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- Newsgroups: comp.sys.sun.admin
- Path: sparky!uunet!cs.utexas.edu!qt.cs.utexas.edu!yale.edu!yale!gumby!destroyer!ncar!uchinews!geosun.uchicago.edu!valdes
- From: valdes@geosun.uchicago.edu (John Valdes)
- Subject: Re: resetting pseudo-terminal sizes?
- Message-ID: <1992Jul23.192543.4308@midway.uchicago.edu>
- Sender: news@uchinews.uchicago.edu (News System)
- Organization: Department of the Geophysical Sciences, University of Chicago
- References: <1992Jul22.230123.23146@midway.uchicago.edu> <13688@auspex-gw.auspex.com>
- Date: Thu, 23 Jul 1992 19:25:43 GMT
- Lines: 77
-
- >
- >>Say I start a shell
- >>in a terminal window under a windowing system (X, Openwin or Sunview,
- >>doesn't matter) and resize the window so that it's 132 colums x 50 lines.
- >>Say also that this window uses /dev/ttyp3. Now if exit the shell (an
- >>hence quit the window, freeing the tty) and then remotely log into the
- >>system so that my login uses /dev/ttyp3, the terminal size will still
- >>be set to 132 cols by 50 lines!
- >
- >Didn't happen for me when I just tried it (SunOS 4.1.1, OW 2.0).
-
- OK, I just tried to reproduce the results under OW 2.0 and 3.0, but it
- didn't show up in with either version (SunOS 4.1.1, BTW). I guess I
- was a bit rash including OW; I remember having the problem under Sunview,
- and I'm currently experiencing it under X (from MIT, X11R4), so I assumed
- the problem was present under OW also.
-
- I have been able to reliable reproduce the results under X and Sunview,
- but only under certain circumstances. Here's what I do:
-
- 1) Start up X or sunview
-
- 2) In addition to whatever xterms or cmdtools (or shelltools) opened
- when you started X or sunview, respectively, open two more. For
- example, say that you started X with two xterms which use /dev/ttyp0
- and /dev/ttyp1. You want to open two more xterms so that they
- use ttyp2 and ttyp3.
-
- 3) Resize the first of the two windows you opened in 1) (the xterm
- using ttyp2 in the example above). stty -a should reflect the new size.
-
- 4) Exit the window which you just resized (ttyp2)
-
- 5) From any of the other windows (or from another machine), telnet
- into the machine so that your login uses the same ttyp used by
- the window you just resized and quit (ttyp2, in this example).
-
- 6) If you now type stty -a, the number of rows and columns reported
- will match the size of the window you had just resized and quit.
-
- Observations:
-
- Assume ttyp(n) is the ttyp which has be resized for the following:
-
- -I see this behavior only if ttyp(n+1) is in use. For example, say
- ttyp0, ttyp1, ttyp2, ttyp3 and ttyp4 are in use. This behavior
- won't be seen if ttyp4 is the one resized. It will happen if ttyp2
- is the one resized. ttyp(n-1) may also have to be in use, but I
- haven't tested this in all cases. (Hey, I've got work to do!! (-: )
-
- -It seems that this only happens with even numbered ttyp's, but again
- I haven't tested this extensively.
-
- BTW, I'm running my xterm's suid. Does anyone else see this behavior?
-
- >
- >>but I would much prefer having the pseudo-terminal driver
- >>(re)size the terminal properly itself.
- >
- >The pseudo-tty driver can't resize it itself, as it has no idea what the
- >right size is. It can only do what the process on the master side tells
- >it.
-
- I guess I didn't express myself very well. What I meant to say is that
- I would prefer that, once a ttyp* is freed, the driver would either
- set the number of lines and columns as undefined, or set them to 0
- (which may be the same thing as undefined; I'm not that familiar with
- the workings of the driver).
-
- >There may have been a bug, in whatever version of the OS that you're
- >running, that kept the resize from happening; what version are you
- >using?
-
- SunOS 4.1.1, MIT X11R4
-
- John Valdes
- valdes@geosun.uchicago.edu
-