int sd_bus_set_address(sd_bus *bus, const char *address);
int sd_bus_set_fd(sd_bus *bus, int fd);
int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]);
int sd_bus_set_address(sd_bus *bus, const char *address);
int sd_bus_set_fd(sd_bus *bus, int fd);
int sd_bus_set_exec(sd_bus *bus, const char *path, char *const argv[]);