Clean-up: sessiond: cmd_enable_channel_internal
[lttng-tools.git] / src / common / event-rule / kernel-syscall.cpp
CommitLineData
e6a39346
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1/*
2 * Copyright (C) 2019 Jonathan Rajotte <jonathan.rajotte-julien@efficios.com>
3 *
4 * SPDX-License-Identifier: LGPL-2.1-only
5 *
6 */
7
58daac01 8#include <common/credentials.h>
e6a39346 9#include <common/error.h>
6a751b95
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10#include <common/hashtable/hashtable.h>
11#include <common/hashtable/utils.h>
e6a39346 12#include <common/macros.h>
6a751b95 13#include <common/mi-lttng.h>
e6a39346 14#include <common/payload-view.h>
6a751b95 15#include <common/payload.h>
e6a39346 16#include <common/runas.h>
40fd2ccf 17#include <common/string-utils/string-utils.h>
e6a39346 18#include <lttng/event-rule/event-rule-internal.h>
4f7da553 19#include <lttng/event-rule/kernel-syscall-internal.h>
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20
21#define IS_SYSCALL_EVENT_RULE(rule) \
4f7da553 22 (lttng_event_rule_get_type(rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL)
e6a39346 23
4f7da553 24static void lttng_event_rule_kernel_syscall_destroy(struct lttng_event_rule *rule)
e6a39346 25{
4f7da553 26 struct lttng_event_rule_kernel_syscall *syscall;
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27
28 if (rule == NULL) {
29 return;
30 }
31
4f7da553 32 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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33
34 free(syscall->pattern);
35 free(syscall->filter_expression);
36 free(syscall->internal_filter.filter);
37 free(syscall->internal_filter.bytecode);
38 free(syscall);
39}
40
4f7da553 41static bool lttng_event_rule_kernel_syscall_validate(
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42 const struct lttng_event_rule *rule)
43{
44 bool valid = false;
4f7da553 45 struct lttng_event_rule_kernel_syscall *syscall;
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46
47 if (!rule) {
48 goto end;
49 }
50
4f7da553 51 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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52
53 /* Required field. */
54 if (!syscall->pattern) {
55 ERR("Invalid syscall event rule: a pattern must be set.");
56 goto end;
57 }
58
59 valid = true;
60end:
61 return valid;
62}
63
4f7da553 64static int lttng_event_rule_kernel_syscall_serialize(
e6a39346
JR
65 const struct lttng_event_rule *rule,
66 struct lttng_payload *payload)
67{
68 int ret;
69 size_t pattern_len, filter_expression_len;
4f7da553
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70 struct lttng_event_rule_kernel_syscall *syscall;
71 struct lttng_event_rule_kernel_syscall_comm syscall_comm;
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72
73 if (!rule || !IS_SYSCALL_EVENT_RULE(rule)) {
74 ret = -1;
75 goto end;
76 }
77
78 DBG("Serializing syscall event rule");
4f7da553 79 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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80
81 pattern_len = strlen(syscall->pattern) + 1;
82
83 if (syscall->filter_expression != NULL) {
84 filter_expression_len = strlen(syscall->filter_expression) + 1;
85 } else {
86 filter_expression_len = 0;
87 }
88
89 syscall_comm.pattern_len = pattern_len;
90 syscall_comm.filter_expression_len = filter_expression_len;
f6a5af19 91 syscall_comm.emission_site = syscall->emission_site;
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92
93 ret = lttng_dynamic_buffer_append(
94 &payload->buffer, &syscall_comm, sizeof(syscall_comm));
95 if (ret) {
96 goto end;
97 }
98
99 ret = lttng_dynamic_buffer_append(
100 &payload->buffer, syscall->pattern, pattern_len);
101 if (ret) {
102 goto end;
103 }
104
105 ret = lttng_dynamic_buffer_append(&payload->buffer,
