Introduce `file-notify-valid-p'

* lisp/filenotify.el (file-notify-valid-p): New defun.
(gfile-valid-p, w32notify-valid-p): Make them an alias to `identity'.

* lisp/net/tramp-adb.el (tramp-adb-file-name-handler-alist)
* lisp/net/tramp-gvfs.el (tramp-gvfs-file-name-handler-alist)
* lisp/net/tramp-sh.el (tramp-sh-file-name-handler-alist)
* lisp/net/tramp-smb.el (tramp-smb-file-name-handler-alist)
<file-notify-valid-p>: Add handler.

* lisp/net/tramp.el (tramp-file-name-for-operation):
Add `file-notify-valid-p'.
(tramp-handle-file-notify-valid-p): New defun.

* src/inotify.c (Finotify_valid_p): New defun.
(syms_of_inotify): Declare Sinotify_valid_p.

1 files changed, 11 insertions, 0 deletions

diff --git a/src/inotify.c b/src/inotify.c
index eddad73e8f7..b73e8733829 100644
--- a/src/inotify.c
+++ b/src/inotify.c
@@ -367,6 +367,16 @@ See inotify_rm_watch(2) for more information.
   return Qt;
 }
 
+DEFUN ("inotify-valid-p", Finotify_valid_p, Sinotify_valid_p, 1, 1, 0,
+       doc: /* "Check a watch specified by its WATCH-DESCRIPTOR.
+
+WATCH-DESCRIPTOR should be an object returned by `inotify-add-watch'.  */)
+     (Lisp_Object watch_descriptor)
+{
+  Lisp_Object watch_object = Fassoc (watch_descriptor, watch_list);
+  return NILP (watch_object) ? Qnil : Qt;
+}
+
 void
 syms_of_inotify (void)
 {
@@ -401,6 +411,7 @@ syms_of_inotify (void)
 
   defsubr (&Sinotify_add_watch);
   defsubr (&Sinotify_rm_watch);
+  defsubr (&Sinotify_valid_p);
 
   staticpro (&watch_list);