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ab179184b8
Removing the event and closing the related file descriptor must be done first to make sure the kqueue subsystem delete pending events. The timeout must be disarmed before freeing the directory dependency list otherwise it might populate it again. https://bugzilla.gnome.org/show_bug.cgi?id=795193
439 lines
12 KiB
C
439 lines
12 KiB
C
/*******************************************************************************
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Copyright (c) 2011, 2012 Dmitry Matveev <me@dmitrymatveev.co.uk>
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*******************************************************************************/
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#include "config.h"
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#include <sys/types.h>
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#include <sys/event.h>
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#include <sys/time.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <glib-object.h>
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#include <gio/gfilemonitor.h>
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#include <gio/glocalfilemonitor.h>
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#include <gio/giomodule.h>
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#include <gio/gpollfilemonitor.h>
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#include <gio/gfile.h>
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#include <glib-unix.h>
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#include "glib-private.h"
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#include "kqueue-helper.h"
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#include "dep-list.h"
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G_LOCK_DEFINE_STATIC (kq_lock);
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static GSource *kq_source;
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static int kq_queue = -1;
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#define G_TYPE_KQUEUE_FILE_MONITOR (g_kqueue_file_monitor_get_type ())
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#define G_KQUEUE_FILE_MONITOR(inst) (G_TYPE_CHECK_INSTANCE_CAST ((inst), \
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G_TYPE_KQUEUE_FILE_MONITOR, GKqueueFileMonitor))
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typedef GLocalFileMonitorClass GKqueueFileMonitorClass;
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typedef struct
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{
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GLocalFileMonitor parent_instance;
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kqueue_sub *sub;
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#ifndef O_EVTONLY
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GFileMonitor *fallback;
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GFile *fbfile;
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#endif
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} GKqueueFileMonitor;
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GType g_kqueue_file_monitor_get_type (void);
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G_DEFINE_TYPE_WITH_CODE (GKqueueFileMonitor, g_kqueue_file_monitor, G_TYPE_LOCAL_FILE_MONITOR,
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g_io_extension_point_implement (G_LOCAL_FILE_MONITOR_EXTENSION_POINT_NAME,
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g_define_type_id,
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"kqueue",
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20))
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#ifndef O_EVTONLY
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#define O_KQFLAG O_RDONLY
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#else
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#define O_KQFLAG O_EVTONLY
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#endif
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#define NOTE_ALL (NOTE_DELETE|NOTE_WRITE|NOTE_EXTEND|NOTE_ATTRIB|NOTE_RENAME)
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static gboolean g_kqueue_file_monitor_cancel (GFileMonitor* monitor);
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static gboolean g_kqueue_file_monitor_is_supported (void);
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static kqueue_sub *_kqsub_new (const gchar *, GLocalFileMonitor *, GFileMonitorSource *);
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static void _kqsub_free (kqueue_sub *);
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static gboolean _kqsub_cancel (kqueue_sub *);
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#ifndef O_EVTONLY
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static void
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_fallback_callback (GFileMonitor *unused,
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GFile *first,
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GFile *second,
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GFileMonitorEvent event,
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gpointer udata)
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{
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GKqueueFileMonitor *kq_mon = G_KQUEUE_FILE_MONITOR (udata);
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g_file_monitor_emit_event (G_FILE_MONITOR (kq_mon), first, second, event);
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}
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/*
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* _ke_is_excluded:
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* @full_path - a path to file to check.
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*
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* Returns: TRUE if the file should be excluded from the kqueue-powered
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* monitoring, FALSE otherwise.
