8a3416c8dd6bf41659b695a458d2bd52c0c50993
[lttngtop.git] / src / lttngtop.c
1 /*
2 * Copyright (C) 2011-2012 Julien Desfossez
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License Version 2 as
6 * published by the Free Software Foundation;
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 * GNU General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write to the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16 */
17
18 #define _GNU_SOURCE
19 #include <config.h>
20 #include <stdio.h>
21 #include <stdint.h>
22 #include <babeltrace/babeltrace.h>
23 #include <babeltrace/ctf/events.h>
24 #include <babeltrace/ctf/callbacks.h>
25 #include <babeltrace/ctf/iterator.h>
26 #include <fcntl.h>
27 #include <pthread.h>
28 #include <popt.h>
29 #include <stdlib.h>
30 #include <ftw.h>
31 #include <dirent.h>
32 #include <ctype.h>
33 #include <sys/stat.h>
34 #include <unistd.h>
35 #include <string.h>
36 #include <errno.h>
37 #include <sys/types.h>
38 #include <fts.h>
39 #include <assert.h>
40 #include <sys/mman.h>
41 #include <lttng/lttng.h>
42 #include <lttng/lttngtop-helper.h>
43 #include <babeltrace/lttngtopmmappacketseek.h>
44
45 #include "lttngtoptypes.h"
46 #include "cputop.h"
47 #include "iostreamtop.h"
48 #include "cursesdisplay.h"
49 #include "common.h"
50
51 #define DEFAULT_FILE_ARRAY_SIZE 1
52
53 const char *opt_input_path;
54 int opt_textdump;
55
56 int quit = 0;
57
58 struct lttngtop *copy;
59 pthread_t display_thread;
60 pthread_t timer_thread;
61
62 unsigned long refresh_display = 1 * NSEC_PER_SEC;
63 unsigned long last_display_update = 0;
64
65 /* list of FDs available for being read with snapshots */
66 struct mmap_stream_list mmap_list;
67 GPtrArray *lttng_consumer_stream_array;
68 int sessiond_metadata, consumerd_metadata;
69 struct lttng_consumer_local_data *ctx = NULL;
70 /* list of snapshots currently not consumed */
71 GPtrArray *available_snapshots;
72 sem_t metadata_available;
73 FILE *metadata_fp;
74 int trace_opened = 0;
75 int metadata_ready = 0;
76
77 enum {
78 OPT_NONE = 0,
79 OPT_HELP,
80 OPT_TEXTDUMP,
81 };
82
83 static struct poptOption long_options[] = {
84 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
85 { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
86 { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
87 { NULL, 0, 0, NULL, 0, NULL, NULL },
88 };
89
90 void *refresh_thread(void *p)
91 {
92 struct mmap_stream *mmap_info;
93
94 while (1) {
95 if (quit) {
96 sem_post(&pause_sem);
97 sem_post(&timer);
98 sem_post(&goodtodisplay);
99 pthread_exit(0);
100 }
101 bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
102 helper_kernctl_buffer_flush(mmap_info->fd);
103 sem_wait(&pause_sem);
104 sem_post(&pause_sem);
105 sem_post(&timer);
106 sleep(refresh_display/NSEC_PER_SEC);
107 }
108 }
109
110 void *ncurses_display(void *p)
111 {
112 unsigned int current_display_index = 0;
113
114 sem_wait(&bootstrap);
115 /*
116 * Prevent the 1 second delay when we hit ESC
117 */
118 ESCDELAY = 0;
119 init_ncurses();
120
121 while (1) {
122 sem_wait(&timer);
123 sem_wait(&goodtodisplay);
124 sem_wait(&pause_sem);
125
126 if (quit) {
127 reset_ncurses();
128 pthread_exit(0);
129 }
130
131
132 copy = g_ptr_array_index(copies, current_display_index);
133 assert(copy);
134 display(current_display_index++);
135
136 sem_post(&goodtoupdate);
137 sem_post(&pause_sem);
138 }
139 }
140
141 /*
142 * hook on each event to check the timestamp and refresh the display if
