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6d60f896 DBO |
1 | // SPDX-License-Identifier: GPL-2.0 |
2 | /* | |
3 | * in kernel monitor support: allows rv to control in-kernel monitors. | |
4 | * | |
5 | * Copyright (C) 2022 Red Hat Inc, Daniel Bristot de Oliveira <bristot@kernel.org> | |
6 | */ | |
7 | #include <getopt.h> | |
8 | #include <stdlib.h> | |
9 | #include <string.h> | |
10 | #include <errno.h> | |
11 | #include <unistd.h> | |
12 | ||
13 | #include <trace.h> | |
14 | #include <utils.h> | |
15 | #include <rv.h> | |
16 | ||
17 | static int config_has_id; | |
18 | static int config_my_pid; | |
19 | static int config_trace; | |
20 | ||
21 | static char *config_initial_reactor; | |
22 | static char *config_reactor; | |
23 | ||
24 | /* | |
25 | * __ikm_read_enable - reads monitor's enable status | |
26 | * | |
27 | * __does not log errors. | |
28 | * | |
29 | * Returns the current status, or -1 if the monitor does not exist, | |
30 | * __hence not logging errors. | |
31 | */ | |
32 | static int __ikm_read_enable(char *monitor_name) | |
33 | { | |
34 | char path[MAX_PATH]; | |
35 | long long enabled; | |
36 | int retval; | |
37 | ||
38 | snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); | |
39 | ||
40 | retval = tracefs_instance_file_read_number(NULL, path, &enabled); | |
41 | if (retval < 0) | |
42 | return -1; | |
43 | ||
44 | return enabled; | |
45 | } | |
46 | ||
47 | /* | |
48 | * ikm_read_enable - reads monitor's enable status | |
49 | * | |
50 | * Returns the current status, or -1 on error. | |
51 | */ | |
52 | static int ikm_read_enable(char *monitor_name) | |
53 | { | |
54 | int enabled; | |
55 | ||
56 | enabled = __ikm_read_enable(monitor_name); | |
57 | if (enabled < 0) { | |
58 | err_msg("ikm: fail read enabled: %d\n", enabled); | |
59 | return -1; | |
60 | } | |
61 | ||
62 | debug_msg("ikm: read enabled: %d\n", enabled); | |
63 | ||
64 | return enabled; | |
65 | } | |
66 | ||
67 | /* | |
68 | * ikm_write_enable - write to the monitor's enable file | |
69 | * | |
70 | * Return the number of bytes written, -1 on error. | |
71 | */ | |
72 | static int ikm_write_enable(char *monitor_name, char *enable_disable) | |
73 | { | |
74 | char path[MAX_PATH]; | |
75 | int retval; | |
76 | ||
77 | debug_msg("ikm: writing enabled: %s\n", enable_disable); | |
78 | ||
79 | snprintf(path, MAX_PATH, "rv/monitors/%s/enable", monitor_name); | |
80 | retval = tracefs_instance_file_write(NULL, path, enable_disable); | |
81 | if (retval < strlen(enable_disable)) { | |
82 | err_msg("ikm: writing enabled: %s\n", enable_disable); | |
83 | return -1; | |
84 | } | |
85 | ||
86 | return retval; | |
87 | } | |
88 | ||
89 | /* | |
90 | * ikm_enable - enable a monitor | |
91 | * | |
92 | * Returns -1 on failure. Success otherwise. | |
93 | */ | |
94 | static int ikm_enable(char *monitor_name) | |
95 | { | |
96 | return ikm_write_enable(monitor_name, "1"); | |
97 | } | |
98 | ||
99 | /* | |
100 | * ikm_disable - disable a monitor | |
101 | * | |
102 | * Returns -1 on failure. Success otherwise. | |
103 | */ | |
104 | static int ikm_disable(char *monitor_name) | |
105 | { | |
106 | return ikm_write_enable(monitor_name, "0"); | |
107 | } | |
108 | ||
109 | /* | |
110 | * ikm_read_desc - read monitors' description | |
111 | * | |
112 | * Return a dynamically allocated string with the monitor's | |
113 | * description, NULL otherwise. | |
114 | */ | |
115 | static char *ikm_read_desc(char *monitor_name) | |
116 | { | |
117 | char path[MAX_PATH]; | |
118 | char *desc; | |
119 | ||
