gio/gdrive.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Alexander Larsson <alexl@redhat.com>
  21  *         David Zeuthen <davidz@redhat.com>
  22  */
  23
  24 #include "config.h"
  25 #include "gdrive.h"
  26 #include "gsimpleasyncresult.h"
  27 #include "gasyncresult.h"
  28 #include "gioerror.h"
  29 #include "glibintl.h"
  30
  31 #include "gioalias.h"
  32
  33 /**
  34  * SECTION:gdrive
  35  * @short_description: Virtual File System drive management
  36  * @include: gio/gio.h
  37  *
  38  * #GDrive - this represent a piece of hardware connected to the machine.
  39  * Its generally only created for removable hardware or hardware with
  40  * removable media.
  41  *
  42  * #GDrive is a container class for #GVolume objects that stem from
  43  * the same piece of media. As such, #GDrive abstracts a drive with
  44  * (or without) removable media and provides operations for querying
  45  * whether media is available, determing whether media change is
  46  * automatically detected and ejecting the media.
  47  *
  48  * If the #GDrive reports that media isn't automatically detected, one
  49  * can poll for media; typically one should not do this periodically
  50  * as a poll for media operation is potententially expensive and may
  51  * spin up the drive creating noise.
  52  *
  53  * For porting from GnomeVFS note that there is no equivalent of
  54  * #GDrive in that API.
  55  **/
  56
  57 static void g_drive_base_init (gpointer g_class);
  58 static void g_drive_class_init (gpointer g_class,
  59                                  gpointer class_data);
  60
  61 GType
  62 g_drive_get_type (void)
  63 {
  64   static GType drive_type = 0;
  65
  66   if (! drive_type)
  67     {
  68       static const GTypeInfo drive_info =
  69       {
  70         sizeof (GDriveIface), /* class_size */
  71         g_drive_base_init,   /* base_init */
  72         NULL,           /* base_finalize */
  73         g_drive_class_init,
  74         NULL,           /* class_finalize */
  75         NULL,           /* class_data */
  76         0,
  77         0,              /* n_preallocs */
  78         NULL
  79       };
  80
  81       drive_type =
  82         g_type_register_static (G_TYPE_INTERFACE, I_("GDrive"),
  83                                 &drive_info, 0);
  84
  85       g_type_interface_add_prerequisite (drive_type, G_TYPE_OBJECT);
  86     }
  87
  88   return drive_type;
  89 }
  90
  91 static void
  92 g_drive_class_init (gpointer g_class,
  93                     gpointer class_data)
  94 {
  95 }
  96
  97 static void
  98 g_drive_base_init (gpointer g_class)
  99 {
 100   static gboolean initialized = FALSE;
 101
 102   if (! initialized)
 103     {
 104       /**
 105       * GDrive::changed:
 106       * @drive: a #GDrive.
 107       *
 108       * Emitted when the drive's state has changed.
 109       **/
 110       g_signal_new (I_("changed"),
 111                     G_TYPE_DRIVE,
 112                     G_SIGNAL_RUN_LAST,
 113                     G_STRUCT_OFFSET (GDriveIface, changed),
 114                     NULL, NULL,
 115                     g_cclosure_marshal_VOID__VOID,
 116                     G_TYPE_NONE, 0);
 117
 118       /**
 119       * GDrive::disconnected:
 120       * @drive: a #GDrive.
 121       *
 122       * This signal is emitted when the #GDrive have been
 123       * disconnected. If the recipient is holding references to the
 124       * object they should release them so the object can be
 125       * finalized.
 126       **/
 127       g_signal_new (I_("disconnected"),
 128                     G_TYPE_DRIVE,
 129                     G_SIGNAL_RUN_LAST,
 130                     G_STRUCT_OFFSET (GDriveIface, disconnected),
 131                     NULL, NULL,
 132                     g_cclosure_marshal_VOID__VOID,
 133                     G_TYPE_NONE, 0);
 134
 135       /**
 136       * GDrive::eject-button:
 137       * @drive: a #GDrive.
