Support filesystem notification through inotify on GNU/Linux.

 configure.ac (inotify): New option.
 (HAVE_INOTIFY): Test for inotify.

 src/termhooks.h (enum event_kind) [HAVE_INOTIFY]: Add
 FILE_NOTIFY_EVENT.
 src/lisp.h (syms_of_inotify) [HAVE_INOTIFY]: Add prototype.
 src/keyboard.c (Qfile_inotify) [HAVE_INOTIFY]: New variable.
 (syms_of_keyboard): DEFSYM it.
 (kbd_buffer_get_event) [HAVE_INOTIFY]: Generate FILE_NOTIFY_EVENT.
 (make_lispy_event): Support FILE_NOTIFY_EVENT by generating
 Qfile_inotify events.
 (keys_of_keyboard) [HAVE_INOTIFY]: Bind file-inotify events in
 special-event-map to inotify-handle-event.
 src/emacs.c (main) [HAVE_INOTIFY]: Call syms_of_inotify.
 src/Makefile.in (base_obj): Add inotify.o.
 src/inotify.c: New file.

 lisp/subr.el (inotify-event-p, inotify-handle-event): New functions.

 test/automated/inotify-test.el: New test.

2 files changed, 64 insertions, 0 deletions

diff --git a/test/ChangeLog b/test/ChangeLog
index 21f0f29b73b..7633d974f57 100644
--- a/test/ChangeLog
+++ b/test/ChangeLog
@@ -1,3 +1,7 @@
+2012-12-10  Rüdiger Sonderfeld  <ruediger@c-plusplus.de>
+
+	* automated/inotify-test.el: New test.
+
 2012-12-02  Chong Yidong  <cyd@gnu.org>
 
 	* automated/ruby-mode-tests.el
diff --git a/test/automated/inotify-test.el b/test/automated/inotify-test.el
new file mode 100644
index 00000000000..edda7ef0418
--- /dev/null
+++ b/test/automated/inotify-test.el
@@ -0,0 +1,60 @@
+;;; inotify-tests.el --- Test suite for inotify. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2012 Free Software Foundation, Inc.
+
+;; Author: Rüdiger Sonderfeld <ruediger@c-plusplus.de>
+;; Keywords:       internal
+;; Human-Keywords: internal
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(require 'ert)
+
+(when (featurep 'inotify)
+
+  ;; (ert-deftest filewatch-file-watch-aspects-check ()
+  ;;   "Test whether `file-watch' properly checks the aspects."
+  ;;   (let ((temp-file (make-temp-file "filewatch-aspects")))
+  ;;     (should (stringp temp-file))
+  ;;     (should-error (file-watch temp-file 'wrong nil)
+  ;;                   :type 'error)
+  ;;     (should-error (file-watch temp-file '(modify t) nil)
+  ;;                   :type 'error)
+  ;;     (should-error (file-watch temp-file '(modify all-modify) nil)
+  ;;                   :type 'error)
+  ;;     (should-error (file-watch temp-file '(access wrong modify) nil)
+  ;;                   :type 'error)))
+
+  (ert-deftest inotify-file-watch-simple ()
+    "Test if watching a normal file works."
+    (let ((temp-file (make-temp-file "inotify-simple"))
+	   (events 0))
+      (let ((wd
+	     (inotify-add-watch temp-file t (lambda (ev)
+                                              (setq events (1+ events))))))
+	(unwind-protect
+	    (progn
+	      (with-temp-file temp-file
+		(insert "Foo\n"))
+	      (sit-for 5) ;; Hacky. Wait for 5s until events are processed
+	      (should (> events 0)))
+	  (inotify-rm-watch wd)))))
+)
+
+(provide 'inotify-tests)
+;;; inotify-tests.el ends here.