sd_bus_message_seal - Prepare a D-Bus message for transmission
sd_bus_message_seal() finishes the message m and prepares it for
transmission using sd_bus_send(3). cookie specifies the
identifier used to match the message reply to its corresponding request.
timeout_usec specifies the maximum time in microseconds to wait for a
reply to arrive.
Note that in most scenarios, it's not necessary to call this
function directly. sd_bus_call(3), sd_bus_call_async(3) and
sd_bus_send(3) will seal any given messages if they have not been
On success, this function returns a non-negative integer. On failure, it returns
a negative errno-style error code.
Returned errors may indicate the following problems:
The m parameter is NULL.
The D-Bus message m has open containers.
The D-Bus message m is a reply but its type
signature does not match the return type signature of its corresponding member
in the object vtable.
These APIs are implemented as a shared library, which can be compiled and linked
to with the libsystemd pkg-config(1) file.