Fix trace-collection.h: No such file or directory that build code with libbabeltrace
[babeltrace.git] / include / babeltrace / ctf / events.h
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1#ifndef _BABELTRACE_CTF_EVENTS_H
2#define _BABELTRACE_CTF_EVENTS_H
3
4/*
5 * BabelTrace
6 *
7 * CTF events API
8 *
9 * Copyright 2011-2012 EfficiOS Inc. and Linux Foundation
10 *
11 * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
12 * Julien Desfossez <julien.desfossez@efficios.com>
13 *
14 * Permission is hereby granted, free of charge, to any person obtaining
15 * a copy of this software and associated documentation files (the
16 * "Software"), to deal in the Software without restriction, including
17 * without limitation the rights to use, copy, modify, merge, publish,
18 * distribute, sublicense, and/or sell copies of the Software, and to
19 * permit persons to whom the Software is furnished to do so, subject to
20 * the following conditions:
21 *
22 * The above copyright notice and this permission notice shall be
23 * included in all copies or substantial portions of the Software.
24 */
25
26#include <stdint.h>
e003ab50 27#include <babeltrace/context.h>
03798a93 28#include <babeltrace/clock-types.h>
9843982d 29
9843982d 30struct definition;
c50d2a7a 31struct bt_ctf_event;
e003ab50 32struct bt_ctf_event_decl;
64c2c249 33struct bt_ctf_field_decl;
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34
35/*
36 * the top-level scopes in CTF
37 */
38enum bt_ctf_scope {
39 BT_TRACE_PACKET_HEADER = 0,
40 BT_STREAM_PACKET_CONTEXT = 1,
41 BT_STREAM_EVENT_HEADER = 2,
42 BT_STREAM_EVENT_CONTEXT = 3,
43 BT_EVENT_CONTEXT = 4,
44 BT_EVENT_FIELDS = 5,
45};
46
47/*
48 * the supported CTF types
49 */
50enum ctf_type_id {
51 CTF_TYPE_UNKNOWN = 0,
52 CTF_TYPE_INTEGER,
53 CTF_TYPE_FLOAT,
54 CTF_TYPE_ENUM,
55 CTF_TYPE_STRING,
56 CTF_TYPE_STRUCT,
57 CTF_TYPE_UNTAGGED_VARIANT,
58 CTF_TYPE_VARIANT,
59 CTF_TYPE_ARRAY,
60 CTF_TYPE_SEQUENCE,
61 NR_CTF_TYPES,
62};
63
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64/*
65 * the supported CTF string encodings
66 */
67enum ctf_string_encoding {
68 CTF_STRING_NONE = 0,
69 CTF_STRING_UTF8,
70 CTF_STRING_ASCII,
71 CTF_STRING_UNKNOWN,
72};
73
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74/*
75 * bt_ctf_get_top_level_scope: return a definition of the top-level scope
76 *
77 * Top-level scopes are defined in the bt_ctf_scope enum.
78 * In order to get a field or a field list, the user needs to pass a
79 * scope as argument, this scope can be a top-level scope or a scope
80 * relative to an arbitrary field. This function provides the mapping
81 * between the enum and the actual definition of top-level scopes.
82 * On error return NULL.
83 */
c50d2a7a 84const struct definition *bt_ctf_get_top_level_scope(const struct bt_ctf_event *event,
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85 enum bt_ctf_scope scope);
86
87/*
88 * bt_ctf_event_get_name: returns the name of the event or NULL on error
89 */
c50d2a7a 90const char *bt_ctf_event_name(const struct bt_ctf_event *event);
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91
92/*
d40ee8ec 93 * bt_ctf_get_cycles: returns the timestamp of the event as written
03798a93 94 * in the packet (in cycles) or -1ULL on error.
57f3005e 95 */
d40ee8ec 96uint64_t bt_ctf_get_cycles(const struct bt_ctf_event *event);
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97
98/*
d40ee8ec 99 * bt_ctf_get_timestamp: returns the timestamp of the event offsetted
03798a93 100 * with the system clock source (in ns) or -1ULL on error
9843982d 101 */
d40ee8ec 102uint64_t bt_ctf_get_timestamp(const struct bt_ctf_event *event);
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103
104/*
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105 * bt_ctf_get_field_list: set list pointer to an array of definition
106 * pointers and set count to the number of elements in the array.
107 * Return 0 on success and a negative value on error.
