glib/gio/gunionvolumemonitor.c
Matthias Clasen aef5a4b0ab Remove C99 comments
svn path=/trunk/; revision=6166
2007-12-20 03:12:24 +00:00

696 lines
19 KiB
C

/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2006-2007 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General
* Public License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*
* Author: Alexander Larsson <alexl@redhat.com>
* David Zeuthen <davidz@redhat.com>
*/
#include <config.h>
#include <string.h>
#include <glib.h>
#include "gunionvolumemonitor.h"
#include "gmountprivate.h"
#include "giomodule-priv.h"
#ifdef G_OS_UNIX
#include "gunixvolumemonitor.h"
#endif
#include "gnativevolumemonitor.h"
#include "glibintl.h"
#include "gioalias.h"
struct _GUnionVolumeMonitor {
GVolumeMonitor parent;
GList *monitors;
};
static void g_union_volume_monitor_remove_monitor (GUnionVolumeMonitor *union_monitor,
GVolumeMonitor *child_monitor);
#define g_union_volume_monitor_get_type _g_union_volume_monitor_get_type
G_DEFINE_TYPE (GUnionVolumeMonitor, g_union_volume_monitor, G_TYPE_VOLUME_MONITOR);
G_LOCK_DEFINE_STATIC(the_volume_monitor);
static GUnionVolumeMonitor *the_volume_monitor = NULL;
static void
g_union_volume_monitor_finalize (GObject *object)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
monitor = G_UNION_VOLUME_MONITOR (object);
while (monitor->monitors != NULL) {
child_monitor = monitor->monitors->data;
g_union_volume_monitor_remove_monitor (monitor,
child_monitor);
g_object_unref (child_monitor);
}
if (G_OBJECT_CLASS (g_union_volume_monitor_parent_class)->finalize)
(*G_OBJECT_CLASS (g_union_volume_monitor_parent_class)->finalize) (object);
}
static void
g_union_volume_monitor_dispose (GObject *object)
{
GUnionVolumeMonitor *monitor;
monitor = G_UNION_VOLUME_MONITOR (object);
G_LOCK (the_volume_monitor);
the_volume_monitor = NULL;
G_UNLOCK (the_volume_monitor);
if (G_OBJECT_CLASS (g_union_volume_monitor_parent_class)->dispose)
(*G_OBJECT_CLASS (g_union_volume_monitor_parent_class)->dispose) (object);
}
static GList *
get_mounts (GVolumeMonitor *volume_monitor)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
GList *res;
GList *l;
monitor = G_UNION_VOLUME_MONITOR (volume_monitor);
res = NULL;
G_LOCK (the_volume_monitor);
for (l = monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
res = g_list_concat (res, g_volume_monitor_get_mounts (child_monitor));
}
G_UNLOCK (the_volume_monitor);
return res;
}
static GList *
get_volumes (GVolumeMonitor *volume_monitor)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
GList *res;
GList *l;
monitor = G_UNION_VOLUME_MONITOR (volume_monitor);
res = NULL;
G_LOCK (the_volume_monitor);
for (l = monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
res = g_list_concat (res, g_volume_monitor_get_volumes (child_monitor));
}
G_UNLOCK (the_volume_monitor);
return res;
}
static GList *
get_connected_drives (GVolumeMonitor *volume_monitor)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
GList *res;
GList *l;
monitor = G_UNION_VOLUME_MONITOR (volume_monitor);
res = NULL;
G_LOCK (the_volume_monitor);
for (l = monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
res = g_list_concat (res, g_volume_monitor_get_connected_drives (child_monitor));
}
G_UNLOCK (the_volume_monitor);
return res;
}
static GVolume *
get_volume_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
GVolume *volume;
GList *l;
monitor = G_UNION_VOLUME_MONITOR (volume_monitor);
volume = NULL;
G_LOCK (the_volume_monitor);
for (l = monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
volume = g_volume_monitor_get_volume_for_uuid (child_monitor, uuid);
if (volume != NULL)
break;
}
G_UNLOCK (the_volume_monitor);
return volume;
}
static GMount *
get_mount_for_uuid (GVolumeMonitor *volume_monitor, const char *uuid)
{
GUnionVolumeMonitor *monitor;
GVolumeMonitor *child_monitor;
GMount *mount;
GList *l;
monitor = G_UNION_VOLUME_MONITOR (volume_monitor);
mount = NULL;
G_LOCK (the_volume_monitor);
for (l = monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
mount = g_volume_monitor_get_mount_for_uuid (child_monitor, uuid);
if (mount != NULL)
break;
}
G_UNLOCK (the_volume_monitor);
return mount;
}
static void
g_union_volume_monitor_class_init (GUnionVolumeMonitorClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
GVolumeMonitorClass *monitor_class = G_VOLUME_MONITOR_CLASS (klass);
gobject_class->finalize = g_union_volume_monitor_finalize;
