bug#21241: 25.0.50; gfilenotify doesn't indicate when limits are reached

[Tassilo Horn]

When acquiring many file/directory watches using file-notify-add-watch
with file-notify--library being gfilenotify, there's no indication when
the limit of watches a user is allowed to place is reached.  You still
get a valid descriptor but the provided callback function won't be
called when the watched file/directory changes.

I've looked at the code and saw that with inotify you'd get an error.
Apparently, gfilenotify (aka glib) also uses inotify on my GNU/Linux box
under the hoods.  At least increasing the inotify limit for user watches
made it work again.

I tried looking at the GFileMonitor API docs.  It seems that
g_file_monitor should return NULL on errors (and I'd count a reached
limit an error), and the fourth parameter should be initialized with the
error.  Emacs calls it with no error parameter:

  monitor = g_file_monitor (gfile, gflags, NULL, NULL);

So I've tried the following:

--8<---------------cut here---------------start------------->8---
diff --git a/src/gfilenotify.c b/src/gfilenotify.c
index 08713a8..2ad2110 100644
--- a/src/gfilenotify.c
+++ b/src/gfilenotify.c
@@ -172,8 +172,9 @@ will be reported only in case of the 'moved' event.  */)
     gflags |= G_FILE_MONITOR_SEND_MOVED;
 
   /* Enable watch.  */
-  monitor = g_file_monitor (gfile, gflags, NULL, NULL);
-  if (! monitor)
+  GError *err = NULL;
+  monitor = g_file_monitor (gfile, gflags, NULL, &err);
+  if (! monitor || err != NULL)
     xsignal2 (Qfile_notify_error, build_string ("Cannot watch file"), file);
 
   Lisp_Object watch_descriptor = make_pointer_integer (monitor);
--8<---------------cut here---------------end--------------->8---

Unfortunately, the err variable won't be set in case the limit is
reached, too.  So it seems that we can't do much from Emacs land and
this should be reported as a glib bug (which I'll do).

Well, one thing we could do was preferring plain inotify over glib's
GFileMonitor when both are available.  On my GNU/Linux box both are
available and configure chose gfilenotify as the default.



In GNU Emacs 25.0.50.3 (x86_64-unknown-linux-gnu, GTK+ Version 3.16.6)
 of 2015-08-12 on thinkpad-t440p
Repository revision: 197f280042a4d901ea94acdf10f1dc544fae4750
Windowing system distributor `The X.Org Foundation', version 11.0.11702000
System Description:     Arch Linux

Configured using:
 `configure 'CFLAGS=-g -ggdb3 -O1''

Configured features:
XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
NOTIFY ACL GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
TOOLKIT_SCROLL_BARS GTK3 X11

