[Emacs-diffs] emacs/lisp simple.el

[Michael Albinus]

CVSROOT:        /sources/emacs
Module name:    emacs
Changes by:     Michael Albinus <albinus>       09/08/25 08:45:41

Modified files:
        lisp           : simple.el 

Log message:
        * simple.el (process-file-side-effects): New defvar.

CVSWeb URLs:
http://cvs.savannah.gnu.org/viewcvs/emacs/lisp/simple.el?cvsroot=emacs&r1=1.1004&r2=1.1005

Patches:
Index: simple.el
===================================================================
RCS file: /sources/emacs/emacs/lisp/simple.el,v
retrieving revision 1.1004
retrieving revision 1.1005
diff -u -b -r1.1004 -r1.1005
--- simple.el   19 Aug 2009 02:32:02 -0000      1.1004
+++ simple.el   25 Aug 2009 08:45:41 -0000      1.1005
@@ -2513,6 +2513,17 @@
       (when stderr-file (delete-file stderr-file))
       (when lc (delete-file lc)))))
 
+(defvar process-file-side-effects t
+  "Whether a call of `process-file' changes remote files.
+
+Per default, this variable is always set to `t', meaning that a
+call of `process-file' could potentially change any file on a
+remote host.  When set to `nil', a file handler could optimize
+its behaviour with respect to remote file attributes caching.
+
+This variable should never be changed by `setq'.  Instead of, it
+shall be set only by let-binding.")
+
 (defun start-file-process (name buffer program &rest program-args)
   "Start a program in a subprocess.  Return the process object for it.