120 | snprintf(path, MAX_PATH, "rv/monitors/%s/desc", monitor_name); | |
121 | desc = tracefs_instance_file_read(NULL, path, NULL); | |
122 | if (!desc) { | |
123 | err_msg("ikm: error reading monitor %s desc\n", monitor_name); | |
124 | return NULL; | |
125 | } | |
126 | ||
127 | *strstr(desc, "\n") = '\0'; | |
128 | ||
129 | return desc; | |
130 | } | |
131 | ||
132 | /* | |
133 | * ikm_fill_monitor_definition - fill monitor's definition | |
134 | * | |
135 | * Returns -1 on error, 0 otherwise. | |
136 | */ | |
137 | static int ikm_fill_monitor_definition(char *name, struct monitor *ikm) | |
138 | { | |
139 | int enabled; | |
140 | char *desc; | |
141 | ||
142 | enabled = ikm_read_enable(name); | |
143 | if (enabled < 0) { | |
144 | err_msg("ikm: monitor %s fail to read enable file, bug?\n", name); | |
145 | return -1; | |
146 | } | |
147 | ||
148 | desc = ikm_read_desc(name); | |
149 | if (!desc) { | |
150 | err_msg("ikm: monitor %s does not have desc file, bug?\n", name); | |
151 | return -1; | |
152 | } | |
153 | ||
154 | strncpy(ikm->name, name, MAX_DA_NAME_LEN); | |
155 | ikm->enabled = enabled; | |
156 | strncpy(ikm->desc, desc, MAX_DESCRIPTION); | |
157 | ||
158 | free(desc); | |
159 | ||
160 | return 0; | |
161 | } | |
162 | ||
163 | /* | |
164 | * ikm_write_reactor - switch the reactor to *reactor | |
165 | * | |
166 | * Return the number or characters written, -1 on error. | |
167 | */ | |
168 | static int ikm_write_reactor(char *monitor_name, char *reactor) | |
169 | { | |
170 | char path[MAX_PATH]; | |
171 | int retval; | |
172 | ||
173 | snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); | |
174 | retval = tracefs_instance_file_write(NULL, path, reactor); | |
175 | debug_msg("ikm: write \"%s\" reactors: %d\n", reactor, retval); | |
176 | ||
177 | return retval; | |
178 | } | |
179 | ||
180 | /* | |
181 | * ikm_read_reactor - read the reactors file | |
182 | * | |
183 | * Returns a dynamically allocated string with monitor's | |
184 | * available reactors, or NULL on error. | |
185 | */ | |
186 | static char *ikm_read_reactor(char *monitor_name) | |
187 | { | |
188 | char path[MAX_PATH]; | |
189 | char *reactors; | |
190 | ||
191 | snprintf(path, MAX_PATH, "rv/monitors/%s/reactors", monitor_name); | |
192 | reactors = tracefs_instance_file_read(NULL, path, NULL); | |
193 | if (!reactors) { | |
194 | err_msg("ikm: fail reading monitor's %s reactors file\n", monitor_name); | |
195 | return NULL; | |
196 | } | |
197 | ||
198 | return reactors; | |
199 | } | |
200 | ||
201 | /* | |
202 | * ikm_get_current_reactor - get the current enabled reactor | |
203 | * | |
204 | * Reads the reactors file and find the currently enabled | |
205 | * [reactor]. | |
206 | * | |
207 | * Returns a dynamically allocated memory with the current | |
208 | * reactor. NULL otherwise. | |
209 | */ | |
210 | static char *ikm_get_current_reactor(char *monitor_name) | |
211 | { | |
212 | char *reactors = ikm_read_reactor(monitor_name); | |
61ec586b | 213 | char *curr_reactor = NULL; |
6d60f896 DBO |
214 | char *start; |
215 | char *end; | |
6d60f896 DBO |
216 | |
217 | if (!reactors) | |
218 | return NULL; | |
219 | ||
220 | start = strstr(reactors, "["); | |
221 | if (!start) | |
222 | goto out_free; | |
223 | ||
224 | start++; | |
225 | ||
226 | end = strstr(start, "]"); | |
227 | if (!end) | |
228 | goto out_free; | |
229 | ||
230 | *end = '\0'; | |
231 | ||
232 | curr_reactor = calloc(strlen(start) + 1, sizeof(char)); | |
233 | if (!curr_reactor) | |
234 | goto out_free; | |
235 | ||
236 | strncpy(curr_reactor, start, strlen(start)); | |
