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

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

@@ -119,6 +119,7 @@ __BEGIN_DECLS
 	O(SYS_GETGROUPS,		getgroups)		\
 	O(SYS_SETGROUPS,		setgroups)		\
 	O(SYS_CHROOT,			chroot)			\
+	O(SYS_EVENTFD,			eventfd)		\
 
 enum Syscall
 {

userspace/libraries/LibC/sys/eventfd.cpp

@@ -0,0 +1,8 @@
+#include <sys/eventfd.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+int eventfd(unsigned int initval, int flags)
+{
+	return syscall(SYS_EVENTFD, initval, flags);
+}