int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
const int *fds, size_t nb_fd, const void *vardata,
size_t vardata_len, void **user_payload_buf,
int lttng_ctl_ask_sessiond_fds_varlen(struct lttcomm_session_msg *lsm,
const int *fds, size_t nb_fd, const void *vardata,
size_t vardata_len, void **user_payload_buf,