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sd_bus_list_names - Man Page

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[1] to retrieve the list of currently-owned names on the bus. If acquired is not NULL, the function calls org.freedesktop.DBus.ListActivableNames[2] 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.


The bus cannot be resolved.


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


Memory allocation failed.


The bus is not connected.


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 221.

See Also

systemd(1), sd-bus(3)


  1. org.freedesktop.DBus.ListNames
  2. org.freedesktop.DBus.ListActivableNames

Referenced By

sd-bus(3), systemd.directives(7), systemd.index(7).

systemd 256.2