237 | debug_msg("ikm: read current reactor %s\n", curr_reactor); | |
238 | ||
239 | out_free: | |
240 | free(reactors); | |
241 | ||
242 | return curr_reactor; | |
243 | } | |
244 | ||
245 | static int ikm_has_id(char *monitor_name) | |
246 | { | |
247 | char path[MAX_PATH]; | |
248 | char *format; | |
249 | int has_id; | |
250 | ||
251 | snprintf(path, MAX_PATH, "events/rv/event_%s/format", monitor_name); | |
252 | format = tracefs_instance_file_read(NULL, path, NULL); | |
253 | if (!format) { | |
254 | err_msg("ikm: fail reading monitor's %s format event file\n", monitor_name); | |
255 | return -1; | |
256 | } | |
257 | ||
258 | /* print fmt: "%d: %s x %s -> %s %s", REC->id, ... */ | |
259 | has_id = !!strstr(format, "REC->id"); | |
260 | ||
261 | debug_msg("ikm: monitor %s has id: %s\n", monitor_name, has_id ? "yes" : "no"); | |
262 | ||
263 | free(format); | |
264 | ||
265 | return has_id; | |
266 | } | |
267 | ||
268 | /** | |
269 | * ikm_list_monitors - list all available monitors | |
270 | * | |
271 | * Returns 0 on success, -1 otherwise. | |
272 | */ | |
273 | int ikm_list_monitors(void) | |
274 | { | |
275 | char *available_monitors; | |
276 | struct monitor ikm; | |
277 | char *curr, *next; | |
278 | int retval; | |
279 | ||
280 | available_monitors = tracefs_instance_file_read(NULL, "rv/available_monitors", NULL); | |
281 | ||
282 | if (!available_monitors) { | |
283 | err_msg("ikm: available monitors is not available, is CONFIG_RV enabled?\n"); | |
284 | return -1; | |
285 | } | |
286 | ||
287 | curr = available_monitors; | |
288 | do { | |
289 | next = strstr(curr, "\n"); | |
290 | *next = '\0'; | |
291 | ||
292 | retval = ikm_fill_monitor_definition(curr, &ikm); | |
293 | if (retval) | |
294 | err_msg("ikm: error reading %d in kernel monitor, skipping\n", curr); | |
295 | ||
296 | printf("%-24s %s %s\n", ikm.name, ikm.desc, ikm.enabled ? "[ON]" : "[OFF]"); | |
297 | curr = ++next; | |
298 | ||
299 | } while (strlen(curr)); | |
300 | ||
301 | free(available_monitors); | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | static void ikm_print_header(struct trace_seq *s) | |
307 | { | |
308 | trace_seq_printf(s, "%16s-%-8s %5s %5s ", "<TASK>", "PID", "[CPU]", "TYPE"); | |
309 | if (config_has_id) | |
310 | trace_seq_printf(s, "%8s ", "ID"); | |
311 | ||
312 | trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", | |
313 | "STATE", | |
314 | "EVENT", | |
315 | "NEXT_STATE", | |
316 | "FINAL"); | |
317 | ||
318 | trace_seq_printf(s, "%16s %-8s %5s %5s ", " | ", " | ", " | ", " | "); | |
319 | ||
320 | if (config_has_id) | |
321 | trace_seq_printf(s, "%8s ", " | "); | |
322 | ||
323 | trace_seq_printf(s, "%24s %-24s %-24s %s\n", | |
324 | " | ", | |
325 | " | ", | |
326 | " | ", | |
327 | "|"); | |
328 | ||
329 | } | |
330 | ||
331 | /* | |
332 | * ikm_event_handler - callback to handle event events | |
333 | * | |
334 | * Called any time a rv:"monitor"_event events is generated. | |
335 | * It parses and print event. | |
336 | */ | |
337 | static int | |
338 | ikm_event_handler(struct trace_seq *s, struct tep_record *record, | |
339 | struct tep_event *trace_event, void *context) | |
340 | { | |
341 | /* if needed: struct trace_instance *inst = context; */ | |
342 | char *state, *event, *next_state; | |
343 | unsigned long long final_state; | |
344 | unsigned long long pid; | |
345 | unsigned long long id; | |
346 | int cpu = record->cpu; | |
347 | int val; | |
348 | ||
349 | if (config_has_id) | |
350 | tep_get_field_val(s, trace_event, "id", record, &id, 1); | |
351 | ||
