задайте или запросите описание объектов слота шины (Set or query the description of bus slot objects)
Имя (Name)
sd_bus_slot_set_description, sd_bus_slot_get_description - Set or
query the description of bus slot objects
Синопсис (Synopsis)
#include <systemd/sd-bus.h>
int sd_bus_slot_set_description(sd_bus_slot* slot,
const char *description);
int sd_bus_slot_get_description(sd_bus_slot* bus,
const char **description);
Описание (Description)
sd_bus_slot_set_description() sets the description string that is
used in logging to the specified string. The string is copied
internally and freed when the bus slot object is deallocated. The
description argument may be NULL, in which case the description
is unset.
sd_bus_slot_get_description() returns a description string in
description. If the string is not set, e.g. with
sd_bus_slot_set_description(), and the slot is a bus match
callback slot, the match string will be returned. Otherwise,
-ENXIO is returned.
Возвращаемое значение (Return value)
On success, these functions return 0 or a positive integer. On
failure, they return a negative errno-style error code.
Errors
Returned errors may indicate the following problems:
-EINVAL
An required argument is NULL.
-ENXIO
The bus slot object has no description.
-ENOMEM
Memory allocation failed.
Примечание (Note)
These APIs are implemented as a shared library, which can be
compiled and linked to with the libsystemd pkg-config(1) file.
Смотри также (See also)
systemd(1), sd-bus(3) sd_bus_slot_ref(3),
sd_bus_slot_set_userdata(3)
