Add reboot(2)

include/sys/reboot.h

@@ -0,0 +1,4 @@
+#pragma once
+#include <ygg/reboot.h>
+
+int reboot(int magic, int magic2, unsigned int cmd, void *arg);

src/sys/reboot.c

@@ -0,0 +1,8 @@
+#include <_libc/syscalls.h>
+#include <ygg/syscall.h>
+#include <sys/reboot.h>
+#include <errno.h>
+
+int reboot(int magic, int magic2, unsigned int cmd, void *arg) {
+    return SET_ERRNO(int, __syscall4(SYSCALL_NR_REBOOT, magic, magic2, cmd, (long) arg));
+}