From c6f05662899417ad22c4fa3217e6c2ba2d27b5a3 Mon Sep 17 00:00:00 2001
From: Florian Wilkemeyer <fw@f-ws.de>
Date: Sun, 10 Jan 2016 10:56:22 +0100
Subject: Added epoll as event-dispatcher on linux (instead of select())

Note:
It will be enabled by default if configure detects that the system has support for epoll
To enforce usage of select run configure with --enable-epoll=no
---
 configure.ac | 39 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 39 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 7b7590813..0e1c6b8bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -142,6 +142,33 @@ AC_ARG_ENABLE(
 )
 
 
+#
+# Epoll
+#
+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
+
+
 #
 # Obfuscation keys
 #
@@ -1138,6 +1165,18 @@ case $enable_packetver_re in
 		;;
 esac
 
+#
+# Epoll
+#
+case $have_linux_epoll in
+	"yes")
+		CPPFLAGS="$CPPFLAGS -DSOCKET_EPOLL"
+		;;
+	"no")
+		# default value
+		;;
+esac
+
 #
 # Obfuscation keys
 #
-- 
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