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

1 files changed, 39 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 7b7590813..0e1c6b8bf 100644
--- a/configure.ac
+++ b/configure.ac
@@ -143,6 +143,33 @@ 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
 #
 AC_ARG_WITH(
@@ -1139,6 +1166,18 @@ case $enable_packetver_re in
 esac
 
 #
+# Epoll
+#
+case $have_linux_epoll in
+	"yes")
+		CPPFLAGS="$CPPFLAGS -DSOCKET_EPOLL"
+		;;
+	"no")
+		# default value
+		;;
+esac
+
+#
 # Obfuscation keys
 #
 if test -n "$obfuscationkey1" -a -n "$obfuscationkey2" -a -n "$obfuscationkey3"; then