143 * necessary
144 */
145 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
146 {
147 unsigned long timestamp;
148 struct tm start;
149 uint64_t ts_nsec_start;
150
151 timestamp = bt_ctf_get_timestamp(call_data);
152
153 start = format_timestamp(timestamp);
154 ts_nsec_start = timestamp % NSEC_PER_SEC;
155
156 printf("%02d:%02d:%02d.%09" PRIu64 " %s\n", start.tm_hour,
157 start.tm_min, start.tm_sec, ts_nsec_start,
158 bt_ctf_event_name(call_data));
159
160 return BT_CB_OK;
161 }
162
163 /*
164 * hook on each event to check the timestamp and refresh the display if
165 * necessary
166 */
167 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
168 {
169 unsigned long timestamp;
170
171 timestamp = bt_ctf_get_timestamp(call_data);
172 if (timestamp == -1ULL)
173 goto error;
174
175 if (last_display_update == 0)
176 last_display_update = timestamp;
177
178 if (timestamp - last_display_update >= refresh_display) {
179 sem_wait(&goodtoupdate);
180 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
181 timestamp));
182 sem_post(&goodtodisplay);
183 sem_post(&bootstrap);
184 last_display_update = timestamp;
185 }
186 return BT_CB_OK;
187
188 error:
189 fprintf(stderr, "check_timestamp callback error\n");
190 return BT_CB_ERROR_STOP;
191 }
192
193 /*
194 * get_perf_counter : get or create and return a perf_counter struct for
195 * either a process or a cpu (only one of the 2 parameters mandatory)
196 */
197 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
198 struct cputime *cpu)
199 {
200 struct perfcounter *ret;
201 GHashTable *table;
202
203 if (proc)
204 table = proc->perf;
205 else if (cpu)
206 table = cpu->perf;
207 else
208 goto error;
209
210 ret = g_hash_table_lookup(table, (gpointer) name);
211 if (ret)
212 goto end;
213
214 ret = g_new0(struct perfcounter, 1);
215 /* by default, make it visible in the UI */
216 ret->visible = 1;
217 g_hash_table_insert(table, (gpointer) strdup(name), ret);
218
219 end:
220 return ret;
221
222 error:
223 return NULL;
224 }
225
226 void update_perf_value(struct processtop *proc, struct cputime *cpu,
227 const char *name, int value)
228 {
229 struct perfcounter *cpu_perf, *process_perf;
230
231 cpu_perf = get_perf_counter(name, NULL, cpu);
232 if (cpu_perf->count < value) {
233 process_perf = get_perf_counter(name, proc, NULL);
234 process_perf->count += value - cpu_perf->count;
235 cpu_perf->count = value;
236 }
237 }
238
239 void extract_perf_counter_scope(const struct bt_ctf_event *event,
240 const struct bt_definition *scope,
241 struct processtop *proc,
242 struct cputime *cpu)
243 {
244 struct bt_definition const * const *list = NULL;
245 const struct bt_definition *field;
246 unsigned int count;
247 struct perfcounter *perfcounter;
248 GHashTableIter iter;
249 gpointer key;
250 int ret;
251
252 if (!scope)
253 goto end;
254
255 ret = bt_ctf_get_field_list(event, scope, &list, &count);
256 if (ret < 0)
257 goto end;
258
259 if (count == 0)
260 goto end;
261
262 g_hash_table_iter_init(&iter, global_perf_liszt);
263 while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
264 field = bt_ctf_get_field(event, scope, (char *) key);
265 if (field) {
266 int value = bt_ctf_get_uint64(field);
267 if (bt_ctf_field_get_error())
268 continue;
269 update_perf_value(proc, cpu, (char *) key, value);
270 }
271 }
272
273 end:
274 return;
275 }
276
277 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
