# -*-Perl-*-

# instances allowed: one 

# (single instance modules would be silly to use more than one of
# anyway, so we use package local storage.  This is faster and places
# less artificial load on the machine than doing everything through
# the object hash)

# Cargo-cult coded from memuse

package MGMmodule::mgmrss;
use IO::Seekable;
use vars qw($xpath $widget $graph $mgmuse $memtotal $memuse $swapuse $bars);

sub module_init{
    my$this=shift;
    my$toplevel=$this->{"toplevel"};
    my$xclass=$this->{"xclass"};
    
    $this->get_mgmuse;
    $this->get_memtotal;
    
    unless ($memtotal && $mgmuse){
	$toplevel->optionAdd("$xclass*active",'false',21);
    }
    
    $toplevel->optionAdd("$xclass.order", 101,21);
    $this;
}

sub module_instance{
    my$this=shift;
    my$toplevel=$this->{"toplevel"};
    return undef if(defined($xpath));
    $xpath=$this->{"xpath"};
    
    $toplevel->optionAdd("$xpath.bar.0.label", "mgm RSS",21);

    $bars=1;

    my($minx,$miny)=&MGM::Graph::calcxysize($this,100,'% used',$bars);
    
    $toplevel->optionAdd("$xpath.minx",        $minx,21);      
    $toplevel->optionAdd("$xpath.miny",        $miny,21);          
    $toplevel->optionAdd("$xpath.scalewidadj", 80*$bars,21);  # narrower, like memuse
    $this;
}

sub module_run{
    my$this=shift;
    
    $graph=MGM::Graph->new($this,num=>$bars,prompt=>'%',fixed=>1,
			   rangesetting=>100,rangecurrent=>100);
    $widget=$graph->{"widget"};        # must return the widget
}

sub module_update{ 
    my$this=shift;
    $this->get_mgmuse; 
    $graph->set(100 * ($mgmuse/$memtotal));
}

sub get_mgmuse{
  if(open(PROC,"/proc/self/status")){
    while(<PROC>) {
      if (m/VmRSS:\s+(\d+) kB/) {
	$mgmuse = 1024 * $1;
      }
    }
    close PROC;
  }
}

sub get_memtotal{
    if(open(PROC,"/proc/meminfo")){
	<PROC>;
	$_=<PROC>;
	if(m/^Mem:\s+(\d+)\s+(\d+)\s+\d+\s+\d+\s+(\d+)\s+(\d+)/){
	    $memtotal=$1;
	    $memuse=$2-$3-$4;
	}else{
	    $memtotal=0;
	    $memuse=0;
	}
	close PROC;
    }
}


sub destroy{
    undef $xpath;
}

bless {};