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7076f9c5edb723972f69ddeadfd66e2ecdabb1cb
[babeltrace.git] / formats / lttng-live / lttng-live-comm.c
1 /*
2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a copy
6 * of this software and associated documentation files (the "Software"), to deal
7 * in the Software without restriction, including without limitation the rights
8 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
9 * copies of the Software, and to permit persons to whom the Software is
10 * furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
18 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include <sys/socket.h>
25 #include <sys/types.h>
26 #include <netinet/in.h>
27 #include <netdb.h>
28 #include <stdio.h>
29 #include <string.h>
30 #include <stdlib.h>
31 #include <unistd.h>
32 #include <errno.h>
33 #include <inttypes.h>
34 #include <fcntl.h>
35 #include <sys/mman.h>
36
37 #include <babeltrace/ctf/ctf-index.h>
38
39 #include <babeltrace/babeltrace.h>
40 #include <babeltrace/ctf/events.h>
41 #include <babeltrace/ctf/callbacks.h>
42 #include <babeltrace/ctf/iterator.h>
43
44 /* for packet_index */
45 #include <babeltrace/ctf/types.h>
46
47 #include <babeltrace/ctf/metadata.h>
48 #include <babeltrace/ctf-text/types.h>
49 #include <babeltrace/ctf/events-internal.h>
50 #include <formats/ctf/events-private.h>
51
52 #include <babeltrace/compat/memstream.h>
53
54 #include "lttng-live.h"
55 #include "lttng-viewer-abi.h"
56
57 /*
58 * Memory allocation zeroed
59 */
60 #define zmalloc(x) calloc(1, x)
61
62 #ifndef max_t
63 #define max_t(type, a, b) \
64 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
65 #endif
66
67 static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
68 size_t index, int whence);
69 static void add_traces(gpointer key, gpointer value, gpointer user_data);
70 static int del_traces(gpointer key, gpointer value, gpointer user_data);
71 static int get_new_metadata(struct lttng_live_ctx *ctx,
72 struct lttng_live_viewer_stream *viewer_stream,
73 char **metadata_buf);
74
75 int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
76 {
77 struct hostent *host;
78 struct sockaddr_in server_addr;
79 int ret;
80
81 host = gethostbyname(ctx->relay_hostname);
82 if (!host) {
83 ret = -1;
84 goto end;
85 }
86
87 if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
88 perror("Socket");
89 ret = -1;
90 goto end;
91 }
92
93 server_addr.sin_family = AF_INET;
94 server_addr.sin_port = htons(ctx->port);
95 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
96 bzero(&(server_addr.sin_zero), 8);
97
98 if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
99 sizeof(struct sockaddr)) == -1) {
100 perror("Connect");
101 ret = -1;
102 goto end;
103 }
104
105 ret = 0;
106
107 end:
108 return ret;
109 }
110
111 int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
112 {
113 struct lttng_viewer_cmd cmd;
114 struct lttng_viewer_connect connect;
115 int ret;
116 ssize_t ret_len;
117
118 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
119 cmd.data_size = sizeof(connect);
120 cmd.cmd_version = 0;
121
122 connect.viewer_session_id = -1ULL; /* will be set on recv */
123 connect.major = htobe32(LTTNG_LIVE_MAJOR);
124 connect.minor = htobe32(LTTNG_LIVE_MINOR);
125 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
126
127 do {
128 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
129 } while (ret_len < 0 && errno == EINTR);
130 if (ret_len < 0) {
131 perror("[error] Error sending cmd");
132 ret = ret_len;
133 goto error;
134 }
135 assert(ret_len == sizeof(cmd));
136
137 do {
138 ret_len = send(ctx->control_sock, &connect, sizeof(connect), 0);
139 } while (ret_len < 0 && errno == EINTR);
140 if (ret_len < 0) {
141 perror("[error] Error sending version");
142 ret = ret_len;
143 goto error;
144 }
145 assert(ret_len == sizeof(connect));
146
147 do {
148 ret_len = recv(ctx->control_sock, &connect, sizeof(connect), 0);
149 } while (ret_len < 0 && errno == EINTR);
150 if (ret_len == 0) {
151 fprintf(stderr, "[error] Remote side has closed connection\n");
152 ret = -1;
153 goto error;
154 }
155 if (ret_len < 0) {
156 perror("[error] Error receiving version");
157 ret = ret_len;
158 goto error;
