Показать man функции, которая щас под курсором.

(require 'thingatpt)

(defun man-at-point ()
(interactive)
(let ((sym (symbol-at-point)))
(message (format "Showing man for %s ..." sym))
(man (symbol-name sym))))

(defun my-c-stuff ()
;; blah blah
(local-set-key (kbd "C-c C-m") 'man-at-point))

(add-hook 'c-mode-common-hook 'my-c-stuff)