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https://gitlab.gnome.org/GNOME/glib.git
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612c450bd4
Fixes build on old compilers that don't allow type redefinitions. Closes: https://gitlab.gnome.org/GNOME/glib/issues/1506
621 lines
20 KiB
C
621 lines
20 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 <glib/gfileutils.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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/* C11 allows type redefinition, but GLib is configured to use C89, which causes
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* clang to show warnings when we use a C11 feature. Since the C89 requirement
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* is mostly used to support MSVC, we simply ignore the warning here because
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* this file is never going to be useful on Windows. */
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#ifdef __clang__
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#pragma clang diagnostic push
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#pragma clang diagnostic ignored "-Wtypedef-redefinition"
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#endif
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typedef GLocalFileMonitorClass GKqueueFileMonitorClass;
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/* When the file we are monitoring is a directory, sub_dir is subscribed to the
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* directory itself and sub_file is NULL.
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*
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* When the file we are monitoring is a regular file, sub_dir is subscribed to
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* the directory containing the file and sub_file is subscribed to the file
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* being monitored. We have to monitor both because it is possible that the
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* file chosen for monitoring doesn't exist when the file monitor is started.
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* We monitor on its parent in order to get notification when it is created.
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*
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* To distinguish between a directory monitor and a regular file monitor, check
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* whether sub_file is NULL. */
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struct _GKqueueFileMonitor
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{
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GLocalFileMonitor parent_instance;
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kqueue_sub *sub_dir;
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kqueue_sub *sub_file;
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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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};
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#ifdef __clang__
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#pragma clang diagnostic pop
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#endif
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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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static inline unsigned int
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note_all (void)
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{
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unsigned int notes = NOTE_DELETE | NOTE_WRITE | NOTE_EXTEND | NOTE_ATTRIB | NOTE_RENAME;
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#ifdef NOTE_TRUNCATE
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notes |= NOTE_TRUNCATE;
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#endif
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#ifdef NOTE_CLOSE_WRITE
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notes |= NOTE_CLOSE_WRITE;
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#endif
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return notes;
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}
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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 (gchar *, gchar *, GKqueueFileMonitor *, 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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static 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_str_has_prefix (full_path, "/media/") || g_str_has_prefix (full_path, "/run/media/")))
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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_dir)
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{
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_kqsub_cancel (kqueue_monitor->sub_dir);
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_kqsub_free (kqueue_monitor->sub_dir);
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kqueue_monitor->sub_dir = NULL;
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}
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if (kqueue_monitor->sub_file)
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{
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_kqsub_cancel (kqueue_monitor->sub_file);
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_kqsub_free (kqueue_monitor->sub_file);
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kqueue_monitor->sub_file = 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_dir = NULL, *sub_file = NULL;
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gchar *path_dir, *path_file, *file_basename;
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/* There are three possible cases here:
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*
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* 1. Directory: dirname != NULL, basename == NULL, filename == NULL
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* 2. Regular file: dirname != NULL, basename != NULL, filename == NULL
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* 3. Hard links: dirname == NULL, basename == NULL, filename != NULL
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*
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* Note that we don't distinguish between case 2 and 3. Kqueue monitors
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* files based on file descriptors, so we always receive events come from
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* hard links.