159 }
160 assert(ret_len == sizeof(connect));
161
162 printf_verbose("Received viewer session ID : %" PRIu64 "\n",
163 be64toh(connect.viewer_session_id));
164 printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
165 be32toh(connect.minor));
166
167 ret = 0;
168
169 error:
170 return ret;
171 }
172
173 static
174 void free_session_list(GPtrArray *session_list)
175 {
176 int i;
177 struct lttng_live_relay_session *relay_session;
178
179 for (i = 0; i < session_list->len; i++) {
180 relay_session = g_ptr_array_index(session_list, i);
181 free(relay_session->name);
182 free(relay_session->hostname);
183 }
184 g_ptr_array_free(session_list, TRUE);
185 }
186
187 static
188 void print_session_list(GPtrArray *session_list, const char *path)
189 {
190 int i;
191 struct lttng_live_relay_session *relay_session;
192
193 for (i = 0; i < session_list->len; i++) {
194 relay_session = g_ptr_array_index(session_list, i);
195 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
196 "%u stream(s), %u client(s) connected)\n",
197 path, relay_session->hostname,
198 relay_session->name, relay_session->timer,
199 relay_session->streams, relay_session->clients);
200 }
201 }
202
203 static
204 void update_session_list(GPtrArray *session_list, char *hostname,
205 char *session_name, uint32_t streams, uint32_t clients,
206 uint32_t timer)
207 {
208 int i, found = 0;
209 struct lttng_live_relay_session *relay_session;
210
211 for (i = 0; i < session_list->len; i++) {
212 relay_session = g_ptr_array_index(session_list, i);
213 if ((strncmp(relay_session->hostname, hostname, NAME_MAX) == 0) &&
214 strncmp(relay_session->name,
215 session_name, NAME_MAX) == 0) {
216 relay_session->streams += streams;
217 if (relay_session->clients < clients)
218 relay_session->clients = clients;
219 found = 1;
220 break;
221 }
222 }
223 if (found)
224 return;
225
226 relay_session = g_new0(struct lttng_live_relay_session, 1);
227 relay_session->hostname = strndup(hostname, NAME_MAX);
228 relay_session->name = strndup(session_name, NAME_MAX);
229 relay_session->clients = clients;
230 relay_session->streams = streams;
231 relay_session->timer = timer;
232 g_ptr_array_add(session_list, relay_session);
233 }
234
235 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
236 {
237 struct lttng_viewer_cmd cmd;
238 struct lttng_viewer_list_sessions list;
239 struct lttng_viewer_session lsession;
240 int i, ret, sessions_count, print_list = 0;
241 ssize_t ret_len;
242 uint64_t session_id;
243 GPtrArray *session_list = NULL;
244
245 if (strlen(ctx->session_name) == 0) {
246 print_list = 1;
247 session_list = g_ptr_array_new();
248 }
249
250 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
251 cmd.data_size = 0;
252 cmd.cmd_version = 0;
253
254 do {
255 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
256 } while (ret_len < 0 && errno == EINTR);
257 if (ret_len < 0) {
258 perror("[error] Error sending cmd");
259 ret = ret_len;
260 goto error;
261 }
262 assert(ret_len == sizeof(cmd));
263
264 do {
265 ret_len = recv(ctx->control_sock, &list, sizeof(list), 0);
266 } while (ret_len < 0 && errno == EINTR);
267 if (ret_len == 0) {
268 fprintf(stderr, "[error] Remote side has closed connection\n");
269 ret = -1;
270 goto error;
271 }
272 if (ret_len < 0) {
273 perror("[error] Error receiving session list");
274 ret = ret_len;
275 goto error;
276 }
277 assert(ret_len == sizeof(list));
278
279 sessions_count = be32toh(list.sessions_count);
280 for (i = 0; i < sessions_count; i++) {
281 do {
282 ret_len = recv(ctx->control_sock, &lsession, sizeof(lsession), 0);
283 } while (ret_len < 0 && errno == EINTR);
284 if (ret_len == 0) {
285 fprintf(stderr, "[error] Remote side has closed connection\n");
286 ret = -1;
287 goto error;
288 }
289 if (ret_len < 0) {
290 perror("[error] Error receiving session");
291 ret = ret_len;
292 goto error;
293 }
294 assert(ret_len == sizeof(lsession));
295 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
296 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
297 session_id = be64toh(lsession.id);
298
299 if (print_list) {
300 update_session_list(session_list,
301 lsession.hostname,
302 lsession.session_name,
303 be32toh(lsession.streams),
