| /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */ |
| |
| /* inotify-helper.c - GVFS Monitor based on inotify. |
| |
| Copyright (C) 2007 John McCutchan |
| |
| The Gnome Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public License as |
| published by the Free Software Foundation; either version 2 of the |
| License, or (at your option) any later version. |
| |
| The Gnome Library 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 |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with the Gnome Library; see the file COPYING.LIB. If not, |
| write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, |
| Boston, MA 02111-1307, USA. |
| |
| Authors: |
| John McCutchan <john@johnmccutchan.com> |
| */ |
| |
| #include "config.h" |
| #include <errno.h> |
| #include <time.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| /* Just include the local header to stop all the pain */ |
| #include <sys/inotify.h> |
| #include <gio/glocalfile.h> |
| #include <gio/gfilemonitor.h> |
| #include <gio/gfile.h> |
| #include "inotify-helper.h" |
| #include "inotify-missing.h" |
| #include "inotify-path.h" |
| #include "inotify-diag.h" |
| |
| #include "gioalias.h" |
| |
| |
| static gboolean ih_debug_enabled = FALSE; |
| #define IH_W if (ih_debug_enabled) g_warning |
| |
| static void ih_event_callback (ik_event_t *event, inotify_sub *sub); |
| static void ih_not_missing_callback (inotify_sub *sub); |
| |
| /* We share this lock with inotify-kernel.c and inotify-missing.c |
| * |
| * inotify-kernel.c takes the lock when it reads events from |
| * the kernel and when it processes those events |
| * |
| * inotify-missing.c takes the lock when it is scanning the missing |
| * list. |
| * |
| * We take the lock in all public functions |
| */ |
| G_GNUC_INTERNAL G_LOCK_DEFINE (inotify_lock); |
| |
| static GFileMonitorEvent ih_mask_to_EventFlags (guint32 mask); |
| |
| /** |
| * _ih_startup: |
| * |
| * Initializes the inotify backend. This must be called before |
| * any other functions in this module. |
| * |
| * Return value: #TRUE if initialization succeeded, #FALSE otherwise |
| */ |
| gboolean |
| _ih_startup (void) |
| { |
| static gboolean initialized = FALSE; |
| static gboolean result = FALSE; |
| |
| G_LOCK (inotify_lock); |
| |
| if (initialized == TRUE) |
| { |
| G_UNLOCK (inotify_lock); |
| return result; |
| } |
| |
| result = _ip_startup (ih_event_callback); |
| if (!result) |
| { |
| g_warning ("Could not initialize inotify\n"); |
| G_UNLOCK (inotify_lock); |
| return FALSE; |
| } |
| _im_startup (ih_not_missing_callback); |
| _id_startup (); |
| |
| IH_W ("started gvfs inotify backend\n"); |
| |
| initialized = TRUE; |
| |
| G_UNLOCK (inotify_lock); |
| |
| return TRUE; |
| } |
| |
| /* |
| * Adds a subscription to be monitored. |
| */ |
| gboolean |
| _ih_sub_add (inotify_sub *sub) |
| { |
| G_LOCK (inotify_lock); |
| |
| if (!_ip_start_watching (sub)) |
| _im_add (sub); |
| |
| G_UNLOCK (inotify_lock); |
| return TRUE; |
| } |
| |
| /* |
| * Cancels a subscription which was being monitored. |
| */ |
| gboolean |
| _ih_sub_cancel (inotify_sub *sub) |
| { |
| G_LOCK (inotify_lock); |
| |
| if (!sub->cancelled) |
| { |
| IH_W ("cancelling %s\n", sub->dirname); |
| sub->cancelled = TRUE; |
| _im_rm (sub); |
| _ip_stop_watching (sub); |
| } |
| |
| G_UNLOCK (inotify_lock); |
| |
| return TRUE; |
| } |
| |
