ppoll: make sigmask parameter optional

ppoll(2) supports 'sigmask' as NULL. In that case no signal mask
manipulation is performed.

Let's make `sigmask` parameter of `nix::poll::ppoll` optional
to allow that behaviour.

Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/test/test_poll.rs b/test/test_poll.rs
index e4b369f3..120e8e56 100644
--- a/test/test_poll.rs
+++ b/test/test_poll.rs
@@ -53,14 +53,14 @@ fn test_ppoll() {
 
     // Poll an idle pipe.  Should timeout
     let sigset = SigSet::empty();
-    let nfds = loop_while_eintr!(ppoll(&mut fds, Some(timeout), sigset));
+    let nfds = loop_while_eintr!(ppoll(&mut fds, Some(timeout), Some(sigset)));
     assert_eq!(nfds, 0);
     assert!(!fds[0].revents().unwrap().contains(PollFlags::POLLIN));
 
     write(w, b".").unwrap();
 
     // Poll a readable pipe.  Should return an event.
-    let nfds = ppoll(&mut fds, Some(timeout), SigSet::empty()).unwrap();
+    let nfds = ppoll(&mut fds, Some(timeout), None).unwrap();
     assert_eq!(nfds, 1);
     assert!(fds[0].revents().unwrap().contains(PollFlags::POLLIN));
 }