[ns] Trouble with awk

[Andrea Josi <mr_josi@yahoo.it>]

Hi,

i have written an awk script that should calculate the
end to end delay for multicast packets modifying Lloyd
Wood's awk script 

(http://www.isi.edu/nsnam/archive/ns-users/webarch/1999/msg02093.html)

i can't get my awk script working:

here is how it is inserted in my tcl script:


proc finish {} {
	global ns


exec awk { 

BEGIN { max_num_client = 0; 
        max_num_pack = 0; 
}

{

if ($1 == "v") {
  if ( $8 == "join-group" ) {
     isclient[$7] = 1;
     split($9,temp,"}"); 
     whichgroup[$7] =temp[1];
     if ( $7 > max_num_client) max_num_client = $7;
}

} else {

action = $1;
time = $2;
node_1 = $3;
node_2 = $4;
src = $5; 
node_1_address = $9;
node_2_address = $10; 
packet_id = $12;

if (start[packet_id] == 0) start[packet_id] =time;

if ( action != "d" ) {
  if ( action == "r" ) {
  if (whichgroup[node_2] == $10)
end_time[node_2,packet_id] = time;
   
}
} else {
  end_time[packet_id] = -1;
}
}
}

END {
       for ( x=1; x <= max_num_client; x++) {

         if (isclient[x] == 1) {
        
           for (p=1; p <= max_num_pack; p++) {

             if ((p,x) in end_time)  {
                 delay = end_time[x,p] -
start[packet_id];
                 print(p, x, delay);
             }
           }
         }
       }
    }



} aj/ssmawk2.tr > aj/ssmawk2.txt 

	$ns flush-trace
        
	exit 0
}

Here is the output i get, it seems that some confusion
rises because of some parenthesis (i've counted them,
they should be ok!):

wrong # args: should be "proc name args body"
    while executing
"proc finish {} {
        global ns


exec awk {

BEGIN { max_num_client = 0;
        max_num_pack = 0;
}

{

if ($1 == "v") {
  if ( $8 == "join-group" ) ..."
    (file "aj/ssmawk2.tcl" line 38)  


Moreover, if i run the script from the command line:

awk -f 'prog.awk' ssmawk.tr > ris.txt 

I get no error output but the file "ris.txt" is EMPTY
!


Thanks for your help.


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