352 | tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); | |
353 | ||
354 | if (config_has_id && (config_my_pid == id)) | |
355 | return 0; | |
356 | else if (config_my_pid && (config_my_pid == pid)) | |
357 | return 0; | |
358 | ||
359 | tep_print_event(trace_event->tep, s, record, "%16s-%-8d ", TEP_PRINT_COMM, TEP_PRINT_PID); | |
360 | ||
361 | trace_seq_printf(s, "[%.3d] event ", cpu); | |
362 | ||
363 | if (config_has_id) | |
364 | trace_seq_printf(s, "%8llu ", id); | |
365 | ||
366 | state = tep_get_field_raw(s, trace_event, "state", record, &val, 0); | |
367 | event = tep_get_field_raw(s, trace_event, "event", record, &val, 0); | |
368 | next_state = tep_get_field_raw(s, trace_event, "next_state", record, &val, 0); | |
369 | tep_get_field_val(s, trace_event, "final_state", record, &final_state, 1); | |
370 | ||
371 | trace_seq_printf(s, "%24s x %-24s -> %-24s %s\n", | |
372 | state, | |
373 | event, | |
374 | next_state, | |
375 | final_state ? "Y" : "N"); | |
376 | ||
377 | trace_seq_do_printf(s); | |
378 | trace_seq_reset(s); | |
379 | ||
380 | return 0; | |
381 | } | |
382 | ||
383 | /* | |
384 | * ikm_error_handler - callback to handle error events | |
385 | * | |
386 | * Called any time a rv:"monitor"_errors events is generated. | |
387 | * It parses and print event. | |
388 | */ | |
389 | static int | |
390 | ikm_error_handler(struct trace_seq *s, struct tep_record *record, | |
391 | struct tep_event *trace_event, void *context) | |
392 | { | |
393 | unsigned long long pid, id; | |
394 | int cpu = record->cpu; | |
395 | char *state, *event; | |
396 | int val; | |
397 | ||
398 | if (config_has_id) | |
399 | tep_get_field_val(s, trace_event, "id", record, &id, 1); | |
400 | ||
401 | tep_get_common_field_val(s, trace_event, "common_pid", record, &pid, 1); | |
402 | ||
403 | if (config_has_id && config_my_pid == id) | |
404 | return 0; | |
405 | else if (config_my_pid == pid) | |
406 | return 0; | |
407 | ||
408 | trace_seq_printf(s, "%8lld [%03d] error ", pid, cpu); | |
409 | ||
410 | if (config_has_id) | |
411 | trace_seq_printf(s, "%8llu ", id); | |
412 | ||
413 | state = tep_get_field_raw(s, trace_event, "state", record, &val, 0); | |
414 | event = tep_get_field_raw(s, trace_event, "event", record, &val, 0); | |
415 | ||
416 | trace_seq_printf(s, "%24s x %s\n", state, event); | |
417 | ||
418 | trace_seq_do_printf(s); | |
419 | trace_seq_reset(s); | |
420 | ||
421 | return 0; | |
422 | } | |
423 | ||
424 | /* | |
425 | * ikm_setup_trace_instance - set up a tracing instance to collect data | |
426 | * | |
427 | * Create a trace instance, enable rv: events and enable the trace. | |
428 | * | |
429 | * Returns the trace_instance * with all set, NULL otherwise. | |
430 | */ | |
431 | static struct trace_instance *ikm_setup_trace_instance(char *monitor_name) | |
432 | { | |
433 | char event[MAX_DA_NAME_LEN + 7]; /* max(error_,event_) + '0' = 7 */ | |
434 | struct trace_instance *inst; | |
435 | int retval; | |
436 | ||
437 | if (!config_trace) | |
438 | return NULL; | |
439 | ||
440 | config_has_id = ikm_has_id(monitor_name); | |
441 | if (config_has_id < 0) { | |
442 | err_msg("ikm: failed to read monitor %s event format\n", monitor_name); | |
443 | goto out_err; | |
444 | } | |
445 | ||
446 | /* alloc data */ | |
447 | inst = calloc(1, sizeof(*inst)); | |
448 | if (!inst) { | |
449 | err_msg("ikm: failed to allocate trace instance"); | |
450 | goto out_err; | |
451 | } | |
452 | ||
453 | retval = trace_instance_init(inst, monitor_name); | |
454 | if (retval) | |
455 | goto out_free; | |
