int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd);
int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]);
int sd_bus_set_bus_client(sd_bus *bus, int b);
int sd_bus_set_fd(sd_bus *bus, int input_fd, int output_fd);
int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]);
int sd_bus_set_bus_client(sd_bus *bus, int b);