From c2c5c7061059f687d6a2087c28a179e10d3ccec8 Mon Sep 17 00:00:00 2001
From: Norman Maurer <norman_maurer@apple.com>
Date: Tue, 4 Jul 2017 09:02:49 +0200
Subject: [PATCH] Correctly handle eventfd_write error and also wrap as syscall

---
 Sources/NIO/Selector.swift | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Sources/NIO/Selector.swift b/Sources/NIO/Selector.swift
index f8db9bf0..def96a30 100644
--- a/Sources/NIO/Selector.swift
+++ b/Sources/NIO/Selector.swift
@@ -382,8 +382,9 @@ final class Selector<R: Registration> {
             throw IOError(errno: EBADF, reason: "can't wakeup selector as it's not open anymore.")
         }
 #if os(Linux)
-        // TODO: Should we throw an error if it returns != 0 ?
-        let _ = CEventfd.eventfd_write(eventfd, 1)
+        let _ = try wrapSyscall({ $0 == 0 }, function: "eventfd_write") {
+            CEventfd.eventfd_write(eventfd, 1)
+        }
 #else
         var event = kevent()
         event.ident = 0