9843982d 108 */
c50d2a7a 109int bt_ctf_get_field_list(const struct bt_ctf_event *event,
04ae3991 110 const struct definition *scope,
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111 struct definition const * const **list,
112 unsigned int *count);
113
114/*
115 * bt_ctf_get_field: returns the definition of a specific field
116 */
c50d2a7a 117const struct definition *bt_ctf_get_field(const struct bt_ctf_event *event,
04ae3991 118 const struct definition *scope,
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119 const char *field);
120
121/*
122 * bt_ctf_get_index: if the field is an array or a sequence, return the element
123 * at position index, otherwise return NULL;
124 */
c50d2a7a 125const struct definition *bt_ctf_get_index(const struct bt_ctf_event *event,
04ae3991 126 const struct definition *field,
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127 unsigned int index);
128
129/*
130 * bt_ctf_field_name: returns the name of a field or NULL on error
131 */
132const char *bt_ctf_field_name(const struct definition *def);
133
134/*
135 * bt_ctf_field_type: returns the type of a field or -1 if unknown
136 */
da320b83 137enum ctf_type_id bt_ctf_field_type(const struct definition *def);
9843982d 138
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139/*
140 * bt_ctf_get_int_signedness: return the signedness of an integer
141 *
142 * return 0 if unsigned
143 * return 1 if signed
144 * return -1 on error
145 */
146int bt_ctf_get_int_signedness(const struct definition *field);
147
148/*
149 * bt_ctf_get_int_base: return the base of an int or a negative value on error
150 */
151int bt_ctf_get_int_base(const struct definition *field);
152
153/*
154 * bt_ctf_get_int_byte_order: return the byte order of an int or a negative
155 * value on error
156 */
157int bt_ctf_get_int_byte_order(const struct definition *field);
158
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159/*
160 * bt_ctf_get_int_len: return the size, in bits, of an int or a negative
161 * value on error
162 */
163ssize_t bt_ctf_get_int_len(const struct definition *field);
164
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165/*
166 * bt_ctf_get_encoding: return the encoding of an int or a string.
167 * return a negative value on error
168 */
169enum ctf_string_encoding bt_ctf_get_encoding(const struct definition *field);
170
171/*
172 * bt_ctf_get_array_len: return the len of an array or a negative
173 * value on error
174 */
175int bt_ctf_get_array_len(const struct definition *field);
176
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177/*
178 * Field access functions
179 *
180 * These functions return the value associated with the field passed in
181 * parameter.
182 *
183 * If the field does not exist or is not of the type requested, the value
184 * returned is undefined. To check if an error occured, use the
b330165c 185 * bt_ctf_field_get_error() function after accessing a field.
9843982d 186 */
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187uint64_t bt_ctf_get_uint64(const struct definition *field);
188int64_t bt_ctf_get_int64(const struct definition *field);
189char *bt_ctf_get_char_array(const struct definition *field);
190char *bt_ctf_get_string(const struct definition *field);
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191
192/*
b330165c 193 * bt_ctf_field_get_error: returns the last error code encountered while
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194 * accessing a field and reset the error flag.
195 * Return 0 if no error, a negative value otherwise.
196 */
197int bt_ctf_field_get_error(void);
198
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199/*
200 * bt_ctf_get_event_decl_list: set list pointer to an array of bt_ctf_event_decl
201 * pointers and set count to the number of elements in the array.
202 *
203 * Return 0 on success and a negative value on error.
204 */
205int bt_ctf_get_event_decl_list(int handle_id, struct bt_context *ctx,
64c2c249 206 struct bt_ctf_event_decl * const **list,
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207 unsigned int *count);
208
209/*
210 * bt_ctf_get_decl_event_name: return the name of the event or NULL on error
211 */
212const char *bt_ctf_get_decl_event_name(const struct bt_ctf_event_decl *event);
213
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214/*
215 * bt_ctf_get_decl_fields: set list pointer to an array of bt_ctf_field_decl
216 * pointers and set count to the number of elements in the array.
217 *
218 * Returns 0 on success and a negative value on error
219 */
220int bt_ctf_get_decl_fields(struct bt_ctf_event_decl *event_decl,
221 enum bt_ctf_scope scope,
222 struct bt_ctf_field_decl const * const **list,
223 unsigned int *count);
224
225/*
226 * bt_ctf_get_decl_field_name: return the name of a field decl or NULL on error
227 */
228const char *bt_ctf_get_decl_field_name(const struct bt_ctf_field_decl *field);
229
9843982d 230#endif /* _BABELTRACE_CTF_EVENTS_H */
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