SD_BUS_SLOT_SET_DESTROYsd_bus_slot_set_destSD_BUS_SLOT_SET_DESTROY_CALLBACK(3)

NAME
       sd_bus_slot_set_destroy_callback, sd_bus_slot_get_destroy_callback,
       sd_bus_track_set_destroy_callback, sd_bus_track_get_destroy_callback,
       sd_bus_destroy_t - Define the callback function for resource cleanup

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

       typedef int (*sd_bus_destroy_t)(void *userdata);

       int sd_bus_slot_set_destroy_callback(sd_bus_slot *slot,
                                            sd_bus_destroy_t callback);

       int sd_bus_slot_get_destroy_callback(sd_bus_slot *slot,
                                            sd_bus_destroy_t *callback);

       int sd_bus_track_set_destroy_callback(sd_bus_track *track,
                                             sd_bus_destroy_t callback);

       int sd_bus_track_get_destroy_callback(sd_bus_track *track,
                                             sd_bus_destroy_t *callback);

DESCRIPTION
       sd_bus_slot_set_destroy_callback() sets callback as the callback
       function to be called right before the bus slot object slot is
       deallocated. The userdata pointer from the slot object will be passed
       as the userdata parameter. This pointer can be set by an argument to
       the constructor functions, see sd_bus_add_match(3), or directly, see
       sd_bus_slot_set_userdata(3). This callback function is called even if
       userdata is NULL. Note that this callback is invoked at a time where
       the bus slot object itself is already invalidated, and executing
       operations or taking new references to the bus slot object is not
       permissible.

       sd_bus_slot_get_destroy_callback() returns the current callback for
       slot in the callback parameter.

       sd_bus_track_set_destroy_callback() and
       sd_bus_track_get_destroy_callback() provide equivalent functionality
       for the userdata pointer associated with bus peer tracking objects. For
       details about bus peer tracking objects, see sd_bus_track_new(3).

RETURN VALUE
       On success, sd_bus_slot_set_destroy_callback() and
       sd_bus_track_set_destroy_callback() return 0 or a positive integer. On
       failure, they return a negative errno-style error code.

       sd_bus_slot_get_destroy_callback() and
       sd_bus_track_get_destroy_callback() return positive if the destroy
       callback function is set, 0 if not. On failure, they return a negative
       errno-style error code.

   Errors
       Returned errors may indicate the following problems:

       -EINVAL
           The slot or track parameter is NULL.

NOTES
       These APIs are implemented as a shared library, which can be compiled
       and linked to with the libsystemd pkg-config(1) file.

SEE ALSO
       systemd(1), sd-bus(3), sd_bus_slot_set_floating(3),
       sd_bus_add_match(3), sd_bus_track_new(3), sd_bus_slot_set_userdata(3),
       sd_bus_track_set_userdata(3)

systemd 252                                SD_BUS_SLOT_SET_DESTROY_CALLBACK(3)

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