pretty printing textdump
[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 static int opt_textdump;
55 static int opt_child;
56
57 int quit = 0;
58
59 struct lttngtop *copy;
60 pthread_t display_thread;
61 pthread_t timer_thread;
62
63 unsigned long refresh_display = 1 * NSEC_PER_SEC;
64 unsigned long last_display_update = 0;
65
66 /* list of FDs available for being read with snapshots */
67 struct mmap_stream_list mmap_list;
68 GPtrArray *lttng_consumer_stream_array;
69 int sessiond_metadata, consumerd_metadata;
70 struct lttng_consumer_local_data *ctx = NULL;
71 /* list of snapshots currently not consumed */
72 GPtrArray *available_snapshots;
73 sem_t metadata_available;
74 int reload_trace = 0;
75
76 int last_textdump_print_newline = 1;
77
78 enum {
79 OPT_NONE = 0,
80 OPT_HELP,
81 OPT_TEXTDUMP,
82 OPT_PID,
83 OPT_CHILD,
84 OPT_HOSTNAME,
85 };
86
87 static struct poptOption long_options[] = {
88 /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
89 { "help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL },
90 { "textdump", 't', POPT_ARG_NONE, NULL, OPT_TEXTDUMP, NULL, NULL },
91 { "child", 'f', POPT_ARG_NONE, NULL, OPT_CHILD, NULL, NULL },
92 { "pid", 'p', POPT_ARG_STRING, &opt_tid, OPT_PID, NULL, NULL },
93 { "hostname", 'n', POPT_ARG_STRING, &opt_hostname, OPT_HOSTNAME, NULL, NULL },
94 { NULL, 0, 0, NULL, 0, NULL, NULL },
95 };
96
97 static void handle_textdump_sigterm(int signal)
98 {
99 quit = 1;
100 lttng_destroy_session("test");
101 }
102
103 void *refresh_thread(void *p)
104 {
105 struct mmap_stream *mmap_info;
106
107 while (1) {
108 if (quit) {
109 sem_post(&pause_sem);
110 sem_post(&timer);
111 sem_post(&end_trace_sem);
112 sem_post(&goodtodisplay);
113 sem_post(&goodtoupdate);
114 pthread_exit(0);
115 }
116 if (!opt_input_path) {
117 bt_list_for_each_entry(mmap_info, &mmap_list.head, list)
118 helper_kernctl_buffer_flush(mmap_info->fd);
119 }
120 sem_wait(&pause_sem);
121 sem_post(&pause_sem);
122 sem_post(&timer);
123 sleep(refresh_display/NSEC_PER_SEC);
124 }
125 }
126
127 void *ncurses_display(void *p)
128 {
129 unsigned int current_display_index = 0;
130
131 sem_wait(&bootstrap);
132 /*
133 * Prevent the 1 second delay when we hit ESC
134 */
135 ESCDELAY = 0;
136 init_ncurses();
137
138 while (1) {
139 sem_wait(&timer);
140 sem_wait(&goodtodisplay);
141 sem_wait(&pause_sem);
142
143 if (quit) {
144 sem_post(&pause_sem);
145 sem_post(&timer);
146 reset_ncurses();
147 pthread_exit(0);
148 }
149
150 copy = g_ptr_array_index(copies, current_display_index);
151 assert(copy);
152 display(current_display_index++);
153
154 sem_post(&goodtoupdate);
155 sem_post(&pause_sem);
156 }
157 }
158
159 void print_fields(struct bt_ctf_event *event)
160 {
161 unsigned int cnt, i;
162 const struct definition *const * list;
163 const struct definition *scope;
164 enum ctf_type_id type;
165 const char *str;
166
167 scope = bt_ctf_get_top_level_scope(event, BT_EVENT_FIELDS);
168
169 bt_ctf_get_field_list(event, scope, &list, &cnt);
170 for (i = 0; i < cnt; i++) {
171 if (i != 0)
172 printf(", ");
173 printf("%s = ", bt_ctf_field_name(list[i]));
174 type = bt_ctf_field_type(list[i]);
175 if (type == CTF_TYPE_INTEGER) {
176 if (bt_ctf_get_int_signedness(list[i]) == 0)
177 printf("%" PRIu64 "", bt_ctf_get_uint64(list[i]));
178 else
179 printf("%" PRId64 "", bt_ctf_get_int64(list[i]));
180 } else if (type == CTF_TYPE_STRING) {
181 printf("%s", bt_ctf_get_string(list[i]));
182 } else if (type == CTF_TYPE_ARRAY) {
183 str = bt_ctf_get_char_array(list[i]);
184 if (str)
185 printf("%s", str);
186 }
187 }
188 }
189
190 /*
191 * hook on each event to check the timestamp and refresh the display if
192 * necessary
193 */
194 enum bt_cb_ret print_timestamp(struct bt_ctf_event *call_data, void *private_data)
195 {
196 unsigned long timestamp;
197 struct tm start;
198 uint64_t ts_nsec_start;
199 int pid, cpu_id;
200 int64_t syscall_ret;
201 const struct definition *scope;
202 const char *hostname, *procname;
203
204 timestamp = bt_ctf_get_timestamp(call_data);
205
206 start = format_timestamp(timestamp);
207 ts_nsec_start = timestamp % NSEC_PER_SEC;
