Index · Directives systemd 255


sd_bus_list_names — Retrieve information about registered names on a bus


#include <systemd/sd-bus.h>
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.

Return Value

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.

Added in version 246.


The bus cannot be resolved.

Added in version 246.


The bus was created in a different process, library or module instance.

Added in version 246.


Memory allocation failed.

Added in version 246.


The bus is not connected.

Added in version 246.


Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemd pkg-config(1) file.

The code described here uses getenv(3), which is declared to be not multi-thread-safe. This means that the code calling the functions described here must not call setenv(3) from a parallel thread. It is recommended to only do calls to setenv() from an early phase of the program when no other threads have been started.


sd_bus_list_names() was added in version 246.

See Also

systemd(1), sd-bus(3)