SD_BUS_GET_CURRENT_HANDLER(3) sd_bus_get_current_handler NAME sd_bus_get_current_handler, sd_bus_get_current_message, sd_bus_get_current_slot, sd_bus_get_current_userdata - Query information of the callback a bus object is currently running SYNOPSIS #include typedef int (*sd_bus_message_handler_t)(sd_bus_message *m, void *userdata, sd_bus_error *ret_error); sd_bus_message_handler_t sd_bus_get_current_handler(sd_bus *bus); sd_bus_message* sd_bus_get_current_message(sd_bus *bus); sd_bus_slot* sd_bus_get_current_slot(sd_bus *bus); void* sd_bus_get_current_userdata(sd_bus *bus); DESCRIPTION Whenever sd-bus is about to invoke a user-supplied callback function, it stores the current callback, D-Bus message, slot and userdata pointer and allows these to be queried via sd_bus_get_current_handler(), sd_bus_get_current_message(), sd_bus_get_current_slot() and sd_bus_get_current_userdata(), respectively. If bus cannot be resolved or if execution does not reside in a user-supplied callback of bus, these functions return NULL. RETURN VALUE On success, these functions return the requested object. On failure, they return NULL. NOTES 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. HISTORY sd_bus_get_current_handler(), sd_bus_get_current_message(), sd_bus_get_current_slot(), and sd_bus_get_current_userdata() were added in version 221. SEE ALSO systemd(1), sd-bus(3) systemd 256.8 SD_BUS_GET_CURRENT_HANDLER(3)