278 {
279 struct cputime *cpu;
280 const struct bt_definition *scope;
281
282 cpu = get_cpu(get_cpu_id(event));
283
284 scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
285 extract_perf_counter_scope(event, scope, proc, cpu);
286
287 scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
288 extract_perf_counter_scope(event, scope, proc, cpu);
289
290 scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
291 extract_perf_counter_scope(event, scope, proc, cpu);
292 }
293
294 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
295 void *private_data)
296 {
297 int pid, tid, ppid;
298 char *comm;
299 struct processtop *parent, *child;
300 unsigned long timestamp;
301
302 timestamp = bt_ctf_get_timestamp(call_data);
303 if (timestamp == -1ULL)
304 goto error;
305
306 pid = get_context_pid(call_data);
307 if (pid == -1ULL) {
308 goto error;
309 }
310 tid = get_context_tid(call_data);
311 if (tid == -1ULL) {
312 goto error;
313 }
314 ppid = get_context_ppid(call_data);
315 if (ppid == -1ULL) {
316 goto error;
317 }
318 comm = get_context_comm(call_data);
319 if (!comm) {
320 goto error;
321 }
322
323 /* find or create the current process */
324 child = find_process_tid(&lttngtop, tid, comm);
325 if (!child)
326 child = add_proc(&lttngtop, tid, comm, timestamp);
327 update_proc(child, pid, tid, ppid, comm);
328
329 if (pid != tid) {
330 /* find or create the parent */
331 parent = find_process_tid(&lttngtop, pid, comm);
332 if (!parent) {
333 parent = add_proc(&lttngtop, pid, comm, timestamp);
334 parent->pid = pid;
335 }
336
337 /* attach the parent to the current process */
338 child->threadparent = parent;
339 add_thread(parent, child);
340 }
341
342 update_perf_counter(child, call_data);
343
344 return BT_CB_OK;
345
346 error:
347 return BT_CB_ERROR_STOP;
348 }
349
350 void init_lttngtop()
351 {
352 copies = g_ptr_array_new();
353 global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
354
355 sem_init(&goodtodisplay, 0, 0);
356 sem_init(&goodtoupdate, 0, 1);
357 sem_init(&timer, 0, 1);
358 sem_init(&bootstrap, 0, 0);
359 sem_init(&pause_sem, 0, 1);
360 sem_init(&end_trace_sem, 0, 0);
361
362 reset_global_counters();
363 lttngtop.nbproc = 0;
364 lttngtop.nbthreads = 0;
365 lttngtop.nbfiles = 0;
366
367 lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
368 g_direct_equal);
369 lttngtop.process_table = g_ptr_array_new();
370 lttngtop.files_table = g_ptr_array_new();
371 lttngtop.cpu_table = g_ptr_array_new();
372 }
373
374 void usage(FILE *fp)
375 {
376 fprintf(fp, "LTTngTop %s\n\n", VERSION);
377 fprintf(fp, "Usage : lttngtop /path/to/trace\n");
378 }
379
380 /*
381 * Return 0 if caller should continue, < 0 if caller should return
382 * error, > 0 if caller should exit without reporting error.
383 */
384 static int parse_options(int argc, char **argv)
385 {
386 poptContext pc;
387 int opt, ret = 0;
388
389 pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
390 poptReadDefaultConfig(pc, 0);
391
392 while ((opt = poptGetNextOpt(pc)) != -1) {
393 switch (opt) {
394 case OPT_HELP:
395 usage(stdout);
396 ret = 1; /* exit cleanly */
397 goto end;
398 case OPT_TEXTDUMP:
399 opt_textdump = 1;
400 goto end;
401 default:
402 ret = -EINVAL;
403 goto end;
404 }
405 }
406
407 opt_input_path = poptGetArg(pc);
408
409 end:
410 if (pc) {
411 poptFreeContext(pc);
412 }
413 return ret;
414 }
415
416 void iter_trace(struct bt_context *bt_ctx)
417 {
418 struct bt_ctf_iter *iter;