304 be32toh(lsession.clients),
305 be32toh(lsession.live_timer));
306 } else {
307 if ((strncmp(lsession.session_name, ctx->session_name,
308 NAME_MAX) == 0) && (strncmp(lsession.hostname,
309 ctx->traced_hostname, NAME_MAX) == 0)) {
310 printf_verbose("Reading from session %" PRIu64 "\n",
311 session_id);
312 g_array_append_val(ctx->session_ids,
313 session_id);
314 }
315 }
316 }
317
318 if (print_list) {
319 print_session_list(session_list, path);
320 free_session_list(session_list);
321 }
322
323 ret = 0;
324
325 error:
326 return ret;
327 }
328
329 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
330 uint64_t ctf_trace_id)
331 {
332 struct lttng_live_ctf_trace *trace;
333 int ret = 0;
334
335 trace = g_hash_table_lookup(stream->session->ctf_traces,
336 (gpointer) ctf_trace_id);
337 if (!trace) {
338 trace = g_new0(struct lttng_live_ctf_trace, 1);
339 trace->ctf_trace_id = ctf_trace_id;
340 trace->streams = g_ptr_array_new();
341 g_hash_table_insert(stream->session->ctf_traces,
342 (gpointer) ctf_trace_id,
343 trace);
344 }
345 if (stream->metadata_flag)
346 trace->metadata_stream = stream;
347
348 stream->ctf_trace = trace;
349 g_ptr_array_add(trace->streams, stream);
350
351 return ret;
352 }
353
354 static
355 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
356 char **metadata_buf, size_t *size)
357 {
358 int ret = 0;
359
360 stream->metadata_fp_write =
361 babeltrace_open_memstream(metadata_buf, size);
362 if (!stream->metadata_fp_write) {
363 perror("Metadata open_memstream");
364 ret = -1;
365 }
366
367 return ret;
368 }
369
370 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
371 {
372 struct lttng_viewer_cmd cmd;
373 struct lttng_viewer_attach_session_request rq;
374 struct lttng_viewer_attach_session_response rp;
375 struct lttng_viewer_stream stream;
376 int ret, i;
377 ssize_t ret_len;
378
379 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
380 cmd.data_size = sizeof(rq);
381 cmd.cmd_version = 0;
382
383 memset(&rq, 0, sizeof(rq));
384 rq.session_id = htobe64(id);
385 // TODO: add cmd line parameter to select seek beginning
386 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
387 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
388
389 do {
390 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
391 } while (ret_len < 0 && errno == EINTR);
392 if (ret_len < 0) {
393 perror("[error] Error sending cmd");
394 ret = ret_len;
395 goto error;
396 }
397 assert(ret_len == sizeof(cmd));
398
399 do {
400 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
401 } while (ret_len < 0 && errno == EINTR);
402 if (ret_len < 0) {
403 perror("[error] Error sending attach request");
404 ret = ret_len;
405 goto error;
406 }
407 assert(ret_len == sizeof(rq));
408
409 do {
410 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
411 } while (ret_len < 0 && errno == EINTR);
412 if (ret_len == 0) {
413 fprintf(stderr, "[error] Remote side has closed connection\n");
414 ret = -1;
415 goto error;
416 }
417 if (ret_len < 0) {
418 perror("[error] Error receiving attach response");
419 ret = ret_len;
420 goto error;
421 }
422 assert(ret_len == sizeof(rp));
423
424 switch(be32toh(rp.status)) {
425 case LTTNG_VIEWER_ATTACH_OK:
426 break;
427 case LTTNG_VIEWER_ATTACH_UNK:
428 ret = -LTTNG_VIEWER_ATTACH_UNK;
429 goto end;
430 case LTTNG_VIEWER_ATTACH_ALREADY:
431 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
432 ret = -1;
433 goto end;
434 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
435 fprintf(stderr, "[error] Not a live session\n");
436 ret = -1;
437 goto end;
438 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
439 fprintf(stderr, "[error] Wrong seek parameter\n");
440 ret = -1;
441 goto end;
442 default:
443 fprintf(stderr, "[error] Unknown attach return code %u\n",
444 be32toh(rp.status));
445 ret = -1;
446 goto end;
447 }
448 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
449 ret = -1;
450 goto end;
451 }
452
453 ctx->session->stream_count += be32toh(rp.streams_count);
454 /*
455 * When the session is created but not started, we do an active wait
456 * until it starts. It allows the viewer to start processing the trace
457 * as soon as the session starts.
