diff options
Diffstat (limited to 'src/libsystemd-bus/kdbus.h')
| -rw-r--r-- | src/libsystemd-bus/kdbus.h | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/src/libsystemd-bus/kdbus.h b/src/libsystemd-bus/kdbus.h index 48a84402be..8db165c9ab 100644 --- a/src/libsystemd-bus/kdbus.h +++ b/src/libsystemd-bus/kdbus.h @@ -314,8 +314,9 @@ struct kdbus_item { /** * enum kdbus_msg_flags - type of message * @KDBUS_MSG_FLAGS_EXPECT_REPLY: Expect a reply message, used for method - * calls. The cookie identifies the - * message and the respective reply + * calls. The userspace-supplied cookie identifies + * the message and the respective reply + * carries the cookie in cookie_reply * @KDBUS_MSG_FLAGS_NO_AUTO_START: Do not start a service, if the addressed * name is not currently active */ @@ -341,9 +342,11 @@ enum kdbus_payload_type { * @dst_id: 64-bit ID of the destination connection * @src_id: 64-bit ID of the source connection * @payload_type: Payload type (KDBUS_PAYLOAD_*) - * @cookie: Userspace-supplied cookie - * @cookie_reply: For kernel-generated messages, this is the cookie - * the message is a reply to + * @cookie: Userspace-supplied cookie to uniquely identify a + * message, unsually all messages carry this + * @cookie_reply: A reply to the message with the same cookie. The + * reply itself has its own unique cookie, @cookie_reply + * connects the reply to the request message. * @timeout_ns: For non-kernel-generated messages, this denotes the * message timeout in nanoseconds. A message has to be * received with KDBUS_CMD_MSG_RECV by the destination @@ -365,10 +368,8 @@ struct kdbus_msg { __u64 src_id; __u64 payload_type; __u64 cookie; - union { - __u64 cookie_reply; - __u64 timeout_ns; - }; + __u64 cookie_reply; + __u64 timeout_ns; struct kdbus_item items[0]; } __attribute__((aligned(8))); @@ -528,8 +529,9 @@ enum kdbus_name_flags { * struct kdbus_cmd_name - struct to describe a well-known name * @size: The total size of the struct * @flags: Flags for a name entry (KDBUS_NAME_*) - * @owner_id: Privileged users may use this field to (de)register - * names on behalf of other peers. + * @owner_id: The current owner of the name. For requests, + * privileged users may set this field to + * (de)register names on behalf of other connections. * @conn_flags: The flags of the owning connection (KDBUS_HELLO_*) * @name: The well-known name * @@ -630,9 +632,9 @@ struct kdbus_conn_info { * struct kdbus_cmd_match - struct to add or remove matches * @size: The total size of the struct * @owner_id: Privileged users may (de)register matches on behalf - * of other peers. In other cases, set to 0. + * of other peers * @cookie: Userspace supplied cookie. When removing, the cookie - * identifies the match to remove. + * identifies the match to remove * @items: A list of items for additional information * * This structure is used with the KDBUS_CMD_ADD_MATCH and |