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Diffstat (limited to 'ipc/kdbus/names.h')
| -rw-r--r-- | ipc/kdbus/names.h | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/ipc/kdbus/names.h b/ipc/kdbus/names.h new file mode 100644 index 000000000000..edac59ddd8ee --- /dev/null +++ b/ipc/kdbus/names.h @@ -0,0 +1,105 @@ +/* + * Copyright (C) 2013-2015 Kay Sievers + * Copyright (C) 2013-2015 Greg Kroah-Hartman <gregkh@linuxfoundation.org> + * Copyright (C) 2013-2015 Daniel Mack <daniel@zonque.org> + * Copyright (C) 2013-2015 David Herrmann <dh.herrmann@gmail.com> + * Copyright (C) 2013-2015 Linux Foundation + * Copyright (C) 2014-2015 Djalal Harouni <tixxdz@opendz.org> + * + * kdbus 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 2.1 of the License, or (at + * your option) any later version. + */ + +#ifndef __KDBUS_NAMES_H +#define __KDBUS_NAMES_H + +#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 + * @lock: Registry data lock + * @name_seq_last: Last used sequence number to assign to a name entry + */ +struct kdbus_name_registry { + DECLARE_HASHTABLE(entries_hash, 8); + struct rw_semaphore rwlock; + u64 name_seq_last; +}; + +/** + * struct kdbus_name_entry - well-know name entry + * @name_id: sequence number of name entry to be able to uniquely + * identify a name over its registration lifetime + * @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; + struct kdbus_name_owner *activator; + struct list_head queue; + 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); +void kdbus_name_registry_free(struct kdbus_name_registry *reg); + +struct kdbus_name_entry * +kdbus_name_lookup_unlocked(struct kdbus_name_registry *reg, const char *name); + +int kdbus_name_acquire(struct kdbus_name_registry *reg, + struct kdbus_conn *conn, const char *name, + u64 flags, u64 *return_flags); +void kdbus_name_release_all(struct kdbus_name_registry *reg, + struct kdbus_conn *conn); + +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 |