419 struct bt_iter_pos begin_pos;
420 const struct bt_ctf_event *event;
421 int ret = 0;
422
423 begin_pos.type = BT_SEEK_BEGIN;
424 iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
425
426 if (opt_textdump) {
427 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
428 print_timestamp,
429 NULL, NULL, NULL);
430 } else {
431 /* at each event check if we need to refresh */
432 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
433 check_timestamp,
434 NULL, NULL, NULL);
435 /* at each event, verify the status of the process table */
436 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
437 fix_process_table,
438 NULL, NULL, NULL);
439 /* to handle the scheduling events */
440 bt_ctf_iter_add_callback(iter,
441 g_quark_from_static_string("sched_switch"),
442 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
443 /* to clean up the process table */
444 bt_ctf_iter_add_callback(iter,
445 g_quark_from_static_string("sched_process_free"),
446 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
447 /* to get all the process from the statedumps */
448 bt_ctf_iter_add_callback(iter,
449 g_quark_from_static_string(
450 "lttng_statedump_process_state"),
451 NULL, 0, handle_statedump_process_state,
452 NULL, NULL, NULL);
453
454 /* for IO top */
455 bt_ctf_iter_add_callback(iter,
456 g_quark_from_static_string("exit_syscall"),
457 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
458 bt_ctf_iter_add_callback(iter,
459 g_quark_from_static_string("sys_write"),
460 NULL, 0, handle_sys_write, NULL, NULL, NULL);
461 bt_ctf_iter_add_callback(iter,
462 g_quark_from_static_string("sys_read"),
463 NULL, 0, handle_sys_read, NULL, NULL, NULL);
464 bt_ctf_iter_add_callback(iter,
465 g_quark_from_static_string("sys_open"),
466 NULL, 0, handle_sys_open, NULL, NULL, NULL);
467 bt_ctf_iter_add_callback(iter,
468 g_quark_from_static_string("sys_close"),
469 NULL, 0, handle_sys_close, NULL, NULL, NULL);
470 bt_ctf_iter_add_callback(iter,
471 g_quark_from_static_string(
472 "lttng_statedump_file_descriptor"),
473 NULL, 0, handle_statedump_file_descriptor,
474 NULL, NULL, NULL);
475 }
476
477 while (((event = bt_ctf_iter_read_event(iter)) != NULL)) {
478 if (quit)
479 goto end_iter;
480 ret = bt_iter_next(bt_ctf_get_iter(iter));
481 if (ret < 0)
482 goto end_iter;
483 }
484
485 /* block until quit, we reached the end of the trace */
486 sem_wait(&end_trace_sem);
487
488 end_iter:
489 bt_ctf_iter_destroy(iter);
490 }
491
492 /*
493 * bt_context_add_traces_recursive: Open a trace recursively
494 * (copied from BSD code in converter/babeltrace.c)
495 *
496 * Find each trace present in the subdirectory starting from the given
497 * path, and add them to the context. The packet_seek parameter can be
498 * NULL: this specify to use the default format packet_seek.
499 *
500 * Return: 0 on success, nonzero on failure.
501 * Unable to open toplevel: failure.
502 * Unable to open some subdirectory or file: warn and continue;
503 */
504 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
505 const char *format_str,
506 void (*packet_seek)(struct bt_stream_pos *pos,
507 size_t offset, int whence))
508 {
509 FTS *tree;
510 FTSENT *node;
511 GArray *trace_ids;
512 char lpath[PATH_MAX];
513 char * const paths[2] = { lpath, NULL };
514 int ret = -1;
515
516 /*
517 * Need to copy path, because fts_open can change it.
518 * It is the pointer array, not the strings, that are constant.
