seq_open (9) Linux Manual Page
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”.
Note
seq_open will allocate a struct seq_file and store its pointer in file->private_data. This pointer should not be modified.