[Konsole-devel] [Bug 61376] New: memory leak when using xterm control codes to write to titlebar

[W.B.Maguire II]

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http://bugs.kde.org/show_bug.cgi?id=61376     
           Summary: memory leak when using xterm control codes to write to
                    titlebar
           Product: konsole
           Version: unspecified
          Platform: RedHat RPMs
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: konsole-devel at kde.org
        ReportedBy: maguire at AnalyticInvestments.com


Version:           Konsole 1.2 (KDE 3.1-11 Red Hat) (using KDE KDE 3.1)
Installed from:    RedHat RPMs
OS:          Linux

I used a Perl program from "Linux Server Hacks" to display the LoadAvg in my Konsole titlebar; result: a memory leak!  I verified that the control codes used to print to an XTERM titlebar are correct, and I verified that Konsole *should* accept these XTERM codes, and I wrote a small demonstration CSH script (below).

I'm wondering if this problem has not been noticed before, because---most commonly---a path (or something) is written to a titlebar upon a directory change.  It would take quite a few directory changes to notice the memory leak!  But, if you want to display the Load Average (or time) in the titlebar---and have it update every second or two---then the leak definitely becomes noticeable.

I observed this memory leak over a *long* period of time before I figured-out the root cause.  in fact, I even upgraded from RH8.0 to RH9, since the memory leak showed-up under the "kdeinit: kicker" process, I figured it was a Kicker bug.

-------------------------------------------
#!/bin/csh

# When I run this program on my system, I see the memory of the
# "kicker" process jump up by 4kB every 17-19 seconds!  I'm using the
# "pmap" program to monitor the "kicker" memory increase.

while (1)

   # The following is the REAL stuff I *wanted* in my titlebar:
   #
   #set loadavg = `cat /proc/loadavg | awk '{print $1,"   ",$2,"   ",$3}'`
   #set datetime = `date`
   #echo -n " ]2;$tty   $loadavg     $datetime"
   #
   # This is merely to demonstrate the memory leak that exists when
   # using XTERM control-character codes to print to the titlebar.
   # The memory leak shows-up in *kicker*!  The process has the name
   # "kdeinit: kicker" on my machine.
   #
   # ]0 => write to titlebar text and icon text
   # ]1 => write to icon text
   # ]2 => write to titlebar text
   #
   # Write 40 characters (not counting control characters)...
   #
   echo -n " ]2;1234567890123456789012345678901234567890"
   #
   # ...every second:
   #
   sleep 1

end