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netlink: implement generic group subscription

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Needed by the IPv6 manager.
This commit is contained in:
Dan Williams
2010-04-20 16:32:03 -07:00
parent b3d8337465
commit d1c7c37863
2 changed files with 90 additions and 8 deletions
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86
src/nm-netlink-monitor.c
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@@ -66,6 +66,8 @@ typedef struct {
guint event_id;
guint request_status_id;
GHashTable *subscriptions;
} NMNetlinkMonitorPrivate;
enum {
@@ -263,13 +265,9 @@ nm_netlink_monitor_open_connection (NMNetlinkMonitor *self, GError **error)
goto error;
}
if (nl_socket_add_membership (priv->nlh, RTNLGRP_LINK) < 0) {
g_set_error (error, NM_NETLINK_MONITOR_ERROR,
NM_NETLINK_MONITOR_ERROR_NETLINK_JOIN_GROUP,
_("unable to join netlink group for monitoring link status: %s"),
nl_geterror ());
/* Subscribe to the LINK group for internal carrier signals */
if (!nm_netlink_monitor_subscribe (self, RTNLGRP_LINK, error))
goto error;
}
if ((priv->nlh_link_cache = rtnl_link_alloc_cache (priv->nlh)) == NULL) {
g_set_error (error, NM_NETLINK_MONITOR_ERROR,
@@ -373,6 +371,77 @@ nm_netlink_monitor_detach (NMNetlinkMonitor *self)
priv->event_id = 0;
}
static int
get_subs (NMNetlinkMonitor *self, int group)
{
NMNetlinkMonitorPrivate *priv = NM_NETLINK_MONITOR_GET_PRIVATE (self);
return GPOINTER_TO_INT (g_hash_table_lookup (priv->subscriptions,
GINT_TO_POINTER (group)));
}
static void
set_subs (NMNetlinkMonitor *self, int group, int new_subs)
{
NMNetlinkMonitorPrivate *priv = NM_NETLINK_MONITOR_GET_PRIVATE (self);
g_hash_table_insert (priv->subscriptions,
GINT_TO_POINTER (group),
GINT_TO_POINTER (new_subs));
}
gboolean
nm_netlink_monitor_subscribe (NMNetlinkMonitor *self, int group, GError **error)
{
NMNetlinkMonitorPrivate *priv;
int subs;
g_return_val_if_fail (NM_IS_NETLINK_MONITOR (self), FALSE);
priv = NM_NETLINK_MONITOR_GET_PRIVATE (self);
if (!priv->nlh) {
if (!nm_netlink_monitor_open_connection (self, error))
return FALSE;
}
subs = get_subs (self, group) + 1;
if (subs == 1) {
if (nl_socket_add_membership (priv->nlh, group) < 0) {
g_set_error (error, NM_NETLINK_MONITOR_ERROR,
NM_NETLINK_MONITOR_ERROR_NETLINK_JOIN_GROUP,
_("unable to join netlink group: %s"),
nl_geterror ());
return FALSE;
}
}
/* Update # of subscriptions for this group */
set_subs (self, group, subs);
return TRUE;
}
void
nm_netlink_monitor_unsubscribe (NMNetlinkMonitor *self, int group)
{
NMNetlinkMonitorPrivate *priv;
int subs;
g_return_if_fail (self != NULL);
g_return_if_fail (NM_IS_NETLINK_MONITOR (self));
priv = NM_NETLINK_MONITOR_GET_PRIVATE (self);
g_return_if_fail (priv->nlh != NULL);
subs = get_subs (self, group) - 1;
if (subs == 0)
nl_socket_drop_membership (priv->nlh, group);
/* Update # of subscriptions for this group */
set_subs (self, group, subs);
}
static gboolean
deferred_emit_carrier_state (gpointer user_data)
{
@@ -515,6 +584,9 @@ nm_netlink_monitor_get (void)
static void
nm_netlink_monitor_init (NMNetlinkMonitor *self)
{
NMNetlinkMonitorPrivate *priv = NM_NETLINK_MONITOR_GET_PRIVATE (self);
priv->subscriptions = g_hash_table_new (g_int_hash, g_int_equal);
}
static void
@@ -543,6 +615,8 @@ finalize (GObject *object)
priv->nlh_cb = NULL;
}
g_hash_table_destroy (priv->subscriptions);
G_OBJECT_CLASS (nm_netlink_monitor_parent_class)->finalize (object);
}