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349951ea PP |
1 | --- |
2 | id: lttng-modules-tp-fields | |
799746ab | 3 | since: 2.7 |
cda9ab84 PP |
4 | since-note: | |
5 | Previous versions used the TP_STRUCT__entry() and TP_fast_assign() | |
6 | macros which also used different inner macros. The new ctf_*() | |
7 | macros are similar to their LTTng-UST counterpart. | |
349951ea PP |
8 | --- |
9 | ||
10 | <a name="doc-lttng-modules-tp-fast-assign"></a> | |
11 | <a name="doc-lttng-modules-tp-struct-entry"></a> | |
12 | The available macros to define tracepoint fields, which should be listed | |
13 | within `TP_FIELDS()` in `LTTNG_TRACEPOINT_EVENT()`, are: | |
14 | ||
15 | <div class="table"> | |
16 | <table class="func-desc"> | |
17 | <thead> | |
18 | <tr> | |
19 | <th>Macro</th> | |
20 | <th>Description/arguments</th> | |
21 | </tr> | |
22 | </thead> | |
23 | <tbody> | |
24 | <tr> | |
25 | <td> | |
26 | <ul> | |
27 | <li><code class="no-bg">ctf_integer(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
28 | <li><code class="no-bg">ctf_integer_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
29 | <li><code class="no-bg">ctf_user_integer(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
30 | <li><code class="no-bg">ctf_user_integer_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
31 | </ul> | |
32 | </td> | |
33 | <td> | |
34 | <p>Standard integer, displayed in base 10</p> | |
35 | <ul> | |
36 | <li> | |
37 | <code class="arg"><strong>t</strong></code> integer C type | |
38 | (<code>int</code>, <code>long</code>, | |
39 | <code>size_t</code>, ...) | |
40 | </li> | |
41 | <li><code class="arg"><strong>n</strong></code> field name</li> | |
42 | <li><code class="arg"><strong>e</strong></code> argument expression</li> | |
43 | </ul> | |
44 | </td> | |
45 | </tr> | |
46 | <tr> | |
47 | <td> | |
48 | <ul> | |
49 | <li><code class="no-bg">ctf_integer_hex(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
50 | <li><code class="no-bg">ctf_user_integer_hex(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
51 | </ul> | |
52 | </td> | |
53 | <td> | |
54 | <p>Standard integer, displayed in base 16</p> | |
55 | <ul> | |
56 | <li><code class="arg"><strong>t</strong></code> integer C type</li> | |
57 | <li><code class="arg">n</code> field name</li> | |
58 | <li><code class="arg">e</code> argument expression</li> | |
59 | </ul> | |
60 | </td> | |
61 | </tr> | |
62 | <tr> | |
63 | <td><code class="no-bg">ctf_integer_oct(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></td> | |
64 | <td> | |
65 | <p>Standard integer, displayed in base 8</p> | |
66 | <ul> | |
67 | <li><code class="arg"><strong>t</strong></code> integer C type</li> | |
68 | <li><code class="arg">n</code> field name</li> | |
69 | <li><code class="arg">e</code> argument expression</li> | |
70 | </ul> | |
71 | </td> | |
72 | </tr> | |
73 | <tr> | |
74 | <td> | |
75 | <ul> | |
76 | <li><code class="no-bg">ctf_integer_network(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
77 | <li><code class="no-bg">ctf_user_integer_network(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
78 | </ul> | |
79 | </td> | |
80 | <td> | |
81 | <p> | |
82 | Integer in network byte order (big-endian), | |
83 | displayed in base 10 | |
84 | </p> | |
85 | <ul> | |
86 | <li><code class="arg">t</code> integer C type</li> | |
87 | <li><code class="arg">n</code> field name</li> | |
88 | <li><code class="arg">e</code> argument expression</li> | |
89 | </ul> | |
90 | </td> | |
91 | </tr> | |
92 | <tr> | |
93 | <td> | |
94 | <ul> | |
95 | <li><code class="no-bg">ctf_integer_network_hex(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
96 | <li><code class="no-bg">ctf_user_integer_network_hex(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
97 | </ul> | |
98 | </td> | |
99 | <td> | |
100 | <p> | |
101 | Integer in network byte order, displayed | |
102 | in base 16</p> | |
103 | <ul> | |
104 | <li><code class="arg">t</code> integer C type</li> | |
105 | <li><code class="arg">n</code> field name</li> | |
106 | <li><code class="arg">e</code> argument expression</li> | |
107 | </ul> | |
