Date: Mon, 29 May 2017 11:33:51 -0700 (PDT) From: "Rodney W. Grimes" <freebsd-rwg@pdx.rh.CN85.dnsmgr.net> To: "Edward Tomasz Napiera?a" <trasz@freebsd.org> Cc: hackers@freebsd.org, Ian Lepore <ian@freebsd.org>, Ed Schouten <ed@nuxi.nl> Subject: Re: Serial line terminal size. Message-ID: <201705291833.v4TIXpZ5023460@pdx.rh.CN85.dnsmgr.net> In-Reply-To: <20170529182326.GB25108@brick>
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> On 0529T1110, Rodney W. Grimes wrote: > > [ Charset ISO-8859-2 unsupported, converting... ] > > > On Mon, 2017-05-29 at 13:22 +0200, Ed Schouten wrote: > > > > Hi Edward, > > > > > > > > 2017-05-24 10:55 GMT+02:00 Edward Tomasz Napiera?a <trasz@freebsd.org > > > > >: > > > > > > > > > > There's a problem with serial consoles - after logging in, the > > > > > terminal > > > > > size is not set, ie it looks like this (notice the "0 rows; 0 > > > > > columns;"): > > > > Wouldn't it make more sense for getty to set this up properly, as > > > > opposed to putting it in all of the shell rc files? > > > > > > > > > > I was thinking exactly the same thing a few days ago, but then I looked > > > at the source code to getty and kinda backed away slowly and quietly, > > > as one might do with any sleeping monster. > > > > Now that I can agree with. Getty has never been a friendly place. > > > > I also think this belongs in Getty despite Warners concern that you > > can not turn it off, as Getty alread does Termios stuff, which > > you control via /etc/ttys, so there is a place to make a knob should > > it be implemented in getty. > > It's still something that the _user_ - as opposed to the system > administrator - couldn't turn off. Not sure it's actually important, > though. > > > This is a specific issue to hardwired terminals, which is what > > getty was written for. > > > > It could also fixes the issues that I have pointed out in > > https://reviews.freebsd.org/D10642 with col/row not being > > reset between logins which yields the propose patch ineffective. > > If getty did reset the terminal size upon logoff, that would unbreak > the mechanism. Now, why doesn't it do that? Isn't it expected to > do so - to revert the terminal and serial port to some predefined > initial state? If it does - why doesn't this include the terminal > size? I have a feeling that issue is in the tty layer, or perhaps getty is not closing the terminal so that the reset mechanism can fire. -- Rod Grimes rgrimes@freebsd.org
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