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From: Ulrich Windl <ulrich.windl@rz.uni-regensburg.de>
Organization: Universitaet Regensburg, Klinikum
To: mills@udel.edu
Date: Wed, 10 Dec 1997 16:38:04 +0100
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-transfer-encoding: 7BIT
Subject: Big patch to scripts/monitoring
Priority: normal
X-mailer: Pegasus Mail for Windows (v2.53/R1)
Message-ID: <103AB9D209F5@rkdvmks1.ngate.uni-regensburg.de>

Dave, there's another big patch against scripts/monitoring. The Perl 
programs in there are rather old. As they are quite nice thogh, I 
decided to update them for the latest version of Perl, namely 5.004.

I'll include the description of changes and the patch.

Ulrich

Here is a description of changes made in ntploopwatch:

Corrected most warnings that PERL 5.004 might emit.  Corrected signal
handlers to make them work again. Corrected scaling (at least I
think). Supported case when output is sent to file or printer and
there is no X11 available. Fixed number of month in xlabels of the
plot.

Added the ability to specify printer for GNUplot other that
PostScript. Use hostname if $STATHOST is not given in configuration
file. Corrected verbosity level for some messages. Added ability to
specify a non-standard print command.

Perl 5.004_04 does no longer ignore ``-w--*-perl-*-''. Made some
cosmetic changes and added a timescale of 10 minutes.

(Other programs are functionally unchanged. lr.pl is a PERL module now.)


Index: README
===================================================================
RCS file: /home/windl/NTP/mon-REP/monitoring/README,v
retrieving revision 1.1.1.1
retrieving revision 1.2
diff -u -r1.1.1.1 -r1.2
--- README	1993/08/24 19:29:34	1.1.1.1
+++ README	1997/10/23 17:51:37	1.2
@@ -1,14 +1,14 @@
 This directory contains support for monitoring the local clock of xntp daemons.
 
-WARNING: The scripts and routines contained in this directory are bete realease!
-	 Do not depend on their correct operation. They are, however, in regular
-	 use at University of Erlangen-Nuernberg. No severe problems are known
-	 for this code.
+WARNING: The scripts and routines contained in this directory are beta
+	 release!  Do not depend on their correct operation. They are,
+	 however, in regular use at University of Erlangen-Nuernberg.
+	 No severe problems are known for this code.
 
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 PLEASE THINK TWICE BEFORE STARTING MONITORING REMOTE XNTP DEAMONS !!!!
 MONITORING MAY INCREASE THE LOAD OF THE DEAMON MONITORED AND MAY
-INCREASE THE NETWORK LOAD SIGNIFICANTLY 
+INCREASE THE NETWORK LOAD SIGNIFICANTLY
 !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 
 
@@ -23,8 +23,8 @@
 	It sends a set_trap request to each server given and dumps the
 	trap messages received. It handles refresh of set_trap.
 	Currently it handles only NTP V2, however the NTP V3 servers
-	also accept v2 requests. It will not interpret v3 system and peer
-	stati correctly.
+	also accept v2 requests. It will not interpret v3 system and
+	peer stati correctly.
 
 	usage:
 	  ntptrap [-n] [-p <port>] [-l <debug-output>] servers...
@@ -72,7 +72,9 @@
 	
 	if a timeout occurs the next sample is tried after delay/2 seconds
 
-	The script will terminate after MAX_FAIL (currently 60) consecutive errors.
+	The script will terminate after MAX_FAIL (currently 60)
+	consecutive errors.
+
 	Errors are counted for:
 		- error on send call
 		- error on select call
@@ -114,10 +116,10 @@
 	command line values would be replaced by settings from the config file.
 
 	printer:	specify printer to print plot
-			BSD print systems semantics apply; if printer is omitted
-			the name "ps" is used; plots are prepared using
-			PostScript, thus the printer should best accept
-			postscript input
+			BSD print systems semantics apply; if printer
+			is omitted the name "ps" is used; plots are
+			prepared using PostScript, thus the printer
+			should best accept postscript input
 
 	For the following see also the comments in loopwatch.config.SAMPLE
 
@@ -139,8 +141,10 @@
 	within display range
 
 timelocal.pl:
-	used during conversion of ISO_DATE_TIME values specified in loopwatch
-	config files to unix epoch values (seconds since 1970-01-01_00:00_00 UTC)
+
+	used during conversion of ISO_DATE_TIME values specified in
+	loopwatch config files to unix epoch values (seconds since
+	1970-01-01_00:00_00 UTC)
 
 	A version of this file is distributed with perl-4.x, however,
 	it has a bug related to dates crossing 1970, causing endless loops..
Index: lr.pl
===================================================================
RCS file: /home/windl/NTP/mon-REP/monitoring/lr.pl,v
retrieving revision 1.1.1.1
retrieving revision 1.4
diff -u -r1.1.1.1 -r1.4
--- lr.pl	1993/08/24 19:29:33	1.1.1.1
+++ lr.pl	1997/10/23 17:51:37	1.4
@@ -9,9 +9,14 @@
 ;#  Frank Kardel, Rainer Pruy
 ;#  Friedrich-Alexander Universitaet Erlangen-Nuernberg
 ;#
+;#  Copyright (c) 1997 by
+;#  Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
+;#  (Converted to a PERL 5.004 package)
 ;#
 ;#############################################################
 