 138       *
 139       * Emitted when the physical eject button (if any) of a drive have been pressed.
 140       *
 141       **/
 142       g_signal_new (I_("eject-button"),
 143                     G_TYPE_DRIVE,
 144                     G_SIGNAL_RUN_LAST,
 145                     G_STRUCT_OFFSET (GDriveIface, eject_button),
 146                     NULL, NULL,
 147                     g_cclosure_marshal_VOID__VOID,
 148                     G_TYPE_NONE, 0);
 149
 150       initialized = TRUE;
 151     }
 152 }
 153
 154 /**
 155  * g_drive_get_name:
 156  * @drive: a #GDrive.
 157  *
 158  * Gets the name of @drive.
 159  *
 160  * Returns: a string containing @drive's name. The returned
 161  *     string should be freed when no longer needed.
 162  **/
 163 char *
 164 g_drive_get_name (GDrive *drive)
 165 {
 166   GDriveIface *iface;
 167
 168   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 169
 170   iface = G_DRIVE_GET_IFACE (drive);
 171
 172   return (* iface->get_name) (drive);
 173 }
 174
 175 /**
 176  * g_drive_get_icon:
 177  * @drive: a #GDrive.
 178  *
 179  * Gets the icon for @drive.
 180  *
 181  * Returns: #GIcon for the @drive.
 182  **/
 183 GIcon *
 184 g_drive_get_icon (GDrive *drive)
 185 {
 186   GDriveIface *iface;
 187
 188   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 189
 190   iface = G_DRIVE_GET_IFACE (drive);
 191
 192   return (* iface->get_icon) (drive);
 193 }
 194
 195 /**
 196  * g_drive_has_volumes:
 197  * @drive: a #GDrive.
 198  *
 199  * Check if @drive has any mountable volumes.
 200  *
 201  * Returns: %TRUE if the @drive contains volumes, %FALSE otherwise.
 202  **/
 203 gboolean
 204 g_drive_has_volumes (GDrive *drive)
 205 {
 206   GDriveIface *iface;
 207
 208   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 209
 210   iface = G_DRIVE_GET_IFACE (drive);
 211
 212   return (* iface->has_volumes) (drive);
 213 }
 214
 215 /**
 216  * g_drive_get_volumes:
 217  * @drive: a #GDrive.
 218  *
 219  * Get a list of mountable volumes for @drive.
 220  *
 221  * The returned list should be freed with g_list_free(), after
 222  * its elements have been unreffed with g_object_unref().
 223  *
 224  * Returns: #GList containing any #GVolume<!---->s on the given @drive.
 225  **/
 226 GList *
 227 g_drive_get_volumes (GDrive *drive)
 228 {
 229   GDriveIface *iface;
 230
 231   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 232
 233   iface = G_DRIVE_GET_IFACE (drive);
 234
 235   return (* iface->get_volumes) (drive);
 236 }
 237
 238 /**
 239  * g_drive_is_media_check_automatic:
 240  * @drive: a #GDrive.
 241  *
 242  * Checks if @drive is capabable of automatically detecting media changes.
 243  *
 244  * Returns: %TRUE if the @drive is capabable of automatically detecting media changes, %FALSE otherwise.
 245  **/
 246 gboolean
 247 g_drive_is_media_check_automatic (GDrive *drive)
 248 {
 249   GDriveIface *iface;
 250
 251   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 252
 253   iface = G_DRIVE_GET_IFACE (drive);
 254
 255   return (* iface->is_media_check_automatic) (drive);
 256 }
 257
 258 /**
 259  * g_drive_is_media_removable:
 260  * @drive: a #GDrive.
 261  *
 262  * Checks if the @drive supports removable media.
 263  *
 264  * Returns: %TRUE if @drive supports removable media, %FALSE otherwise.
 265  **/
 266 gboolean
 267 g_drive_is_media_removable (GDrive *drive)
 268 {
 269   GDriveIface *iface;
 270
 271   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 272
 273   iface = G_DRIVE_GET_IFACE (drive);
 274
 275   return (* iface->is_media_removable) (drive);
 276 }
 277
 278 /**
 279  * g_drive_has_media:
 280  * @drive: a #GDrive.
