Re: python and vc numbers
> Can you make do with the tempfile module? Or you'd need to identify > from an external process which console is locked? Perhaps, I wrote a small hack: - Manually set environment variable TTYNUMBER in .bash_profile - Then use this in the script, to establish what tty I'm working with. Thanks -- Cheers, Dan http://members.iinet.net.au/~ddalton/ signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On 11/30/2009 10:05 PM, Daniel Dalton wrote: On Mon, Nov 30, 2009 at 02:26:14AM -0800, Chris Rebert wrote: Also, in my quickie newbie experimentation with `screen`, each screen "window" seems to get a unique tty#. Admittedly I am running OS X Can you make do with the tempfile module? Or you'd need to identify from an external process which console is locked? -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On Mon, 30 Nov 2009 21:02:00 +1100, Daniel Dalton wrote: >> That did the trick, thanks, after I append >> [-2] > > Further testing under screen says otherwise -- it seems to give me the > tty number, not the virtual console number. Is there any way to figure > out what virtual console I'm am in I'm sure that there are all kinds of heuristics you could try, but ultimately the question is meaningless. E.g. you can start a screen session on one terminal (which may not be a VC, but an xterm, ssh login, etc), detach it, attach it to a different terminal, or even attach it to multiple terminals. The child process only knows about its controlling terminal. If that happens to be a pty slave, you could try looking for any processes connected to the pty master. But you aren't guaranteeed to find any such processes; if a process is running under a different account, you won't be able to enumerate its descriptors. And you might find that the master is owned by e.g. sshd, in which case there really isn't any way to find out what's on the other end of the connection. If the process happens to be part of a "screen" session, you can use "screen -ls" to list sessions, and find out which terminal they are attached to (although they might be detached, or they might be attached to something other than a VC). -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
Daniel Dalton wrote: I can't find a reliable way to determine the current console number with python or any bash tool. When I say console number, I mean the actual console number, not screen window or device it is sending to or whatever. You may be able to tell by looking at the DISPLAY environment variable. Usually it has a form like localhost:X.Y where X and Y are numbers identifying the display device and screen. -- Greg -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On Mon, Nov 30, 2009 at 02:26:14AM -0800, Chris Rebert wrote: > Also, in my quickie newbie experimentation with `screen`, each screen > "window" seems to get a unique tty#. Admittedly I am running OS X Correct (Which creates the problem) > Perhaps if you could explain your problem in greater detail? Sure, well, first I am running screen in a console. Under screen I open many windows, but in my .screenrc file, after 15 minutes screen runs screen lock which is the equivalent of /usr/local/bin/lock /usr/local/bin/lock is my python script, basically it checks to see if file /tmp/.vlock.run exists and if it does, will not run vlock again, but if it doesn't then passes onto vlock. When vlock returns a clean exit, eg. the user unlocks the term, my program removes that statefile and exits nicely. (the purpose of this is so screen doesn't lock the system hundreds of times, asking for a password hundreds of times, or when using -na it doesn't create a bunch of useless blank "lock" windows in my screen session. This works well, but it is only useful for one tty, because if you lock tty1 then it blocks tty2 etc. I know I could have a bunch of different scripts using different files, but this just gets to complicated to manage, so the logical solution is to append vc number to the filename: /tmp/.vlock.run.1 /tmp/.vlock.run.2 etc So we can identify which consoles have been locked, and which haven't. The problem lies with the fact, I can't find a reliable way to determine the current console number with python or any bash tool. When I say console number, I mean the actual console number, not screen window or device it is sending to or whatever. I am totally blind, and therefore use a package called brltty, and this package has the ability to show me what number console I'm in, and even under screen always works reliably and consistently. So anyone know of a better solution, now I have described the issue in great detail? Thanks very much for all the help. Cheers, Dan signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On Mon, Nov 30, 2009 at 2:02 AM, Daniel Dalton wrote: > > On Mon, Nov 30, 2009 at 07:20:59PM +1100, Daniel Dalton wrote: >> That did the trick, thanks, after I append >> [-2] > > Further testing under screen says otherwise -- it seems to give me the > tty number, not the virtual console number. Is there any way to figure > out what virtual console I'm am in so a certain command ran under screen > process A isn't confused with a command ran under screen process B? >From what I can find, virtual console == tty. Quoting http://en.wikipedia.org/wiki/Virtual_console_%28PC%29 "The virtual consoles are represented by device special files /dev/tty1, /dev/tty2 etc." Also, in my quickie newbie experimentation with `screen`, each screen "window" seems to get a unique tty#. Admittedly I am running OS X here, so if your notion of "virtual console" differs from Wikipedia's and is Linux-specific or something... Perhaps if you could explain your problem in greater detail? Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On Mon, Nov 30, 2009 at 07:20:59PM +1100, Daniel Dalton wrote: > That did the trick, thanks, after I append > [-2] Further testing under screen says otherwise -- it seems to give me the tty number, not the virtual console number. Is there any way to figure out what virtual console I'm am in so a certain command ran under screen process A isn't confused with a command ran under screen process B? Thanks Dan signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
Re: python and vc numbers
On Mon, Nov 30, 2009 at 02:21:54PM +1300, Gregory Ewing wrote:
> >I use to figure out what tty my program was invoked from?
>
> Here's one way:
>
> % python
> Python 2.5 (r25:51908, Apr 8 2007, 22:22:18)
> [GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import os
> >>> os.popen("tty").read()
That did the trick, thanks, after I append
[-2]
It works great.
Thanks
Dan
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Re: python and vc numbers
Daniel Dalton wrote:
what function/module should
I use to figure out what tty my program was invoked from?
Here's one way:
% python
Python 2.5 (r25:51908, Apr 8 2007, 22:22:18)
[GCC 3.3 20030304 (Apple Computer, Inc. build 1809)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.popen("tty").read()
'/dev/ttyp1\n'
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python and vc numbers
Hi, I have a very simple problem, but I can't work out the answer. How do I return the current tty number in python? eg. what function/module should I use to figure out what tty my program was invoked from? Thanks -- Cheers, Dan http://members.iinet.net.au/~ddalton/ signature.asc Description: Digital signature -- http://mail.python.org/mailman/listinfo/python-list
