" manual structure...
- in every way inferior to the old sections 1-8.
-
- > Now, this requires that the underlying serial port drivers *implement*
- > those "ioctl"s; whether any particular SVR4 driver does, or doesn't, is
- > up to its author. If you find one that doesn't, complain to the vendor.
-
- Like Intel, which not only doesn't support any such ioctls, but it only
- raises DTR on open if:
-
- The process in question is a process group leader,
- and does not have a control terminal already.
-
- i.e., on "first open" for a control terminal. Not only that, but if you
- drop DTR with "stty 0" (the alternate) and then raise it again you no
- longer have a valid control terminal.
-
- (intel 410 serial card for multibus II)
-
- In addition, they claimed that this was in conformance with the SVID
- and if we wanted then to fix it we would have to pay them for the work
- on this "enhancement". They agreed that their implementation made NO
- SENSE WHATSOEVER, but since it was SVID they didn't have to fix it.
-
- They didn't have to sell any more 410 serial cards, either... and they
- didn't. We set up a separate PC for the purpose and Digiboard got our
- business. Their PC/8e drivers work just fine.
- --
- Peter da Silva `-_-'
- Ferranti International Controls Corporation 'U`
- Sugar Land, TX 77487-5012 USA
- +1 713 274 5180 "Zure otsoa besarkatu al duzu gaur?"
-