208
209 pid = get_context_pid(call_data);
210 if (pid == -1ULL && opt_tid) {
211 goto error;
212 }
213
214 hostname = get_context_hostname(call_data);
215 if (!opt_tid && (opt_hostname && !lookup_hostname_list(hostname)))
216 goto end;
217 if (!opt_hostname && (opt_tid && !lookup_tid_list(pid)))
218 goto end;
219 if ((opt_tid && !lookup_tid_list(pid)) &&
220 (opt_hostname && !lookup_hostname_list(hostname)))
221 goto end;
222
223 cpu_id = get_cpu_id(call_data);
224 procname = get_context_comm(call_data);
225
226 if (strcmp(bt_ctf_event_name(call_data), "exit_syscall") == 0) {
227 scope = bt_ctf_get_top_level_scope(call_data,
228 BT_EVENT_FIELDS);
229 syscall_ret = bt_ctf_get_int64(bt_ctf_get_field(call_data,
230 scope, "_ret"));
231 printf("= %ld\n", syscall_ret);
232 last_textdump_print_newline = 1;
233 } else {
234 /* we might have lost the exit_syscall event, so need to
235 * print the newline in this case */
236 if (last_textdump_print_newline == 0)
237 printf("\n");
238 printf("%02d:%02d:%02d.%09" PRIu64 " (%s) (cpu %d) [%s (%d)] %s (",
239 start.tm_hour, start.tm_min, start.tm_sec,
240 ts_nsec_start, hostname, cpu_id, procname, pid,
241 bt_ctf_event_name(call_data));
242 print_fields(call_data);
243 printf(") ");
244 /*
245 if (strncmp(bt_ctf_event_name(call_data), "sys_", 4) == 0) {
246 } else {
247 printf("\n");
248 }
249 */
250 last_textdump_print_newline = 0;
251 }
252
253 end:
254 return BT_CB_OK;
255 error:
256 return BT_CB_ERROR_STOP;
257 }
258
259 /*
260 * hook on each event to check the timestamp and refresh the display if
261 * necessary
262 */
263 enum bt_cb_ret check_timestamp(struct bt_ctf_event *call_data, void *private_data)
264 {
265 unsigned long timestamp;
266
267 timestamp = bt_ctf_get_timestamp(call_data);
268 if (timestamp == -1ULL)
269 goto error;
270
271 if (last_display_update == 0)
272 last_display_update = timestamp;
273
274 if (timestamp - last_display_update >= refresh_display) {
275 sem_wait(&goodtoupdate);
276 g_ptr_array_add(copies, get_copy_lttngtop(last_display_update,
277 timestamp));
278 sem_post(&goodtodisplay);
279 sem_post(&bootstrap);
280 last_display_update = timestamp;
281 }
282 return BT_CB_OK;
283
284 error:
285 fprintf(stderr, "check_timestamp callback error\n");
286 return BT_CB_ERROR_STOP;
287 }
288
289 /*
290 * get_perf_counter : get or create and return a perf_counter struct for
291 * either a process or a cpu (only one of the 2 parameters mandatory)
292 */
293 struct perfcounter *get_perf_counter(const char *name, struct processtop *proc,
294 struct cputime *cpu)
295 {
296 struct perfcounter *ret;
297 GHashTable *table;
298
299 if (proc)
300 table = proc->perf;
301 else if (cpu)
302 table = cpu->perf;
303 else
304 goto error;
305
306 ret = g_hash_table_lookup(table, (gpointer) name);
307 if (ret)
308 goto end;
309
310 ret = g_new0(struct perfcounter, 1);
311 /* by default, make it visible in the UI */
312 ret->visible = 1;
313 g_hash_table_insert(table, (gpointer) strdup(name), ret);
314
315 end:
316 return ret;
317
318 error:
319 return NULL;
320 }
321
322 void update_perf_value(struct processtop *proc, struct cputime *cpu,
323 const char *name, int value)
324 {
325 struct perfcounter *cpu_perf, *process_perf;
326
327 cpu_perf = get_perf_counter(name, NULL, cpu);
328 if (cpu_perf->count < value) {
329 process_perf = get_perf_counter(name, proc, NULL);
330 process_perf->count += value - cpu_perf->count;
331 cpu_perf->count = value;
332 }
333 }
334
335 void extract_perf_counter_scope(const struct bt_ctf_event *event,
336 const struct bt_definition *scope,
337 struct processtop *proc,
338 struct cputime *cpu)
339 {
340 struct bt_definition const * const *list = NULL;
341 const struct bt_definition *field;
342 unsigned int count;
343 struct perfcounter *perfcounter;
344 GHashTableIter iter;
345 gpointer key;
346 int ret;
347
348 if (!scope)
349 goto end;
350
351 ret = bt_ctf_get_field_list(event, scope, &list, &count);
352 if (ret < 0)
353 goto end;
354
355 if (count == 0)
356 goto end;
357
358 g_hash_table_iter_init(&iter, global_perf_liszt);
359 while (g_hash_table_iter_next (&iter, &key, (gpointer) &perfcounter)) {
