From 1aaf9f013beef06680d8e6512eb6426ab70f6ba2 Mon Sep 17 00:00:00 2001
From: Dave Hart <hart@ntp.org>
Date: Mon, 18 Jun 2012 10:31:38 -0400
Subject: [PATCH] Avoid giving a spurious warning when timerfd support is
 unavailable

We forgot to do the obligatory "Check if there is no syscall there"
dance when calling timerfd_create().

(Commit message by Nick)
---
 epoll.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/epoll.c b/epoll.c
index edd4e18b48..91f0544b99 100644
--- a/epoll.c
+++ b/epoll.c
@@ -190,7 +190,14 @@ epoll_init(struct event_base *base)
 				epollop->timerfd = -1;
 			}
 		} else {
-			event_warn("timerfd_create");
+			if (errno != EINVAL && errno != ENOSYS) {
+				/* These errors probably mean that we were
+				 * compiled with timerfd/TFD_* support, but
+				 * we're running on a kernel that lacks those.
+				 */
+				event_warn("timerfd_create");
+			}
+			epollop->timerfd = -1;
 		}
 	} else {
 		epollop->timerfd = -1;