458 */
459 if (ctx->session->stream_count == 0) {
460 ret = 0;
461 goto end;
462 }
463 printf_verbose("Waiting for %" PRIu64 " streams:\n",
464 ctx->session->stream_count);
465 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
466 ctx->session->stream_count);
467 for (i = 0; i < be32toh(rp.streams_count); i++) {
468 do {
469 ret_len = recv(ctx->control_sock, &stream, sizeof(stream), 0);
470 } while (ret_len < 0 && errno == EINTR);
471 if (ret_len == 0) {
472 fprintf(stderr, "[error] Remote side has closed connection\n");
473 ret = -1;
474 goto error;
475 }
476 if (ret_len < 0) {
477 perror("[error] Error receiving stream");
478 ret = ret_len;
479 goto error;
480 }
481 assert(ret_len == sizeof(stream));
482 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
483 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
484
485 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
486 be64toh(stream.id), stream.path_name,
487 stream.channel_name);
488 ctx->session->streams[i].id = be64toh(stream.id);
489 ctx->session->streams[i].session = ctx->session;
490
491 ctx->session->streams[i].first_read = 1;
492 ctx->session->streams[i].mmap_size = 0;
493
494 if (be32toh(stream.metadata_flag)) {
495 ctx->session->streams[i].metadata_flag = 1;
496 }
497 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
498 be64toh(stream.ctf_trace_id));
499 if (ret < 0) {
500 goto error;
501 }
502
503 }
504 ret = 0;
505
506 end:
507 error:
508 return ret;
509 }
510
511 static
512 int ask_new_streams(struct lttng_live_ctx *ctx)
513 {
514 int i, ret = 0;
515 uint64_t id;
516
517 restart:
518 for (i = 0; i < ctx->session_ids->len; i++) {
519 id = g_array_index(ctx->session_ids, uint64_t, i);
520 ret = lttng_live_get_new_streams(ctx, id);
521 printf_verbose("Asking for new streams returns %d\n",
522 ret);
523 if (ret < 0) {
524 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
525 printf_verbose("Session %" PRIu64 " closed\n",
526 id);
527 /*
528 * The streams have already been closed during
529 * the reading, so we only need to get rid of
530 * the trace in our internal table of sessions.
531 */
532 g_array_remove_index(ctx->session_ids, i);
533 /*
534 * We can't continue iterating on the g_array
535 * after a remove, we have to start again.
536 */
537 goto restart;
538 } else {
539 ret = -1;
540 goto end;
541 }
542 }
543 }
544
545 end:
546 return ret;
547 }
548
549 static
550 int get_data_packet(struct lttng_live_ctx *ctx,
551 struct ctf_stream_pos *pos,
552 struct lttng_live_viewer_stream *stream, uint64_t offset,
553 uint64_t len)
554 {
555 struct lttng_viewer_cmd cmd;
556 struct lttng_viewer_get_packet rq;
557 struct lttng_viewer_trace_packet rp;
558 ssize_t ret_len;
559 int ret;
560
561 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
562 cmd.data_size = sizeof(rq);
563 cmd.cmd_version = 0;
564
565 memset(&rq, 0, sizeof(rq));
566 rq.stream_id = htobe64(stream->id);
567 /* Already in big endian. */
568 rq.offset = offset;
569 rq.len = htobe32(len);
570
571 do {
572 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
573 } while (ret_len < 0 && errno == EINTR);
574 if (ret_len < 0) {
575 perror("[error] Error sending cmd");
576 ret = ret_len;
577 goto error;
578 }
579 assert(ret_len == sizeof(cmd));
580
581 do {
582 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
583 } while (ret_len < 0 && errno == EINTR);
584 if (ret_len < 0) {
585 perror("[error] Error sending get_data_packet request");
586 ret = ret_len;
587 goto error;
588 }
589 assert(ret_len == sizeof(rq));
590
591 do {
592 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
593 } while (ret_len < 0 && errno == EINTR);
594 if (ret_len == 0) {
595 fprintf(stderr, "[error] Remote side has closed connection\n");
596 ret = -1;
597 goto error;
598 }
599 if (ret_len < 0) {
600 perror("[error] Error receiving data response");
601 ret = ret_len;
602 goto error;
603 }
604 if (ret_len != sizeof(rp)) {
605 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
606 ", received %" PRId64 "\n", ret_len,
607 sizeof(rp));
608 ret = -1;
609 goto error;
610 }
611
612 rp.flags = be32toh(rp.flags);
613
614 switch (be32toh(rp.status)) {
615 case LTTNG_VIEWER_GET_PACKET_OK:
616 len = be32toh(rp.len);
617 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
618 "\n", len);
619 break;
620 case LTTNG_VIEWER_GET_PACKET_RETRY:
621 printf_verbose("get_data_packet: retry\n");
622 ret = -1;
623 goto end;
624 case LTTNG_VIEWER_GET_PACKET_ERR:
625 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
626 printf_verbose("get_data_packet: new metadata needed\n");
627 ret = 0;
628 goto end;
629 }
630 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
631 ret = ask_new_streams(ctx);