360 field = bt_ctf_get_field(event, scope, (char *) key);
361 if (field) {
362 int value = bt_ctf_get_uint64(field);
363 if (bt_ctf_field_get_error())
364 continue;
365 update_perf_value(proc, cpu, (char *) key, value);
366 }
367 }
368
369 end:
370 return;
371 }
372
373 void update_perf_counter(struct processtop *proc, const struct bt_ctf_event *event)
374 {
375 struct cputime *cpu;
376 const struct bt_definition *scope;
377
378 cpu = get_cpu(get_cpu_id(event));
379
380 scope = bt_ctf_get_top_level_scope(event, BT_STREAM_EVENT_CONTEXT);
381 extract_perf_counter_scope(event, scope, proc, cpu);
382
383 scope = bt_ctf_get_top_level_scope(event, BT_STREAM_PACKET_CONTEXT);
384 extract_perf_counter_scope(event, scope, proc, cpu);
385
386 scope = bt_ctf_get_top_level_scope(event, BT_EVENT_CONTEXT);
387 extract_perf_counter_scope(event, scope, proc, cpu);
388 }
389
390 enum bt_cb_ret fix_process_table(struct bt_ctf_event *call_data,
391 void *private_data)
392 {
393 int pid, tid, ppid, vpid, vtid, vppid;
394 char *comm, *hostname;
395 struct processtop *parent, *child;
396 unsigned long timestamp;
397
398 timestamp = bt_ctf_get_timestamp(call_data);
399 if (timestamp == -1ULL)
400 goto error;
401
402 pid = get_context_pid(call_data);
403 if (pid == -1ULL) {
404 goto error;
405 }
406
407 tid = get_context_tid(call_data);
408 if (tid == -1ULL) {
409 goto error;
410 }
411 ppid = get_context_ppid(call_data);
412 if (ppid == -1ULL) {
413 goto error;
414 }
415 vpid = get_context_vpid(call_data);
416 if (pid == -1ULL) {
417 vpid = -1;
418 }
419 vtid = get_context_vtid(call_data);
420 if (tid == -1ULL) {
421 vtid = -1;
422 }
423 vppid = get_context_vppid(call_data);
424 if (ppid == -1ULL) {
425 vppid = -1;
426 }
427 comm = get_context_comm(call_data);
428 if (!comm) {
429 goto error;
430 }
431 /* optional */
432 hostname = get_context_hostname(call_data);
433
434 /* find or create the current process */
435 child = find_process_tid(&lttngtop, tid, comm);
436 if (!child)
437 child = add_proc(&lttngtop, tid, comm, timestamp);
438 if (!child)
439 goto end;
440 update_proc(child, pid, tid, ppid, vpid, vtid, vppid, comm, hostname);
441
442 if (pid != tid) {
443 /* find or create the parent */
444 parent = find_process_tid(&lttngtop, pid, comm);
445 if (!parent) {
446 parent = add_proc(&lttngtop, pid, comm, timestamp);
447 if (parent)
448 parent->pid = pid;
449 }
450
451 /* attach the parent to the current process */
452 child->threadparent = parent;
453 add_thread(parent, child);
454 }
455
456 update_perf_counter(child, call_data);
457
458 end:
459 return BT_CB_OK;
460
461 error:
462 return BT_CB_ERROR_STOP;
463 }
464
465 void init_lttngtop()
466 {
467 copies = g_ptr_array_new();
468 global_perf_liszt = g_hash_table_new(g_str_hash, g_str_equal);
469
470 sem_init(&goodtodisplay, 0, 0);
471 sem_init(&goodtoupdate, 0, 1);
472 sem_init(&timer, 0, 1);
473 sem_init(&bootstrap, 0, 0);
474 sem_init(&pause_sem, 0, 1);
475 sem_init(&end_trace_sem, 0, 0);
476
477 reset_global_counters();
478 lttngtop.nbproc = 0;
479 lttngtop.nbthreads = 0;
480 lttngtop.nbfiles = 0;
481
482 lttngtop.process_hash_table = g_hash_table_new(g_direct_hash,
483 g_direct_equal);
484 lttngtop.process_table = g_ptr_array_new();
485 lttngtop.files_table = g_ptr_array_new();
486 lttngtop.cpu_table = g_ptr_array_new();
487 }
488
489 void usage(FILE *fp)
490 {
491 fprintf(fp, "LTTngTop %s\n\n", VERSION);
492 fprintf(fp, "Usage : lttngtop [OPTIONS] [TRACE]\n");
493 fprintf(fp, " TRACE Path to the trace to analyse (no trace path for live tracing)\n");
494 fprintf(fp, " -h, --help This help message\n");
495 fprintf(fp, " -t, --textdump Display live events in text-only\n");
496 fprintf(fp, " -p, --pid Comma-separated list of PIDs to display\n");
497 fprintf(fp, " -f, --child Follow threads associated with selected PIDs\n");
498 fprintf(fp, " -n, --hostname Comma-separated list of hostnames to display (require hostname context in trace)\n");
499 }
500
501 /*
502 * Return 0 if caller should continue, < 0 if caller should return
503 * error, > 0 if caller should exit without reporting error.