108 | </td> | |
109 | </tr> | |
110 | <tr> | |
111 | <td> | |
112 | <ul> | |
113 | <li><code class="no-bg">ctf_float(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
114 | <li><code class="no-bg">ctf_user_float(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
115 | <li><code class="no-bg">ctf_float_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
116 | <li><code class="no-bg">ctf_user_float_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
117 | </ul> | |
118 | </td> | |
119 | <td> | |
120 | <p>Floating point number</p> | |
121 | <ul> | |
122 | <li> | |
123 | <code class="arg">t</code> floating point number | |
124 | C type (<code>float</code>, <code>double</code>) | |
125 | </li> | |
126 | <li><code class="arg">n</code> field name</li> | |
127 | <li><code class="arg">e</code> argument expression</li> | |
128 | </ul> | |
129 | </td> | |
130 | </tr> | |
131 | <tr> | |
132 | <td> | |
133 | <ul> | |
134 | <li><code class="no-bg">ctf_string(<span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
135 | <li><code class="no-bg">ctf_user_string(<span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
136 | <li><code class="no-bg">ctf_string_nowrite(<span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
137 | <li><code class="no-bg">ctf_user_string_nowrite(<span class="arg">n</span>, <span class="arg">e</span>)</code></li> | |
138 | </ul> | |
139 | </td> | |
140 | <td> | |
141 | <p> | |
142 | Null-terminated string; undefined behavior if | |
143 | <code class="arg">e</code> is <code>NULL</code> | |
144 | </p> | |
145 | <ul> | |
146 | <li><code class="arg">n</code> field name</li> | |
147 | <li><code class="arg">e</code> argument expression</li> | |
148 | </ul> | |
149 | </td> | |
150 | </tr> | |
151 | <tr> | |
152 | <td> | |
153 | <ul> | |
154 | <li><code class="no-bg">ctf_array(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
155 | <li><code class="no-bg">ctf_user_array(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
156 | <li><code class="no-bg">ctf_array_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
157 | <li><code class="no-bg">ctf_user_array_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
158 | </ul> | |
159 | </td> | |
160 | <td> | |
161 | <p> | |
162 | Statically-sized array of integers, displayed in | |
163 | base 10 | |
164 | </p> | |
165 | <ul> | |
166 | <li><code class="arg">t</code> array element C type</li> | |
167 | <li><code class="arg">n</code> field name</li> | |
168 | <li><code class="arg">e</code> argument expression</li> | |
169 | <li><code class="arg">s</code> number of elements</li> | |
170 | </ul> | |
171 | </td> | |
172 | </tr> | |
173 | <tr> | |
174 | <td> | |
175 | <ul> | |
176 | <li><code class="no-bg">ctf_array_text(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
177 | <li><code class="no-bg">ctf_user_array_text(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
178 | <li><code class="no-bg">ctf_array_text_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
179 | <li><code class="no-bg">ctf_user_array_text_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">s</span>)</code></li> | |
180 | </ul> | |
181 | </td> | |
182 | <td> | |
183 | <p> | |
184 | Statically-sized array, printed as text; no need to | |
185 | be null-terminated | |
186 | </p> | |
187 | <ul> | |
188 | <li><code class="arg">t</code> array element C type (always <code>char</code>)</li> | |
189 | <li><code class="arg">n</code> field name</li> | |
190 | <li><code class="arg">e</code> argument expression</li> | |
191 | <li><code class="arg">s</code> number of elements</li> | |
192 | </ul> | |
193 | </td> | |
194 | </tr> | |
195 | <tr> | |
196 | <td> | |
197 | <ul> | |
198 | <li><code class="no-bg">ctf_sequence(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
199 | <li><code class="no-bg">ctf_user_sequence(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
200 | <li><code class="no-bg">ctf_sequence_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
201 | <li><code class="no-bg">ctf_user_sequence_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
202 | </ul> | |
203 | </td> | |
204 | <td> | |
