🆕 errno.h and unistd.h

kernel/common/unistd.h

@@ -0,0 +1,14 @@
+/**
+ * @file unistd.h
+ * @author fslongjin (longjin@RinGoTek.cn)
+ * @brief
+ * @version 0.1
+ * @date 2022-04-22
+ *
+ * @copyright Copyright (c) 2022
+ *
+ */
+#pragma once
+
+#include <syscall/syscall.h>
+#include <syscall/syscall_num.h>