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*/
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if (filename != NULL)
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{
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path_dir = g_path_get_dirname (filename);
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path_file = g_strdup (filename);
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file_basename = g_path_get_basename (filename);
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}
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else
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{
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path_dir = g_strdup (dirname);
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if (basename != NULL)
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{
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path_file = g_build_filename (dirname, basename, NULL);
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file_basename = g_strdup (basename);
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}
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else
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{
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path_file = NULL;
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file_basename = NULL;
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}
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}
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#ifndef O_EVTONLY
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if (_ke_is_excluded (path_dir))
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{
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GFile *file;
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if (path_file != NULL)
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file = g_file_new_for_path (path_file);
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else
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file = g_file_new_for_path (path_dir);
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g_free (path_dir);
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g_free (path_file);
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g_free (file_basename);
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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_dir = _kqsub_new (g_steal_pointer (&path_dir), NULL,
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kqueue_monitor, source);
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if (!_kqsub_start_watching (sub_dir))
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_km_add_missing (sub_dir);
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/* Unlike GInotifyFileMonitor, which always uses a directory monitor
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* regardless of the type of the file being monitored, kqueue doesn't
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* give us events generated by files under it when we are monitoring
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* a directory. We have to monitor the file itself to know changes which
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* was made to the file itself. */
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if (path_file != NULL)
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{
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sub_file = _kqsub_new (g_steal_pointer (&path_file),
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g_steal_pointer (&file_basename),
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kqueue_monitor, source);
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if (!_kqsub_start_watching (sub_file))
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_km_add_missing (sub_file);
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}
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kqueue_monitor->sub_dir = sub_dir;
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kqueue_monitor->sub_file = sub_file;
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g_clear_pointer (&path_dir, g_free);
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g_clear_pointer (&path_file, g_free);
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g_clear_pointer (&file_basename, g_free);
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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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/* We must hold the global lock before accessing any kqueue_sub because it is
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* possible for other threads to call g_kqueue_file_monitor_cancel, which may
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* free the kqueue_sub struct we are accessing. */
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G_LOCK (kq_lock);
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while (kevent(fd, NULL, 0, &ev, 1, &ts) > 0)
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{
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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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/* When we are monitoring a regular file which already exists, ignore
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* events generated by its parent directory. This has to be the first
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* check to prevent the following code to emit useless events */
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if (sub->is_dir && sub->mon->sub_file != NULL && sub->mon->sub_file->fd != -1)
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continue;
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if (ev.flags & EV_ERROR)
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ev.fflags = NOTE_REVOKE;
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if (sub->is_dir && ev.fflags & (NOTE_WRITE | NOTE_EXTEND))
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{
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/* If we are monitoring on a non-existent regular file, trigger the
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* rescan of missing files immediately so we don't have to wait for
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* 4 seconds for discovering missing files. We pass the sub_file
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* corresponding to the GKqueueFileMonitor to 'check_this_sub_only'
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* argument to prevent _km_scan_missing from emiting 'CREATED'
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* events because _kh_dir_diff will do it for us. */
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if (sub->mon->sub_file != NULL && sub->mon->sub_file->fd == -1)
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_km_scan_missing (sub->mon->sub_file);
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/* If we are monitoring a regular file, don't emit 'DELETED' events
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* from the directory monitor because it will be emitted from the
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* file itself when a NOTE_DELETE is reported on sub_file. */
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_kh_dir_diff (sub, sub->mon->sub_file == NULL);
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#ifdef NOTE_TRUNCATE
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ev.fflags &= ~(NOTE_WRITE | NOTE_EXTEND | NOTE_TRUNCATE);
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#else
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ev.fflags &= ~(NOTE_WRITE | NOTE_EXTEND);
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#endif
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}
|
||
|
||
/* Here starts the long section of mapping kqueue events to
|
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* GFileMonitorEvent. Since kqueue can return multiple events in a
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* single kevent struct, we must use 'if' instead of 'else if'. */
|
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if (ev.fflags & NOTE_DELETE)
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{
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struct stat st;
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if (fstat (sub->fd, &st) < 0)
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st.st_nlink = 0;
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||
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g_file_monitor_source_handle_event (source,
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G_FILE_MONITOR_EVENT_DELETED,
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sub->basename, NULL, NULL, now);
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|
||
/* If the last reference to the file was removed, delete the
|
||
* subscription from kqueue and add it to the missing list.