+package lr;
+
 ##
 ## y = A + Bx
 ##
@@ -23,123 +28,124 @@
 ##
 ## interface
 ##
-*lr_init   = *lr'lr_init;	#';# &lr_init(tag); initialize data set for tag
-*lr_sample = *lr'lr_sample;	#';# &lr_sample(x,y,tag); enter sample
-*lr_Y      = *lr'lr_Y;		#';# &lr_Y(x,tag); compute y for given x 
-*lr_X      = *lr'lr_X;		#';# &lr_X(y,tag); compute x for given y
-*lr_r      = *lr'lr_r;		#';# &lr_r(tag);   regression coeffizient
-*lr_cov    = *lr'lr_cov;	#';# &lr_cov(tag); covariance
-*lr_A      = *lr'lr_A;		#';# &lr_A(tag);   
-*lr_B      = *lr'lr_B;		#';# &lr_B(tag);
-*lr_sigma  = *lr'lr_sigma;	#';# &lr_sigma(tag); standard deviation
-*lr_mean   = *lr'lr_mean;	#';# &lr_mean(tag);
+;# init(tag);		initialize data set for tag
+;# sample(x, y, tag);	enter sample
+;# Y(x, tag);		compute y for given x 
+;# X(y, tag);		compute x for given y
+;# r(tag);		regression coefficient
+;# cov(tag);		covariance
+;# A(tag);   
+;# B(tag);
+;# sigma(tag);		standard deviation
+;# mean(tag);
 #########################
 
-package lr;
-
-sub tagify
-{
-    local($tag) = @_;
-    if (defined($tag))
-    {
-      *lr_n   = eval "*${tag}_n";
-      *lr_sx  = eval "*${tag}_sx";
-      *lr_sx2 = eval "*${tag}_sx2";
-      *lr_sxy = eval "*${tag}_sxy";
-      *lr_sy  = eval "*${tag}_sy";
-      *lr_sy2 = eval "*${tag}_sy2";
-    }
-}
-
-sub lr_init
+sub init
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    $lr_n   = 0;
-    $lr_sx  = 0.0;
-    $lr_sx2 = 0.0;
-    $lr_sxy = 0.0;
-    $lr_sy  = 0.0;
-    $lr_sy2 = 0.0;
+    $self->{n}   = 0;
+    $self->{sx}  = 0.0;
+    $self->{sx2} = 0.0;
+    $self->{sxy} = 0.0;
+    $self->{sy}  = 0.0;
+    $self->{sy2} = 0.0;
 }
 
-sub lr_sample
+sub sample($$$)
 {
-    local($_x, $_y) = @_;
-
-    &tagify($_[$[+2]) if defined($_[$[+2]);
+    my $self = shift;
+    my($_x, $_y) = @_;
 
-    $lr_n++;
-    $lr_sx  += $_x;
-    $lr_sy  += $_y;
-    $lr_sxy += $_x * $_y;
-    $lr_sx2 += $_x**2;
-    $lr_sy2 += $_y**2;
+    ++($self->{n});
+    $self->{sx}  += $_x;
+    $self->{sy}  += $_y;
+    $self->{sxy} += $_x * $_y;
+    $self->{sx2} += $_x**2;
+    $self->{sy2} += $_y**2;
 }
 
-sub lr_B
+sub B($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return 1 unless ($lr_n * $lr_sx2 - $lr_sx**2);
-    return ($lr_n * $lr_sxy - $lr_sx * $lr_sy) / ($lr_n * $lr_sx2 - $lr_sx**2);
+    return 1 unless ($self->{n} * $self->{sx2} - $self->{sx}**2);
+    return ($self->{n} * $self->{sxy} - $self->{sx} * $self->{sy})
+	/ ($self->{n} * $self->{sx2} - $self->{sx}**2);
 }
 
-sub lr_A
+sub A($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return ($lr_sy - &lr_B * $lr_sx) / $lr_n;
+    return ($self->{sy} - B($self) * $self->{sx}) / $self->{n};
 }
 
-sub lr_Y
+sub Y($$)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return &lr_A + &lr_B * $_[$[];
+    return A($self) + B($self) * $_[$[];
 }
 
-sub lr_X
+sub X($$)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return ($_[$[] - &lr_A) / &lr_B;
+    return ($_[$[] - A($self)) / B($self);
 }
 
-sub lr_r
+sub r($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    local($s) = ($lr_n * $lr_sx2 - $lr_sx**2) * ($lr_n * $lr_sy2 - $lr_sy**2);
+    my $s = ($self->{n} * $self->{sx2} - $self->{sx}**2)
+	  * ($self->{n} * $self->{sy2} - $self->{sy}**2);
 
     return 1 unless $s;
     
