sd_bus_message_get_signature, sd_bus_message_is_empty, sd_bus_message_has_signature — Query bus message signature
|const char *signature|
sd_bus_message_get_signature() returns the signature of message
complete is true, the signature of the
whole message is returned, and just the signature of the currently open container otherwise.
sd_bus_message_is_empty() returns true if the message is empty,
i.e. when its signature is empty.
sd_bus_message_has_signature() returns true if the signature of the
message matches given
signature may be
NULL, this is treated the same as
an empty string, which is equivalent to calling
the signature, and
NULL on error.
The other functions return 0 or a positive integer on success. On failure, they return a negative errno-style error code.
Functions described here are available as a shared
library, which can be compiled against and linked to with the
The code described here uses
which is declared to be not multi-thread-safe. This means that the code calling the functions described
here must not call
from a parallel thread. It is recommended to only do calls to
from an early phase of the program when no other threads have been started.
sd_bus_message_has_signature() were added in version 240.