|
||
* If you are monitoring a file which has hard link count higher
|
||
* than 1, it is possible for the same file to emit 'DELETED'
|
||
* events multiple times. */
|
||
if (st.st_nlink == 0)
|
||
{
|
||
_kqsub_cancel (sub);
|
||
_km_add_missing (sub);
|
||
}
|
||
}
|
||
if (ev.fflags & NOTE_REVOKE)
|
||
{
|
||
g_file_monitor_source_handle_event (source,
|
||
G_FILE_MONITOR_EVENT_UNMOUNTED,
|
||
sub->basename, NULL, NULL, now);
|
||
_kqsub_cancel (sub);
|
||
_km_add_missing (sub);
|
||
}
|
||
if (ev.fflags & NOTE_ATTRIB)
|
||
{
|
||
g_file_monitor_source_handle_event (source,
|
||
G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED,
|
||
sub->basename, NULL, NULL, now);
|
||
}
|
||
#ifdef NOTE_TRUNCATE
|
||
if (ev.fflags & (NOTE_WRITE | NOTE_EXTEND | NOTE_TRUNCATE))
|
||
#else
|
||
if (ev.fflags & (NOTE_WRITE | NOTE_EXTEND))
|
||
#endif
|
||
{
|
||
g_file_monitor_source_handle_event (source,
|
||
G_FILE_MONITOR_EVENT_CHANGED,
|
||
sub->basename, NULL, NULL, now);
|
||
}
|
||
if (ev.fflags & NOTE_RENAME)
|
||
{
|
||
/* Since there’s apparently no way to get the new name of the
|
||
* file out of kqueue(), all we can do is say that this one has
|
||
* been deleted. */
|
||
g_file_monitor_source_handle_event (source,
|
||
G_FILE_MONITOR_EVENT_DELETED,
|
||
sub->basename, NULL, NULL, now);
|
||
}
|
||
#ifdef NOTE_CLOSE_WRITE
|
||
if (ev.fflags & NOTE_CLOSE_WRITE)
|
||
{
|
||
g_file_monitor_source_handle_event (source,
|
||
G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT,
|
||
sub->basename, NULL, NULL, now);
|
||
}
|
||
#endif
|
||
|
||
/* Handle the case when a file is created again shortly after it was
|
||
* deleted. It has to be the last check because 'DELETED' must happen
|
||
* before 'CREATED'. */
|
||
if (ev.fflags & (NOTE_DELETE | NOTE_REVOKE))
|
||
_km_scan_missing (NULL);
|
||
}
|
||
|
||
G_UNLOCK (kq_lock);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
g_kqueue_file_monitor_is_supported (void)
|
||
{
|
||
int errsv;
|
||
|
||
G_LOCK (kq_lock);
|
||
|
||
if (kq_queue == -1)
|
||
{
|
||
kq_queue = kqueue ();
|
||
errsv = errno;
|
||
|
||
if (kq_queue == -1)
|
||
{
|
||
g_warning ("Unable to create a kqueue: %s", g_strerror (errsv));
|
||
G_UNLOCK (kq_lock);
|
||
return FALSE;
|
||
}
|
||
|
||
kq_source = g_unix_fd_source_new (kq_queue, G_IO_IN);
|
||
g_source_set_callback (kq_source, (GSourceFunc) g_kqueue_file_monitor_callback, NULL, NULL);
|
||
g_source_attach (kq_source, GLIB_PRIVATE_CALL (g_get_worker_context) ());
|
||
}
|
||
|
||
G_UNLOCK (kq_lock);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static gboolean
|
||
g_kqueue_file_monitor_cancel (GFileMonitor *monitor)
|
||
{
|
||
GKqueueFileMonitor *kqueue_monitor = G_KQUEUE_FILE_MONITOR (monitor);
|
||
|
||
/* We must hold the global lock before calling _kqsub_cancel. However, we
|
||
* cannot call G_LOCK in _kqsub_cancel because it is also used by
|
||
* g_kqueue_file_monitor_callback, which already holds the lock itself. */
|
||
G_LOCK (kq_lock);
|
||
|
||
if (kqueue_monitor->sub_dir)
|
||
{
|
||
_kqsub_cancel (kqueue_monitor->sub_dir);
|
||
_kqsub_free (kqueue_monitor->sub_dir);
|
||
kqueue_monitor->sub_dir = NULL;
|
||
}
