sd_bus_get_current_handler - Man Page

#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);

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​.

On success, these functions 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​.

All functions listed here are thread-agnostic and only a single thread may operate on a given object at any given time​. Different threads may access the same object at different times​. Multiple independent objects may be used from different threads in parallel​.

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​.

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​.

systemd(1), sd-bus(3)