504 */
505 static int parse_options(int argc, char **argv)
506 {
507 poptContext pc;
508 int opt, ret = 0;
509 char *tmp_str;
510 int *tid;
511
512 pc = poptGetContext(NULL, argc, (const char **) argv, long_options, 0);
513 poptReadDefaultConfig(pc, 0);
514
515 while ((opt = poptGetNextOpt(pc)) != -1) {
516 switch (opt) {
517 case OPT_HELP:
518 usage(stdout);
519 ret = 1; /* exit cleanly */
520 goto end;
521 case OPT_TEXTDUMP:
522 opt_textdump = 1;
523 break;
524 case OPT_CHILD:
525 opt_textdump = 1;
526 opt_child = 1;
527 break;
528 case OPT_PID:
529 tid_list = g_hash_table_new(g_str_hash,
530 g_str_equal);
531 tmp_str = strtok(opt_tid, ",");
532 while (tmp_str) {
533 tid = malloc(sizeof(int));
534 *tid = atoi(tmp_str);
535 g_hash_table_insert(tid_list,
536 (gpointer) tid, tid);
537 tmp_str = strtok(NULL, ",");
538 }
539 break;
540 case OPT_HOSTNAME:
541 hostname_list = g_hash_table_new(g_str_hash,
542 g_str_equal);
543 tmp_str = strtok(opt_hostname, ",");
544 while (tmp_str) {
545 char *new_str = strdup(tmp_str);
546 g_hash_table_insert(hostname_list,
547 (gpointer) new_str,
548 (gpointer) new_str);
549 tmp_str = strtok(NULL, ",");
550 }
551 break;
552 default:
553 ret = -EINVAL;
554 goto end;
555 }
556 }
557
558 opt_input_path = poptGetArg(pc);
559
560 end:
561 if (pc) {
562 poptFreeContext(pc);
563 }
564 return ret;
565 }
566
567 void iter_trace(struct bt_context *bt_ctx)
568 {
569 struct bt_ctf_iter *iter;
570 struct bt_iter_pos begin_pos;
571 const struct bt_ctf_event *event;
572 int ret = 0;
573
574 begin_pos.type = BT_SEEK_BEGIN;
575 iter = bt_ctf_iter_create(bt_ctx, &begin_pos, NULL);
576
577 if (opt_textdump) {
578 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
579 print_timestamp,
580 NULL, NULL, NULL);
581 } else {
582 /* at each event check if we need to refresh */
583 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
584 check_timestamp,
585 NULL, NULL, NULL);
586 /* at each event, verify the status of the process table */
587 bt_ctf_iter_add_callback(iter, 0, NULL, 0,
588 fix_process_table,
589 NULL, NULL, NULL);
590 /* to handle the scheduling events */
591 bt_ctf_iter_add_callback(iter,
592 g_quark_from_static_string("sched_switch"),
593 NULL, 0, handle_sched_switch, NULL, NULL, NULL);
594 /* to clean up the process table */
595 bt_ctf_iter_add_callback(iter,
596 g_quark_from_static_string("sched_process_free"),
597 NULL, 0, handle_sched_process_free, NULL, NULL, NULL);
598 /* to get all the process from the statedumps */
599 bt_ctf_iter_add_callback(iter,
600 g_quark_from_static_string(
601 "lttng_statedump_process_state"),
602 NULL, 0, handle_statedump_process_state,
603 NULL, NULL, NULL);
604
605 /* for IO top */
606 bt_ctf_iter_add_callback(iter,
607 g_quark_from_static_string("exit_syscall"),
608 NULL, 0, handle_exit_syscall, NULL, NULL, NULL);
609 bt_ctf_iter_add_callback(iter,
610 g_quark_from_static_string("sys_write"),
611 NULL, 0, handle_sys_write, NULL, NULL, NULL);
612 bt_ctf_iter_add_callback(iter,
613 g_quark_from_static_string("sys_read"),
614 NULL, 0, handle_sys_read, NULL, NULL, NULL);
615 bt_ctf_iter_add_callback(iter,
616 g_quark_from_static_string("sys_open"),
617 NULL, 0, handle_sys_open, NULL, NULL, NULL);
618 bt_ctf_iter_add_callback(iter,
619 g_quark_from_static_string("sys_close"),
620 NULL, 0, handle_sys_close, NULL, NULL, NULL);
621 bt_ctf_iter_add_callback(iter,
622 g_quark_from_static_string(
623 "lttng_statedump_file_descriptor"),
624 NULL, 0, handle_statedump_file_descriptor,
625 NULL, NULL, NULL);
626 }
627
628 while ((event = bt_ctf_iter_read_event(iter, NULL)) != NULL) {
629 if (quit || reload_trace)
630 goto end_iter;
631 ret = bt_iter_next(bt_ctf_get_iter(iter));
632 if (ret < 0)
633 goto end_iter;
634 }
635
636 /* block until quit, we reached the end of the trace */
637 sem_wait(&end_trace_sem);
638
639 end_iter:
640 bt_ctf_iter_destroy(iter);
641 }
642
643 /*
644 * bt_context_add_traces_recursive: Open a trace recursively
645 * (copied from BSD code in converter/babeltrace.c)
646 *
647 * Find each trace present in the subdirectory starting from the given
648 * path, and add them to the context. The packet_seek parameter can be
649 * NULL: this specify to use the default format packet_seek.
