Re: buglets with pts - with patch

Michal Mertl píše v pá 03. 02. 2006 v 00:29 +0100:
> I found a couple of display issues with the new pts type ptys.
> 
> wall and who - don't check the utmp tty validity (see also PR bin/84041)
> 	The attached patch duplicates the check from the w program in who and
> wall. For some reason closed pts ttys are displayed/printed to when
> there wasn't a problem with the old pty implementation.

I forgot to properly describe the bug :-). who and wall displays/prints
to already detached pty. E.g. I open an gnome-terminal window and close
it. Then when I call who in another window the just closed pty is listed
as active.

Example:
------
mime_at_genius /usr/home/mime$ who
mime             pts/1     1 úno 18:50 (:0.0)
mime             pts/2     2 úno 01:54 (:0.0)
mime             pts/3     2 úno 16:06 (:0.0)
mime             pts/4     2 úno 16:44 (:0.0)
mime             pts/5     2 úno 23:21 (:0.0)
mime             :0        1 úno 18:46
------
mime_at_genius /usr/home/mime$ wall
a

Broadcast Message from mime_at_genius...
        (/dev/pts/4) at 10:20 CET...

a

wall: /dev/pts/5: No such file or directory
wall: /dev/:0: No such file or directory
----
"w" is correct:
------
mime_at_genius /usr/home/mime$ w
10:20dp  up 1 day,  9:26, 4 users, load averages: 0,98 0,45 0,38
USER             TTY      FROM              LOGIN_at_  IDLE WHAT
mime             pts/1    :0.0             st06od     31 bash
mime             pts/2    :0.0             čt01dp     31 ssh ..
mime             pts/3    :0.0             čt04od     51 [ssh]
mime             pts/4    :0.0             čt04od      - w
------

I also have just confirmed there is also one more bug - I don't see all
the ptys - I probably didn't investigate it enough but it seems that
pts/0 is never displayed by w, who or wall. It is correct is last output
though and ps also shows the processes running on it. I think that
whatever writes to /var/tmp/utmp doesn't write pts/0 lines to it (so w,
who and wall don't see it) but they are written correctly
to /var/log/wtmp (so last sees it).

I see now that the patches I sent out aren't a complete solution too all
the issues. I will continue looking into it.

> 
> ps - the TT column displays garbage (always "pts")
> 	The attached patch trims "pts/" from the tty name. The printout doesn't
> look nice ("10443 pts  IWs    0:00,00 bash" changes to "10443   3  IWs
> 0:00,00 bash") but the field width is 4 which doesn't allow much. The
> right solution would probably involve removing TT column and always use
> the longer version TTY with width of 8 (which allows to correctly
> display "pts/3"). I checked Solaris 10 and it displays the full tty name
> by default.
> 
> Regards
> 
> Michal