gobject_class->dispose = g_union_volume_monitor_dispose;
monitor_class->get_connected_drives = get_connected_drives;
monitor_class->get_volumes = get_volumes;
monitor_class->get_mounts = get_mounts;
monitor_class->get_volume_for_uuid = get_volume_for_uuid;
monitor_class->get_mount_for_uuid = get_mount_for_uuid;
}
static void
child_volume_added (GVolumeMonitor *child_monitor,
GVolume *child_volume,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"volume_added",
child_volume);
}
static void
child_volume_removed (GVolumeMonitor *child_monitor,
GVolume *child_volume,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"volume_removed",
child_volume);
}
static void
child_volume_changed (GVolumeMonitor *child_monitor,
GVolume *child_volume,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"volume_changed",
child_volume);
}
static void
child_mount_added (GVolumeMonitor *child_monitor,
GMount *child_mount,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"mount_added",
child_mount);
}
static void
child_mount_removed (GVolumeMonitor *child_monitor,
GMount *child_mount,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"mount_removed",
child_mount);
}
static void
child_mount_pre_unmount (GVolumeMonitor *child_monitor,
GMount *child_mount,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"mount_pre_unmount",
child_mount);
}
static void
child_mount_changed (GVolumeMonitor *child_monitor,
GMount *child_mount,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"mount_changed",
child_mount);
}
static void
child_drive_connected (GVolumeMonitor *child_monitor,
GDrive *child_drive,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"drive_connected",
child_drive);
}
static void
child_drive_disconnected (GVolumeMonitor *child_monitor,
GDrive *child_drive,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"drive_disconnected",
child_drive);
}
static void
child_drive_changed (GVolumeMonitor *child_monitor,
GDrive *child_drive,
GUnionVolumeMonitor *union_monitor)
{
g_signal_emit_by_name (union_monitor,
"drive_changed",
child_drive);
}
static void
g_union_volume_monitor_add_monitor (GUnionVolumeMonitor *union_monitor,
GVolumeMonitor *volume_monitor)
{
if (g_list_find (union_monitor->monitors, volume_monitor))
return;
union_monitor->monitors =
g_list_prepend (union_monitor->monitors,
g_object_ref (volume_monitor));
g_signal_connect (volume_monitor, "volume_added", (GCallback)child_volume_added, union_monitor);
g_signal_connect (volume_monitor, "volume_removed", (GCallback)child_volume_removed, union_monitor);
g_signal_connect (volume_monitor, "volume_changed", (GCallback)child_volume_changed, union_monitor);
g_signal_connect (volume_monitor, "mount_added", (GCallback)child_mount_added, union_monitor);
g_signal_connect (volume_monitor, "mount_removed", (GCallback)child_mount_removed, union_monitor);
g_signal_connect (volume_monitor, "mount_pre_unmount", (GCallback)child_mount_pre_unmount, union_monitor);
g_signal_connect (volume_monitor, "mount_changed", (GCallback)child_mount_changed, union_monitor);
g_signal_connect (volume_monitor, "drive_connected", (GCallback)child_drive_connected, union_monitor);
g_signal_connect (volume_monitor, "drive_disconnected", (GCallback)child_drive_disconnected, union_monitor);
g_signal_connect (volume_monitor, "drive_changed", (GCallback)child_drive_changed, union_monitor);
}
static void
g_union_volume_monitor_remove_monitor (GUnionVolumeMonitor *union_monitor,
GVolumeMonitor *child_monitor)
{
GList *l;
l = g_list_find (union_monitor->monitors, child_monitor);
if (l == NULL)
return;
union_monitor->monitors = g_list_delete_link (union_monitor->monitors, l);
g_signal_handlers_disconnect_by_func (child_monitor, child_volume_added, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_volume_removed, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_volume_changed, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_mount_added, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_mount_removed, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_mount_pre_unmount, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_mount_changed, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_drive_connected, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_drive_disconnected, union_monitor);
g_signal_handlers_disconnect_by_func (child_monitor, child_drive_changed, union_monitor);
}
/* Note: This compares in reverse order.