|
||
if (kqueue_monitor->sub_file)
|
||
{
|
||
_kqsub_cancel (kqueue_monitor->sub_file);
|
||
_kqsub_free (kqueue_monitor->sub_file);
|
||
kqueue_monitor->sub_file = NULL;
|
||
}
|
||
|
||
G_UNLOCK (kq_lock);
|
||
|
||
#ifndef O_EVTONLY
|
||
if (kqueue_monitor->fallback)
|
||
{
|
||
g_signal_handlers_disconnect_by_func (kqueue_monitor->fallback, _fallback_callback, kqueue_monitor);
|
||
g_file_monitor_cancel (kqueue_monitor->fallback);
|
||
}
|
||
#endif
|
||
|
||
if (G_FILE_MONITOR_CLASS (g_kqueue_file_monitor_parent_class)->cancel)
|
||
(*G_FILE_MONITOR_CLASS (g_kqueue_file_monitor_parent_class)->cancel) (monitor);
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
static kqueue_sub *
|
||
_kqsub_new (gchar *filename, gchar *basename, GKqueueFileMonitor *mon, GFileMonitorSource *source)
|
||
{
|
||
kqueue_sub *sub;
|
||
|
||
sub = g_slice_new (kqueue_sub);
|
||
sub->filename = filename;
|
||
sub->basename = basename;
|
||
sub->mon = mon;
|
||
g_source_ref ((GSource *) source);
|
||
sub->source = source;
|
||
sub->fd = -1;
|
||
sub->deps = NULL;
|
||
sub->is_dir = 0;
|
||
|
||
return sub;
|
||
}
|
||
|
||
static void
|
||
_kqsub_free (kqueue_sub *sub)
|
||
{
|
||
g_assert (sub->deps == NULL);
|
||
g_assert (sub->fd == -1);
|
||
|
||
g_source_unref ((GSource *) sub->source);
|
||
g_free (sub->filename);
|
||
g_free (sub->basename);
|
||
g_slice_free (kqueue_sub, sub);
|
||
}
|
||
|
||
static gboolean
|
||
_kqsub_cancel (kqueue_sub *sub)
|
||
{
|
||
/* WARNING: Before calling this function, you must hold a lock on kq_lock
|
||
* or you will cause use-after-free in g_kqueue_file_monitor_callback. */
|
||
|
||
struct kevent ev;
|
||
|
||
/* Remove the event and close the file descriptor to automatically
|
||
* delete pending events. */
|
||
if (sub->fd != -1)
|
||
{
|
||
EV_SET (&ev, sub->fd, EVFILT_VNODE, EV_DELETE, note_all (), 0, sub);
|
||
if (kevent (kq_queue, &ev, 1, NULL, 0, NULL) == -1)
|
||
{
|
||
g_warning ("Unable to remove event for %s: %s", sub->filename, g_strerror (errno));
|
||
return FALSE;
|
||
}
|
||
close (sub->fd);
|
||
sub->fd = -1;
|
||
}
|
||
|
||
_km_remove (sub);
|
||
|
||
if (sub->deps)
|
||
{
|
||
dl_free (sub->deps);
|
||
sub->deps = NULL;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
gboolean
|
||
_kqsub_start_watching (kqueue_sub *sub)
|
||
{
|
||
struct stat st;
|
||
struct kevent ev;
|
||
|
||
sub->fd = open (sub->filename, O_KQFLAG);
|
||
if (sub->fd == -1)
|
||
return FALSE;
|
||
|
||
if (fstat (sub->fd, &st) == -1)
|
||
{
|
||
g_warning ("fstat failed for %s: %s", sub->filename, g_strerror (errno));
|
||
close (sub->fd);
|
||
sub->fd = -1;
|
||
return FALSE;
|
||
}
|
||
|
||
sub->is_dir = (st.st_mode & S_IFDIR) ? 1 : 0;
|
||
if (sub->is_dir)
|
||
{
|
||
if (sub->deps)
|
||
dl_free (sub->deps);
|
||
|
||
sub->deps = dl_listing (sub->filename);
|
||
}
|
||
|
||
EV_SET (&ev, sub->fd, EVFILT_VNODE, EV_ADD | EV_CLEAR, note_all (), 0, sub);
|
||
if (kevent (kq_queue, &ev, 1, NULL, 0, NULL) == -1)
|
||
{
|
||
g_warning ("Unable to add event for %s: %s", sub->filename, g_strerror (errno));
|
||
close (sub->fd);
|
||
sub->fd = -1;
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|