projects / lttng-ust.git / blame
| Commit | Line | Data |
|---|---|---|
| 53569322 | 1 | /* |
| c0c0989a | 2 | * SPDX-License-Identifier: MIT |
| 53569322 | 3 | * |
| c0c0989a | 4 | * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 28b9540b MJ |
5 | * |
| 6 | * The context provider feature is part of the ABI and used by the Java jni | |
| 7 | * interface. This header should be moved to the public header directory once | |
| 8 | * some test code and documentation is written. | |
| 53569322 MD |
9 | */ |
| 10 | ||
| c0c0989a MJ |
11 | #ifndef _LTTNG_UST_CONTEXT_PROVIDER_H |
| 12 | #define _LTTNG_UST_CONTEXT_PROVIDER_H | |
| 13 | ||
| b4051ad8 | 14 | #include <stddef.h> |
| 53569322 MD |
15 | #include <lttng/ust-events.h> |
| 16 | #include <urcu/hlist.h> | |
| 17 | ||
| fa194c41 MJ |
18 | #include "ust-dynamic-type.h" |
| 19 | ||
| 20 | struct lttng_ctx_value { | |
| 21 | enum lttng_ust_dynamic_type sel; | |
| 22 | union { | |
| 23 | int64_t s64; | |
| 24 | uint64_t u64; | |
| 25 | const char *str; | |
| 26 | double d; | |
| 27 | } u; | |
| 28 | }; | |
| 29 | ||
| 30 | struct lttng_perf_counter_field; | |
| 31 | ||
| 32 | #define LTTNG_UST_CTX_FIELD_PADDING 40 | |
| 33 | struct lttng_ctx_field { | |
| 34 | struct lttng_ust_event_field event_field; | |
| 35 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset); | |
| 36 | void (*record)(struct lttng_ctx_field *field, | |
| 37 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
| 38 | struct lttng_channel *chan); | |
| 39 | void (*get_value)(struct lttng_ctx_field *field, | |
| 40 | struct lttng_ctx_value *value); | |
| 41 | union { | |
| 42 | struct lttng_perf_counter_field *perf_counter; | |
| 43 | char padding[LTTNG_UST_CTX_FIELD_PADDING]; | |
| 44 | } u; | |
| 45 | void (*destroy)(struct lttng_ctx_field *field); | |
| 46 | char *field_name; /* Has ownership, dynamically allocated. */ | |
| 47 | }; | |
| 48 | ||
| 49 | #define LTTNG_UST_CTX_PADDING 20 | |
| 50 | struct lttng_ctx { | |
| 51 | struct lttng_ctx_field *fields; | |
| 52 | unsigned int nr_fields; | |
| 53 | unsigned int allocated_fields; | |
| 54 | unsigned int largest_align; | |
| 55 | char padding[LTTNG_UST_CTX_PADDING]; | |
| 56 | }; | |
| 57 | ||
| 53569322 MD |
58 | struct lttng_ust_context_provider { |
| 59 | char *name; | |
| 60 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset); | |
| 61 | void (*record)(struct lttng_ctx_field *field, | |
| 62 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
| 63 | struct lttng_channel *chan); | |
| 64 | void (*get_value)(struct lttng_ctx_field *field, | |
| 65 | struct lttng_ctx_value *value); | |
| 66 | struct cds_hlist_node node; | |
| 67 | }; | |
| 68 | ||
| 69 | int lttng_ust_context_provider_register(struct lttng_ust_context_provider *provider); | |
| 70 | void lttng_ust_context_provider_unregister(struct lttng_ust_context_provider *provider); | |
| 71 | ||
| 53569322 MD |
72 | void lttng_ust_context_set_session_provider(const char *name, |
| 73 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
| 74 | void (*record)(struct lttng_ctx_field *field, | |
| 75 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
| 76 | struct lttng_channel *chan), | |
| 77 | void (*get_value)(struct lttng_ctx_field *field, | |
| 78 | struct lttng_ctx_value *value)); | |
| 79 | ||
| 80 | int lttng_ust_add_app_context_to_ctx_rcu(const char *name, struct lttng_ctx **ctx); | |
| 81 | int lttng_ust_context_set_provider_rcu(struct lttng_ctx **_ctx, | |
| 82 | const char *name, | |
| 83 | size_t (*get_size)(struct lttng_ctx_field *field, size_t offset), | |
| 84 | void (*record)(struct lttng_ctx_field *field, | |
| 85 | struct lttng_ust_lib_ring_buffer_ctx *ctx, | |
| 86 | struct lttng_channel *chan), | |
| 87 | void (*get_value)(struct lttng_ctx_field *field, | |
| 88 | struct lttng_ctx_value *value)); | |
| 53569322 MD |
89 | |
| 90 | #endif /* _LTTNG_UST_CONTEXT_PROVIDER_H */ |