sd_bus_slot_set_description

systemd
sd_bus_slot_set_description 3
sd_bus_slot_set_description sd_bus_slot_get_description Set or query the description of bus slot objects

    #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

## 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.

## 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.

## See Also

systemd 1, sd-bus 3 sd_bus_slot_ref 3, sd_bus_slot_set_userdata 3