632 if (ret < 0)
633 goto error;
634 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
635 ctx->bt_ctx);
636 }
637 fprintf(stderr, "[error] get_data_packet: error\n");
638 ret = -1;
639 goto end;
640 case LTTNG_VIEWER_GET_PACKET_EOF:
641 ret = -2;
642 goto error;
643 default:
644 printf_verbose("get_data_packet: unknown\n");
645 assert(0);
646 ret = -1;
647 goto end;
648 }
649
650 if (len <= 0) {
651 ret = -1;
652 goto end;
653 }
654
655 if (len > stream->mmap_size) {
656 uint64_t new_size;
657
658 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
659 if (pos->base_mma) {
660 /* unmap old base */
661 ret = munmap_align(pos->base_mma);
662 if (ret) {
663 perror("[error] Unable to unmap old base");
664 ret = -1;
665 goto error;
666 }
667 pos->base_mma = NULL;
668 }
669 pos->base_mma = mmap_align(new_size,
670 PROT_READ | PROT_WRITE,
671 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
672 if (pos->base_mma == MAP_FAILED) {
673 perror("[error] mmap error");
674 pos->base_mma = NULL;
675 ret = -1;
676 goto error;
677 }
678
679 stream->mmap_size = new_size;
680 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
681 stream->mmap_size);
682 }
683
684 do {
685 ret_len = recv(ctx->control_sock,
686 mmap_align_addr(pos->base_mma), len,
687 MSG_WAITALL);
688 } while (ret_len < 0 && errno == EINTR);
689 if (ret_len == 0) {
690 fprintf(stderr, "[error] Remote side has closed connection\n");
691 ret = -1;
692 goto error;
693 }
694 if (ret_len < 0) {
695 perror("[error] Error receiving trace packet");
696 ret = ret_len;
697 goto error;
698 }
699 assert(ret_len == len);
700
701 end:
702 error:
703 return ret;
704 }
705
706 static
707 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
708 struct lttng_live_viewer_stream *metadata_stream)
709 {
710 uint64_t len = 0;
711 int ret;
712 struct lttng_viewer_cmd cmd;
713 struct lttng_viewer_get_metadata rq;
714 struct lttng_viewer_metadata_packet rp;
715 char *data = NULL;
716 ssize_t ret_len;
717
718 rq.stream_id = htobe64(metadata_stream->id);
719 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
720 cmd.data_size = sizeof(rq);
721 cmd.cmd_version = 0;
722
723 do {
724 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
725 } while (ret_len < 0 && errno == EINTR);
726 if (ret_len < 0) {
727 perror("[error] Error sending cmd");
728 ret = ret_len;
729 goto error;
730 }
731 assert(ret_len == sizeof(cmd));
732
733 do {
734 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
735 } while (ret_len < 0 && errno == EINTR);
736 if (ret_len < 0) {
737 perror("[error] Error sending get_metadata request");
738 ret = ret_len;
739 goto error;
740 }
741 assert(ret_len == sizeof(rq));
742
743 do {
744 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
745 } while (ret_len < 0 && errno == EINTR);
746 if (ret_len == 0) {
747 fprintf(stderr, "[error] Remote side has closed connection\n");
748 ret = -1;
749 goto error;
750 }
751 if (ret_len < 0) {
752 perror("[error] Error receiving metadata response");
753 ret = ret_len;
754 goto error;
755 }
756 assert(ret_len == sizeof(rp));
757
758 switch (be32toh(rp.status)) {
759 case LTTNG_VIEWER_METADATA_OK:
760 printf_verbose("get_metadata : OK\n");
761 break;
762 case LTTNG_VIEWER_NO_NEW_METADATA:
763 printf_verbose("get_metadata : NO NEW\n");
764 ret = 0;
765 goto end;
766 case LTTNG_VIEWER_METADATA_ERR:
767 printf_verbose("get_metadata : ERR\n");
768 ret = -1;
769 goto end;
770 default:
771 printf_verbose("get_metadata : UNKNOWN\n");
772 ret = -1;
773 goto end;
774 }
775
776 len = be64toh(rp.len);
777 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
778 if (len <= 0) {
779 ret = -1;
780 goto end;
781 }
782
783 data = zmalloc(len);
784 if (!data) {
785 perror("relay data zmalloc");
786 ret = -1;
787 goto error;
788 }
789 do {
790 ret_len = recv(ctx->control_sock, data, len, MSG_WAITALL);
791 } while (ret_len < 0 && errno == EINTR);
792 if (ret_len == 0) {
793 fprintf(stderr, "[error] Remote side has closed connection\n");
794 ret = -1;
795 free(data);
796 goto error;
797 }
798 if (ret_len < 0) {
799 perror("[error] Error receiving trace packet");
800 ret = ret_len;
801 free(data);
802 goto error;
803 }
804 assert(ret_len == len);
805
806 do {
807 ret_len = fwrite(data, 1, len,
808 metadata_stream->metadata_fp_write);
809 } while (ret_len < 0 && errno == EINTR);
810 if (ret_len < 0) {
811 fprintf(stderr, "[error] Writing in the metadata fp\n");
812 free(data);
813 ret = ret_len;
814 goto error;
815 }
816 assert(ret_len == len);
817 metadata_stream->metadata_len += len;
818 ret = len;
819
820 free(data);
821
822 end:
823 error:
824 return ret;
825 }
826
827 /*
828 * Return 0 on success, a negative value on error.
