sd_bus_list_names - Retrieve information about registered names on a bus
int sd_bus_list_names(sd_bus *bus, char ***acquired, char ***activatable);
sd_bus_list_names() retrieves information about the registered names on a bus. If acquired is not NULL, this function calls org.freedesktop.DBus.ListNames  to retrieve the list of currently-owned names on the bus. If acquired is not NULL, the function calls org.freedesktop.DBus.ListActivableNames  to retrieve the list of all names on the bus that can be activated. Note that ownership of the arrays returned by sd_bus_list_names() in acquired and activatable is transferred to the caller and hence, the caller is responsible for freeing these arrays and their contents.
On success, sd_bus_list_names() returns a non-negative integer. On failure, it returns a negative errno-style error code.
Returned errors may indicate the following problems:
bus or both acquired and activatable were NULL.
The bus cannot be resolved.
The bus was created in a different process.
Memory allocation failed.
The bus is not connected.
These APIs are implemented as a shared library, which can be compiled and linked to with the libsystemd pkg-config(1) file.