106 syscall->filter_expression, filter_expression_len);
107end:
108 return ret;
109}
110
4f7da553 111static bool lttng_event_rule_kernel_syscall_is_equal(const struct lttng_event_rule *_a,
e6a39346
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112 const struct lttng_event_rule *_b)
113{
114 bool is_equal = false;
4f7da553 115 struct lttng_event_rule_kernel_syscall *a, *b;
e6a39346 116
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117 a = container_of(_a, struct lttng_event_rule_kernel_syscall, parent);
118 b = container_of(_b, struct lttng_event_rule_kernel_syscall, parent);
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119
120 if (!!a->filter_expression != !!b->filter_expression) {
121 goto end;
122 }
123
a0377dfe
FD
124 LTTNG_ASSERT(a->pattern);
125 LTTNG_ASSERT(b->pattern);
e6a39346
JR
126 if (strcmp(a->pattern, b->pattern)) {
127 goto end;
128 }
129
130 if (a->filter_expression && b->filter_expression) {
131 if (strcmp(a->filter_expression, b->filter_expression)) {
132 goto end;
133 }
134 } else if (!!a->filter_expression != !!b->filter_expression) {
135 /* One is set and not the other. */
136 goto end;
137 }
138
139 is_equal = true;
140end:
141 return is_equal;
142}
143
4f7da553 144static enum lttng_error_code lttng_event_rule_kernel_syscall_generate_filter_bytecode(
58daac01
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145 struct lttng_event_rule *rule,
146 const struct lttng_credentials *creds)
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147{
148 int ret;
149 enum lttng_error_code ret_code = LTTNG_OK;
4f7da553 150 struct lttng_event_rule_kernel_syscall *syscall;
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151 enum lttng_event_rule_status status;
152 const char *filter;
2b00d462 153 struct lttng_bytecode *bytecode = NULL;
e6a39346 154
a0377dfe 155 LTTNG_ASSERT(rule);
e6a39346 156
4f7da553 157 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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158
159 /* Generate the filter bytecode. */
4f7da553 160 status = lttng_event_rule_kernel_syscall_get_filter(rule, &filter);
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161 if (status == LTTNG_EVENT_RULE_STATUS_UNSET) {
162 filter = NULL;
163 } else if (status != LTTNG_EVENT_RULE_STATUS_OK) {
164 ret_code = LTTNG_ERR_FILTER_INVAL;
165 goto end;
166 }
167
168 if (filter && filter[0] == '\0') {
169 ret_code = LTTNG_ERR_FILTER_INVAL;
170 goto end;
171 }
172
173 if (filter == NULL) {
174 /* Nothing to do. */
175 ret = LTTNG_OK;
176 goto end;
177 }
178
179 syscall->internal_filter.filter = strdup(filter);
180 if (syscall->internal_filter.filter == NULL) {
181 ret_code = LTTNG_ERR_NOMEM;
182 goto end;
183 }
184
185 ret = run_as_generate_filter_bytecode(
58daac01 186 syscall->internal_filter.filter, creds, &bytecode);
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187 if (ret) {
188 ret_code = LTTNG_ERR_FILTER_INVAL;
189 }
190
191 syscall->internal_filter.bytecode = bytecode;
192 bytecode = NULL;
193
194end:
195 free(bytecode);
196 return ret_code;
197}
198
4f7da553 199static const char *lttng_event_rule_kernel_syscall_get_internal_filter(
e6a39346
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200 const struct lttng_event_rule *rule)
201{
4f7da553 202 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346 203
a0377dfe 204 LTTNG_ASSERT(rule);
4f7da553 205 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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206
207 return syscall->internal_filter.filter;
208}
209
2b00d462 210static const struct lttng_bytecode *
4f7da553 211lttng_event_rule_kernel_syscall_get_internal_filter_bytecode(
e6a39346
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212 const struct lttng_event_rule *rule)
213{