519 */
520 strncpy(lpath, path, PATH_MAX);
521 lpath[PATH_MAX - 1] = '\0';
522
523 tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
524 if (tree == NULL) {
525 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
526 path);
527 return -EINVAL;
528 }
529
530 trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
531
532 while ((node = fts_read(tree))) {
533 int dirfd, metafd;
534
535 if (!(node->fts_info & FTS_D))
536 continue;
537
538 dirfd = open(node->fts_accpath, 0);
539 if (dirfd < 0) {
540 fprintf(stderr, "[error] [Context] Unable to open trace "
541 "directory file descriptor.\n");
542 ret = dirfd;
543 goto error;
544 }
545 metafd = openat(dirfd, "metadata", O_RDONLY);
546 if (metafd < 0) {
547 close(dirfd);
548 ret = -1;
549 continue;
550 } else {
551 int trace_id;
552
553 ret = close(metafd);
554 if (ret < 0) {
555 perror("close");
556 goto error;
557 }
558 ret = close(dirfd);
559 if (ret < 0) {
560 perror("close");
561 goto error;
562 }
563
564 trace_id = bt_context_add_trace(ctx,
565 node->fts_accpath, format_str,
566 packet_seek, NULL, NULL);
567 if (trace_id < 0) {
568 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
569 "for reading.\n", node->fts_accpath, path);
570 /* Allow to skip erroneous traces. */
571 continue;
572 }
573 g_array_append_val(trace_ids, trace_id);
574 }
575 }
576
577 g_array_free(trace_ids, TRUE);
578 return ret;
579
580 error:
581 return ret;
582 }
583
584 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
585 int field_cnt, int *tid_check, int *pid_check,
586 int *procname_check, int *ppid_check)
587 {
588 int j;
589 struct perfcounter *global;
590 const char *name;
591
592 for (j = 0; j < field_cnt; j++) {
593 name = bt_ctf_get_decl_field_name(field_list[j]);
594 if (*tid_check == 0) {
595 if (strncmp(name, "tid", 3) == 0)
596 (*tid_check)++;
597 }
598 if (*pid_check == 0) {
599 if (strncmp(name, "pid", 3) == 0)
600 (*pid_check)++;
601 }
602 if (*ppid_check == 0) {
603 if (strncmp(name, "ppid", 4) == 0)
604 (*ppid_check)++;
605 }
606 if (*procname_check == 0) {
607 if (strncmp(name, "procname", 8) == 0)
608 (*procname_check)++;
609 }
610 if (strncmp(name, "perf_", 5) == 0) {
611 global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
612 if (!global) {
613 global = g_new0(struct perfcounter, 1);
614 /* by default, sort on the first perf context */
615 if (g_hash_table_size(global_perf_liszt) == 0)
616 global->sort = 1;
617 global->visible = 1;
618 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
619 }
620 }
621 }
622
623 if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
624 *procname_check == 1)
625 return 0;
626
627 return -1;
628 }
629
630 /*
631 * check_requirements: check if the required context informations are available
632 *
633 * If each mandatory context information is available for at least in one
634 * event, return 0 otherwise return -1.
635 */
636 int check_requirements(struct bt_context *ctx)
637 {
638 unsigned int i, evt_cnt, field_cnt;
639 struct bt_ctf_event_decl *const * evt_list;
640 const struct bt_ctf_field_decl *const * field_list;
641 int tid_check = 0;
642 int pid_check = 0;
643 int procname_check = 0;
644 int ppid_check = 0;
645 int ret = 0;
646
647 bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
648 for (i = 0; i < evt_cnt; i++) {
649 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
650 &field_list, &field_cnt);
651 ret = check_field_requirements(field_list, field_cnt,
652 &tid_check, &pid_check, &procname_check,
653 &ppid_check);
654
655 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
656 &field_list, &field_cnt);
657 ret = check_field_requirements(field_list, field_cnt,
658 &tid_check, &pid_check, &procname_check,
659 &ppid_check);
660
661 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
662 &field_list, &field_cnt);
663 ret = check_field_requirements(field_list, field_cnt,
664 &tid_check, &pid_check, &procname_check,
665 &ppid_check);
666 }
667
668 if (tid_check == 0) {
669 ret = -1;
670 fprintf(stderr, "[error] missing tid context information\n");
671 }
672 if (pid_check == 0) {
673 ret = -1;
674 fprintf(stderr, "[error] missing pid context information\n");
675 }
676 if (ppid_check == 0) {
677 ret = -1;
678 fprintf(stderr, "[error] missing ppid context information\n");
679 }
680 if (procname_check == 0) {
681 ret = -1;
682 fprintf(stderr, "[error] missing procname context information\n");