650 *
651 * Return: 0 on success, nonzero on failure.
652 * Unable to open toplevel: failure.
653 * Unable to open some subdirectory or file: warn and continue;
654 */
655 int bt_context_add_traces_recursive(struct bt_context *ctx, const char *path,
656 const char *format_str,
657 void (*packet_seek)(struct bt_stream_pos *pos,
658 size_t offset, int whence))
659 {
660 FTS *tree;
661 FTSENT *node;
662 GArray *trace_ids;
663 char lpath[PATH_MAX];
664 char * const paths[2] = { lpath, NULL };
665 int ret = -1;
666
667 /*
668 * Need to copy path, because fts_open can change it.
669 * It is the pointer array, not the strings, that are constant.
670 */
671 strncpy(lpath, path, PATH_MAX);
672 lpath[PATH_MAX - 1] = '\0';
673
674 tree = fts_open(paths, FTS_NOCHDIR | FTS_LOGICAL, 0);
675 if (tree == NULL) {
676 fprintf(stderr, "[error] [Context] Cannot traverse \"%s\" for reading.\n",
677 path);
678 return -EINVAL;
679 }
680
681 trace_ids = g_array_new(FALSE, TRUE, sizeof(int));
682
683 while ((node = fts_read(tree))) {
684 int dirfd, metafd;
685
686 if (!(node->fts_info & FTS_D))
687 continue;
688
689 dirfd = open(node->fts_accpath, 0);
690 if (dirfd < 0) {
691 fprintf(stderr, "[error] [Context] Unable to open trace "
692 "directory file descriptor.\n");
693 ret = dirfd;
694 goto error;
695 }
696 metafd = openat(dirfd, "metadata", O_RDONLY);
697 if (metafd < 0) {
698 close(dirfd);
699 ret = -1;
700 continue;
701 } else {
702 int trace_id;
703
704 ret = close(metafd);
705 if (ret < 0) {
706 perror("close");
707 goto error;
708 }
709 ret = close(dirfd);
710 if (ret < 0) {
711 perror("close");
712 goto error;
713 }
714
715 trace_id = bt_context_add_trace(ctx,
716 node->fts_accpath, format_str,
717 packet_seek, NULL, NULL);
718 if (trace_id < 0) {
719 fprintf(stderr, "[warning] [Context] opening trace \"%s\" from %s "
720 "for reading.\n", node->fts_accpath, path);
721 /* Allow to skip erroneous traces. */
722 continue;
723 }
724 g_array_append_val(trace_ids, trace_id);
725 }
726 }
727
728 g_array_free(trace_ids, TRUE);
729 return ret;
730
731 error:
732 return ret;
733 }
734
735 static int check_field_requirements(const struct bt_ctf_field_decl *const * field_list,
736 int field_cnt, int *tid_check, int *pid_check,
737 int *procname_check, int *ppid_check)
738 {
739 int j;
740 struct perfcounter *global;
741 const char *name;
742
743 for (j = 0; j < field_cnt; j++) {
744 name = bt_ctf_get_decl_field_name(field_list[j]);
745 if (*tid_check == 0) {
746 if (strncmp(name, "tid", 3) == 0)
747 (*tid_check)++;
748 }
749 if (*pid_check == 0) {
750 if (strncmp(name, "pid", 3) == 0)
751 (*pid_check)++;
752 }
753 if (*ppid_check == 0) {
754 if (strncmp(name, "ppid", 4) == 0)
755 (*ppid_check)++;
756 }
757 if (*procname_check == 0) {
758 if (strncmp(name, "procname", 8) == 0)
759 (*procname_check)++;
760 }
761 if (strncmp(name, "perf_", 5) == 0) {
762 global = g_hash_table_lookup(global_perf_liszt, (gpointer) name);
763 if (!global) {
764 global = g_new0(struct perfcounter, 1);
765 /* by default, sort on the first perf context */
766 if (g_hash_table_size(global_perf_liszt) == 0)
767 global->sort = 1;
768 global->visible = 1;
769 g_hash_table_insert(global_perf_liszt, (gpointer) strdup(name), global);
770 }
771 }
772 }
773
774 if (*tid_check == 1 && *pid_check == 1 && *ppid_check == 1 &&
775 *procname_check == 1)
776 return 0;
777
778 return -1;
779 }
780
781 /*
782 * check_requirements: check if the required context informations are available
783 *
784 * If each mandatory context information is available for at least in one
785 * event, return 0 otherwise return -1.