4f7da553 214 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346 215
a0377dfe 216 LTTNG_ASSERT(rule);
4f7da553 217 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
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218
219 return syscall->internal_filter.bytecode;
220}
221
993578ff 222static enum lttng_event_rule_generate_exclusions_status
f46376a1
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223lttng_event_rule_kernel_syscall_generate_exclusions(
224 const struct lttng_event_rule *rule __attribute__((unused)),
993578ff 225 struct lttng_event_exclusion **exclusions)
e6a39346 226{
993578ff
JR
227 /* Unsupported. */
228 *exclusions = NULL;
229 return LTTNG_EVENT_RULE_GENERATE_EXCLUSIONS_STATUS_NONE;
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230}
231
959e3c66 232static unsigned long
4f7da553 233lttng_event_rule_kernel_syscall_hash(
959e3c66
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234 const struct lttng_event_rule *rule)
235{
236 unsigned long hash;
4f7da553 237 struct lttng_event_rule_kernel_syscall *syscall_rule =
959e3c66
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238 container_of(rule, typeof(*syscall_rule), parent);
239
4f7da553 240 hash = hash_key_ulong((void *) LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL,
959e3c66
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241 lttng_ht_seed);
242 hash ^= hash_key_str(syscall_rule->pattern, lttng_ht_seed);
243 if (syscall_rule->filter_expression) {
244 hash ^= hash_key_str(syscall_rule->filter_expression,
245 lttng_ht_seed);
246 }
247
248 return hash;
249}
250
6a751b95
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251static enum lttng_error_code lttng_event_rule_kernel_syscall_mi_serialize(
252 const struct lttng_event_rule *rule, struct mi_writer *writer)
253{
254 int ret;
255 enum lttng_error_code ret_code;
256 enum lttng_event_rule_status status;
257
258 enum lttng_event_rule_kernel_syscall_emission_site site_type;
259 const char *filter = NULL;
260 const char *name_pattern = NULL;
261 const char *site_type_str = NULL;
262
a0377dfe
FD
263 LTTNG_ASSERT(rule);
264 LTTNG_ASSERT(writer);
265 LTTNG_ASSERT(IS_SYSCALL_EVENT_RULE(rule));
6a751b95
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266
267 status = lttng_event_rule_kernel_syscall_get_name_pattern(
268 rule, &name_pattern);
a0377dfe
FD
269 LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK);
270 LTTNG_ASSERT(name_pattern);
6a751b95
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271
272 status = lttng_event_rule_kernel_syscall_get_filter(rule, &filter);
a0377dfe 273 LTTNG_ASSERT(status == LTTNG_EVENT_RULE_STATUS_OK ||
6a751b95
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274 status == LTTNG_EVENT_RULE_STATUS_UNSET);
275
276 site_type = lttng_event_rule_kernel_syscall_get_emission_site(rule);
277
278 switch (site_type) {
279 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY_EXIT:
280 site_type_str = mi_lttng_event_rule_kernel_syscall_emission_site_entry_exit;
281 break;
282 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY:
283 site_type_str = mi_lttng_event_rule_kernel_syscall_emission_site_entry;
284 break;
285 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_EXIT:
286 site_type_str = mi_lttng_event_rule_kernel_syscall_emission_site_exit;
287 break;
288 default:
289 abort();
290 break;
291 }
292
293 /* Open event rule kernel syscall element. */
294 ret = mi_lttng_writer_open_element(
295 writer, mi_lttng_element_event_rule_kernel_syscall);
296 if (ret) {
297 goto mi_error;
298 }
299
300 /* Emission site. */
301 ret = mi_lttng_writer_write_element_string(writer,
302 mi_lttng_element_event_rule_kernel_syscall_emission_site,
303 site_type_str);
304 if (ret) {
305 goto mi_error;
306 }
307
308 /* Name pattern. */
309 ret = mi_lttng_writer_write_element_string(writer,