-    return ($lr_n * $lr_sxy - $lr_sx * $lr_sy) / sqrt($s);
+    return ($self->{n} * $self->{sxy} - $self->{sx} * $self->{sy}) / sqrt($s);
 }
 
-sub lr_cov
+sub cov($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return ($lr_sxy - $lr_sx * $lr_sy / $lr_n) / ($lr_n - 1);
+    return ($self->{sxy} - $self->{sx} * $self->{sy} / $self->{n})
+	/ ($self->{n} - 1);
 }
 
-sub lr_sigma
+sub sigma($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return 0 if $lr_n <= 1;
-    return sqrt(($lr_sy2 - ($lr_sy * $lr_sy) / $lr_n) / ($lr_n));
+    return 0 if $self->{n} <= 1;
+    return sqrt(($self->{sy2} - ($self->{sy} * $self->{sy}) / $self->{n})
+		/ ($self->{n}));
 }
 
-sub lr_mean
+sub mean($)
 {
-    &tagify($_[$[]) if defined($_[$[]);
+    my $self = shift;
 
-    return 0 if $lr_n <= 0;
-    return $lr_sy / $lr_n;
+    return 0 if $self->{n} <= 0;
+    return $self->{sy} / $self->{n};
 }
 
-&lr_init();
+sub new
+{
+    my $class = shift;
+    my $self = {
+	(n => undef,
+	 sx => undef,
+	 sx2 => undef,
+	 sxy => undef,
+	 sy => undef,
+	 sy2 => undef)
+    };
+    bless $self, $class;
+    init($self);
+    return $self;
+}
 
 1;
Index: ntp.pl
===================================================================
RCS file: /home/windl/NTP/mon-REP/monitoring/ntp.pl,v
retrieving revision 1.1.1.1
retrieving revision 1.3
diff -u -r1.1.1.1 -r1.3
--- ntp.pl	1993/08/24 19:29:34	1.1.1.1
+++ ntp.pl	1997/10/23 18:19:41	1.3
@@ -1,4 +1,4 @@
-#!/local/bin/perl
+#!/usr/bin/perl -w
 ;#
 ;# ntp.pl,v 3.1 1993/07/06 01:09:09 jbj Exp
 ;#
@@ -43,7 +43,7 @@
     ;#  N  key
     ;#  N2 checksum
     
-;# first bye of packet
+;# first byte of packet
 sub pkt_LI   { return ($_[$[] >> 6) & 0x3; }
 sub pkt_VN   { return ($_[$[] >> 3) & 0x7; }
 sub pkt_MODE { return ($_[$[]     ) & 0x7; }
@@ -223,6 +223,7 @@
 {
     &getval(&psw_PSel($_[$[]),*PeerSelection);
 }
+
 sub PeerEvent
 {
     &getval(&psw_PCode($_[$[]),*PeerEvent);
@@ -394,14 +395,14 @@
 	$lastseen = 1 if !&pkt_M($r_e_m_op);
 	if (!defined(%FRAGS))
 	{
-	    (&pkt_M($r_e_m_op) ? " more" : "")."\n";
+	    print((&pkt_M($r_e_m_op) ? " more" : "")."\n");
 	    $FRAGS{$offset} = $data;
 	    ;# save other info
 	    @FRAGS = ($status,$associd,&pkt_OP($r_e_m_op),$seq,$auth_keyid,$r_e_m_op);
 	}
 	else
 	{
-	    (&pkt_M($r_e_m_op) ? " more" : "")."\n";
+	    print((&pkt_M($r_e_m_op) ? " more" : "")."\n");
 	    ;# add frag to previous - combine on the fly
 	    if (defined($FRAGS{$offset}))
 	    {
Index: ntploopstat
===================================================================
RCS file: /home/windl/NTP/mon-REP/monitoring/ntploopstat,v
retrieving revision 1.1.1.1
retrieving revision 1.3
diff -u -r1.1.1.1 -r1.3
--- ntploopstat	1993/08/24 19:29:32	1.1.1.1
+++ ntploopstat	1997/11/23 19:07:12	1.3
@@ -1,4 +1,5 @@
-#!/local/bin/perl -w--*-perl-*-
+#!/usr/bin/perl -w
+# --*-perl-*-
 ;#
 ;# ntploopstat,v 3.1 1993/07/06 01:09:11 jbj Exp
 ;# 
@@ -22,7 +23,7 @@
 ;#              (Should have implemented &gettimeofday()..)
 ;#
 
-$0 =~ s!^.*/([^/]+)$!\1!;		# beautify script name
+$0 =~ s!^.*/([^/]+)$!$1!;		# beautify script name
 