 281  *
 282  * Checks if the @drive has media. Note that the OS may not be polling
 283  * the drive for media changes; see g_drive_is_media_check_automatic()
 284  * for more details.
 285  *
 286  * Returns: %TRUE if @drive has media, %FALSE otherwise.
 287  **/
 288 gboolean
 289 g_drive_has_media (GDrive *drive)
 290 {
 291   GDriveIface *iface;
 292
 293   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 294
 295   iface = G_DRIVE_GET_IFACE (drive);
 296
 297   return (* iface->has_media) (drive);
 298 }
 299
 300 /**
 301  * g_drive_can_eject:
 302  * @drive: pointer to a #GDrive.
 303  *
 304  * Checks if a drive can be ejected.
 305  *
 306  * Returns: %TRUE if the @drive can be ejected. %FALSE otherwise.
 307  **/
 308 gboolean
 309 g_drive_can_eject (GDrive *drive)
 310 {
 311   GDriveIface *iface;
 312
 313   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 314
 315   iface = G_DRIVE_GET_IFACE (drive);
 316
 317   if (iface->can_eject == NULL)
 318     return FALSE;
 319
 320   return (* iface->can_eject) (drive);
 321 }
 322
 323 /**
 324  * g_drive_can_poll_for_media:
 325  * @drive: a #GDrive.
 326  *
 327  * Checks if a drive can be polled for media changes.
 328  *
 329  * Returns: %TRUE if the @drive can be polled for media changes. %FALSE otherwise.
 330  **/
 331 gboolean
 332 g_drive_can_poll_for_media (GDrive *drive)
 333 {
 334   GDriveIface *iface;
 335
 336   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 337
 338   iface = G_DRIVE_GET_IFACE (drive);
 339
 340   if (iface->poll_for_media == NULL)
 341     return FALSE;
 342
 343   return (* iface->can_poll_for_media) (drive);
 344 }
 345
 346 /**
 347  * g_drive_eject:
 348  * @drive: a #GDrive.
 349  * @flags: flags affecting the unmount if required for eject
 350  * @cancellable: optional #GCancellable object, %NULL to ignore.
 351  * @callback: a #GAsyncReadyCallback, or %NULL.
 352  * @user_data: a #gpointer.
 353  *
 354  * Ejects a drive.
 355  *
 356  **/
 357 void
 358 g_drive_eject (GDrive              *drive,
 359                GMountUnmountFlags   flags,
 360                GCancellable        *cancellable,
 361                GAsyncReadyCallback  callback,
 362                gpointer             user_data)
 363 {
 364   GDriveIface *iface;
 365
 366   g_return_if_fail (G_IS_DRIVE (drive));
 367
 368   iface = G_DRIVE_GET_IFACE (drive);
 369
 370   if (iface->eject == NULL)
 371     {
 372       g_simple_async_report_error_in_idle (G_OBJECT (drive), callback, user_data,
 373                                            G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 374                                            _("drive doesn't implement eject"));
 375
 376       return;
 377     }
 378
 379   (* iface->eject) (drive, flags, cancellable, callback, user_data);
 380 }
 381
 382 /**
 383  * g_drive_eject_finish
 384  * @drive: a #GDrive.
 385  * @result: a #GAsyncResult.
 386  * @error: a #GError.
 387  *
 388  * Finishes ejecting a drive.
 389  *
 390  * Returns: %TRUE if the drive has been ejected successfully,
 391  * %FALSE otherwise.
 392  **/
 393 gboolean
 394 g_drive_eject_finish (GDrive        *drive,
 395                       GAsyncResult  *result,
 396                       GError       **error)
 397 {
 398   GDriveIface *iface;
 399
 400   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 401   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 402
 403   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 404     {
 405       GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 406       if (g_simple_async_result_propagate_error (simple, error))
 407         return FALSE;
 408     }
 409
 410   iface = G_DRIVE_GET_IFACE (drive);
 411
 412   return (* iface->eject_finish) (drive, result, error);
 413 }
 414
 415 /**
 416  * g_drive_poll_for_media:
 417  * @drive: a #GDrive.