786 */
787 int check_requirements(struct bt_context *ctx)
788 {
789 unsigned int i, evt_cnt, field_cnt;
790 struct bt_ctf_event_decl *const * evt_list;
791 const struct bt_ctf_field_decl *const * field_list;
792 int tid_check = 0;
793 int pid_check = 0;
794 int procname_check = 0;
795 int ppid_check = 0;
796 int ret = 0;
797
798 bt_ctf_get_event_decl_list(0, ctx, &evt_list, &evt_cnt);
799 for (i = 0; i < evt_cnt; i++) {
800 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_EVENT_CONTEXT,
801 &field_list, &field_cnt);
802 ret = check_field_requirements(field_list, field_cnt,
803 &tid_check, &pid_check, &procname_check,
804 &ppid_check);
805
806 bt_ctf_get_decl_fields(evt_list[i], BT_EVENT_CONTEXT,
807 &field_list, &field_cnt);
808 ret = check_field_requirements(field_list, field_cnt,
809 &tid_check, &pid_check, &procname_check,
810 &ppid_check);
811
812 bt_ctf_get_decl_fields(evt_list[i], BT_STREAM_PACKET_CONTEXT,
813 &field_list, &field_cnt);
814 ret = check_field_requirements(field_list, field_cnt,
815 &tid_check, &pid_check, &procname_check,
816 &ppid_check);
817 }
818
819 if (tid_check == 0) {
820 ret = -1;
821 fprintf(stderr, "[error] missing tid context information\n");
822 }
823 if (pid_check == 0) {
824 ret = -1;
825 fprintf(stderr, "[error] missing pid context information\n");
826 }
827 if (ppid_check == 0) {
828 ret = -1;
829 fprintf(stderr, "[error] missing ppid context information\n");
830 }
831 if (procname_check == 0) {
832 ret = -1;
833 fprintf(stderr, "[error] missing procname context information\n");
834 }
835
836 return ret;
837 }
838
839 ssize_t read_subbuffer(struct lttng_consumer_stream *kconsumerd_fd,
840 struct lttng_consumer_local_data *ctx)
841 {
842 unsigned long len;
843 int err;
844 long ret = 0;
845 int infd = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
846
847 if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_SPLICE) {
848 /* Get the next subbuffer */
849 err = helper_kernctl_get_next_subbuf(infd);
850 if (err != 0) {
851 ret = errno;
852 perror("Reserving sub buffer failed (everything is normal, "
853 "it is due to concurrency)");
854 goto end;
855 }
856 /* read the whole subbuffer */
857 err = helper_kernctl_get_padded_subbuf_size(infd, &len);
858 if (err != 0) {
859 ret = errno;
860 perror("Getting sub-buffer len failed.");
861 goto end;
862 }
863
864 /* splice the subbuffer to the tracefile */
865 ret = helper_lttng_consumer_on_read_subbuffer_splice(ctx, kconsumerd_fd, len);
866 if (ret < 0) {
867 /*
868 * display the error but continue processing to try
869 * to release the subbuffer
870 */
871 fprintf(stderr,"Error splicing to tracefile\n");
872 }
873 err = helper_kernctl_put_next_subbuf(infd);
874 if (err != 0) {
875 ret = errno;
876 perror("Reserving sub buffer failed (everything is normal, "
877 "it is due to concurrency)");
878 goto end;
879 }
880 sem_post(&metadata_available);
881 }
882
883 end:
884 return 0;
885 }
886
887 int on_update_fd(int key, uint32_t state)
888 {
889 /* let the lib handle the metadata FD */
890 if (key == sessiond_metadata)
891 return 0;
892 return 1;
893 }
894
895 int on_recv_fd(struct lttng_consumer_stream *kconsumerd_fd)
896 {
897 int ret;
898 struct mmap_stream *new_mmap_stream;
899
900 /* Opening the tracefile in write mode */
901 if (helper_get_lttng_consumer_stream_path_name(kconsumerd_fd) != NULL) {
902 ret = open(helper_get_lttng_consumer_stream_path_name(kconsumerd_fd),
903 O_WRONLY|O_CREAT|O_TRUNC, S_IRWXU|S_IRWXG|S_IRWXO);
904 if (ret < 0) {
905 perror("open");
906 goto end;
907 }
908 helper_set_lttng_consumer_stream_out_fd(kconsumerd_fd, ret);
909 }
910
911 if (helper_get_lttng_consumer_stream_output(kconsumerd_fd) == LTTNG_EVENT_MMAP) {
912 new_mmap_stream = malloc(sizeof(struct mmap_stream));
913 new_mmap_stream->fd = helper_get_lttng_consumer_stream_wait_fd(
914 kconsumerd_fd);
915 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
916
917 g_ptr_array_add(lttng_consumer_stream_array, kconsumerd_fd);
918 /* keep mmap FDs internally */
919 ret = 1;
920 } else {
921 consumerd_metadata = helper_get_lttng_consumer_stream_wait_fd(kconsumerd_fd);
