VTYSH命令

• DEFPY
• DEFUN
• 对比
• • DEFUN和DEFPY区别

定义

#define DEFPY(funcname, cmdname, cmdstr, helpstr)                              
	DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, 0, 0)            
	funcdecl_##funcname

cmdname 结构体定义、初始化

#define DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, attrs, dnum)     
	static struct cmd_element cmdname = {                                  
		.string = cmdstr,                                              
		.func = funcname,                                              
		.doc = helpstr,                                                
		.attr = attrs,                                                 
		.daemon = dnum,                                                
		.name = #cmdname,                                              
	};

#define DEFUN(funcname, cmdname, cmdstr, helpstr)                              
	DEFUN_CMD_FUNC_DECL(funcname)                                          
	DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, 0, 0)            
	DEFUN_CMD_FUNC_TEXT(funcname)

funcname 声明

#define DEFUN_CMD_FUNC_DECL(funcname)                                          
	static int funcname(const struct cmd_element *, struct vty *, int,     
			    struct cmd_token *[]);

cmdname 结构体定义、初始化

#define DEFUN_CMD_ELEMENT(funcname, cmdname, cmdstr, helpstr, attrs, dnum)     
	static struct cmd_element cmdname = {                                  
		.string = cmdstr,                                              
		.func = funcname,                                              
		.doc = helpstr,                                                
		.attr = attrs,                                                 
		.daemon = dnum,                                                
		.name = #cmdname,                                              
	};

#define DEFUN_CMD_FUNC_TEXT(funcname)                                          
	static int funcname(const struct cmd_element *self                     
			    __attribute__((unused)),                           
			    struct vty *vty __attribute__((unused)),           
			    int argc __attribute__((unused)),                  
			    struct cmd_token *argv[] __attribute__((unused)))

DEFUN 和 DEFPY 都可以定义命令。DEFPY(...) 是 DEFUN() 的增强版，由python/clidef.py进行预处理。python脚本解析命令定义字符串，提取变量名称和类型，并生成一个C语言包装函数，解析变量并传递给它们。这意味着在CLI函数体中，你将收到具有适当类型的额外参数。

参考资料：
FRRouting Developer’s Guide