683 }
684
685 return ret;
686 }
687
688 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
689 struct lttng_consumer_local_data *ctx)
690 {
691 unsigned long len;
692 int err;
693 long ret = 0;
694 int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
695
696 if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
697 /* Get the next subbuffer */
698 err = helper_kernctl_get_next_subbuf(infd);
699 if (err != 0) {
700 ret = errno;
701 perror("Reserving sub buffer failed (everything is normal, "
702 "it is due to concurrency)");
703 goto end;
704 }
705 /* read the whole subbuffer */
706 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
707 if (err != 0) {
708 ret = errno;
709 perror("Getting sub-buffer len failed.");
710 goto end;
711 }
712
713 /* splice the subbuffer to the tracefile */
714 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
715 if (ret < 0) {
716 /*
717 * display the error but continue processing to try
718 * to release the subbuffer
719 */
720 fprintf(stderr,"Error splicing to tracefile\n");
721 }
722 err = helper_kernctl_put_next_subbuf(infd);
723 if (err != 0) {
724 ret = errno;
725 perror("Reserving sub buffer failed (everything is normal, "
726 "it is due to concurrency)");
727 goto end;
728 }
729 sem_post(&metadata_available);
730 }
731
732 end:
733 return 0;
734 }
735
736 int on_update_fd(int key, uint32_t state)
737 {
738 /* let the lib handle the metadata FD */
739 if (key == sessiond_metadata)
740 return 0;
741 return 1;
742 }
743
744 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
745 {
746 int ret;
747 struct mmap_stream *new_mmap_stream;
748
749 /* Opening the tracefile in write mode */
750 if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
751 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
752 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
753 if (ret < 0) {
754 perror("open");
755 goto end;
756 }
757 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
758 }
759
760 if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
761 new_mmap_stream = malloc(sizeof(struct mmap_stream));
762 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
763 kconsumerd_fd);
764 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
765
766 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
767 /* keep mmap FDs internally */
768 ret = 1;
769 } else {
770 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
771 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
772 ret = 0;
773 }
774
775 end:
776 return ret;
777 }
778
779 void live_consume(struct bt_context **bt_ctx)
780 {
781 int ret;
782
783 if (!metadata_ready) {
784 sem_wait(&metadata_available);
785 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
786 fprintf(stderr,"no metadata\n");
787 goto end;
788 }
789 metadata_ready = 1;
790 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
791 }
792
793 if (!trace_opened) {
794 *bt_ctx = bt_context_create();
795 ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
796 lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
797 if (ret < 0) {
798 printf("Error adding trace\n");
799 goto end;
800 }
801 trace_opened = 1;
802 }
803
804 end:
805 return;
806 }
807
808 int setup_consumer(char *command_sock_path, pthread_t *threads,
809 struct lttng_consumer_local_data *ctx)
810 {
811 int ret = 0;
812
813 ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
814 read_subbuffer, NULL, on_recv_fd, on_update_fd);
815 if (!ctx)
816 goto end;
817
818 unlink(command_sock_path);
819 helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
820 helper_lttng_consumer_init();
821
822 /* Create the thread to manage the receive of fd */
823 ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
824 (void *) ctx);
825 if (ret != 0) {
826 perror("pthread_create receive fd");
827 goto end;
828 }
829 /* Create thread to manage the polling/writing of traces */
830 ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
831 (void *) ctx);
832 if (ret != 0) {
833 perror("pthread_create poll fd");
834 goto end;
835 }
836
837 end:
838 return ret;
839 }
840
841 void *setup_live_tracing()
842 {
843 struct lttng_domain dom;
844 struct lttng_channel chan;
845 char *channel_name = "mmapchan";
846 struct lttng_event ev;
847 int ret = 0;
848 char *command_sock_path = "/tmp/consumerd_sock";
849 static pthread_t threads[2]; /* recv_fd, poll */
