[dtrace-discuss] File name not being displayed.

[vhiz]

I found the script below in the dtrace manual:

#pragma D option quiet
BEGIN
{
    printf("%10s %58s %2s %7s\n", "DEVICE", "FILE", "RW", "MS");
}
io:::start
{
    start[args[0]->b_edev, args[0]->b_blkno] = timestamp;
}
io:::done
/start[args[0]->b_edev, args[0]->b_blkno]/
{
    this->elapsed = timestamp - start[args[0]->b_edev, args[0]->b_blkno];
    printf("%10s %58s %2s %3d.%03d\n", args[1]->dev_statname,
        args[2]->fi_pathname, args[0]->b_flags & B_READ ? "R" : "W",
        this->elapsed / 10000000, (this->elapsed / 1000) % 1000);
    start[args[0]->b_edev, args[0]->b_blkno] = 0;
}


It does not display the file name even if I am accessing a user created file. 
Any ideas? 

Thank you.
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