| static char * |
| _ih_fullpath_from_event (ik_event_t *event, char *dirname) |
| { |
| char *fullpath; |
| |
| if (event->name) |
| fullpath = g_strdup_printf ("%s/%s", dirname, event->name); |
| else |
| fullpath = g_strdup_printf ("%s/", dirname); |
| |
| return fullpath; |
| } |
| |
| |
| static gboolean |
| ih_event_is_paired_move (ik_event_t *event) |
| { |
| if (event->pair) |
| { |
| ik_event_t *paired = event->pair; |
| /* intofiy(7): IN_MOVE == IN_MOVED_FROM | IN_MOVED_TO */ |
| return (event->mask | paired->mask) & IN_MOVE; |
| } |
| |
| return FALSE; |
| } |
| |
| static void |
| ih_event_callback (ik_event_t *event, |
| inotify_sub *sub) |
| { |
| gchar *fullpath; |
| GFileMonitorEvent eflags; |
| GFile* parent; |
| GFile* child; |
| GFile* other; |
| |
| eflags = ih_mask_to_EventFlags (event->mask); |
| parent = g_file_new_for_path (sub->dirname); |
| fullpath = _ih_fullpath_from_event (event, sub->dirname); |
| child = g_file_new_for_path (fullpath); |
| g_free (fullpath); |
| |
| if (ih_event_is_paired_move (event) && sub->pair_moves) |
| { |
| char *parent_dir = _ip_get_path_for_wd (event->pair->wd); |
| fullpath = _ih_fullpath_from_event (event->pair, parent_dir); |
| other = g_file_new_for_path (fullpath); |
| g_free (fullpath); |
| eflags = G_FILE_MONITOR_EVENT_MOVED; |
| event->pair = NULL; /* prevents the paired event to be emitted as well */ |
| } |
| else |
| other = NULL; |
| |
| g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data), |
| child, other, eflags); |
| |
| g_object_unref (child); |
| g_object_unref (parent); |
| if (other) |
| g_object_unref (other); |
| } |
| |
| static void |
| ih_not_missing_callback (inotify_sub *sub) |
| { |
| gchar *fullpath; |
| GFileMonitorEvent eflags; |
| guint32 mask; |
| GFile* parent; |
| GFile* child; |
| |
| parent = g_file_new_for_path (sub->dirname); |
| |
| if (sub->filename) |
| { |
| fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename); |
| g_warning ("Missing callback called fullpath = %s\n", fullpath); |
| if (!g_file_test (fullpath, G_FILE_TEST_EXISTS)) |
| { |
| g_free (fullpath); |
| return; |
| } |
| mask = IN_CREATE; |
| } |
| else |
| { |
| fullpath = g_strdup_printf ("%s", sub->dirname); |
| mask = IN_CREATE|IN_ISDIR; |
| } |
| |
| eflags = ih_mask_to_EventFlags (mask); |
| child = g_file_new_for_path (fullpath); |
| g_free (fullpath); |
| |
| g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data), |
| child, NULL, eflags); |
| |
| g_object_unref (child); |
| g_object_unref (parent); |
| } |
| |
| /* Transforms a inotify event to a GVFS event. */ |
| static GFileMonitorEvent |
| ih_mask_to_EventFlags (guint32 mask) |
| { |
| mask &= ~IN_ISDIR; |
| switch (mask) |
| { |
| case IN_MODIFY: |
| return G_FILE_MONITOR_EVENT_CHANGED; |
| case IN_CLOSE_WRITE: |
| return G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT; |
| case IN_ATTRIB: |
| return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED; |
| case IN_MOVE_SELF: |
| case IN_MOVED_FROM: |
| case IN_DELETE: |
| case IN_DELETE_SELF: |
| return G_FILE_MONITOR_EVENT_DELETED; |
| case IN_CREATE: |
| case IN_MOVED_TO: |
| return G_FILE_MONITOR_EVENT_CREATED; |
| case IN_UNMOUNT: |
| return G_FILE_MONITOR_EVENT_UNMOUNTED; |
| case IN_Q_OVERFLOW: |
| case IN_OPEN: |
| case IN_CLOSE_NOWRITE: |
| case IN_ACCESS: |
| case IN_IGNORED: |
| default: |
| return -1; |
| } |
| } |