850 struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
851
852 struct lttng_handle *handle;
853
854 BT_INIT_LIST_HEAD(&mmap_list.head);
855
856 lttng_consumer_stream_array = g_ptr_array_new();
857
858 if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
859 fprintf(stderr,"error setting up consumer\n");
860 goto end;
861 }
862
863 available_snapshots = g_ptr_array_new();
864
865 /* setup the session */
866 dom.type = LTTNG_DOMAIN_KERNEL;
867
868 ret = unlink("/tmp/livesession");
869
870 lttng_destroy_session("test");
871 if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
872 fprintf(stderr,"error creating the session : %s\n",
873 helper_lttcomm_get_readable_code(ret));
874 goto end;
875 }
876
877 if ((handle = lttng_create_handle("test", &dom)) == NULL) {
878 fprintf(stderr,"error creating handle\n");
879 goto end;
880 }
881
882 if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
883 fprintf(stderr,"error registering consumer : %s\n",
884 helper_lttcomm_get_readable_code(ret));
885 goto end;
886 }
887
888 strcpy(chan.name, channel_name);
889 chan.attr.overwrite = 0;
890 // chan.attr.subbuf_size = 32768;
891 chan.attr.subbuf_size = 1048576; /* 1MB */
892 chan.attr.num_subbuf = 4;
893 chan.attr.switch_timer_interval = 0;
894 chan.attr.read_timer_interval = 200;
895 chan.attr.output = LTTNG_EVENT_MMAP;
896
897 if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
898 fprintf(stderr,"error creating channel : %s\n",
899 helper_lttcomm_get_readable_code(ret));
900 goto end;
901 }
902
903 memset(&ev, '\0', sizeof(struct lttng_event));
904 //sprintf(ev.name, "sched_switch");
905 ev.type = LTTNG_EVENT_TRACEPOINT;
906 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
907 fprintf(stderr,"error enabling event : %s\n",
908 helper_lttcomm_get_readable_code(ret));
909 goto end;
910 }
911
912 ev.type = LTTNG_EVENT_SYSCALL;
913 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
914 fprintf(stderr,"error enabling syscalls : %s\n",
915 helper_lttcomm_get_readable_code(ret));
916 goto end;
917 }
918
919 kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
920 lttng_add_context(handle, &kctxpid, NULL, NULL);
921 kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
922 lttng_add_context(handle, &kctxppid, NULL, NULL);
923 kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
924 lttng_add_context(handle, &kctxcomm, NULL, NULL);
925 kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
926 lttng_add_context(handle, &kctxtid, NULL, NULL);
927
928 if ((ret = lttng_start_tracing("test")) < 0) {
929 fprintf(stderr,"error starting tracing : %s\n",
930 helper_lttcomm_get_readable_code(ret));
931 goto end;
932 }
933
934 helper_kernctl_buffer_flush(consumerd_metadata);
935
936 /* block until metadata is ready */
937 sem_init(&metadata_available, 0, 0);
938
939 end:
940 return NULL;
941 }
942
943 int main(int argc, char **argv)
944 {
945 int ret;
946 struct bt_context *bt_ctx = NULL;
947
948 ret = parse_options(argc, argv);
949 if (ret < 0) {
950 fprintf(stdout, "Error parsing options.\n\n");
951 usage(stdout);
952 exit(EXIT_FAILURE);
953 } else if (ret > 0) {
954 exit(EXIT_SUCCESS);
955 }
956
957 if (!opt_input_path) {
958 setup_live_tracing();
959 init_lttngtop();
960 if (!opt_textdump) {
961 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
962 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
963 }
964 live_consume(&bt_ctx);
965 iter_trace(bt_ctx);
966
967 pthread_join(timer_thread, NULL);
968 quit = 1;
969 pthread_join(display_thread, NULL);
970
971 lttng_stop_tracing("test");
972 lttng_destroy_session("test");
973
974 goto end;
975 } else {
976 init_lttngtop();
977
978 bt_ctx = bt_context_create();
979 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
980 if (ret < 0) {
981 fprintf(stderr, "[error] Opening the trace\n");
982 goto end;
983 }
984
985 ret = check_requirements(bt_ctx);
986 if (ret < 0) {
987 fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
988 goto end;
989 }
990 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
991 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
992
993 iter_trace(bt_ctx);
994
995 pthread_join(display_thread, NULL);
996 quit = 1;
997 pthread_join(timer_thread, NULL);
998 }
999
1000 end:
1001 if (bt_ctx)
1002 bt_context_put(bt_ctx);
1003
1004 return 0;
1005 }
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