## Copyright (c) 1996 Regents of the University of California.# All rights reserved.# # Redistribution and use in source and binary forms, with or without# modification, are permitted provided that the following conditions# are met:# 1. Redistributions of source code must retain the above copyright#    notice, this list of conditions and the following disclaimer.# 2. Redistributions in binary form must reproduce the above copyright#    notice, this list of conditions and the following disclaimer in the#    documentation and/or other materials provided with the distribution.# 3. All advertising materials mentioning features or use of this software#    must display the following acknowledgement:#       This product includes software developed by the Daedalus Research#       Group at the University of California Berkeley.# 4. Neither the name of the University nor of the Research Group may be#    used to endorse or promote products derived from this software without#    specific prior written permission.# # THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE# ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF# SUCH DAMAGE.## Contributed by the Daedalus Research Group, UC Berkeley # (http://daedalus.cs.berkeley.edu)# Support code for error generation based on packet-, byte- or time-based models.# Note: Multi-state Markov models not supported yet (coming soon!).proc newErrorU {rate unit} {        set em [new ErrorModel]        set rv [new RandomVariable/Uniform]	$rv set min_ 0	$rv set max_ [expr 2*$rate]	$em ranvar $rv	$em unit $unit        $em set rate_ $rate	return $em}proc newErrorE {rate unit} {        set em [new ErrorModel]	set rv [new RandomVariable/Exponential]	$rv set avg_ $rate	$em ranvar $rv        $em set avg_ $rate	$em unit $unit	return $em}	proc newErrorM {unit} {        set em [new ErrorModel/Markov time]        set rvGood [new RandomVariable/Exponential]        $rvGood set avg_ 1        set rvBad [new RandomVariable/Exponential]        $rvBad set avg_ 0.005        $em ranvar $rvBad 1 0.5        $em ranvar $rvGood 0 0.001	$em unit $unit        return $em}proc create-error {num rate errmodel unit} {        global ns opt        global lan node source	# default is exponential errmodel	if { $errmodel == "uniform"} {		set em newErrorU	} elseif { $errmodel == "markov" } {		set em newErrorM	} else {		set em newErrorE	}	        set src $node(0)        set sifq [$lan get-ifq $src]        set slabel [[$lan get-mac $src] set label_]        for {set i 1} {$i <= $num} {incr i} {                set dst $node($i)		# Cdls is the Channel State Dependent Link Scheduler                if ![string compare $opt(ifq) Cdls] {                        [$lan get-ifq $dst] error $label0 [newErrorM]                        $sifq error [[$lan get-mac $dst] set label_] \					[newErrorM $unit]                } else {                        $lan install-error $src $dst [$em $rate $unit]                        $lan install-error $dst $src [$em $rate $unit]                }        }}