diff options
Diffstat (limited to 'ipc/kdbus/names.h')
| -rw-r--r-- | ipc/kdbus/names.h | 55 |
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 |