Important settings:
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20150812T095021.255> Opening nnml server on 
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20150812T095021.256> Reading active file from 
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rcirc-late-fix rcirc hl-line nndraft nnmh rot13 utf-7 gnutls
network-stream nsm starttls nnml nnnil gnus-agent gnus-srvr gnus-score
score-mode nnvirtual gnus-cache gnus-demon nntp spam spam-stat gnus-uu
yenc gnus-msg gnus-gravatar mail-extr gravatar gnus-topic nnir
gnus-registry registry eieio-compat eieio-base th-private colir color
smex ido company-files company-oddmuse company-keywords company-etags
company-gtags company-dabbrev-code company-dabbrev company-capf
company-cmake company-xcode company-clang company-semantic company-eclim
company-template company-css company-nxml company-bbdb company
stratego-mode greql-mode tg-mode generic preview-latex tex-site
auto-loads cider cider-debug cider-browse-ns cider-inspector cider-mode
cider-repl cider-eldoc cider-interaction arc-mode archive-mode
cider-overlays cider-doc org-table org org-macro org-footnote
org-pcomplete org-list org-faces org-entities org-version ob-emacs-lisp
ob ob-tangle ob-ref ob-lob ob-table ob-exp org-src ob-keys ob-comint
ob-core ob-eval org-compat org-macs org-loaddefs find-func cal-menu
calendar cal-loaddefs cider-test cider-stacktrace cider-client
nrepl-client queue cider-util ewoc etags xref project clojure-mode
paredit aggressive-indent epa-file epa epg rdictcc
google-contacts-message google-contacts derived xml url-cache
google-oauth google-contacts-gnus gnus-art mm-uu mml2015 mm-view
mml-smime smime dig gnus-sum gnus-group gnus-undo gnus-start gnus-cloud
nnimap nnmail mail-source tls utf7 netrc nnoo parse-time gnus-spec
gnus-int gnus-range gnus-win gnus gnus-ems gnus-compat url url-proxy
url-privacy url-expand url-methods url-history url-cookie url-domsuf
url-util url-parse url-vars mailcap nnheader dired-x em-term term ehelp
esh-opt esh-ext esh-util highlight-symbol thingatpt boxquote rect
ecomplete yasnippet disp-table noutline outline pdf-occur ibuf-ext
ibuffer tablist tablist-filter semantic/wisent/comp semantic/wisent
semantic/wisent/wisent semantic/util-modes semantic/util semantic
semantic/tag semantic/lex semantic/fw mode-local cedet pdf-isearch
let-alist pdf-misc imenu pdf-tools compile cus-edit cus-start cus-load
pdf-view bookmark pp jka-compr pdf-cache pdf-info tq pdf-util image-mode
browse-kill-ring recentf tree-widget wid-edit highlight-parentheses cl
undo-tree diff iedit iedit-lib hydra lv counsel swiper cap-words
superword subword saveplace savehist paren ivy delsel icomplete mb-depth
ace-window avy magit-filenotify filenotify magit-blame magit-stash
magit-bisect magit-remote magit-commit magit-sequence magit magit-apply
magit-wip magit-log magit-diff smerge-mode diff-mode magit-core
magit-process magit-popup magit-mode magit-git crm magit-section
magit-utils git-commit log-edit easy-mmode message dired rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 rfc2047 rfc2045
ietf-drums mailabbrev mail-utils gmm-utils mailheader pcvs-util add-log
with-editor async-bytecomp async tramp-sh tramp tramp-compat auth-source
eieio byte-opt bytecomp byte-compile cl-extra seq cconv eieio-core
cl-macs gv gnus-util mm-util help-fns help-mode mail-prsvr
password-cache tramp-loaddefs trampver shell pcomplete comint ansi-color
ring format-spec server dash smart-mode-line-respectful-theme
smart-mode-line-light-theme cl-seq smart-mode-line rich-minority rx bs
elec-pair edmacro kmacro cl-loaddefs cl-lib gnus-load subr-x pcase
tsdh-light-theme finder-inf memory-usage-autoloads advice info package
easymenu epg-config time-date mule-util tooltip eldoc electric uniquify
ediff-hook vc-hooks lisp-float-type mwheel x-win term/common-win x-dnd
tool-bar dnd fontset image regexp-opt fringe tabulated-list newcomment
elisp-mode lisp-mode prog-mode register page menu-bar rfn-eshadow timer
select scroll-bar mouse jit-lock font-lock syntax facemenu font-core
frame cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan
thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote dbusbind gfilenotify
dynamic-setting system-font-setting font-render-setting move-toolbar gtk
x-toolkit x multi-tty make-network-process emacs)

Memory information:
((conses 16 2203543 130351)
 (symbols 48 58842 76)
 (miscs 40 808 1443)
 (strings 32 181035 59773)
 (string-bytes 1 6176131)
 (vectors 16 61077)
 (vector-slots 8 1970775 197250)
 (floats 8 963 1376)
 (intervals 56 18899 3078)
 (buffers 976 73)
 (heap 1024 134316 38901))