829 */
830 static
831 int get_new_metadata(struct lttng_live_ctx *ctx,
832 struct lttng_live_viewer_stream *viewer_stream,
833 char **metadata_buf)
834 {
835 int ret = 0;
836 struct lttng_live_viewer_stream *metadata_stream;
837 size_t size;
838
839 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
840 metadata_stream->metadata_len = 0;
841 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
842 if (ret < 0) {
843 goto error;
844 }
845
846 do {
847 /*
848 * get_one_metadata_packet returns the number of bytes
849 * received, 0 when we have received everything, a
850 * negative value on error.
851 */
852 ret = get_one_metadata_packet(ctx, metadata_stream);
853 } while (ret > 0);
854
855 fclose(metadata_stream->metadata_fp_write);
856 metadata_stream->metadata_fp_write = NULL;
857
858 error:
859 return ret;
860 }
861
862 /*
863 * Get one index for a stream.
864 *
865 * Returns 0 on success or a negative value on error.
866 */
867 static
868 int get_next_index(struct lttng_live_ctx *ctx,
869 struct lttng_live_viewer_stream *viewer_stream,
870 struct packet_index *index)
871 {
872 struct lttng_viewer_cmd cmd;
873 struct lttng_viewer_get_next_index rq;
874 struct lttng_viewer_index rp;
875 int ret;
876 ssize_t ret_len;
877
878 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
879 cmd.data_size = sizeof(rq);
880 cmd.cmd_version = 0;
881
882 memset(&rq, 0, sizeof(rq));
883 rq.stream_id = htobe64(viewer_stream->id);
884
885 retry:
886 do {
887 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
888 } while (ret_len < 0 && errno == EINTR);
889 if (ret_len < 0) {
890 perror("[error] Error sending cmd");
891 ret = ret_len;
892 goto error;
893 }
894 assert(ret_len == sizeof(cmd));
895
896 do {
897 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
898 } while (ret_len < 0 && errno == EINTR);
899 if (ret_len < 0) {
900 perror("[error] Error sending get_next_index request");
901 ret = ret_len;
902 goto error;
903 }
904 assert(ret_len == sizeof(rq));
905
906 do {
907 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
908 } while (ret_len < 0 && errno == EINTR);
909 if (ret_len == 0) {
910 fprintf(stderr, "[error] Remote side has closed connection\n");
911 ret = -1;
912 goto error;
913 }
914 if (ret_len < 0) {
915 perror("[error] Error receiving index response");
916 ret = ret_len;
917 goto error;
918 }
919 assert(ret_len == sizeof(rp));
920
921 rp.flags = be32toh(rp.flags);
922
923 switch (be32toh(rp.status)) {
924 case LTTNG_VIEWER_INDEX_INACTIVE:
925 printf_verbose("get_next_index: inactive\n");
926 memset(index, 0, sizeof(struct packet_index));
927 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
928 break;
929 case LTTNG_VIEWER_INDEX_OK:
930 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
931 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
932 index->offset = be64toh(rp.offset);
933 index->packet_size = be64toh(rp.packet_size);
934 index->content_size = be64toh(rp.content_size);
935 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
936 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
937 index->events_discarded = be64toh(rp.events_discarded);
938
939 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
940 struct lttng_live_viewer_stream *metadata;
941 char *metadata_buf = NULL;
942
943 printf_verbose("get_next_index: new metadata needed\n");
944 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
945 if (ret < 0) {
946 goto error;
947 }
948 metadata = viewer_stream->ctf_trace->metadata_stream;
949 metadata->ctf_trace->metadata_fp =
950 babeltrace_fmemopen(metadata_buf,
951 metadata->metadata_len, "rb");
952 if (!metadata->ctf_trace->metadata_fp) {
953 perror("Metadata fmemopen");
954 ret = -1;
955 goto error;
956 }
957 }
958 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
959 ret = ask_new_streams(ctx);
960 if (ret < 0)
961 goto error;
962 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
963 ctx->bt_ctx);
964 }
965 break;
966 case LTTNG_VIEWER_INDEX_RETRY:
967 printf_verbose("get_next_index: retry\n");
968 sleep(1);
969 goto retry;
970 case LTTNG_VIEWER_INDEX_HUP:
971 printf_verbose("get_next_index: stream hung up\n");
972 viewer_stream->id = -1ULL;
973 index->offset = EOF;
