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Port GFileMonitor * hack to Qnil==0 platforms

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Reported by Glenn Morris in: http://bugs.gnu.org/15880#112
* gfilenotify.c (monitor_to_lisp, lisp_to_monitor): New functions.
(dir_monitor_callback, Fgfile_add_watch, Fgfile_rm_watch): Use them.
This commit is contained in:
Paul Eggert 2015-01-07 17:12:16 -08:00
parent ad97127d9c
commit d71659fed4
2 changed files with 30 additions and 10 deletions
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7
src/ChangeLog
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@ -1,3 +1,10 @@
2015-01-08 Paul Eggert <eggert@cs.ucla.edu>
Port GFileMonitor * hack to Qnil==0 platforms
Reported by Glenn Morris in: http://bugs.gnu.org/15880#112
* gfilenotify.c (monitor_to_lisp, lisp_to_monitor): New functions.
(dir_monitor_callback, Fgfile_add_watch, Fgfile_rm_watch): Use them.
2015-01-06 Jan Djärv <jan.h.d@swipnet.se>
* nsterm.m (x_set_window_size): Call updateFrameSize to get real

33
src/gfilenotify.c
View file

@ -31,6 +31,23 @@ along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>. */
static Lisp_Object watch_list;
/* Convert a monitor to a Lisp integer and back. On all known glib
platforms, converting the sum of MONITOR and Lisp_Int0 directly to
a Lisp_Object value results in a Lisp integer, which is safe. */
static Lisp_Object
monitor_to_lisp (GFileMonitor *monitor)
{
return XIL ((intptr_t) monitor + Lisp_Int0);
}
static GFileMonitor *
lisp_to_monitor (Lisp_Object watch_descriptor)
{
intptr_t int_monitor = XLI (watch_descriptor) - Lisp_Int0;
return (GFileMonitor *) int_monitor;
}
/* This is the callback function for arriving signals from
g_file_monitor. It shall create a Lisp event, and put it into
Emacs input queue. */
@ -77,7 +94,7 @@ dir_monitor_callback (GFileMonitor *monitor,
}
/* Determine callback function. */
monitor_object = XIL ((intptr_t) monitor);
monitor_object = monitor_to_lisp (monitor);
eassert (INTEGERP (monitor_object));
watch_object = assq_no_quit (monitor_object, watch_list);
@ -146,7 +163,7 @@ FILE is the name of the file whose event is being reported. FILE1
will be reported only in case of the 'moved' event. */)
(Lisp_Object file, Lisp_Object flags, Lisp_Object callback)
{
Lisp_Object watch_descriptor, watch_object;
Lisp_Object watch_object;
GFile *gfile;
GFileMonitor *monitor;
GFileMonitorFlags gflags = G_FILE_MONITOR_NONE;
@ -176,10 +193,9 @@ will be reported only in case of the 'moved' event. */)
if (! monitor)
xsignal2 (Qfile_notify_error, build_string ("Cannot watch file"), file);
/* On all known glib platforms, converting MONITOR directly to a
Lisp_Object value results is a Lisp integer, which is safe. This
assumption is dicey, though, so check it now. */
watch_descriptor = XIL ((intptr_t) monitor);
Lisp_Object watch_descriptor = monitor_to_lisp (monitor);
/* Check the dicey assumption that monitor_to_lisp is safe. */
if (! INTEGERP (watch_descriptor))
{
g_object_unref (monitor);
@ -203,8 +219,6 @@ DEFUN ("gfile-rm-watch", Fgfile_rm_watch, Sgfile_rm_watch, 1, 1, 0,
WATCH-DESCRIPTOR should be an object returned by `gfile-add-watch'. */)
(Lisp_Object watch_descriptor)
{
intptr_t int_monitor;
GFileMonitor *monitor;
Lisp_Object watch_object = assq_no_quit (watch_descriptor, watch_list);
if (! CONSP (watch_object))
@ -212,8 +226,7 @@ WATCH-DESCRIPTOR should be an object returned by `gfile-add-watch'. */)
watch_descriptor);
eassert (INTEGERP (watch_descriptor));
int_monitor = XLI (watch_descriptor);
monitor = (GFileMonitor *) int_monitor;
GFileMonitor *monitor = lisp_to_monitor (watch_descriptor);
if (!g_file_monitor_cancel (monitor))
xsignal2 (Qfile_notify_error, build_string ("Could not rm watch"),
watch_descriptor);