Suppress a spurious EPERM warning in epoll.c

It's okay for us to get an EPERM when doing an EPOLL_DEL on an fd; it
just means that before we got a chance to the EPOLL_DEL, we closed the
fd and reopened a new non-socket that wound up having the same fd.

Partial fix for Bug 3019973.

1 files changed, 2 insertions, 1 deletions

diff --git a/epoll.c b/epoll.c
index 6c3cf33f..6707ae8a 100644
--- a/epoll.c
+++ b/epoll.c
@@ -235,7 +235,8 @@ epoll_apply_changes(struct event_base *base)
 				 */
 				event_debug(("  ADD was redundant"));
 			} else if (op == EPOLL_CTL_DEL &&
-			    (errno == ENOENT || errno == EBADF)) {
+			    (errno == ENOENT || errno == EBADF ||
+				errno == EPERM)) {
 				/* If a delete fails with one of these errors,
 				 * that's fine too: we closed the fd before we
 				 * got around to calling epoll_dispatch. */