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**/
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gboolean
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_ke_is_excluded (const char *full_path)
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{
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GFile *f = NULL;
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GMount *mount = NULL;
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f = g_file_new_for_path (full_path);
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if (f != NULL) {
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mount = g_file_find_enclosing_mount (f, NULL, NULL);
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g_object_unref (f);
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}
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if ((mount != NULL && (g_mount_can_unmount (mount))) || g_str_has_prefix (full_path, "/mnt/"))
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{
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g_warning ("Excluding %s from kernel notification, falling back to poll", full_path);
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if (mount)
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g_object_unref (mount);
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return TRUE;
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}
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return FALSE;
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}
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#endif /* !O_EVTONLY */
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static void
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g_kqueue_file_monitor_finalize (GObject *object)
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{
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GKqueueFileMonitor *kqueue_monitor = G_KQUEUE_FILE_MONITOR (object);
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if (kqueue_monitor->sub)
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{
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_kqsub_cancel (kqueue_monitor->sub);
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_kqsub_free (kqueue_monitor->sub);
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kqueue_monitor->sub = NULL;
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}
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#ifndef O_EVTONLY
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if (kqueue_monitor->fallback)
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g_object_unref (kqueue_monitor->fallback);
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if (kqueue_monitor->fbfile)
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g_object_unref (kqueue_monitor->fbfile);
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#endif
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if (G_OBJECT_CLASS (g_kqueue_file_monitor_parent_class)->finalize)
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(*G_OBJECT_CLASS (g_kqueue_file_monitor_parent_class)->finalize) (object);
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}
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static void
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g_kqueue_file_monitor_start (GLocalFileMonitor *local_monitor,
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const gchar *dirname,
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const gchar *basename,
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const gchar *filename,
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GFileMonitorSource *source)
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{
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GKqueueFileMonitor *kqueue_monitor = G_KQUEUE_FILE_MONITOR (local_monitor);
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kqueue_sub *sub;
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const gchar *path;
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path = filename;
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if (path == NULL)
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path = dirname;
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#ifndef O_EVTONLY
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if (_ke_is_excluded (path))
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{
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GFile *file = g_file_new_for_path (path);
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kqueue_monitor->fbfile = file;
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kqueue_monitor->fallback = _g_poll_file_monitor_new (file);
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g_signal_connect (kqueue_monitor->fallback, "changed",
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G_CALLBACK (_fallback_callback), kqueue_monitor);
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return;
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}
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#endif
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/* For a directory monitor, create a subscription object anyway.
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* It will be used for directory diff calculation routines.
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* Wait, directory diff in a GKqueueFileMonitor?
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* Yes, it is. When a file monitor is started on an non-existent
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* file, GIO uses a GKqueueFileMonitor object for that. If a directory
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* will be created under that path, GKqueueFileMonitor will have to
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* handle the directory notifications. */
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sub = _kqsub_new (path, local_monitor, source);
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if (sub == NULL)
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return;
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kqueue_monitor->sub = sub;
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if (!_kqsub_start_watching (sub))
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_km_add_missing (sub);
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}
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static void
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g_kqueue_file_monitor_class_init (GKqueueFileMonitorClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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GFileMonitorClass *file_monitor_class = G_FILE_MONITOR_CLASS (klass);
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GLocalFileMonitorClass *local_file_monitor_class = G_LOCAL_FILE_MONITOR_CLASS (klass);
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gobject_class->finalize = g_kqueue_file_monitor_finalize;
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file_monitor_class->cancel = g_kqueue_file_monitor_cancel;
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local_file_monitor_class->is_supported = g_kqueue_file_monitor_is_supported;
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local_file_monitor_class->start = g_kqueue_file_monitor_start;
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local_file_monitor_class->mount_notify = TRUE; /* TODO: ??? */
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}
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static void
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g_kqueue_file_monitor_init (GKqueueFileMonitor *monitor)
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{
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}
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static gboolean
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g_kqueue_file_monitor_callback (gint fd, GIOCondition condition, gpointer user_data)
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{
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gint64 now = g_source_get_time (kq_source);
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kqueue_sub *sub;
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GFileMonitorSource *source;
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struct kevent ev;
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struct timespec ts;
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memset (&ts, 0, sizeof(ts));
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while (kevent(fd, NULL, 0, &ev, 1, &ts) > 0)
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{
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GFileMonitorEvent mask = 0;
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if (ev.filter != EVFILT_VNODE || ev.udata == NULL)
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continue;
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sub = ev.udata;
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source = sub->source;
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if (ev.flags & EV_ERROR)
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ev.fflags = NOTE_REVOKE;
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if (ev.fflags & (NOTE_DELETE | NOTE_REVOKE))
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{
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_kqsub_cancel (sub);
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_km_add_missing (sub);
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}
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if (sub->is_dir && ev.fflags & (NOTE_WRITE | NOTE_EXTEND))
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{
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_kh_dir_diff (sub);
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ev.fflags &= ~(NOTE_WRITE | NOTE_EXTEND);
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}
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if (ev.fflags & NOTE_DELETE)
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{
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mask = G_FILE_MONITOR_EVENT_DELETED;
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}
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else if (ev.fflags & NOTE_ATTRIB)
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{
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mask = G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED;
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}
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else if (ev.fflags & (NOTE_WRITE | NOTE_EXTEND))
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{
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mask = G_FILE_MONITOR_EVENT_CHANGED;