974 ctx->session->stream_count--;
975 break;
976 case LTTNG_VIEWER_INDEX_ERR:
977 fprintf(stderr, "[error] get_next_index: error\n");
978 ret = -1;
979 goto error;
980 default:
981 fprintf(stderr, "[error] get_next_index: unkwown value\n");
982 ret = -1;
983 goto error;
984 }
985
986 ret = 0;
987
988 error:
989 return ret;
990 }
991
992 static
993 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
994 int whence)
995 {
996 struct ctf_stream_pos *pos;
997 struct ctf_file_stream *file_stream;
998 struct packet_index *prev_index = NULL, *cur_index;
999 struct lttng_live_viewer_stream *viewer_stream;
1000 struct lttng_live_session *session;
1001 int ret;
1002
1003 retry:
1004 pos = ctf_pos(stream_pos);
1005 file_stream = container_of(pos, struct ctf_file_stream, pos);
1006 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1007 session = viewer_stream->session;
1008
1009 switch (pos->packet_index->len) {
1010 case 0:
1011 g_array_set_size(pos->packet_index, 1);
1012 cur_index = &g_array_index(pos->packet_index,
1013 struct packet_index, 0);
1014 break;
1015 case 1:
1016 g_array_set_size(pos->packet_index, 2);
1017 prev_index = &g_array_index(pos->packet_index,
1018 struct packet_index, 0);
1019 cur_index = &g_array_index(pos->packet_index,
1020 struct packet_index, 1);
1021 break;
1022 case 2:
1023 g_array_index(pos->packet_index,
1024 struct packet_index, 0) =
1025 g_array_index(pos->packet_index,
1026 struct packet_index, 1);
1027 prev_index = &g_array_index(pos->packet_index,
1028 struct packet_index, 0);
1029 cur_index = &g_array_index(pos->packet_index,
1030 struct packet_index, 1);
1031 break;
1032 default:
1033 abort();
1034 break;
1035 }
1036 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1037 ret = get_next_index(session->ctx, viewer_stream, cur_index);
1038 if (ret < 0) {
1039 pos->offset = EOF;
1040 fprintf(stderr, "[error] get_next_index failed\n");
1041 return;
1042 }
1043
1044 pos->packet_size = cur_index->packet_size;
1045 pos->content_size = cur_index->content_size;
1046 pos->mmap_base_offset = 0;
1047 if (cur_index->offset == EOF) {
1048 pos->offset = EOF;
1049 } else {
1050 pos->offset = 0;
1051 }
1052
1053 if (cur_index->content_size == 0) {
1054 file_stream->parent.cycles_timestamp =
1055 cur_index->ts_cycles.timestamp_end;
1056 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1057 &file_stream->parent,
1058 cur_index->ts_cycles.timestamp_end);
1059 } else {
1060 /* Convert the timestamps and append to the real_index. */
1061 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1062 &file_stream->parent,
1063 cur_index->ts_cycles.timestamp_begin);
1064 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1065 &file_stream->parent,
1066 cur_index->ts_cycles.timestamp_end);
1067
1068 ctf_update_current_packet_index(&file_stream->parent,
1069 prev_index, cur_index);
1070
1071 file_stream->parent.cycles_timestamp =
1072 cur_index->ts_cycles.timestamp_begin;
1073 file_stream->parent.real_timestamp =
1074 cur_index->ts_real.timestamp_begin;
1075 }
1076
1077 if (pos->packet_size == 0 || pos->offset == EOF) {
1078 goto end;
1079 }
1080
1081 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1082 viewer_stream->id);
1083 ret = get_data_packet(session->ctx, pos, viewer_stream,
1084 be64toh(cur_index->offset),
1085 cur_index->packet_size / CHAR_BIT);
1086 if (ret == -2) {
1087 goto retry;
1088 } else if (ret < 0) {
1089 pos->offset = EOF;
1090 fprintf(stderr, "[error] get_data_packet failed\n");
1091 return;
1092 }
1093
1094 printf_verbose("Index received : packet_size : %" PRIu64
1095 ", offset %" PRIu64 ", content_size %" PRIu64
1096 ", timestamp_end : %" PRIu64 "\n",
1097 cur_index->packet_size, cur_index->offset,
1098 cur_index->content_size,
1099 cur_index->ts_cycles.timestamp_end);
1100
1101 /* update trace_packet_header and stream_packet_context */
1102 if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1103 /* Read packet header */
1104 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1105 if (ret) {
1106 pos->offset = EOF;
1107 fprintf(stderr, "[error] trace packet header read failed\n");
1108 goto end;
1109 }
1110 }
1111 if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1112 /* Read packet context */