 $ntpserver = 'localhost';		# default host to poll
 $delay = 60;				# default sampling rate
Index: ntploopwatch
===================================================================
RCS file: /home/windl/NTP/mon-REP/monitoring/ntploopwatch,v
retrieving revision 1.1.1.1
retrieving revision 1.14
diff -u -r1.1.1.1 -r1.14
--- ntploopwatch	1993/10/22 14:28:18	1.1.1.1
+++ ntploopwatch	1997/12/07 17:06:36	1.14
@@ -1,4 +1,5 @@
-#!/local/bin/perl -w--*-perl-*-
+#!/usr/bin/perl -w
+#--*-perl-*-
 ;#
 ;# ntploopwatch,v 3.1 1993/07/06 01:09:13 jbj Exp
 ;#
@@ -9,12 +10,17 @@
 ;#  Copyright (c) 1992 
 ;#  Rainer Pruy Friedrich-Alexander Universitaet Erlangen-Nuernberg
 ;#
+;#  Copyright (c) 1997
+;#  Ulrich Windl <Ulrich.Windl@rz.uni-regensburg.de>
+;#  (Corrections for Perl5 and other fixes)
 ;#
 ;#############################################################
-$0 =~ s!^.*/([^/]+)$!\1!;
+$0 =~ s!^.*/([^/]+)$!$1!;
 $F = ' ' x length($0);
 $|=1;
 
+use 5.004;	# require 5.004
+
 $ENV{'SHELL'} = '/bin/sh'; # use bourne shell
 
 undef($config);
@@ -23,17 +29,17 @@
 undef($samples);
 undef($StartTime);
 undef($EndTime);
-($a,$b) if 0;			# keep -w happy
+
 $usage = <<"E-O-P";
 usage:
-  to watch statistics permanently:
+  to watch statistics periodically:
      $0 [-v[<level>]] [-c <config-file>] [-d <working-dir>]
      $F [-h <hostname>]
 
   to get a single print out specify also
-     $F -P[<printer>] [-s<samples>]
-     $F               [-S <start-time>] [-E <end-time>]
-     $F               [-Y <MaxOffs>] [-y <MinOffs>]
+     $F -P[[<term_type:>]<printer>]
+     $F [-s<samples>] [-S <start-time>] [-E <end-time>]
+     $F [-Y <MaxOffs>] [-y <MinOffs>]
 
 If You like long option names, You can use:
     -help
@@ -41,21 +47,28 @@
     -d    +directory
     -h    +host
     -v    +verbose[=<level>]
-    -P    +printer[=<printer>]
+    -P    +printer[=[<term_type>:]<printer>[:<print_cmd>]]
     -s    +samples[=<samples>]
     -S    +starttime
     -E    +endtime
     -Y    +maxy
     -y    +miny
 
+If <printer> is prefixed with a <term_type> and a colon, the <term_type>
+given is used as terminal fpr gnuplot.
 If <printer> contains a '/' (slash character) output is directed to 
 a file of this name instead of delivered to a printer.
+If suffix :<print_cmd> is given, the suffix is used as the print command,
+and <printer> is ignored.  If blanks are needed inside <term_type> or
+<print_cmd>, just use underscores instead.
 E-O-P
 
 ;# add directory to look for lr.pl and timelocal.pl (in front of current list)
 unshift(@INC,"/src/NTP/v3/xntp/monitoring");
 
 require "lr.pl";	# linear regresion routines
+my $lr_offs = new lr;
+my $lr_freq = new lr;
 
 $MJD_1970 = 40587;		# from ntp.h (V3)
 $RecordSize = 48;		# usually a line fits into 42 bytes
@@ -171,16 +184,20 @@
 
 ;# configuration file
 $config = "loopwatch.config" unless defined($config);
-($STATHOST = $config) =~ s!.*loopwatch\.config.([^/\.]*)$!\1!
+($STATHOST = $config) =~ s!.*loopwatch\.config.([^/\.]+)$!$1!
     unless defined($STATHOST);
-($STATTAG = $STATHOST) =~ s/^([^\.\*\s]+)\..*$/\1/;
+if ($STATHOST eq $config) {
+    require "hostname.pl";
+    $STATHOST = hostname();
+}
+($STATTAG = $STATHOST) =~ s/^([^\.\*\s]+)\..*$/$1/;
 
 $srcprefix =~ s/\$STATHOST/$STATHOST/g;
 
 ;# plot command 
-@plotcmd=("gnuplot",
-	  '-title', "Ntp loop filter statistics $STATHOST",
-	  '-name', "NtpLoopWatch_$STATTAG");
+@plotcmd=("gnuplot");
+push(@plotcmd, '-title', "NTP loop filter statistics for $STATHOST",
+     '-name', "NtpLoopWatch_$STATTAG") unless $PrintIt;
 $tmpfile = "/tmp/ntpstat.$$";
 
