1 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 2; tab-width: 8 -*- */ 2 3 /* inotify-helper.c - GVFS Monitor based on inotify. 4 5 Copyright (C) 2007 John McCutchan 6 7 The Gnome Library is free software; you can redistribute it and/or 8 modify it under the terms of the GNU Library General Public License as 9 published by the Free Software Foundation; either version 2 of the 10 License, or (at your option) any later version. 11 12 The Gnome Library is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 Library General Public License for more details. 16 17 You should have received a copy of the GNU Library General Public 18 License along with the Gnome Library; see the file COPYING.LIB. If not, 19 write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, 20 Boston, MA 02111-1307, USA. 21 22 Authors: 23 John McCutchan <john (at) johnmccutchan.com> 24 */ 25 26 #include "config.h" 27 #include <errno.h> 28 #include <time.h> 29 #include <string.h> 30 #include <sys/ioctl.h> 31 /* Just include the local header to stop all the pain */ 32 #include <sys/inotify.h> 33 #include <gio/glocalfile.h> 34 #include <gio/gfilemonitor.h> 35 #include <gio/gfile.h> 36 #include "inotify-helper.h" 37 #include "inotify-missing.h" 38 #include "inotify-path.h" 39 #include "inotify-diag.h" 40 41 #include "gioalias.h" 42 43 44 static gboolean ih_debug_enabled = FALSE; 45 #define IH_W if (ih_debug_enabled) g_warning 46 47 static void ih_event_callback (ik_event_t *event, inotify_sub *sub); 48 static void ih_not_missing_callback (inotify_sub *sub); 49 50 /* We share this lock with inotify-kernel.c and inotify-missing.c 51 * 52 * inotify-kernel.c takes the lock when it reads events from 53 * the kernel and when it processes those events 54 * 55 * inotify-missing.c takes the lock when it is scanning the missing 56 * list. 57 * 58 * We take the lock in all public functions 59 */ 60 G_GNUC_INTERNAL G_LOCK_DEFINE (inotify_lock); 61 62 static GFileMonitorEvent ih_mask_to_EventFlags (guint32 mask); 63 64 /** 65 * _ih_startup: 66 * 67 * Initializes the inotify backend. This must be called before 68 * any other functions in this module. 69 * 70 * Return value: #TRUE if initialization succeeded, #FALSE otherwise 71 */ 72 gboolean 73 _ih_startup (void) 74 { 75 static gboolean initialized = FALSE; 76 static gboolean result = FALSE; 77 78 G_LOCK (inotify_lock); 79 80 if (initialized == TRUE) 81 { 82 G_UNLOCK (inotify_lock); 83 return result; 84 } 85 86 result = _ip_startup (ih_event_callback); 87 if (!result) 88 { 89 g_warning ("Could not initialize inotify\n"); 90 G_UNLOCK (inotify_lock); 91 return FALSE; 92 } 93 _im_startup (ih_not_missing_callback); 94 _id_startup (); 95 96 IH_W ("started gvfs inotify backend\n"); 97 98 initialized = TRUE; 99 100 G_UNLOCK (inotify_lock); 101 102 return TRUE; 103 } 104 105 /** 106 * Adds a subscription to be monitored. 107 */ 108 gboolean 109 _ih_sub_add (inotify_sub *sub) 110 { 111 G_LOCK (inotify_lock); 112 113 if (!_ip_start_watching (sub)) 114 _im_add (sub); 115 116 G_UNLOCK (inotify_lock); 117 return TRUE; 118 } 119 120 /** 121 * Cancels a subscription which was being monitored. 122 */ 123 gboolean 124 _ih_sub_cancel (inotify_sub *sub) 125 { 126 G_LOCK (inotify_lock); 127 128 if (!sub->cancelled) 129 { 130 IH_W ("cancelling %s\n", sub->dirname); 131 sub->cancelled = TRUE; 132 _im_rm (sub); 133 _ip_stop_watching (sub); 134 } 135 136 G_UNLOCK (inotify_lock); 137 138 return TRUE; 139 } 140 141 142 static void 143 ih_event_callback (ik_event_t *event, 144 inotify_sub *sub) 145 { 146 gchar *fullpath; 147 GFileMonitorEvent eflags; 148 GFile* parent; 149 GFile* child; 150 151 eflags = ih_mask_to_EventFlags (event->mask); 152 parent = g_file_new_for_path (sub->dirname); 153 if (event->name) 154 fullpath = g_strdup_printf ("%s/%s", sub->dirname, event->name); 155 else 156 fullpath = g_strdup_printf ("%s/", sub->dirname); 157 158 child = g_file_new_for_path (fullpath); 159 g_free (fullpath); 160 161 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data), 162 child, NULL, eflags); 163 164 g_object_unref (child); 165 g_object_unref (parent); 166 } 167 168 static void 169 ih_not_missing_callback (inotify_sub *sub) 170 { 171 gchar *fullpath; 172 GFileMonitorEvent eflags; 173 guint32 mask; 174 GFile* parent; 175 GFile* child; 176 177 parent = g_file_new_for_path (sub->dirname); 178 179 if (sub->filename) 180 { 181 fullpath = g_strdup_printf ("%s/%s", sub->dirname, sub->filename); 182 g_warning ("Missing callback called fullpath = %s\n", fullpath); 183 if (!g_file_test (fullpath, G_FILE_TEST_EXISTS)) 184 { 185 g_free (fullpath); 186 return; 187 } 188 mask = IN_CREATE; 189 } 190 else 191 { 192 fullpath = g_strdup_printf ("%s", sub->dirname); 193 mask = IN_CREATE|IN_ISDIR; 194 } 195 196 eflags = ih_mask_to_EventFlags (mask); 197 child = g_file_new_for_path (fullpath); 198 g_free (fullpath); 199 200 g_file_monitor_emit_event (G_FILE_MONITOR (sub->user_data), 201 child, NULL, eflags); 202 203 g_object_unref (child); 204 g_object_unref (parent); 205 } 206 207 /* Transforms a inotify event to a GVFS event. */ 208 static GFileMonitorEvent 209 ih_mask_to_EventFlags (guint32 mask) 210 { 211 mask &= ~IN_ISDIR; 212 switch (mask) 213 { 214 case IN_MODIFY: 215 return G_FILE_MONITOR_EVENT_CHANGED; 216 case IN_CLOSE_WRITE: 217 return G_FILE_MONITOR_EVENT_CHANGES_DONE_HINT; 218 case IN_ATTRIB: 219 return G_FILE_MONITOR_EVENT_ATTRIBUTE_CHANGED; 220 case IN_MOVE_SELF: 221 case IN_MOVED_FROM: 222 case IN_DELETE: 223 case IN_DELETE_SELF: 224 return G_FILE_MONITOR_EVENT_DELETED; 225 case IN_CREATE: 226 case IN_MOVED_TO: 227 return G_FILE_MONITOR_EVENT_CREATED; 228 case IN_UNMOUNT: 229 return G_FILE_MONITOR_EVENT_UNMOUNTED; 230 case IN_Q_OVERFLOW: 231 case IN_OPEN: 232 case IN_CLOSE_NOWRITE: 233 case IN_ACCESS: 234 case IN_IGNORED: 235 default: 236 return -1; 237 } 238 } 239
