Fix Bug#22814

* lisp/autorevert.el (global-auto-revert-mode): Do not set
`auto-revert-use-notify' to nil.

* etc/NEWS: Mention this.

* etc/PROBLEMS: Remove problem Bug#22814.

* src/kqueue.c: Include <sys/resource.h>.
(Fkqueue_add_watch): Limit the number of used file descriptors.
(Bug#22814)

* test/lisp/filenotify-tests.el (file-notify--test-remote-enabled)
(file-notify-test00-availability, file-notify-test01-add-watch)
(file-notify-test02-events, file-notify-test06-many-events):
Use #' read syntax for functions.
(file-notify-test05-dir-validity)
(file-notify-test06-many-events): Simplify directory creation.
(file-notify-test09-sufficient-ressources): New test.

2 files changed, 3 insertions, 11 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 172577601af..d7e1b839895 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -114,6 +114,9 @@ different group ID.
 +++
 *** New connection method "doas" for OpenBSD hosts.
 
+---
+** `auto-revert-use-notify' is set back to t in `global-auto-revert-mode'.
+
 
 * New Modes and Packages in Emacs 25.2
 
diff --git a/etc/PROBLEMS b/etc/PROBLEMS
index d5313677113..7d780371d46 100644
--- a/etc/PROBLEMS
+++ b/etc/PROBLEMS
@@ -600,17 +600,6 @@ you have a personal configuration file (normally ~/.aspell.conf), it
 can cause this error.  Remove that file, execute 'ispell-kill-ispell'
 in Emacs, and then try spell-checking again.
 
-*** Emacs eats all file descriptors when using kqueue file notifications.
-See <http://debbugs.gnu.org/22814>.
-
-When you have a large number of buffers running auto-revert-mode, and
-Emacs is configured to use the kqueue file notification library, it
-uses an own file descriptor for every watched file.  On systems with a
-small limit of file descriptors allowed per process, like OS X, you
-could run out of file descriptors.  You won't be able to open new files.
-
-auto-revert-use-notify is set to nil in global-auto-revert-mode, therefore.
-
 * Runtime problems related to font handling
 
 ** Characters are displayed as empty boxes or with wrong font under X.