 418  * @cancellable: optional #GCancellable object, %NULL to ignore.
 419  * @callback: a #GAsyncReadyCallback, or %NULL.
 420  * @user_data: a #gpointer.
 421  *
 422  * Polls @drive to see if media has been inserted or removed.
 423  *
 424  **/
 425 void
 426 g_drive_poll_for_media (GDrive              *drive,
 427                         GCancellable        *cancellable,
 428                         GAsyncReadyCallback  callback,
 429                         gpointer             user_data)
 430 {
 431   GDriveIface *iface;
 432
 433   g_return_if_fail (G_IS_DRIVE (drive));
 434
 435   iface = G_DRIVE_GET_IFACE (drive);
 436
 437   if (iface->poll_for_media == NULL)
 438     {
 439       g_simple_async_report_error_in_idle (G_OBJECT (drive), callback, user_data,
 440                                            G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 441                                            _("drive doesn't implement polling for media"));
 442
 443       return;
 444     }
 445
 446   (* iface->poll_for_media) (drive, cancellable, callback, user_data);
 447 }
 448
 449 /**
 450  * g_drive_poll_for_media_finish
 451  * @drive: a #GDrive.
 452  * @result: a #GAsyncResult.
 453  * @error: a #GError.
 454  *
 455  * Finishes poll_for_mediaing a drive.
 456  *
 457  * Returns: %TRUE if the drive has been poll_for_mediaed successfully,
 458  * %FALSE otherwise.
 459  **/
 460 gboolean
 461 g_drive_poll_for_media_finish (GDrive        *drive,
 462                                GAsyncResult  *result,
 463                                GError       **error)
 464 {
 465   GDriveIface *iface;
 466
 467   g_return_val_if_fail (G_IS_DRIVE (drive), FALSE);
 468   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 469
 470   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 471     {
 472       GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 473       if (g_simple_async_result_propagate_error (simple, error))
 474         return FALSE;
 475     }
 476
 477   iface = G_DRIVE_GET_IFACE (drive);
 478
 479   return (* iface->poll_for_media_finish) (drive, result, error);
 480 }
 481
 482 /**
 483  * g_drive_get_identifier:
 484  * @drive: a #GDrive
 485  * @kind: the kind of identifier to return
 486  *
 487  * Gets the identifier of the given kind for @drive.
 488  *
 489  * Returns: a newly allocated string containing the
 490  *   requested identfier, or %NULL if the #GDrive
 491  *   doesn't have this kind of identifier
 492  */
 493 char *
 494 g_drive_get_identifier (GDrive     *drive,
 495                         const char *kind)
 496 {
 497   GDriveIface *iface;
 498
 499   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 500   g_return_val_if_fail (kind != NULL, NULL);
 501
 502   iface = G_DRIVE_GET_IFACE (drive);
 503
 504   if (iface->get_identifier == NULL)
 505     return NULL;
 506
 507   return (* iface->get_identifier) (drive, kind);
 508 }
 509
 510 /**
 511  * g_drive_enumerate_identifiers:
 512  * @drive: a #GDrive
 513  *
 514  * Gets the kinds of identifiers that @drive has.
 515  * Use g_drive_get_identifer() to obtain the identifiers
 516  * themselves.
 517  *
 518  * Returns: a %NULL-terminated array of strings containing
 519  *   kinds of identifiers. Use g_strfreev() to free.
 520  */
 521 char **
 522 g_drive_enumerate_identifiers (GDrive *drive)
 523 {
 524   GDriveIface *iface;
 525
 526   g_return_val_if_fail (G_IS_DRIVE (drive), NULL);
 527   iface = G_DRIVE_GET_IFACE (drive);
 528
 529   if (iface->enumerate_identifiers == NULL)
 530     return NULL;
 531
 532   return (* iface->enumerate_identifiers) (drive);
 533 }
 534
 535
 536 #define __G_DRIVE_C__
 537 #include "gioaliasdef.c"