fn recv(listener: i32) -> Option<SeccompNotif>Expand description
Blocking receive; None once no process uses the filter any more.
ENOENT from RECV has two meanings: the filter has no users left, or
the notification just queued was withdrawn by a signal (a SIGCHLD
landing on a shell in a stat) before it was received. Only the former
ends the pool, and only it raises POLLHUP on the listener, which is how
the two are told apart.