int sd_bus_negotiate_fds(sd_bus *bus, int b);
int sd_bus_negotiate_attach_timestamp(sd_bus *bus, int b);
int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t creds_mask);
int sd_bus_start(sd_bus *ret);
int sd_bus_negotiate_fds(sd_bus *bus, int b);
int sd_bus_negotiate_attach_timestamp(sd_bus *bus, int b);
int sd_bus_negotiate_attach_creds(sd_bus *bus, uint64_t creds_mask);
int sd_bus_start(sd_bus *ret);