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 <systemd/sd-bus.h>

       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 246.

SEE ALSO

       systemd(1), sd-bus(3)