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 "lttng/lttng-error.h"
  12 #include "lttng/tracker.h"
  13 #include "session.h"
  14 #include "snapshot.h"
  15 #include "trace-kernel.h"
  16
  17 /*
  18  * Default size for the event list when kernel_list_events is called. This size
  19  * value is based on the initial LTTng 2.0 version set of tracepoints.
  20  *
  21  * This is NOT an upper bound because if the real event list size is bigger,
  22  * dynamic reallocation is performed.
  23  */
  24 #define KERNEL_EVENT_INIT_LIST_SIZE 64
  25
  26 int kernel_add_channel_context(struct ltt_kernel_channel *chan,
  27                 struct ltt_kernel_context *ctx);
  28 int kernel_create_session(struct ltt_session *session);
  29 int kernel_create_channel(struct ltt_kernel_session *session,
  30                 struct lttng_channel *chan);
  31 int kernel_create_event(struct lttng_event *ev, struct ltt_kernel_channel *channel,
  32                 char *filter_expression, struct lttng_filter_bytecode *filter);
  33 int kernel_disable_channel(struct ltt_kernel_channel *chan);
  34 int kernel_disable_event(struct ltt_kernel_event *event);
  35 int kernel_enable_event(struct ltt_kernel_event *event);
  36 int kernel_enable_channel(struct ltt_kernel_channel *chan);
  37 enum lttng_error_code kernel_process_attr_tracker_set_tracking_policy(
  38                 struct ltt_kernel_session *session,
  39                 enum lttng_process_attr process_attr,
  40                 enum lttng_tracking_policy policy);
  41 enum lttng_error_code kernel_process_attr_tracker_inclusion_set_add_value(
  42                 struct ltt_kernel_session *session,
  43                 enum lttng_process_attr process_attr,
  44                 const struct process_attr_value *value);
  45 enum lttng_error_code kernel_process_attr_tracker_inclusion_set_remove_value(
  46                 struct ltt_kernel_session *session,
  47                 enum lttng_process_attr process_attr,
  48                 const struct process_attr_value *value);
  49 const struct process_attr_tracker *kernel_get_process_attr_tracker(
  50                 struct ltt_kernel_session *session,
  51                 enum lttng_process_attr process_attr);
  52 int kernel_open_metadata(struct ltt_kernel_session *session);
  53 int kernel_open_metadata_stream(struct ltt_kernel_session *session);
  54 int kernel_open_channel_stream(struct ltt_kernel_channel *channel);
  55 int kernel_flush_buffer(struct ltt_kernel_channel *channel);
  56 int kernel_metadata_flush_buffer(int fd);
  57 int kernel_start_session(struct ltt_kernel_session *session);
  58 int kernel_stop_session(struct ltt_kernel_session *session);
  59 ssize_t kernel_list_events(struct lttng_event **event_list);
  60 void kernel_wait_quiescent(void);
  61 int kernel_validate_version(struct lttng_kernel_tracer_version *kernel_tracer_version,
  62                 struct lttng_kernel_tracer_abi_version *kernel_tracer_abi_version);
  63 void kernel_destroy_session(struct ltt_kernel_session *ksess);
  64 void kernel_free_session(struct ltt_kernel_session *ksess);
  65 void kernel_destroy_channel(struct ltt_kernel_channel *kchan);
  66 enum lttng_error_code kernel_snapshot_record(
  67                 struct ltt_kernel_session *ksess,
  68                 const struct consumer_output *output, int wait,
  69                 uint64_t nb_packets_per_stream);
  70 int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits);
  71 enum lttng_error_code kernel_rotate_session(struct ltt_session *session);
  72 enum lttng_error_code kernel_clear_session(struct ltt_session *session);
  73
  74 int init_kernel_workarounds(void);
  75 int kernel_supports_ring_buffer_snapshot_sample_positions(void);
  76 int kernel_supports_ring_buffer_packet_sequence_number(void);
  77 int init_kernel_tracer(void);
  78 void cleanup_kernel_tracer(void);
  79 bool kernel_tracer_is_initialized(void);
  80
  81 enum lttng_error_code kernel_create_channel_subdirectories(
  82                 const struct ltt_kernel_session *ksess);
  83
  84 #endif /* _LTT_KERNEL_CTL_H */