Higher prio -> sort first
*/
static gint
compare_monitor_type (gconstpointer a,
gconstpointer b,
gpointer user_data)
{
GType a_type, b_type;
char *a_name, *b_name;
int a_prio, b_prio;
gint res;
const char *use_this_monitor;
GQuark private_q, name_q;
private_q = g_quark_from_static_string ("gio-prio");
name_q = g_quark_from_static_string ("gio-name");
use_this_monitor = user_data;
a_type = *(GType *)a;
b_type = *(GType *)b;
a_prio = GPOINTER_TO_INT (g_type_get_qdata (a_type, private_q));
a_name = g_type_get_qdata (a_type, name_q);
b_prio = GPOINTER_TO_INT (g_type_get_qdata (b_type, private_q));
b_name = g_type_get_qdata (b_type, name_q);
if (a_type == b_type)
res = 0;
else if (use_this_monitor != NULL &&
strcmp (a_name, use_this_monitor) == 0)
res = -1;
else if (use_this_monitor != NULL &&
strcmp (b_name, use_this_monitor) == 0)
res = 1;
else
res = b_prio - a_prio;
return res;
}
static GType
get_default_native_class (gpointer data)
{
GNativeVolumeMonitorClass *klass, *native_class, **native_class_out;
GType *monitors;
guint n_monitors;
const char *use_this;
int i;
native_class_out = data;
use_this = g_getenv ("GIO_USE_VOLUME_MONITOR");
/* Ensure vfs in modules loaded */
_g_io_modules_ensure_loaded ();
monitors = g_type_children (G_TYPE_NATIVE_VOLUME_MONITOR, &n_monitors);
g_qsort_with_data (monitors,
n_monitors,
sizeof (GType),
compare_monitor_type,
(gpointer)use_this);
native_class = NULL;
for (i = 0; i < n_monitors; i++)
{
klass = g_type_class_ref (monitors[i]);
if (G_VOLUME_MONITOR_CLASS (klass)->is_supported())
{
native_class = klass;
break;
}
else
g_type_class_unref (klass);
}
g_free (monitors);
if (native_class)
{
*native_class_out = native_class;
return G_TYPE_FROM_CLASS (native_class);
}
else
return G_TYPE_INVALID;
}
/* We return the class, with a ref taken.
* This way we avoid unloading the class/module
* between selecting the type and creating the
* instance on the first call.
*/
static GNativeVolumeMonitorClass *
get_native_class ()
{
static GOnce once_init = G_ONCE_INIT;
GTypeClass *type_class;
type_class = NULL;
g_once (&once_init, (GThreadFunc)get_default_native_class, &type_class);
if (type_class == NULL && once_init.retval != G_TYPE_INVALID)
type_class = g_type_class_ref ((GType)once_init.retval);
return (GNativeVolumeMonitorClass *)type_class;
}
static void
g_union_volume_monitor_init (GUnionVolumeMonitor *union_monitor)
{
GVolumeMonitor *monitor;
GType *monitors;
guint n_monitors;
GNativeVolumeMonitorClass *native_class;
GVolumeMonitorClass *klass;
int i;
native_class = get_native_class ();
if (native_class != NULL)
{
monitor = g_object_new (G_TYPE_FROM_CLASS (native_class), NULL);
g_union_volume_monitor_add_monitor (union_monitor, monitor);
g_object_unref (monitor);
g_type_class_unref (native_class);
}
monitors = g_type_children (G_TYPE_VOLUME_MONITOR, &n_monitors);
for (i = 0; i < n_monitors; i++)
{
if (monitors[i] == G_TYPE_UNION_VOLUME_MONITOR ||
g_type_is_a (monitors[i], G_TYPE_NATIVE_VOLUME_MONITOR))
continue;
klass = g_type_class_ref (monitors[i]);
if (klass->is_supported == NULL || klass->is_supported())
{
monitor = g_object_new (monitors[i], NULL);
g_union_volume_monitor_add_monitor (union_monitor, monitor);
g_object_unref (monitor);
}
g_type_class_unref (klass);
}
g_free (monitors);
}
static GUnionVolumeMonitor *
g_union_volume_monitor_new (void)
{
GUnionVolumeMonitor *monitor;
monitor = g_object_new (G_TYPE_UNION_VOLUME_MONITOR, NULL);
return monitor;
}
/**
* g_volume_monitor_get:
*
* Gets the volume monitor used by gio.
