waitfd: dynamically decide the syscall number

emper/sleep_strategy/WaitfdSleepStrategy.hpp

@@ -14,13 +14,21 @@
 #include "FiberHint.hpp"
 #include "emper-common.h"
 #include "emper-config.h"	 // IWYU pragma: keep
+#include "lib/LinuxVersion.hpp"
 #include "sleep_strategy/AbstractIoSleepStrategy.hpp"
 #include "sleep_strategy/AbstractWorkerSleepStrategy.hpp"
 
 class Runtime;
 
 #ifndef __NR_waitfd
-#define __NR_waitfd 450
+static const unsigned __NR_waitfd = []() -> unsigned {
+	if (EMPER_LINUX_GE("5.17"))
+		return 451;
+	else if (EMPER_LINUX_GE("5.16"))
+		return 450;
+	else
+		return 449;
+}();
 #endif
 
 namespace emper::sleep_strategy {