src/bin/lttng-sessiond/kernel.h

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #ifndef _LTT_KERNEL_CTL_H
   9 #define _LTT_KERNEL_CTL_H
  10
  11 #include "session.h"
  12 #include "snapshot.h"
  13 #include "trace-kernel.h"
  14
  15 /*
  16  * Default size for the event list when kernel_list_events is called. This size
  17  * value is based on the initial LTTng 2.0 version set of tracepoints.
  18  *
  19  * This is NOT an upper bound because if the real event list size is bigger,
  20  * dynamic reallocation is performed.
  21  */
  22 #define KERNEL_EVENT_INIT_LIST_SIZE 64
  23 #define KERNEL_TRACKER_IDS_INIT_LIST_SIZE 64
  24
  25 int kernel_add_channel_context(struct ltt_kernel_channel *chan,
  26                 struct ltt_kernel_context *ctx);
  27 int kernel_create_session(struct ltt_session *session);
  28 int kernel_create_channel(struct ltt_kernel_session *session,
  29                 struct lttng_channel *chan);
  30 int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *channel,
  31                 char *filter_expression, struct lttng_filter_bytecode *filter);
  32 int kernel_disable_channel(struct ltt_kernel_channel *chan);
  33 int kernel_disable_event(struct ltt_kernel_event *event);
  34 int kernel_enable_event(struct ltt_kernel_event *event);
  35 int kernel_enable_channel(struct ltt_kernel_channel *chan);
  36 int kernel_track_id(enum lttng_tracker_type tracker_type,
  37                 struct ltt_kernel_session *session,
  38                 const struct lttng_tracker_id *id);
  39 int kernel_untrack_id(enum lttng_tracker_type tracker_type,
  40                 struct ltt_kernel_session *session,
  41                 const struct lttng_tracker_id *id);
  42 int kernel_open_metadata(struct ltt_kernel_session *session);
  43 int kernel_open_metadata_stream(struct ltt_kernel_session *session);
  44 int kernel_open_channel_stream(struct ltt_kernel_channel *channel);
  45 int kernel_flush_buffer(struct ltt_kernel_channel *channel);
  46 int kernel_metadata_flush_buffer(int fd);
  47 int kernel_start_session(struct ltt_kernel_session *session);
  48 int kernel_stop_session(struct ltt_kernel_session *session);
  49 ssize_t kernel_list_events(struct lttng_event **event_list);
  50 void kernel_wait_quiescent(void);
  51 int kernel_validate_version(struct lttng_kernel_tracer_version *kernel_tracer_version,
  52                 struct lttng_kernel_tracer_abi_version *kernel_tracer_abi_version);
  53 void kernel_destroy_session(struct ltt_kernel_session *ksess);
  54 void kernel_free_session(struct ltt_kernel_session *ksess);
  55 void kernel_destroy_channel(struct ltt_kernel_channel *kchan);
  56 enum lttng_error_code kernel_snapshot_record(
  57                 struct ltt_kernel_session *ksess,
  58                 const struct consumer_output *output, int wait,
  59                 uint64_t nb_packets_per_stream);
  60 int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits);
  61 enum lttng_error_code kernel_rotate_session(struct ltt_session *session);
  62 enum lttng_error_code kernel_clear_session(struct ltt_session *session);
  63
  64 int init_kernel_workarounds(void);
  65 int kernel_list_tracker_ids(enum lttng_tracker_type tracker_type,
  66                 struct ltt_kernel_session *session,
  67                 struct lttng_tracker_ids **ids);
  68 int kernel_supports_ring_buffer_snapshot_sample_positions(void);
  69 int kernel_supports_ring_buffer_packet_sequence_number(void);
  70 int init_kernel_tracer(void);
  71 void cleanup_kernel_tracer(void);
  72 bool kernel_tracer_is_initialized(void);
  73
  74 enum lttng_error_code kernel_create_channel_subdirectories(
  75                 const struct ltt_kernel_session *ksess);
  76
  77 enum lttng_error_code kernel_create_trigger_group_notification_fd(
  78                 int *trigger_group_notification_fd);
  79 enum lttng_error_code kernel_destroy_trigger_group_notification_fd(
  80                 int trigger_group_notification_fd);
  81 enum lttng_error_code kernel_update_tokens(void);
  82 int kernel_get_notification_fd(void);
  83
  84 #endif /* _LTT_KERNEL_CTL_H */