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NAME
       seq_open - initialize sequential file


SYNOPSIS
       int seq_open  (struct file * file, struct seq_operations * op);


ARGUMENTS
       file   file we initialize

       op     method table describing the sequence


DESCRIPTION
        seq_open  sets  file,  associating it with a sequence described by op.
       op->start sets the  iterator  up  and  returns  the  first  element  of
       sequence.  op->stop shuts it down. op->next returns the next element of
       sequence. op->show prints element into the buffer.  In  case  of  error
       ->start  and  ->next return ERR_PTR(error). In the end of sequence they
       return NULL. ->show returns 0 in case of success and negative number in
       case of error.