(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).

1 files changed, 19 insertions, 12 deletions

diff --git a/lisp/time.el b/lisp/time.el
index 8e93bef5e02..371d81578e6 100644
--- 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)