Splices data directly between two non-pipes
ssize_t splice_direct_to_actor(struct file * in, struct splice_desc * sd, splice_direct_actor * actor);
in
file to splice from
sd
actor information on where to splice to
actor
handles the data splicing
This is a special case helper to splice directly between two points, without requiring an explicit pipe. Internally an allocated pipe is cached in the process, and reused during the lifetime of that process.