sd_bus_message_get_cookie, sd_bus_message_get_reply_cookie — Returns the transaction cookie of a message
the transaction cookie of a message. The cookie
uniquely identifies a message within each bus peer,
but is not globally unique. It is assigned when a
message is sent.
returns the transaction cookie of the message the
specified message is a response to. When a reply
message is generated for a method call message, its
cookie is copied over into this field. Note that while
every message that is transferred is identified by a
cookie, only response messages carry a reply cookie
Both functions take a message object as first parameter and a place to store the 64-bit cookie in.
On success, these calls return 0 or a positive integer. On failure, these calls return a negative errno-style error code.
On success, the cookie/reply cookie is returned in the specified 64-bit unsigned integer variable.
Returned errors may indicate the following problems:
interfaces are available as a shared library, which can
be compiled and linked to with the