emacs etags 查看.c .h文件

* 生成TAGS文件

find . -name '*.[ch]' -print | etags -

* M - .  go to definition

https://www.emacswiki.org/emacs/EmacsTags

* jump back

C-u C-SPC locally, C-x C-SPC globally 

https://stackoverflow.com/questions/22589339/how-to-jump-back-from-find-tag-in-emacs

http://ryo1miya.hatenablog.com/entry/20110613/1307980874