sd_bus_slot_get_bus, sd_bus_slot_get_current_handler, sd_bus_slot_get_current_message, sd_bus_slot_get_current_userdata — Query information attached to a bus slot object
#include <systemd/sd-bus.h>
typedef int (*sd_bus_message_handler_t)( | sd_bus_message *m, |
| void *userdata, | |
sd_bus_error *ret_error); |
sd_bus *sd_bus_slot_get_bus( | sd_bus_slot *slot); |
sd_bus_message_handler_t sd_bus_slot_get_current_handler
( | sd_bus_slot *slot); |
sd_bus_message *sd_bus_slot_get_current_message( | sd_bus_slot *slot); |
void *sd_bus_slot_get_current_userdata( | sd_bus_slot *slot); |
sd_bus_slot_get_bus() returns the bus object that message
slot is attached to.
sd_bus_slot_get_current_handler(),
sd_bus_slot_get_current_message() and
sd_bus_slot_get_current_userdata() return the current handler, message and
userdata respectively of the bus slot is attached to if we're currently
executing the callback associated with slot.
sd_bus_slot_get_bus() always returns the bus object.
On success, sd_bus_slot_get_current_handler(),
sd_bus_slot_get_current_message() and
sd_bus_slot_get_current_userdata() return the requested object. On failure,
they return NULL.
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.