(display-time): make it work under ms-dos by setting the

`dos-display-time' variable instead of invoking `wakeup' as
asynchronous process (which doesn't work under ms-dos).

diff --git a/lisp/time.el b/lisp/time.el
index 8e93bef5e020c5f80bc32da0a96cee6a8a223ab1..371d81578e6e348cd85c84f67842bf4cbb65a5a9 100644 (file)
--- a/lisp/time.el
+++ b/lisp/time.el
@@ -62,8 +62,9 @@ If `display-time-day-and-date' is non-nil, the current day and date
 are displayed as well.
 After each update, `display-time-hook' is run with `run-hooks'."
   (interactive)
-  (let ((live (and display-time-process
-                  (eq (process-status display-time-process) 'run))))
+  (let ((live (or (and (eq system-type 'ms-dos) dos-display-time)
+                 (and display-time-process
+                      (eq (process-status display-time-process) 'run)))))
     (if (not live)
        (progn
          (if display-time-process
@@ -73,16 +74,22 @@ After each update, `display-time-hook' is run with `run-hooks'."
              (setq global-mode-string
                    (append global-mode-string '(display-time-string))))
          (setq display-time-string "")
-         ;; Using a pty is wasteful, and the separate session causes
-         ;; annoyance sometimes (some systems kill idle sessions).
-         (let ((process-connection-type nil))
-           (setq display-time-process
-                 (start-process "display-time" nil
-                                (expand-file-name "wakeup" exec-directory)
-                                (int-to-string display-time-interval))))
-         (process-kill-without-query display-time-process)
-         (set-process-sentinel display-time-process 'display-time-sentinel)
-         (set-process-filter display-time-process 'display-time-filter)))))
+         (if (eq system-type 'ms-dos)
+             (setq dos-display-time t)
+           ;; Using a pty is wasteful, and the separate session causes
+           ;; annoyance sometimes (some systems kill idle sessions).
+           (progn
+             (let ((process-connection-type nil))
+               (setq display-time-process
+                     (start-process "display-time" nil
+                                    (expand-file-name
+                                     "wakeup" exec-directory)
+                                    (int-to-string display-time-interval))))
+             (process-kill-without-query display-time-process)
+             (set-process-sentinel display-time-process
+                                   'display-time-sentinel)
+             (set-process-filter   display-time-process
+                                   'display-time-filter)))))))
 
 (defun display-time-sentinel (proc reason)
   (or (eq (process-status proc) 'run)