*
* Returns: a reference to the #GVolumeMonitor used by gio. Call
* g_object_unref() when done with it.
**/
GVolumeMonitor *
g_volume_monitor_get (void)
{
GVolumeMonitor *vm;
G_LOCK (the_volume_monitor);
if (the_volume_monitor)
vm = G_VOLUME_MONITOR (g_object_ref (the_volume_monitor));
else
{
the_volume_monitor = g_union_volume_monitor_new ();
vm = G_VOLUME_MONITOR (the_volume_monitor);
}
G_UNLOCK (the_volume_monitor);
return vm;
}
/**
* _g_mount_get_for_mount_path:
* @mountpoint: a string.
* @cancellable: a #GCancellable, or %NULL
*
* Returns: a #GMount for given @mount_path or %NULL.
**/
GMount *
_g_mount_get_for_mount_path (const char *mount_path,
GCancellable *cancellable)
{
GNativeVolumeMonitorClass *klass;
GMount *mount;
klass = get_native_class ();
if (klass == NULL)
return NULL;
mount = NULL;
if (klass->get_mount_for_mount_path)
{
G_LOCK (the_volume_monitor);
mount = klass->get_mount_for_mount_path (mount_path, cancellable);
G_UNLOCK (the_volume_monitor);
}
/* TODO: How do we know this succeeded? Keep in mind that the native
* volume monitor may fail (e.g. not being able to connect to
* hald). Is the get_mount_for_mount_path() method allowed to
* return NULL? Seems like it is ... probably the method needs
* to take a boolean and write if it succeeds or not.. Messy.
* Very messy.
*/
g_type_class_unref (klass);
return mount;
}
/**
* g_volume_monitor_adopt_orphan_mount:
* @mount: a #GMount object to find a parent for
*
* This function should be called by any #GVolumeMonitor
* implementation when a new #GMount object is created that is not
* associated with a #GVolume object. It must be called just before
* emitting the @mount_added signal.
*
* If the return value is not %NULL, the caller must associate the
* returned #GVolume object with the #GMount. This involves returning
* it in it's g_mount_get_volume() implementation. The caller must
* also listen for the "removed" signal on the returned object
* and give up it's reference when handling that signal
*
* Similary, if implementing g_volume_monitor_adopt_orphan_mount(),
* the implementor must take a reference to @mount and return it in
* it's g_volume_get_mount() implemented. Also, the implementor must
* listen for the "unmounted" signal on @mount and give up it's
* reference upon handling that signal.
*
* There are two main use cases for this function.
*
* One is when implementing a user space file system driver that reads
* blocks of a block device that is already represented by the native
* volume monitor (for example a CD Audio file system driver). Such
* a driver will generate it's own #GMount object that needs to be
* assoicated with the #GVolume object that represents the volume.
*
* The other is for implementing a #GVolumeMonitor whose sole purpose
* is to return #GVolume objects representing entries in the users
* "favorite servers" list or similar.
*
* Returns: the #GVolume object that is the parent for @mount or %NULL
* if no wants to adopt the #GMount.
*/
GVolume *
g_volume_monitor_adopt_orphan_mount (GMount *mount)
{
GVolumeMonitor *child_monitor;
GVolumeMonitorClass *child_monitor_class;
GVolume *volume;
GList *l;
g_return_val_if_fail (mount != NULL, NULL);
if (the_volume_monitor == NULL)
return NULL;
volume = NULL;
/* TODO: nasty locking issues because current VM's don't emit signals in idle */
/*G_LOCK (the_volume_monitor);*/
for (l = the_volume_monitor->monitors; l != NULL; l = l->next)
{
child_monitor = l->data;
child_monitor_class = G_VOLUME_MONITOR_GET_CLASS (child_monitor);
if (child_monitor_class->adopt_orphan_mount != NULL)
{
volume = child_monitor_class->adopt_orphan_mount (mount);
if (volume != NULL)
break;
}
}
/*G_UNLOCK (the_volume_monitor);*/
return volume;
}
#define __G_UNION_VOLUME_MONITOR_C__
#include "gioaliasdef.c"