Added libc code

include/sys/event.h

@@ -0,0 +1,48 @@
+// Zak's kqueue implementation
+#ifndef SYS_EVENT_H
+#define SYS_EVENT_H
+
+#include <stdint.h>
+
+// The kevent structure is used for waiting/receiving notifications.
+struct kevent {
+  uintptr_t ident;
+  int16_t filter;
+  uint16_t flags;
+  uint32_t fflags;
+  int64_t data;
+  void* udata;
+  uint64_t ext[4];
+};
+
+// kqueue1 is the kqueue system call with a flags argument,
+// as defined on NetBSD & OpenBSD.
+int kqueue1(int flags);
+
+// kqueue() without flags is equivalent to kqueue1(0)
+#define kqueue() kqueue1(0)
+
+// On FreeBSD, kqueue1 is also known as kqueuex
+#define kqueuex(flags) kqueue1(flags)
+
+// After creating a kqueue, kevent is the main syscall used.
+// This accepts a list of changes and can receive multiple events.
+int kevent(int queue, const struct kevent* changes, int nch, struct kevent* events, int nev, void* todo_timeout);
+
+// The EV_SET() macro is for initialising a struct kevent*
+#define EV_SET(ev,idn,flt,flg,ffl,dat,udt) \
+  do { \
+    (ev)->ident = idn; \
+    (ev)->filter = flt; \
+    (ev)->flags = flg; \
+    (ev)->fflags = ffl; \
+    (ev)->data = dat; \
+    (ev)->udata = udt; \
+    (ev)->ext[0] = 0; \
+    (ev)->ext[1] = 0; \
+    (ev)->ext[2] = 0; \
+    (ev)->ext[3] = 0; \
+  } while(0)
+
+// From ifndef at top of file:
+#endif