suse man page for seq_open

SEQ_OPEN(9)							   The Linux VFS						       SEQ_OPEN(9)

NAME
       seq_open - initialize sequential file

SYNOPSIS
       int seq_open(struct file * file, const 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. Returning SEQ_SKIP means "discard this element and move on".

COPYRIGHT
Kernel Hackers Manual 2.6.					     July 2010							       SEQ_OPEN(9)