922 sessiond_metadata = helper_get_lttng_consumer_stream_key(kconsumerd_fd);
923 ret = 0;
924 }
925
926 reload_trace = 1;
927
928 end:
929 return ret;
930 }
931
932 void live_consume(struct bt_context **bt_ctx)
933 {
934 int ret;
935 FILE *metadata_fp;
936
937 sem_wait(&metadata_available);
938 if (access("/tmp/livesession/kernel/metadata", F_OK) != 0) {
939 fprintf(stderr,"no metadata\n");
940 goto end;
941 }
942 metadata_fp = fopen("/tmp/livesession/kernel/metadata", "r");
943
944 *bt_ctx = bt_context_create();
945 ret = bt_context_add_trace(*bt_ctx, NULL, "ctf",
946 lttngtop_ctf_packet_seek, &mmap_list, metadata_fp);
947 if (ret < 0) {
948 printf("Error adding trace\n");
949 goto end;
950 }
951
952 end:
953 return;
954 }
955
956 int setup_consumer(char *command_sock_path, pthread_t *threads,
957 struct lttng_consumer_local_data *ctx)
958 {
959 int ret = 0;
960
961 ctx = helper_lttng_consumer_create(HELPER_LTTNG_CONSUMER_KERNEL,
962 read_subbuffer, NULL, on_recv_fd, on_update_fd);
963 if (!ctx)
964 goto end;
965
966 unlink(command_sock_path);
967 helper_lttng_consumer_set_command_sock_path(ctx, command_sock_path);
968 helper_lttng_consumer_init();
969
970 /* Create the thread to manage the receive of fd */
971 ret = pthread_create(&threads[0], NULL, helper_lttng_consumer_thread_receive_fds,
972 (void *) ctx);
973 if (ret != 0) {
974 perror("pthread_create receive fd");
975 goto end;
976 }
977 /* Create thread to manage the polling/writing of traces */
978 ret = pthread_create(&threads[1], NULL, helper_lttng_consumer_thread_poll_fds,
979 (void *) ctx);
980 if (ret != 0) {
981 perror("pthread_create poll fd");
982 goto end;
983 }
984
985 end:
986 return ret;
987 }
988
989 int setup_live_tracing()
990 {
991 struct lttng_domain dom;
992 struct lttng_channel chan;
993 char *channel_name = "mmapchan";
994 struct lttng_event ev;
995 int ret = 0;
996 char *command_sock_path = "/tmp/consumerd_sock";
997 static pthread_t threads[2]; /* recv_fd, poll */
998 struct lttng_event_context kctxpid, kctxcomm, kctxppid, kctxtid;
999
1000 struct lttng_handle *handle;
1001
1002 BT_INIT_LIST_HEAD(&mmap_list.head);
1003
1004 lttng_consumer_stream_array = g_ptr_array_new();
1005
1006 if ((ret = setup_consumer(command_sock_path, threads, ctx)) < 0) {
1007 fprintf(stderr,"error setting up consumer\n");
1008 goto error;
1009 }
1010
1011 available_snapshots = g_ptr_array_new();
1012
1013 /* setup the session */
1014 dom.type = LTTNG_DOMAIN_KERNEL;
1015
1016 ret = unlink("/tmp/livesession");
1017
1018 lttng_destroy_session("test");
1019 if ((ret = lttng_create_session("test", "/tmp/livesession")) < 0) {
1020 fprintf(stderr,"error creating the session : %s\n",
1021 helper_lttcomm_get_readable_code(ret));
1022 goto error;
1023 }
1024
1025 if ((handle = lttng_create_handle("test", &dom)) == NULL) {
1026 fprintf(stderr,"error creating handle\n");
1027 goto error_session;
1028 }
1029
1030 /*
1031 * FIXME : need to let the
1032 * helper_lttng_consumer_thread_receive_fds create the
1033 * socket.
1034 * Cleaner solution ?
1035 */
1036 while (access(command_sock_path, F_OK)) {
1037 sleep(0.1);
1038 }
1039
1040 if ((ret = lttng_register_consumer(handle, command_sock_path)) < 0) {
1041 fprintf(stderr,"error registering consumer : %s\n",
1042 helper_lttcomm_get_readable_code(ret));
1043 goto error_session;
1044 }
1045
1046 strcpy(chan.name, channel_name);
1047 chan.attr.overwrite = 0;
1048 if (opt_tid && opt_textdump) {
1049 chan.attr.subbuf_size = 32768;
1050 chan.attr.num_subbuf = 8;
1051 } else {
1052 chan.attr.subbuf_size = 1048576; /* 1MB */
1053 chan.attr.num_subbuf = 4;
1054 }
1055 chan.attr.switch_timer_interval = 0;
1056 chan.attr.read_timer_interval = 200;
1057 chan.attr.output = LTTNG_EVENT_MMAP;
1058
1059 if ((ret = lttng_enable_channel(handle, &chan)) < 0) {
1060 fprintf(stderr,"error creating channel : %s\n",
1061 helper_lttcomm_get_readable_code(ret));
1062 goto error_session;
1063 }
1064
1065 memset(&ev, '\0', sizeof(struct lttng_event));
1066 //sprintf(ev.name, "sched_switch");
1067 ev.type = LTTNG_EVENT_TRACEPOINT;
1068 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1069 fprintf(stderr,"error enabling event : %s\n",