205 | <p> | |
206 | Dynamically-sized array of integers, displayed in | |
207 | base 10; type of | |
208 | <code class="arg">E</code> needs to be unsigned | |
209 | </p> | |
210 | <ul> | |
211 | <li><code class="arg">t</code> sequence element C type</li> | |
212 | <li><code class="arg">n</code> field name</li> | |
213 | <li><code class="arg">e</code> argument expression</li> | |
214 | <li><code class="arg">T</code> length expression C type</li> | |
215 | <li><code class="arg">E</code> length expression</li> | |
216 | </ul> | |
217 | </td> | |
218 | </tr> | |
219 | <tr> | |
220 | <td> | |
221 | <ul> | |
222 | <li><code class="no-bg">ctf_sequence_hex(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
223 | </ul> | |
224 | </td> | |
225 | <td> | |
226 | <p> | |
227 | Dynamically-sized array of integers, displayed in | |
228 | base 16; type of | |
229 | <code class="arg">E</code> needs to be unsigned | |
230 | </p> | |
231 | <ul> | |
232 | <li><code class="arg">t</code> sequence element C type</li> | |
233 | <li><code class="arg">n</code> field name</li> | |
234 | <li><code class="arg">e</code> argument expression</li> | |
235 | <li><code class="arg">T</code> length expression C type</li> | |
236 | <li><code class="arg">E</code> length expression</li> | |
237 | </ul> | |
238 | </td> | |
239 | </tr> | |
240 | <tr> | |
241 | <td> | |
242 | <ul> | |
243 | <li><code class="no-bg">ctf_sequence_network(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
244 | </ul> | |
245 | </td> | |
246 | <td> | |
247 | <p> | |
248 | Dynamically-sized array of integers in network byte | |
249 | order (big endian), displayed in base 10; | |
250 | type of | |
251 | ||
252 | ||
253 | ||
254 | <code class="arg">E</code> needs to be unsigned | |
255 | </p> | |
256 | <ul> | |
257 | <li><code class="arg">t</code> sequence element C type</li> | |
258 | <li><code class="arg">n</code> field name</li> | |
259 | <li><code class="arg">e</code> argument expression</li> | |
260 | <li><code class="arg">T</code> length expression C type</li> | |
261 | <li><code class="arg">E</code> length expression</li> | |
262 | </ul> | |
263 | </td> | |
264 | </tr> | |
265 | <tr> | |
266 | <td> | |
267 | <ul> | |
268 | <li><code class="no-bg">ctf_sequence_text(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
269 | <li><code class="no-bg">ctf_user_sequence_text(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
270 | <li><code class="no-bg">ctf_sequence_text_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
271 | <li><code class="no-bg">ctf_user_sequence_text_nowrite(<span class="arg">t</span>, <span class="arg">n</span>, <span class="arg">e</span>, <span class="arg">T</span>, <span class="arg">E</span>)</code></li> | |
272 | </ul> | |
273 | </td> | |
274 | <td> | |
275 | <p> | |
276 | Dynamically-sized array, displayed as text; no need to | |
277 | be null-terminated; undefined behavior if | |
278 | <code class="arg">e</code> is <code>NULL</code></p> | |
279 | <ul> | |
280 | <li><code class="arg">t</code> sequence element C type (always <code>char</code>)</li> | |
281 | <li><code class="arg">n</code> field name</li> | |
282 | <li><code class="arg">e</code> argument expression</li> | |
283 | <li><code class="arg">T</code> length expression C type</li> | |
284 | <li><code class="arg">E</code> length expression</li> | |
285 | </ul> | |
286 | </td> | |
287 | </tr> | |
288 | </tbody> | |
289 | </table> | |
290 | </div> | |
291 | ||
292 | The `_user` versions must be used when the argument expression, `e`, is | |
293 | a user space address. In the cases of `ctf_user_integer*()` and | |
294 | `ctf_user_float*()`, `&e` must be a user space address, thus `e` must | |
295 | be addressable. | |
296 | ||
297 | The `_nowrite` versions omit themselves from the session trace, but are | |
298 | otherwise identical. This means the `_nowrite` fields won't be written | |
299 | in the recorded trace. Their primary purpose is to make some | |
300 | of the event context available to the | |
301 | [event filters](#doc-enabling-disabling-events) without having to | |
302 | commit the data to sub-buffers. |