+static enum lttng_error_code receive_lttng_trigger(struct command_ctx *cmd_ctx,
+ int sock,
+ int *sock_error,
+ struct lttng_trigger **_trigger)
+{
+ int ret;
+ size_t trigger_len;
+ ssize_t sock_recv_len;
+ enum lttng_error_code ret_code;
+ struct lttng_payload trigger_payload;
+ struct lttng_trigger *trigger;
+
+ lttng_payload_init(&trigger_payload);
+ trigger_len = (size_t) cmd_ctx->lsm.u.trigger.length;
+ ret = lttng_dynamic_buffer_set_size(
+ &trigger_payload.buffer, trigger_len);
+ if (ret) {
+ ret_code = LTTNG_ERR_NOMEM;
+ goto end;
+ }
+
+ sock_recv_len = lttcomm_recv_unix_sock(
+ sock, trigger_payload.buffer.data, trigger_len);
+ if (sock_recv_len < 0 || sock_recv_len != trigger_len) {
+ ERR("Failed to receive trigger in command payload");
+ *sock_error = 1;
+ ret_code = LTTNG_ERR_INVALID_PROTOCOL;
+ goto end;
+ }
+
+ /* Receive fds, if any. */
+ if (cmd_ctx->lsm.fd_count > 0) {
+ sock_recv_len = lttcomm_recv_payload_fds_unix_sock(
+ sock, cmd_ctx->lsm.fd_count, &trigger_payload);
+ if (sock_recv_len > 0 &&
+ sock_recv_len != cmd_ctx->lsm.fd_count * sizeof(int)) {
+ ERR("Failed to receive all file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
+ cmd_ctx->lsm.fd_count, (int) ret);
+ ret_code = LTTNG_ERR_INVALID_PROTOCOL;
+ *sock_error = 1;
+ goto end;
+ } else if (sock_recv_len <= 0) {
+ ERR("Failed to receive file descriptors for trigger in command payload: expected fd count = %u, ret = %d",
+ cmd_ctx->lsm.fd_count, (int) ret);
+ ret_code = LTTNG_ERR_FATAL;
+ *sock_error = 1;
+ goto end;
+ }
+ }
+
+ /* Deserialize trigger. */
+ {
+ struct lttng_payload_view view =
+ lttng_payload_view_from_payload(
+ &trigger_payload, 0, -1);
+
+ if (lttng_trigger_create_from_payload(&view, &trigger) !=
+ trigger_len) {
+ ERR("Invalid trigger received as part of command payload");
+ ret_code = LTTNG_ERR_INVALID_TRIGGER;
+ goto end;
+ }
+ }
+
+ *_trigger = trigger;
+ ret_code = LTTNG_OK;
+
+end:
+ return ret_code;
+}
+