1070 helper_lttcomm_get_readable_code(ret));
1071 goto error_session;
1072 }
1073
1074 ev.type = LTTNG_EVENT_SYSCALL;
1075 if ((ret = lttng_enable_event(handle, &ev, channel_name)) < 0) {
1076 fprintf(stderr,"error enabling syscalls : %s\n",
1077 helper_lttcomm_get_readable_code(ret));
1078 goto error_session;
1079 }
1080
1081 kctxpid.ctx = LTTNG_EVENT_CONTEXT_PID;
1082 lttng_add_context(handle, &kctxpid, NULL, NULL);
1083 kctxtid.ctx = LTTNG_EVENT_CONTEXT_TID;
1084 lttng_add_context(handle, &kctxtid, NULL, NULL);
1085 kctxppid.ctx = LTTNG_EVENT_CONTEXT_PPID;
1086 lttng_add_context(handle, &kctxppid, NULL, NULL);
1087 kctxcomm.ctx = LTTNG_EVENT_CONTEXT_PROCNAME;
1088 lttng_add_context(handle, &kctxcomm, NULL, NULL);
1089 kctxpid.ctx = LTTNG_EVENT_CONTEXT_VPID;
1090 lttng_add_context(handle, &kctxpid, NULL, NULL);
1091 kctxtid.ctx = LTTNG_EVENT_CONTEXT_VTID;
1092 lttng_add_context(handle, &kctxtid, NULL, NULL);
1093 kctxtid.ctx = LTTNG_EVENT_CONTEXT_HOSTNAME;
1094 lttng_add_context(handle, &kctxtid, NULL, NULL);
1095
1096 if ((ret = lttng_start_tracing("test")) < 0) {
1097 fprintf(stderr,"error starting tracing : %s\n",
1098 helper_lttcomm_get_readable_code(ret));
1099 goto error_session;
1100 }
1101
1102 helper_kernctl_buffer_flush(consumerd_metadata);
1103
1104 /* block until metadata is ready */
1105 sem_init(&metadata_available, 0, 0);
1106
1107 return 0;
1108
1109 error_session:
1110 lttng_destroy_session("test");
1111 error:
1112 return -1;
1113 }
1114
1115 int main(int argc, char **argv)
1116 {
1117 int ret;
1118 struct bt_context *bt_ctx = NULL;
1119 struct mmap_stream *mmap_info;
1120 unsigned long mmap_len;
1121
1122 ret = parse_options(argc, argv);
1123 if (ret < 0) {
1124 fprintf(stdout, "Error parsing options.\n\n");
1125 usage(stdout);
1126 exit(EXIT_FAILURE);
1127 } else if (ret > 0) {
1128 exit(EXIT_SUCCESS);
1129 }
1130
1131 if (!opt_input_path) {
1132 if (opt_textdump) {
1133 signal(SIGTERM, handle_textdump_sigterm);
1134 signal(SIGINT, handle_textdump_sigterm);
1135 }
1136 ret = setup_live_tracing();
1137 if (ret < 0) {
1138 goto end;
1139 }
1140 init_lttngtop();
1141 if (!opt_textdump) {
1142 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1143 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1144 }
1145 while (!quit) {
1146 reload_trace = 0;
1147 live_consume(&bt_ctx);
1148 iter_trace(bt_ctx);
1149 ret = bt_context_remove_trace(bt_ctx, 0);
1150 if (ret != 0)
1151 fprintf(stderr, "error removing trace\n");
1152 if (bt_ctx) {
1153 bt_context_put(bt_ctx);
1154 }
1155
1156 /*
1157 * since we receive all FDs every time there is an
1158 * update and the FD number is different every time,
1159 * we don't know which one are valid.
1160 * so we check if all FDs are usable with a simple
1161 * ioctl call.
1162 */
1163 bt_list_for_each_entry(mmap_info, &mmap_list.head, list) {
1164 ret = helper_kernctl_get_mmap_len(mmap_info->fd, &mmap_len);
1165 if (ret != 0) {
1166 bt_list_del(&mmap_info->list);
1167 }
1168 }
1169 sem_post(&metadata_available);
1170 }
1171
1172 pthread_join(timer_thread, NULL);
1173 quit = 1;
1174 pthread_join(display_thread, NULL);
1175
1176 lttng_stop_tracing("test");
1177 lttng_destroy_session("test");
1178
1179 goto end;
1180 } else {
1181 init_lttngtop();
1182
1183 bt_ctx = bt_context_create();
1184 ret = bt_context_add_traces_recursive(bt_ctx, opt_input_path, "ctf", NULL);
1185 if (ret < 0) {
1186 fprintf(stderr, "[error] Opening the trace\n");
1187 goto end;
1188 }
1189
1190 ret = check_requirements(bt_ctx);
1191 if (ret < 0) {
1192 fprintf(stderr, "[error] some mandatory contexts were missing, exiting.\n");
1193 goto end;
1194 }
1195 pthread_create(&display_thread, NULL, ncurses_display, (void *) NULL);
1196 pthread_create(&timer_thread, NULL, refresh_thread, (void *) NULL);
1197
1198 iter_trace(bt_ctx);
1199
1200 pthread_join(display_thread, NULL);
1201 quit = 1;
1202 pthread_join(timer_thread, NULL);
1203 }
1204
1205 end:
1206 if (bt_ctx)
1207 bt_context_put(bt_ctx);
1208
1209 return 0;
1210 }
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