Kernel: Implement linux's eventfd

userspace/libraries/LibC/include/sys/eventfd.h

@@ -0,0 +1,16 @@
+#ifndef _SYS_EVENTFD_H
+#define _SYS_EVENTFD_H 1
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define EFD_CLOEXEC   0x1
+#define EFD_NONBLOCK  0x2
+#define EFD_SEMAPHORE 0x4
+
+int eventfd(unsigned int initval, int flags);
+
+__END_DECLS
+
+#endif