Kernel/LibC: Implement flock

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

@@ -0,0 +1,17 @@
+#ifndef _SYS_FILE_H
+#define _SYS_FILE_H 1
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define LOCK_UN 0
+#define LOCK_EX 1
+#define LOCK_SH 2
+#define LOCK_NB 4
+
+int flock(int fd, int op);
+
+__END_DECLS
+
+#endif