sd_bus_slot_get_bus, sd_bus_slot_get_current_handler, sd_bus_slot_get_current_message,

Description

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.

History

sd_bus_slot_get_bus(), sd_bus_slot_get_current_handler(), sd_bus_slot_get_current_message(), and sd_bus_slot_get_current_userdata() were added in version 246.

Name

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

Notes

Functions described here are available as a shared library, which can be compiled against and linked to with the libsystemdpkg-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.

Return Value

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.

Synopsis

#include<systemd/sd-bus.h>typedefint(*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_tsd_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);