dnl Checks for header files.
AC_HEADER_STDC
-AC_CHECK_HEADERS(poll.h sys/devpoll.h sys/event.h)
+AC_CHECK_HEADERS(poll.h sys/devpoll.h sys/epoll.h sys/event.h)
dnl Checks for typedefs, structures, and compiler characteristics
dnl AC_C_CONST
ENGINE_C="engine_kqueue.c $ENGINE_C"
fi
+dnl --disable-epoll check
+AC_MSG_CHECKING([whether to enable the epoll event engine])
+AC_ARG_ENABLE([epoll],
+[ --disable-epoll Disable the epoll-based engine],
+[unet_cv_enable_epoll=$enable_epoll],
+[AC_CACHE_VAL(unet_cv_enable_epoll,
+[unet_cv_enable_epoll=yes])])
+
+if test x"$ac_cv_header_sys_epoll_h" = xno -o x"$ac_cv_func_epoll" = xno; then
+ unet_cv_enable_epoll=no
+fi
+
+AC_MSG_RESULT([$unet_cv_enable_epoll])
+
+dnl If we have the header and user has not refused epoll, we still need
+dnl to check whether the functions are properly defined.
+if test x"$unet_cv_enable_epoll" != xno; then
+ AC_MSG_CHECKING([whether epoll functions are properly defined])
+ AC_LINK_IFELSE([AC_LANG_PROGRAM([#include <sys/epoll.h>], [epoll_create(10);])],
+ [AC_MSG_RESULT([yes])],
+ [AC_MSG_RESULT([no])
+ AC_DEFINE([EPOLL_NEED_BODY],,[Define to implement epoll system calls])])
+ AC_DEFINE([USE_EPOLL], , [Define to enable the epoll engine])
+ ENGINE_C="engine_epoll.c $ENGINE_C"
+fi
+
dnl --disable-adns check...
AC_MSG_CHECKING([whether to enable the adns resolver engine])
AC_ARG_ENABLE([adns],