-int lttng_ctl_ask_sessiond_varlen(struct lttcomm_session_msg *lsm,
- void *vardata, size_t varlen, void **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, void **user_cmd_header_buf,
+ size_t *user_cmd_header_len);
+
+/*
+ * Sends the lttcomm message to the session daemon and fills the reply payload.
+ *
+ * Return the size of the received data on success or else a negative lttng
+ * error code.
+ */
+LTTNG_HIDDEN
+int lttng_ctl_ask_sessiond_payload(struct lttng_payload_view *message,
+ struct lttng_payload *reply);
+
+/*
+ * Calls lttng_ctl_ask_sessiond_fds_varlen() with no expected command header.
+ */
+static inline int lttng_ctl_ask_sessiond_varlen_no_cmd_header(
+ struct lttcomm_session_msg *lsm,
+ const void *vardata,
+ size_t vardata_len,
+ void **user_payload_buf)
+{
+ return lttng_ctl_ask_sessiond_fds_varlen(lsm, NULL, 0, vardata,
+ vardata_len, user_payload_buf, NULL, NULL);
+}