seq_open (9) - Linux Manuals
seq_open: initialize sequential file
seq_open - initialize sequential file
int seq_open(struct file
* file, const struct seq_operations * op);
- file we initialize
- method table describing the sequence
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".