 ;# other variables
@@ -211,9 +228,8 @@
 	       $?>>8,$? & 0xff)) if $?;
   exit(1) if $? && defined($Plotpid) && $pid == $Plotpid;
 }
-&sigchld if 0;
-$SIG{'CHLD'} = "sigchld";
-$SIG{'CLD'} = "sigchld";
+$SIG{'CHLD'} = \&sigchld;
+$SIG{'CLD'} = \&sigchld;
 
 sub abort
 {
@@ -221,8 +237,7 @@
   defined($Plotpid) && kill('TERM',$Plotpid);
   die("$0: received signal SIG$_[$[] - exiting\n");
 }
-&abort if 0;	# make -w happy - &abort IS used
-$SIG{'INT'} = $SIG{'HUP'} = $SIG{'QUIT'} = $SIG{'TERM'} = $SIG{'PIPE'} = "abort";
+$SIG{'INT'} = $SIG{'HUP'} = $SIG{'QUIT'} = $SIG{'TERM'} = $SIG{'PIPE'} = \&abort;
 
 ;#
 sub abs
@@ -248,7 +263,7 @@
    open(STDOUT,">&STDERR") ||
        die("$0: failed to redirect STDOUT of plot command: $!\n");
    
-   print STDOUT "plot command running as $$\n";
+   print STDOUT "plot command has PID $$\n";
 
    exec @plotcmd;
    die("$0: failed to exec (@plotcmd): $!\n");
@@ -275,128 +290,83 @@
     s/^([^\#]*[^\#\s]?)\s*\#.*$//;
     next if /^\s*$/;
 
-    s/^\s*([^=\s]*)\s*=\s*(.*\S)\s*$/\1=\2/;
+    s/^\s*([^=\s]*)\s*=\s*(.*\S)\s*$/$1=$2/;
 