310 mi_lttng_element_event_rule_name_pattern, name_pattern);
311 if (ret) {
312 goto mi_error;
313 }
314
315 /* Filter. */
316 if (filter != NULL) {
317 ret = mi_lttng_writer_write_element_string(writer,
318 mi_lttng_element_event_rule_filter_expression,
319 filter);
320 if (ret) {
321 goto mi_error;
322 }
323 }
324
325 /* Close event rule kernel syscall. */
326 ret = mi_lttng_writer_close_element(writer);
327 if (ret) {
328 goto mi_error;
329 }
330
331 ret_code = LTTNG_OK;
332 goto end;
333
334mi_error:
335 ret_code = LTTNG_ERR_MI_IO_FAIL;
336end:
337 return ret_code;
338}
339
4f7da553
JR
340struct lttng_event_rule *lttng_event_rule_kernel_syscall_create(
341 enum lttng_event_rule_kernel_syscall_emission_site
f6a5af19 342 emission_site)
e6a39346
JR
343{
344 struct lttng_event_rule *rule = NULL;
4f7da553 345 struct lttng_event_rule_kernel_syscall *syscall_rule;
67d38b93 346 enum lttng_event_rule_status status;
e6a39346 347
57739a6b 348 /* Validate the emission site type */
f6a5af19 349 switch (emission_site) {
4f7da553
JR
350 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY_EXIT:
351 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY:
352 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_EXIT:
57739a6b
JR
353 break;
354 default:
355 /* Invalid emission type */
356 goto end;
357 }
358
a6bc4ca9 359 syscall_rule = (lttng_event_rule_kernel_syscall *) zmalloc(sizeof(struct lttng_event_rule_kernel_syscall));
e6a39346
JR
360 if (!syscall_rule) {
361 goto end;
362 }
363
364 rule = &syscall_rule->parent;
365 lttng_event_rule_init(
4f7da553
JR
366 &syscall_rule->parent, LTTNG_EVENT_RULE_TYPE_KERNEL_SYSCALL);
367 syscall_rule->parent.validate = lttng_event_rule_kernel_syscall_validate;
368 syscall_rule->parent.serialize = lttng_event_rule_kernel_syscall_serialize;
369 syscall_rule->parent.equal = lttng_event_rule_kernel_syscall_is_equal;
370 syscall_rule->parent.destroy = lttng_event_rule_kernel_syscall_destroy;
e6a39346 371 syscall_rule->parent.generate_filter_bytecode =
4f7da553 372 lttng_event_rule_kernel_syscall_generate_filter_bytecode;
e6a39346 373 syscall_rule->parent.get_filter =
4f7da553 374 lttng_event_rule_kernel_syscall_get_internal_filter;
e6a39346 375 syscall_rule->parent.get_filter_bytecode =
4f7da553 376 lttng_event_rule_kernel_syscall_get_internal_filter_bytecode;
e6a39346 377 syscall_rule->parent.generate_exclusions =
4f7da553
JR
378 lttng_event_rule_kernel_syscall_generate_exclusions;
379 syscall_rule->parent.hash = lttng_event_rule_kernel_syscall_hash;
6a751b95 380 syscall_rule->parent.mi_serialize = lttng_event_rule_kernel_syscall_mi_serialize;
67d38b93
JR
381
382 /* Default pattern is '*'. */
4f7da553 383 status = lttng_event_rule_kernel_syscall_set_name_pattern(rule, "*");
67d38b93
JR
384 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
385 lttng_event_rule_destroy(rule);
386 rule = NULL;
387 }
388
57739a6b 389 /* Emission site type */
f6a5af19 390 syscall_rule->emission_site = emission_site;
57739a6b 391
e6a39346
JR
392end:
393 return rule;
394}
395
4f7da553 396ssize_t lttng_event_rule_kernel_syscall_create_from_payload(
e6a39346
JR
397 struct lttng_payload_view *view,
398 struct lttng_event_rule **_event_rule)
399{
400 ssize_t ret, offset = 0;
401 enum lttng_event_rule_status status;
4f7da553 402 const struct lttng_event_rule_kernel_syscall_comm *syscall_comm;
e6a39346
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403 const char *pattern;
404 const char *filter_expression = NULL;
405 struct lttng_buffer_view current_buffer_view;
406 struct lttng_event_rule *rule = NULL;
407
408 if (!_event_rule) {
409 ret = -1;
410 goto end;
411 }
412
413 if (view->buffer.size < sizeof(*syscall_comm)) {
414 ERR("Failed to initialize from malformed event rule syscall: buffer too short to contain header");