456 | ||
457 | /* enable events */ | |
458 | snprintf(event, sizeof(event), "event_%s", monitor_name); | |
459 | retval = tracefs_event_enable(inst->inst, "rv", event); | |
460 | if (retval) | |
461 | goto out_inst; | |
462 | ||
463 | tep_register_event_handler(inst->tep, -1, "rv", event, | |
464 | ikm_event_handler, NULL); | |
465 | ||
466 | snprintf(event, sizeof(event), "error_%s", monitor_name); | |
467 | retval = tracefs_event_enable(inst->inst, "rv", event); | |
468 | if (retval) | |
469 | goto out_inst; | |
470 | ||
471 | tep_register_event_handler(inst->tep, -1, "rv", event, | |
472 | ikm_error_handler, NULL); | |
473 | ||
474 | /* ready to enable */ | |
475 | tracefs_trace_on(inst->inst); | |
476 | ||
477 | return inst; | |
478 | ||
479 | out_inst: | |
480 | trace_instance_destroy(inst); | |
481 | out_free: | |
482 | free(inst); | |
483 | out_err: | |
484 | return NULL; | |
485 | } | |
486 | ||
487 | /** | |
488 | * ikm_destroy_trace_instance - destroy a previously created instance | |
489 | */ | |
490 | static void ikm_destroy_trace_instance(struct trace_instance *inst) | |
491 | { | |
492 | if (!inst) | |
493 | return; | |
494 | ||
495 | trace_instance_destroy(inst); | |
496 | free(inst); | |
497 | } | |
498 | ||
499 | /* | |
500 | * ikm_usage_print_reactors - print all available reactors, one per line. | |
501 | */ | |
502 | static void ikm_usage_print_reactors(void) | |
503 | { | |
504 | char *reactors = tracefs_instance_file_read(NULL, "rv/available_reactors", NULL); | |
505 | char *start, *end; | |
506 | ||
507 | if (!reactors) | |
508 | return; | |
509 | ||
510 | fprintf(stderr, " available reactors:"); | |
511 | ||
512 | start = reactors; | |
513 | end = strstr(start, "\n"); | |
514 | ||
515 | while (end) { | |
516 | *end = '\0'; | |
517 | ||
518 | fprintf(stderr, " %s", start); | |
519 | ||
520 | start = ++end; | |
521 | end = strstr(start, "\n"); | |
a37380ef | 522 | } |
6d60f896 DBO |
523 | |
524 | fprintf(stderr, "\n"); | |
525 | } | |
526 | /* | |
527 | * ikm_usage - print usage | |
528 | */ | |
529 | static void ikm_usage(int exit_val, char *monitor_name, const char *fmt, ...) | |
530 | { | |
531 | ||
532 | char message[1024]; | |
533 | va_list ap; | |
534 | int i; | |
535 | ||
536 | static const char *const usage[] = { | |
537 | "", | |
538 | " -h/--help: print this menu and the reactor list", | |
539 | " -r/--reactor 'reactor': enables the 'reactor'", | |
540 | " -s/--self: when tracing (-t), also trace rv command", | |
541 | " -t/--trace: trace monitor's event", | |
542 | " -v/--verbose: print debug messages", | |
543 | "", | |
544 | NULL, | |
545 | }; | |
546 | ||
547 | va_start(ap, fmt); | |
548 | vsnprintf(message, sizeof(message), fmt, ap); | |
549 | va_end(ap); | |
550 | ||
551 | fprintf(stderr, " %s\n", message); | |
552 | ||
553 | fprintf(stderr, "\n usage: rv mon %s [-h] [-q] [-r reactor] [-s] [-v]", monitor_name); | |
554 | ||
555 | for (i = 0; usage[i]; i++) | |
556 | fprintf(stderr, "%s\n", usage[i]); | |
557 | ||
558 | ikm_usage_print_reactors(); | |
559 | exit(exit_val); | |
560 | } | |
561 | ||
562 | /* | |
563 | * parse_arguments - parse arguments and set config | |
564 | */ | |
565 | static int parse_arguments(char *monitor_name, int argc, char **argv) | |
566 | { | |
567 | int c, retval; | |
568 | ||
569 | config_my_pid = getpid(); | |
570 | ||
571 | while (1) { | |
572 | static struct option long_options[] = { | |
573 | {"help", no_argument, 0, 'h'}, | |
574 | {"reactor", required_argument, 0, 'r'}, | |
575 | {"self", no_argument, 0, 's'}, | |