-    ($c,$v) = split(/=/,$_,2);
+    ($c,$v) = ($1, $2);
     print "processing \"$c=$v\"\n" if $verbose > 3;
-    ($c eq "delay") && ($delay = $v,1) && next;
-    ($c eq 'samples') && (!defined($PrintIt) || !defined($samples)) &&
-	($samples = $v,1) && next;
-    ($c eq 'srcprefix') && (($srcprefix=$v)=~s/\$STATHOST/$STATHOST/g,1)
-	&& next;
-    ($c eq 'showoffs') &&
-	($showoffs = ($v eq 'yes' || $v eq 'y' || $v != 0),1) && next;
-    ($c eq 'showfreq') &&
-	($showfreq = ($v eq 'yes' || $v eq 'y' || $v != 0),1) && next;
-    ($c eq 'showcmpl') &&
-	($showcmpl = ($v eq 'yes' || $v eq 'y' || $v != 0),1) && next;
-    ($c eq 'showoreg') &&
-	($showoreg = ($v eq 'yes' || $v eq 'y' || $v != 0),1) && next;
-    ($c eq 'showfreg') &&
-	($showfreg = ($v eq 'yes' || $v eq 'y' || $v != 0),1) && next;
-
-    ($c eq 'exit') && (unlink($tmpfile),die("$0: exit by config request\n"));
-
-    ($c eq 'freqbase' ||
-     $c eq 'cmplscale') &&
-	do {
-	    if (! defined($v) || $v eq "" || $v eq 'dynamic')
-	    {
-	      eval "undef(\$$c);";
-	    }
-	    else
-	    {
-	      eval "\$$c = \$v;";
-	    }
-	    next;
-	};
-    ($c eq 'timebase') &&
-	do {
-	    if (! defined($v) || $v eq "" || $v eq "dynamic")
-	    {
-	      undef($timebase);
-	    }
-	    else
-	    {
-	      $timebase=&date_time_spec2seconds($v);
-	    }
-	};
-    ($c eq 'EndTime') &&
-	do {
-	    next if defined($EndTime) && defined($PrintIt);
-	    if (! defined($v) || $v eq "" || $v eq "none")
-	    {
-	      undef($EndTime);
-	    }
-	    else
-	    {
-	      $EndTime=&date_time_spec2seconds($v);
-	    }
-	};
-    ($c eq 'StartTime') &&
-	do {
-	    next if defined($StartTime) && defined($PrintIt);
-	    if (! defined($v) || $v eq "" || $v eq "none")
-	    {
-	      undef($StartTime);
-	    }
-	    else
-	    {
-	      $StartTime=&date_time_spec2seconds($v);
-	    }
-	};
-
-    ($c eq 'MaxY') &&
-	do {
-	    next if defined($MaxY) && defined($PrintIt);
-	    if (! defined($v) || $v eq "" || $v eq "none")
-	    {
-	      undef($MaxY);
-	    }
-	    else
-	    {
-	      $MaxY=$v;
-	    }
-	};
-
-    ($c eq 'MinY') &&
-	do {
-	    next if defined($MinY) && defined($PrintIt);
-	    if (! defined($v) || $v eq "" || $v eq "none")
-	    {
-	      undef($MinY);
-	    }
-	    else
-	    {
-	      $MinY=$v;
-	    }
-	};
-
-    ($c eq 'deltaT') &&
-	do {
-	    if (!defined($v) || $v eq "")
-	    {
-	      undef($deltaT);
-	    }
-	    else
-	    {
-	      $deltaT = $v;
-	    }
-	    next;
-	};
-    ($c eq 'verbose') && ! defined($PrintIt) &&
-	do {
-	     if (!defined($v) || $v == 0)
-	     {
-	       $verbose = 0;
-	     }
-	     else
-	     {
-	       $verbose = $v;
-	     }
-	     next;
-	};
-    ;# otherwise: silently ignore unrecognized config line
+    if ($c eq "delay") {
+	$delay = $v;
+    } elsif ($c eq 'samples') {
+	$samples = $v if (!defined($PrintIt) || !defined($samples));
+    } elsif ($c eq 'srcprefix') {
+	($srcprefix = $v) =~ s/\$STATHOST/$STATHOST/g;
+    } elsif ($c eq 'showoffs') {
+	$showoffs = ($v =~ /^yes$|^y$|^1$/);
+    } elsif ($c eq 'showfreq') {
+	$showfreq = ($v =~ /^yes$|^y$|^1$/);
+    } elsif ($c eq 'showcmpl') {
+	$showcmpl = ($v =~ /^yes$|^y$|^1$/);
+    } elsif ($c eq 'showoreg') {
+	$showoreg = ($v =~ /^yes$|^y$|^1$/);
+    } elsif ($c eq 'showfreg') {
+	$showfreg = ($v =~ /^yes$|^y$|^1$/);
+    } elsif ($c eq 'exit') {
+	unlink($tmpfile); die("$0: exit by config request\n");
+    } elsif ($c eq 'freqbase' || $c eq 'cmplscale') {
+	if (! defined($v) || $v eq "" || $v eq 'dynamic') {
+	    eval "undef(\$$c);";
+	} else {
+	    eval "\$$c = \$v;";
+	}
+    } elsif ($c eq 'timebase') {
+	if (! defined($v) || $v eq "" || $v eq "dynamic") {
+	    undef($timebase);
+	} else {
+	    $timebase=&date_time_spec2seconds($v);
+	}
+    } elsif ($c eq 'EndTime') {
+	next if defined($EndTime) && defined($PrintIt);
+	if (! defined($v) || $v eq "" || $v eq "none") {
+	    undef($EndTime);
+	} else {
+	    $EndTime=&date_time_spec2seconds($v);
+	}
+    } elsif ($c eq 'StartTime') {
+	next if defined($StartTime) && defined($PrintIt);
+	if (! defined($v) || $v eq "" || $v eq "none") {
+	    undef($StartTime);
+	} else {
+	    $StartTime=&date_time_spec2seconds($v);
+	}
+    } elsif ($c eq 'MaxY') {
+	next if defined($MaxY) && defined($PrintIt);
+	if (! defined($v) || $v eq "" || $v eq "none") {
+	    undef($MaxY);
+	} else {
+	    $MaxY=$v;
+	}
+    } elsif ($c eq 'MinY') {
+	next if defined($MinY) && defined($PrintIt);
+	if (! defined($v) || $v eq "" || $v eq "none") {
+	    undef($MinY);
+	} else {
+	    $MinY=$v;
+	}
+    } elsif ($c eq 'deltaT') {
+	if (!defined($v) || $v eq "") {
+	    undef($deltaT);
+	} else {
+	    $deltaT = $v;
+	}
+    } elsif ($c eq 'verbose' && ! defined($PrintIt)) {
+	if (!defined($v) || $v == 0) {
+	    $verbose = 0;
+	} else {
+	    $verbose = $v;
+	}
+    } else {
+	;# otherwise: silently ignore unrecognized config line
+    }
   }
   close(CF);
   ;# set show defaults when nothing selected
@@ -413,16 +383,16 @@
     print  "   showcmpl\t= $showcmpl\n";
     print  "   showoreg\t= $showoreg\n";
     print  "   showfreg\t= $showfreg\n";
-    printf "   timebase\t= %s",defined($timebase)?&ctime($timebase):"dynamic\n";
-    printf "   freqbase\t= %s\n",defined($freqbase)  ?"$freqbase":"dynamic";
-    printf "   cmplscale\t= %s\n",defined($cmplscale)?"$cmplscale":"dynamic";
-    printf "   StartTime\t= %s",defined($StartTime)?&ctime($StartTime):"none\n";
-    printf "   EndTime\t= %s",  defined($EndTime) ?  &ctime($EndTime):"none\n";
-    printf "   MaxY\t= %s",defined($MaxY)? $MaxY      :"none\n";
-    printf "   MinY\t= %s",defined($MinY)? $MinY      :"none\n";
+    printf "   timebase\t= %s", defined($timebase) ? &ctime($timebase) : "dynamic\n";
+    printf "   freqbase\t= %s\n", defined($freqbase) ? "$freqbase" : "dynamic";
+    printf "   cmplscale\t= %s\n", defined($cmplscale) ? "$cmplscale" : "dynamic";
+    printf "   StartTime\t= %s", defined($StartTime) ? &ctime($StartTime) : "none\n";
+    printf "   EndTime\t= %s", defined($EndTime) ? &ctime($EndTime):"none\n";
+    printf "   MaxY\t= %s", defined($MaxY) ? $MaxY : "none\n";
+    printf "   MinY\t= %s", defined($MinY) ? $MinY : "none\n";
     print  "   verbose\t= $verbose\n";
   }
-print "configuration file read\n" if $verbose > 2;
+  print "configuration file read\n" if $verbose > 2;
 }
 