415 ret = -1;
416 goto end;
417 }
418
419 current_buffer_view = lttng_buffer_view_from_view(
420 &view->buffer, offset, sizeof(*syscall_comm));
3e6e0df2 421 if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
e6a39346
JR
422 ret = -1;
423 goto end;
424 }
425
3e6e0df2 426 syscall_comm = (typeof(syscall_comm)) current_buffer_view.data;
a6bc4ca9 427 rule = lttng_event_rule_kernel_syscall_create((lttng_event_rule_kernel_syscall_emission_site) syscall_comm->emission_site);
e6a39346
JR
428 if (!rule) {
429 ERR("Failed to create event rule syscall");
430 ret = -1;
431 goto end;
432 }
433
434 /* Skip to payload. */
435 offset += current_buffer_view.size;
436
437 /* Map the pattern. */
438 current_buffer_view = lttng_buffer_view_from_view(
439 &view->buffer, offset, syscall_comm->pattern_len);
3e6e0df2 440 if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
e6a39346
JR
441 ret = -1;
442 goto end;
443 }
444
3e6e0df2 445 pattern = current_buffer_view.data;
e6a39346
JR
446 if (!lttng_buffer_view_contains_string(&current_buffer_view, pattern,
447 syscall_comm->pattern_len)) {
448 ret = -1;
449 goto end;
450 }
451
452 /* Skip after the pattern. */
453 offset += syscall_comm->pattern_len;
454
455 if (!syscall_comm->filter_expression_len) {
456 goto skip_filter_expression;
457 }
458
459 /* Map the filter_expression. */
460 current_buffer_view = lttng_buffer_view_from_view(&view->buffer, offset,
461 syscall_comm->filter_expression_len);
3e6e0df2 462 if (!lttng_buffer_view_is_valid(&current_buffer_view)) {
e6a39346
JR
463 ret = -1;
464 goto end;
465 }
466
3e6e0df2 467 filter_expression = current_buffer_view.data;
e6a39346
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468 if (!lttng_buffer_view_contains_string(&current_buffer_view,
469 filter_expression,
470 syscall_comm->filter_expression_len)) {
471 ret = -1;
472 goto end;
473 }
474
475 /* Skip after the pattern. */
476 offset += syscall_comm->filter_expression_len;
477
478skip_filter_expression:
479
4f7da553 480 status = lttng_event_rule_kernel_syscall_set_name_pattern(rule, pattern);
e6a39346
JR
481 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
482 ERR("Failed to set event rule syscall pattern");
483 ret = -1;
484 goto end;
485 }
486
487 if (filter_expression) {
4f7da553 488 status = lttng_event_rule_kernel_syscall_set_filter(
e6a39346
JR
489 rule, filter_expression);
490 if (status != LTTNG_EVENT_RULE_STATUS_OK) {
491 ERR("Failed to set event rule syscall pattern");
492 ret = -1;
493 goto end;
494 }
495 }
496
497 *_event_rule = rule;
498 rule = NULL;
499 ret = offset;
500end:
501 lttng_event_rule_destroy(rule);
502 return ret;
503}
504
4f7da553 505enum lttng_event_rule_status lttng_event_rule_kernel_syscall_set_name_pattern(
e6a39346
JR
506 struct lttng_event_rule *rule, const char *pattern)
507{
508 char *pattern_copy = NULL;
4f7da553 509 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346
JR
510 enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
511
512 if (!rule || !IS_SYSCALL_EVENT_RULE(rule) || !pattern ||
513 strlen(pattern) == 0) {
514 status = LTTNG_EVENT_RULE_STATUS_INVALID;
515 goto end;
516 }
517
4f7da553 518 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
e6a39346
JR
519 pattern_copy = strdup(pattern);
520 if (!pattern_copy) {
521 status = LTTNG_EVENT_RULE_STATUS_ERROR;
522 goto end;
523 }
524
40fd2ccf
JR
525 strutils_normalize_star_glob_pattern(pattern_copy);
526
527 free(syscall->pattern);
e6a39346
JR
528
529 syscall->pattern = pattern_copy;
530 pattern_copy = NULL;
531end:
532 return status;
533}
534
4f7da553 535enum lttng_event_rule_status lttng_event_rule_kernel_syscall_get_name_pattern(
e6a39346
JR
536 const struct lttng_event_rule *rule, const char **pattern)
537{
4f7da553 538 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346