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}
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else if (ev.fflags & NOTE_RENAME)
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{
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/* Since there’s apparently no way to get the new name of the
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* file out of kqueue(), all we can do is say that this one has
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* been deleted. */
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mask = G_FILE_MONITOR_EVENT_DELETED;
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}
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else if (ev.fflags & NOTE_REVOKE)
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{
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mask = G_FILE_MONITOR_EVENT_UNMOUNTED;
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}
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if (mask)
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g_file_monitor_source_handle_event (source, mask, NULL, NULL, NULL, now);
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}
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return TRUE;
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}
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static gboolean
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g_kqueue_file_monitor_is_supported (void)
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{
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int errsv;
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G_LOCK (kq_lock);
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if (kq_queue == -1)
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{
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kq_queue = kqueue ();
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errsv = errno;
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if (kq_queue == -1)
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{
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g_warning ("Unable to create a kqueue: %s", g_strerror (errsv));
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G_UNLOCK (kq_lock);
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return FALSE;
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}
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kq_source = g_unix_fd_source_new (kq_queue, G_IO_IN);
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g_source_set_callback (kq_source, (GSourceFunc) g_kqueue_file_monitor_callback, NULL, NULL);
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g_source_attach (kq_source, GLIB_PRIVATE_CALL (g_get_worker_context) ());
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}
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G_UNLOCK (kq_lock);
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return TRUE;
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}
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static gboolean
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g_kqueue_file_monitor_cancel (GFileMonitor *monitor)
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{
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GKqueueFileMonitor *kqueue_monitor = G_KQUEUE_FILE_MONITOR (monitor);
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if (kqueue_monitor->sub)
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{
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_kqsub_cancel (kqueue_monitor->sub);
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_kqsub_free (kqueue_monitor->sub);
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kqueue_monitor->sub = NULL;
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}
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#ifndef O_EVTONLY
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else if (kqueue_monitor->fallback)
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{
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g_signal_handlers_disconnect_by_func (kqueue_monitor->fallback, _fallback_callback, kqueue_monitor);
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g_file_monitor_cancel (kqueue_monitor->fallback);
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}
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#endif
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if (G_FILE_MONITOR_CLASS (g_kqueue_file_monitor_parent_class)->cancel)
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(*G_FILE_MONITOR_CLASS (g_kqueue_file_monitor_parent_class)->cancel) (monitor);
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return TRUE;
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}
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static kqueue_sub *
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_kqsub_new (const gchar *filename, GLocalFileMonitor *mon, GFileMonitorSource *source)
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{
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kqueue_sub *sub;
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sub = g_slice_new (kqueue_sub);
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sub->filename = g_strdup (filename);
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sub->mon = mon;
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g_source_ref ((GSource *) source);
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sub->source = source;
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sub->fd = -1;
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sub->deps = NULL;
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sub->is_dir = 0;
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return sub;
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}
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static void
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_kqsub_free (kqueue_sub *sub)
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{
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g_assert (sub->deps == NULL);
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g_assert (sub->fd == -1);
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g_source_unref ((GSource *) sub->source);
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g_free (sub->filename);
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g_slice_free (kqueue_sub, sub);
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}
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static gboolean
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_kqsub_cancel (kqueue_sub *sub)
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{
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struct kevent ev;
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/* Remove the event and close the file descriptor to automatically
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* delete pending events. */
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if (sub->fd != -1)
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{
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EV_SET (&ev, sub->fd, EVFILT_VNODE, EV_DELETE, NOTE_ALL, 0, sub);
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if (kevent (kq_queue, &ev, 1, NULL, 0, NULL) == -1)
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{
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g_warning ("Unable to remove event for %s: %s", sub->filename, g_strerror (errno));
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return FALSE;
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}
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close (sub->fd);
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sub->fd = -1;
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}
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_km_remove (sub);
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if (sub->deps)
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{
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dl_free (sub->deps);
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sub->deps = NULL;
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}
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return TRUE;
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}
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gboolean
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_kqsub_start_watching (kqueue_sub *sub)
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{
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struct stat st;
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struct kevent ev;
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sub->fd = open (sub->filename, O_KQFLAG);
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if (sub->fd == -1)
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return FALSE;
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if (fstat (sub->fd, &st) == -1)
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{
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g_warning ("fstat failed for %s: %s", sub->filename, g_strerror (errno));
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close (sub->fd);
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sub->fd = -1;
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return FALSE;
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}
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sub->is_dir = (st.st_mode & S_IFDIR) ? 1 : 0;
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if (sub->is_dir)
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{
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if (sub->deps)
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dl_free (sub->deps);
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sub->deps = dl_listing (sub->filename);
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}
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EV_SET (&ev, sub->fd, EVFILT_VNODE, EV_ADD | EV_CLEAR, NOTE_ALL, 0, sub);
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if (kevent (kq_queue, &ev, 1, NULL, 0, NULL) == -1)
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{
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g_warning ("Unable to add event for %s: %s", sub->filename, g_strerror (errno));
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close (sub->fd);
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sub->fd = -1;
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return FALSE;
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}
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return TRUE;
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}
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