SD_BUS_SLOT_GET_BUS(3) sd_bus_slot_get_bus SD_BUS_SLOT_GET_BUS(3)
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.
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Pages that refer to this page: sd-bus(3), sd_bus_slot_set_userdata(3), systemd.directives(7), systemd.index(7)