Article View: comp.sys.sun
Article #11626Re: Sun 3 console question
From: steinmetz!dawn!stpeters
Date: Wed, 22 Mar 1989 19:34
Date: Wed, 22 Mar 1989 19:34
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slevy@nic.mr.net (Stuart Levy) writes: >We've seen two problems which can cause Sun RS-232 consoles to hang up. > ... >Another, recently discovered by some people here, it's possible to "steal" >the console device using the TIOCCONS ioctl. It caught us when people >were running xterm's on our server (to an X terminal) and happened to >start a console one. This is hard to prevent without a kernel mod but you >can ask people not to do it. This can be undone by opening "/dev/console" and doing a TIOCCONS ioctl on the descriptor. Being able to move the logical console is very handy. A colleague here (Bob Darrow) used it to help debug a device driver: printf's in a driver show up on the console, wherever it may be. We've also used it to watch failing-disk error messages on a server in a noisy room down the hall from the comfort of an office. (BTW, aren't Sun serial ports RS-432 [or some such] instead of RS-232?) -- Dick St.Peters GE Corporate R&D, Schenectady, NY stpeters@ge-crd.arpa uunet!steinmetz!stpeters
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!rice!sun-spots-request From: steinmetz!dawn!stpeters@uunet.uu.net Newsgroups: comp.sys.sun Subject: Re: Sun 3 console question Keywords: SunOS Message-ID: <13343@steinmetz.ge.com> Date: 22 Mar 89 19:34:29 GMT References: <8902230102.AA18999@nic.MR.NET> Sender: usenet@rice.edu Organization: GE Corporate R&D, Schenectady, NY Lines: 24 Approved: Sun-Spots@rice.edu Original-Date: 10 Mar 89 19:07:24 GMT X-Sun-Spots-Digest: Volume 7, Issue 204, message 5 of 13 X-Issue-Reference: v7n182