[Minor] Fix usage of signalfd and timerfd

contrib/libev/CMakeLists.txt

@@ -38,7 +38,10 @@ IF(HAVE_SYS_EVENTFD_H)
 	CHECK_SYMBOL_EXISTS(eventfd sys/eventfd.h HAVE_EVENTFD)
 ENDIF()
 IF(HAVE_SYS_SIGNALFD_H)
-	CHECK_SYMBOL_EXISTS(signalfd sys/signalfd.h HAVE_EVENTFD)
+	CHECK_SYMBOL_EXISTS(signalfd sys/signalfd.h HAVE_SIGNALFD)
+ENDIF()
+IF(HAVE_SYS_TIMERFD_H)
+	CHECK_SYMBOL_EXISTS(timerfd_create sys/timerfd.h HAVE_TIMERFD)
 ENDIF()
 IF(HAVE_LINUX_FS_H)
 	CHECK_SYMBOL_EXISTS(RWF_SUPPORTED linux/fs.h HAVE_KERNEL_RWF_T)

contrib/libev/config.h.in

@@ -63,6 +63,9 @@
 /* Define to 1 if you have the `signalfd' function. */
 #cmakedefine HAVE_SIGNALFD 1
 
+/* Define to 1 if you have the `timerfd_create' function. */
+#cmakedefine HAVE_TIMERFD 1
+
 /* Define to 1 if you have the <stdint.h> header file. */
 #cmakedefine HAVE_STDINT_H 1
 

contrib/libev/ev.c

@@ -184,7 +184,7 @@
 #  define EV_USE_EVENTFD 0
 # endif
 
-# if HAVE_SYS_TIMERFD_H
+# if HAVE_SYS_TIMERFD_H && HAVE_TIMERFD
 #  ifndef EV_USE_TIMERFD
 #   define EV_USE_TIMERFD EV_FEATURE_OS
 #  endif