include/lttng/session-internal.hpp

   1 /*
   2  * Copyright (C) 2019 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   3  *
   4  * SPDX-License-Identifier: LGPL-2.1-only
   5  *
   6  */
   7
   8 #ifndef LTTNG_SESSION_INTERNAL_H
   9 #define LTTNG_SESSION_INTERNAL_H
  10
  11 #include <common/buffer-view.hpp>
  12 #include <common/macros.hpp>
  13 #include <common/optional.hpp>
  14 #include <lttng/constant.h>
  15 #include <lttng/lttng-error.h>
  16 #include <lttng/trace-format-descriptor-internal.hpp>
  17
  18 struct lttng_session;
  19 struct lttng_payload_view;
  20
  21 struct lttng_session_extended {
  22         LTTNG_OPTIONAL(uint64_t) creation_time;
  23         /*
  24          * This is done this way to satisfy the API memory restriction for lttng_session on listing.
  25          * The caller must be able to simply call free on the return object and all memory be freed.
  26          */
  27         struct lttng_buffer_view serialized_trace_format_descriptor;
  28 };
  29
  30 struct lttng_session_comm {
  31         uint32_t name_len;
  32         uint32_t path_len;
  33         uint8_t enabled;
  34         uint32_t snapshot_mode;
  35         uint32_t live_timer_interval;
  36         uint32_t trace_format_descriptor_len;
  37         /* lttng_session_extended data */
  38         LTTNG_OPTIONAL(uint64_t) LTTNG_PACKED creation_time;
  39         /*
  40          * Dynamic payload:
  41          *   - name[name_len]
  42          *   - path[path_len]
  43          *   - trace_format_descriptor
  44          */
  45         char payload[];
  46 } LTTNG_PACKED;
  47
  48 int lttng_session_serialize(const struct lttng_session *session, struct lttng_payload *payload);
  49
  50 ssize_t lttng_session_create_from_payload(
  51                 struct lttng_payload_view *view, struct lttng_session **out_session);
  52
  53 enum lttng_error_code lttng_sessions_create_and_flatten_from_payload(
  54                 struct lttng_payload_view *view,
  55                 unsigned int count,
  56                 struct lttng_session **sessions);
  57
  58 #endif /* LTTNG_SESSION_INTERNAL_H */