576 | {"trace", no_argument, 0, 't'}, | |
577 | {"verbose", no_argument, 0, 'v'}, | |
578 | {0, 0, 0, 0} | |
579 | }; | |
580 | ||
581 | /* getopt_long stores the option index here. */ | |
582 | int option_index = 0; | |
583 | ||
584 | c = getopt_long(argc, argv, "hr:stv", long_options, &option_index); | |
585 | ||
586 | /* detect the end of the options. */ | |
587 | if (c == -1) | |
588 | break; | |
589 | ||
590 | switch (c) { | |
591 | case 'h': | |
592 | ikm_usage(0, monitor_name, "help:"); | |
593 | break; | |
594 | case 'r': | |
595 | config_reactor = optarg; | |
596 | break; | |
597 | case 's': | |
598 | config_my_pid = 0; | |
599 | break; | |
600 | case 't': | |
601 | config_trace = 1; | |
602 | break; | |
603 | case 'v': | |
604 | config_debug = 1; | |
605 | break; | |
606 | } | |
607 | } | |
608 | ||
609 | if (config_reactor) { | |
610 | config_initial_reactor = ikm_get_current_reactor(monitor_name); | |
611 | if (!config_initial_reactor) | |
612 | ikm_usage(1, monitor_name, | |
613 | "ikm: failed to read current reactor, are reactors enabled?"); | |
614 | ||
615 | retval = ikm_write_reactor(monitor_name, config_reactor); | |
616 | if (retval <= 0) | |
617 | ikm_usage(1, monitor_name, | |
618 | "ikm: failed to set %s reactor, is it available?", | |
619 | config_reactor); | |
620 | } | |
621 | ||
622 | debug_msg("ikm: my pid is %d\n", config_my_pid); | |
623 | ||
624 | return 0; | |
625 | } | |
626 | ||
627 | /** | |
628 | * ikm_run_monitor - apply configs and run the monitor | |
629 | * | |
630 | * Returns 1 if a monitor was found an executed, 0 if no | |
631 | * monitors were found, or -1 on error. | |
632 | */ | |
633 | int ikm_run_monitor(char *monitor_name, int argc, char **argv) | |
634 | { | |
635 | struct trace_instance *inst = NULL; | |
636 | int retval; | |
637 | ||
638 | /* | |
639 | * Check if monitor exists by seeing it is enabled. | |
640 | */ | |
641 | retval = __ikm_read_enable(monitor_name); | |
642 | if (retval < 0) | |
643 | return 0; | |
644 | ||
645 | if (retval) { | |
646 | err_msg("ikm: monitor %s (in-kernel) is already enabled\n", monitor_name); | |
647 | return -1; | |
648 | } | |
649 | ||
650 | /* we should be good to go */ | |
651 | retval = parse_arguments(monitor_name, argc, argv); | |
652 | if (retval) | |
653 | ikm_usage(1, monitor_name, "ikm: failed parsing arguments"); | |
654 | ||
655 | if (config_trace) { | |
656 | inst = ikm_setup_trace_instance(monitor_name); | |
657 | if (!inst) | |
658 | return -1; | |
659 | } | |
660 | ||
661 | retval = ikm_enable(monitor_name); | |
662 | if (retval < 0) | |
663 | goto out_free_instance; | |
664 | ||
665 | if (config_trace) | |
666 | ikm_print_header(inst->seq); | |
667 | ||
668 | while (!should_stop()) { | |
669 | if (config_trace) { | |
670 | retval = tracefs_iterate_raw_events(inst->tep, | |
671 | inst->inst, | |
672 | NULL, | |
673 | 0, | |
674 | collect_registered_events, | |
675 | inst); | |
676 | if (retval) { | |
677 | err_msg("ikm: error reading trace buffer\n"); | |
678 | break; | |
679 | } | |
680 | } | |
681 | ||
682 | sleep(1); | |
683 | } | |
684 | ||
685 | ikm_disable(monitor_name); | |
686 | ikm_destroy_trace_instance(inst); | |
687 | ||
688 | if (config_reactor && config_initial_reactor) | |
689 | ikm_write_reactor(monitor_name, config_initial_reactor); | |
690 | ||
691 | return 1; | |
692 | ||
693 | out_free_instance: | |
694 | ikm_destroy_trace_instance(inst); | |
695 | if (config_reactor && config_initial_reactor) | |
696 | ikm_write_reactor(monitor_name, config_initial_reactor); | |
697 | return -1; | |
698 | } |