From d6826546c4703d3a459dbf5f1f9453793e96a008 Mon Sep 17 00:00:00 2001
From: Ken Brown <kbrown@cornell.edu>
Date: Sat, 9 Mar 2019 17:06:54 -0500
Subject: [PATCH] Use a runtime test for timerfd on Cygwin (Bug#34618)

* src/atimer.c [HAVE_TIMERFD] (have_buggy_timerfd): New
function.
(init_atimer) Use it.
---
 src/atimer.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/src/atimer.c b/src/atimer.c
index d36c4f1f5a3..8387b8aa0e0 100644
--- a/src/atimer.c
+++ b/src/atimer.c
@@ -28,7 +28,10 @@ along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.  */
 
 #ifdef HAVE_TIMERFD
 #include <errno.h>
-# include <sys/timerfd.h>
+#include <sys/timerfd.h>
+# ifdef CYGWIN
+# include <sys/utsname.h>
+# endif
 #endif
 
 #ifdef MSDOS
@@ -557,13 +560,28 @@ Return t if all self-tests are passed, nil otherwise.  */)
 
 #endif /* ENABLE_CHECKING */
 
+/* Cygwin has the timerfd interface starting with release 3.0.0, but
+   it is buggy until release 3.0.2. */
+#ifdef HAVE_TIMERFD
+static bool
+have_buggy_timerfd (void)
+{
+# ifdef CYGWIN
+  struct utsname name;
+  return uname (&name) < 0 || strverscmp (name.release, "3.0.2") < 0;
+# else
+  return false;
+# endif
+}
+#endif
+
 void
 init_atimer (void)
 {
 #ifdef HAVE_ITIMERSPEC
 # ifdef HAVE_TIMERFD
   /* Until this feature is considered stable, you can ask to not use it.  */
-  timerfd = (egetenv ("EMACS_IGNORE_TIMERFD") ? -1 :
+  timerfd = (egetenv ("EMACS_IGNORE_TIMERFD") || have_buggy_timerfd () ? -1 :
 	     timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK | TFD_CLOEXEC));
 # endif
   if (timerfd < 0)
-- 
2.39.2