 sub make_doplot
@@ -443,10 +413,9 @@
     ;# number of integral seconds to get at least 12 tic marks on x axis
     $t = int(($maxtime - $mintime) / 12 + 0.5);
     $t = 1 unless $t;		# prevent $t to be zero
-    foreach $i (30,
-		60,5*60,15*60,30*60,
-		60*60,2*60*60,6*60*60,12*60*60,
-		24*60*60,48*60*60)
+    foreach $i (30, 60,
+		5*60, 10*60, 15*60, 30*60, 60*60,
+		2*60*60, 6*60*60, 12*60*60, 24*60*60, 48*60*60)
     {
 	last if $t < $i;
 	$t = $t - ($t % $i);
@@ -458,31 +427,30 @@
 	 $i <= $maxtime + $t;
 	 $i += $t, $c=",")
     {
+	my ($sec, $min, $hour, $mday, $mon, $year, $wday) = localtime($i);
+
 	$s .= $c;
 	((int($i / $t) % 2) &&
 	 ($s .= sprintf("'' %lf",($i - $LastTimeBase)/3600))) ||
 	     (($t <= 60) &&
 	      ($s .= sprintf("'%d:%02d:%02d' %lf",
-			     (localtime($i))[$[+2,$[+1,$[+0],
-			     ($i - $LastTimeBase)/3600))) 
+			     $hour, $min, $sec, ($i - $LastTimeBase) / 3600))) 
 		 || (($t <= 2*60*60) &&
 		     ($s .= sprintf("'%d:%02d' %lf",
-				    (localtime($i))[$[+2,$[+1],
-				    ($i - $LastTimeBase)/3600)))
+				    $hour, $min, ($i - $LastTimeBase) / 3600)))
 		     || (($t <= 12*60*60) &&
 			 ($s .= sprintf("'%s %d:00' %lf",
-					$Day[(localtime($i))[$[+6]],
-					(localtime($i))[$[+2],
-					($i - $LastTimeBase)/3600)))
+					$Day[$wday], $hour,
+					($i - $LastTimeBase) / 3600)))
 			 || ($s .= sprintf("'%d.%d-%d:00' %lf",
-					   (localtime($i))[$[+3,$[+4,$[+2],
-					   ($i - $LastTimeBase)/3600));
+					   $mday, $mon + 1, $hour,
+					   ($i - $LastTimeBase) / 3600));
     }
     $doplot .= "set xtics ($s)\n";
     
     chop($xts = &ctime($mintime));
     chop($xte = &ctime($maxtime));
-    $doplot .= "set xlabel 'Start:  $xts    --   Time Scale   --    End:  $xte'\n";
+    $doplot .= "set xlabel 'Start: $xts   -- Time Scale --   End: $xte'\n";
     $doplot .= "set yrange [" ;
     $doplot .= defined($MinY) ? sprintf("%lf", $MinY) : $miny;
     $doplot .= ':';
@@ -518,22 +486,22 @@
 	 $c = ",");
     $showoreg && $showoffs &&
 	($doplot .= sprintf($regfmt, $c,
-			    &lr_B('offs'),&lr_A('offs'),
-			    "offset   ",
-			    &lr_B('offs'),
-			    ((&lr_A('offs')) < 0 ? '-' : '+'),
-			    &abs(&lr_A('offs')), &lr_r('offs'),
+			    $lr_offs->B(),$lr_offs->A(),
+			    "offset",
+			    $lr_offs->B(),
+			    (($lr_offs->A()) < 0 ? '-' : '+'),
+			    &abs($lr_offs->A()), $lr_offs->r(),
 			    "[ms]"),
 	 $c = ",");
     $showfreg && $showfreq &&
 	($doplot .= sprintf($regfmt, $c,
-			    &lr_B('freq') * $FreqScale,
-			    (&lr_A('freq') + $minfreq) * $FreqScale - $LastFreqBase,
+			    $lr_freq->B() * $FreqScale,
+			    ($lr_freq->A() + $minfreq) * $FreqScale - $LastFreqBase,
 			    "frequency",
-			    &lr_B('freq') * $FreqScale,
-			    ((&lr_A('freq') + $minfreq) * $FreqScale - $LastFreqBase) < 0 ? '-' : '+',
-			    &abs((&lr_A('freq') + $minfreq) * $FreqScale - $LastFreqBase),
-			    &lr_r('freq'),
+			    $lr_freq->B() * $FreqScale,
+			    (($lr_freq->A() + $minfreq) * $FreqScale - $LastFreqBase) < 0 ? '-' : '+',
+			    &abs(($lr_freq->A() + $minfreq) * $FreqScale - $LastFreqBase),
+			    $lr_freq->r(),
 			    "[${FreqScaleInv}ppm]"),
 	 $c = ",");
     $doplot .= "\n";
@@ -583,7 +551,7 @@
     $#loffset = $[ - 1;
     $#filekey = $[ - 1;
     print "memory allocation ready\n" if $verbose > 2;
-    sleep(3) if $verbose > 1;
+    sleep(3) if $verbose > 2;
 
