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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2015-09-08 01:01:14 -0300
commite5fd91f1ef340da553f7a79da9540c3db711c937 (patch)
treeb11842027dc6641da63f4bcc524f8678263304a3 /ipc/kdbus/names.h
parent2a9b0348e685a63d97486f6749622b61e9e3292f (diff)
Linux-libre 4.2-gnu
Diffstat (limited to 'ipc/kdbus/names.h')
-rw-r--r--ipc/kdbus/names.h55
1 files changed, 43 insertions, 12 deletions
diff --git a/ipc/kdbus/names.h b/ipc/kdbus/names.h
index 3dd258929..edac59ddd 100644
--- a/ipc/kdbus/names.h
+++ b/ipc/kdbus/names.h
@@ -18,6 +18,10 @@
#include <linux/hashtable.h>
#include <linux/rwsem.h>
+struct kdbus_name_entry;
+struct kdbus_name_owner;
+struct kdbus_name_registry;
+
/**
* struct kdbus_name_registry - names registered for a bus
* @entries_hash: Map of entries
@@ -32,27 +36,37 @@ struct kdbus_name_registry {
/**
* struct kdbus_name_entry - well-know name entry
- * @name_id: Sequence number of name entry to be able to uniquely
+ * @name_id: sequence number of name entry to be able to uniquely
* identify a name over its registration lifetime
- * @flags: KDBUS_NAME_* flags
- * @conn: Connection owning the name
- * @activator: Connection of the activator queuing incoming messages
- * @queue: List of queued connections
- * @conn_entry: Entry in connection
- * @hentry: Entry in registry map
- * @name: The well-known name
+ * @activator: activator of this name, or NULL
+ * @queue: list of queued owners
+ * @hentry: entry in registry map
+ * @name: well-known name
*/
struct kdbus_name_entry {
u64 name_id;
- u64 flags;
- struct kdbus_conn *conn;
- struct kdbus_conn *activator;
+ struct kdbus_name_owner *activator;
struct list_head queue;
- struct list_head conn_entry;
struct hlist_node hentry;
char name[];
};
+/**
+ * struct kdbus_name_owner - owner of a well-known name
+ * @flags: KDBUS_NAME_* flags of this owner
+ * @conn: connection owning the name
+ * @name: name that is owned
+ * @conn_entry: link into @conn
+ * @name_entry: link into @name
+ */
+struct kdbus_name_owner {
+ u64 flags;
+ struct kdbus_conn *conn;
+ struct kdbus_name_entry *name;
+ struct list_head conn_entry;
+ struct list_head name_entry;
+};
+
bool kdbus_name_is_valid(const char *p, bool allow_wildcard);
struct kdbus_name_registry *kdbus_name_registry_new(void);
@@ -71,4 +85,21 @@ int kdbus_cmd_name_acquire(struct kdbus_conn *conn, void __user *argp);
int kdbus_cmd_name_release(struct kdbus_conn *conn, void __user *argp);
int kdbus_cmd_list(struct kdbus_conn *conn, void __user *argp);
+/**
+ * kdbus_name_get_owner() - get current owner of a name
+ * @name: name to get current owner of
+ *
+ * This returns a pointer to the current owner of a name (or its activator if
+ * there is no owner). The caller must make sure @name is valid and does not
+ * vanish.
+ *
+ * Return: Pointer to current owner or NULL if there is none.
+ */
+static inline struct kdbus_name_owner *
+kdbus_name_get_owner(struct kdbus_name_entry *name)
+{
+ return list_first_entry_or_null(&name->queue, struct kdbus_name_owner,
+ name_entry) ? : name->activator;
+}
+
#endif