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-rw-r--r--include/sys/timerfd.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/sys/timerfd.h b/include/sys/timerfd.h
index 9724d903..2794d36a 100644
--- a/include/sys/timerfd.h
+++ b/include/sys/timerfd.h
@@ -12,6 +12,7 @@ extern "C" {
 #define TFD_CLOEXEC O_CLOEXEC
 
 #define TFD_TIMER_ABSTIME 1
+#define TFD_TIMER_CANCEL_ON_SET (1 << 1)
 
 struct itimerspec;