JR
539 enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
540
541 if (!rule || !IS_SYSCALL_EVENT_RULE(rule) || !pattern) {
542 status = LTTNG_EVENT_RULE_STATUS_INVALID;
543 goto end;
544 }
545
4f7da553 546 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
e6a39346
JR
547 if (!syscall->pattern) {
548 status = LTTNG_EVENT_RULE_STATUS_UNSET;
549 goto end;
550 }
551
552 *pattern = syscall->pattern;
553end:
554 return status;
555}
556
4f7da553 557enum lttng_event_rule_status lttng_event_rule_kernel_syscall_set_filter(
e6a39346
JR
558 struct lttng_event_rule *rule, const char *expression)
559{
560 char *expression_copy = NULL;
4f7da553 561 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346
JR
562 enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
563
564 /* TODO: validate that the passed expression is valid. */
565
566 if (!rule || !IS_SYSCALL_EVENT_RULE(rule) || !expression ||
567 strlen(expression) == 0) {
568 status = LTTNG_EVENT_RULE_STATUS_INVALID;
569 goto end;
570 }
571
4f7da553 572 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
e6a39346
JR
573 expression_copy = strdup(expression);
574 if (!expression_copy) {
575 status = LTTNG_EVENT_RULE_STATUS_ERROR;
576 goto end;
577 }
578
579 if (syscall->filter_expression) {
580 free(syscall->filter_expression);
581 }
582
583 syscall->filter_expression = expression_copy;
584 expression_copy = NULL;
585end:
586 return status;
587}
588
4f7da553 589enum lttng_event_rule_status lttng_event_rule_kernel_syscall_get_filter(
e6a39346
JR
590 const struct lttng_event_rule *rule, const char **expression)
591{
4f7da553 592 struct lttng_event_rule_kernel_syscall *syscall;
e6a39346
JR
593 enum lttng_event_rule_status status = LTTNG_EVENT_RULE_STATUS_OK;
594
595 if (!rule || !IS_SYSCALL_EVENT_RULE(rule) || !expression) {
596 status = LTTNG_EVENT_RULE_STATUS_INVALID;
597 goto end;
598 }
599
4f7da553 600 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
e6a39346
JR
601 if (!syscall->filter_expression) {
602 status = LTTNG_EVENT_RULE_STATUS_UNSET;
603 goto end;
604 }
605
606 *expression = syscall->filter_expression;
607end:
608 return status;
609}
4f7da553
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610extern enum lttng_event_rule_kernel_syscall_emission_site
611lttng_event_rule_kernel_syscall_get_emission_site(
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612 const struct lttng_event_rule *rule)
613{
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614 enum lttng_event_rule_kernel_syscall_emission_site emission_site =
615 LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_UNKNOWN;
616 struct lttng_event_rule_kernel_syscall *syscall;
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617
618 if (!rule || !IS_SYSCALL_EVENT_RULE(rule)) {
619 goto end;
620 }
621
4f7da553 622 syscall = container_of(rule, struct lttng_event_rule_kernel_syscall, parent);
f6a5af19 623 emission_site = syscall->emission_site;
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624
625end:
f6a5af19 626 return emission_site;
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627}
628
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629const char *lttng_event_rule_kernel_syscall_emission_site_str(
630 enum lttng_event_rule_kernel_syscall_emission_site emission_site)
57739a6b 631{
f6a5af19 632 switch (emission_site) {
4f7da553 633 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY:
57739a6b 634 return "entry";
4f7da553 635 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_ENTRY_EXIT:
57739a6b 636 return "entry+exit";
4f7da553 637 case LTTNG_EVENT_RULE_KERNEL_SYSCALL_EMISSION_SITE_EXIT:
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638 return "exit";
639 default:
640 return "???";
641 }
642}
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