     if (index($in,"/") < $[)
     {
@@ -606,7 +574,6 @@
 	;# rescan directory on changes
 	$Lsdir = $sdir;
 	$Ltime = (stat($sdir))[$[+9];
-	</X{> if 0;		# dummy line - calm down my formatter
 	local(@newfiles) = < ${in}*[0-9] >;
 	local($st_dev,$st_ino,$st_mtime,$st_size,$name,$key,$modified);
 
@@ -626,7 +593,7 @@
 		$F_key{$name} = $key;
 		$modified++;
 	    }
-	    if (!defined($F_name{$key}) || $F_name{$key} != $name)
+	    if (!defined($F_name{$key}) || $F_name{$key} ne $name)
 	    {
 		$F_name{$key} = $name;
 		$modified++;
@@ -643,9 +610,9 @@
 	    }
 	    if ($modified)
 	    {
-		print "new data \"$name\" key: $key;\n" if $verbose > 1;
+		print "new data \"$name\" key: $key;\n" if $verbose > 2;
 	        print "             size: $st_size; mtime: $st_mtime;\n"
-		    if $verbose > 1;
+		    if $verbose > 2;
 		$F_last{$key} = $F_first{$key} = $st_mtime;
 		$F_first{$key}--; # prevent zero divide later on
 		;# now compute derivated attributes
@@ -692,7 +659,7 @@
 		}
 		close(IN);
 		print("             first: ",$F_first{$key},
-		      " last: ",$F_last{$key},"\n") if $verbose > 1;
+		      " last: ",$F_last{$key},"\n") if $verbose > 2;
 	    }
 	}
 	;# now reclaim memory used for files no longer referenced ...
@@ -739,7 +706,7 @@
 	}
 	;# create list sorted by time
 	@F_files = sort {$F_first{$a} <=> $F_first{$b}; } keys(%F_name);
-	if ($verbose > 1)
+	if ($verbose > 2)
 	{
 	    print "Resulting file list:\n";
 	    foreach (@F_files)
@@ -797,7 +764,7 @@
 	    print "guess start according to StartTime ($StartTime)\n"
 		if $verbose > 3;
 
-	    if ($fpos[$[] eq 'start')
+	    if (defined $fpos[$[] && $fpos[$[] eq 'start')
 	    {
 		if (grep($_ eq $fpos[$[+1],@f))
 		{
@@ -1001,9 +968,9 @@
 	    $t += $F[$[+1];	# add seconds + fraction
 	    
 	    ;# multiply offset by 1000 to get ms - try to avoid float op
-	    (($F[$[+2] =~ s/(\d*)\.(\d{3})(\d*)/\1\2.\3/) &&
+	    (($F[$[+2] =~ s/(\d*)\.(\d{3})(\d*)/$1$2.$3/) &&
 	     $F[$[+2] =~ s/0+([\d\.])/($1 eq '.') ? '0.' : $1/e) # strip leading zeros
-		|| $F[$[+2] *= 1000;
+		|| ($F[$[+2] *= 1000);
 
 	    
 	    ;# skip samples out of specified time range
@@ -1036,8 +1003,8 @@
     print "input scanned ($l lines/",scalar(@time)," samples)\n"
 	if $verbose > 1;
     
-    &lr_init('offs');
-    &lr_init('freq');
+    $lr_offs->init();
+    $lr_freq->init();
     
     if (@time)
     {
@@ -1047,17 +1014,17 @@
 	local($freqbase) unless defined($freqbase);
 	local($cmplscale) unless defined($cmplscale);
 	
-	undef($mintime,$maxtime,$minoffs,$maxoffs,
-	      $minfreq,$maxfreq,$mincmpl,$maxcmpl,
-	      $miny,$maxy);
+	undef $mintime; undef $maxtime; undef $minoffs; undef $maxoffs;
+	undef $minfreq; undef $maxfreq; undef $mincmpl; undef $maxcmpl;
+	undef $miny; undef $maxy;
 	
 	print "computing ranges\n" if $verbose > 2;
 	
 	$LastCnt = @time;
 
 	;# @time is in ascending order (;-)
-	$mintime = @time[$[];
-	$maxtime = @time[$#time];
+	$mintime = $time[$[];
+	$maxtime = $time[$#time];
 	unless (defined($timebase))
 	{
 	    local($time,@X) = (time);
@@ -1081,24 +1048,24 @@
 	    ;# (otherwise a (shift(@a1),shift(a2)) would do),
 	    ;# I dont like to make copies of these arrays as they may be huge
 	    $i = $[;
-	    &lr_sample(($time[$i]-$timebase)/3600,$offs[$

