From cde0a892935d408967ea3a3abcb2fc6ab950e414 Mon Sep 17 00:00:00 2001
From: Simon McVittie <simon.mcvittie@collabora.co.uk>
Date: Tue, 25 Jan 2011 18:29:40 +0000
Subject: [PATCH 2/5] Check for epoll in configure.ac

---
 configure.in |   24 ++++++++++++++++++++++++
 1 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/configure.in b/configure.in
index 6dd2a8d..9c28a71 100644
--- a/configure.in
+++ b/configure.in
@@ -911,6 +911,30 @@ fi
 
 AM_CONDITIONAL(DBUS_BUS_ENABLE_DNOTIFY_ON_LINUX, test x$have_dnotify = xyes)
 
+AC_ARG_ENABLE([epoll],
+              [AS_HELP_STRING([--enable-epoll],[use epoll(4) on Linux])],
+              [enable_epoll=$enableval], [enable_epoll=auto])
+if test x$enable_epoll = xno; then
+    have_linux_epoll=no
+else
+    AC_MSG_CHECKING([for Linux epoll(4)])
+    AC_LINK_IFELSE([AC_LANG_PROGRAM(
+        [
+        #ifndef __linux__
+        #error This is not Linux
+        #endif
+        #include <sys/epoll.h>
+        ],
+        [epoll_create1 (EPOLL_CLOEXEC);])],
+        [have_linux_epoll=yes],
+        [have_linux_epoll=no])
+    AC_MSG_RESULT([$have_linux_epoll])
+fi
+if test x$enable_epoll,$have_linux_epoll = xyes,no; then
+    AC_MSG_ERROR([epoll support explicitly enabled but not available])
+fi
+AM_CONDITIONAL([HAVE_LINUX_EPOLL], [test x$have_linux_epoll = xyes])
+
 # kqueue checks
 if test x$enable_kqueue = xno ; then
     have_kqueue=no
-- 
1.7.2.3