1113 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1114 if (ret) {
1115 pos->offset = EOF;
1116 fprintf(stderr, "[error] stream packet context read failed\n");
1117 goto end;
1118 }
1119 }
1120 pos->data_offset = pos->offset;
1121
1122 end:
1123 return;
1124 }
1125
1126 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1127 {
1128 struct lttng_viewer_cmd cmd;
1129 struct lttng_viewer_create_session_response resp;
1130 int ret;
1131 ssize_t ret_len;
1132
1133 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1134 cmd.data_size = 0;
1135 cmd.cmd_version = 0;
1136
1137 do {
1138 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
1139 } while (ret_len < 0 && errno == EINTR);
1140 if (ret_len < 0) {
1141 perror("[error] Error sending cmd");
1142 ret = ret_len;
1143 goto error;
1144 }
1145 assert(ret_len == sizeof(cmd));
1146
1147 do {
1148 ret_len = recv(ctx->control_sock, &resp, sizeof(resp), 0);
1149 } while (ret_len < 0 && errno == EINTR);
1150 if (ret_len == 0) {
1151 fprintf(stderr, "[error] Remote side has closed connection\n");
1152 ret = -1;
1153 goto error;
1154 }
1155 if (ret_len < 0) {
1156 perror("[error] Error receiving create session reply");
1157 ret = ret_len;
1158 goto error;
1159 }
1160 assert(ret_len == sizeof(resp));
1161
1162 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1163 fprintf(stderr, "[error] Error creating viewer session\n");
1164 ret = -1;
1165 goto error;
1166 }
1167 ret = 0;
1168
1169 error:
1170 return ret;
1171 }
1172
1173 static
1174 int del_traces(gpointer key, gpointer value, gpointer user_data)
1175 {
1176 struct bt_context *bt_ctx = user_data;
1177 struct lttng_live_ctf_trace *trace = value;
1178 int ret;
1179
1180 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1181 if (ret < 0)
1182 fprintf(stderr, "[error] removing trace from context\n");
1183
1184 /* remove the key/value pair from the HT. */
1185 return 1;
1186 }
1187
1188 static
1189 void add_traces(gpointer key, gpointer value, gpointer user_data)
1190 {
1191 int i, ret;
1192 struct bt_context *bt_ctx = user_data;
1193 struct lttng_live_ctf_trace *trace = value;
1194 struct lttng_live_viewer_stream *stream;
1195 struct bt_mmap_stream *new_mmap_stream;
1196 struct bt_mmap_stream_list mmap_list;
1197 struct lttng_live_ctx *ctx = NULL;
1198 struct bt_trace_descriptor *td;
1199 struct bt_trace_handle *handle;
1200
1201 /*
1202 * We don't know how many streams we will receive for a trace, so
1203 * once we are done receiving the traces, we add all the traces
1204 * received to the bt_context.
1205 * We can receive streams during the attach command or the
1206 * get_new_streams, so we have to make sure not to add multiple
1207 * times the same traces.
1208 * If a trace is already in the context, we just skip this function.
1209 */
1210 if (trace->in_use)
1211 return;
1212
1213 BT_INIT_LIST_HEAD(&mmap_list.head);
1214
1215 for (i = 0; i < trace->streams->len; i++) {
1216 stream = g_ptr_array_index(trace->streams, i);
1217 ctx = stream->session->ctx;
1218
1219 if (!stream->metadata_flag) {
1220 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1221 new_mmap_stream->priv = (void *) stream;
1222 new_mmap_stream->fd = -1;
1223 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1224 } else {
1225 char *metadata_buf = NULL;
1226
1227 /* Get all possible metadata before starting */
1228 ret = get_new_metadata(ctx, stream, &metadata_buf);
1229 if (ret) {
1230 free(metadata_buf);
1231 goto end_free;
1232 }
1233 if (!stream->metadata_len) {
1234 fprintf(stderr, "[error] empty metadata\n");
1235 ret = -1;
1236 free(metadata_buf);
1237 goto end_free;
1238 }
1239
1240 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1241 stream->metadata_len, "rb");
1242 if (!trace->metadata_fp) {
1243 perror("Metadata fmemopen");
1244 ret = -1;
1245 free(metadata_buf);
1246 goto end_free;
1247 }
1248 }
1249 }
1250
1251 if (!trace->metadata_fp) {
1252 fprintf(stderr, "[error] No metadata stream opened\n");
1253 goto end_free;
1254 }
1255
1256 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1257 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1258 if (ret < 0) {
1259 fprintf(stderr, "[error] Error adding trace\n");
1260 goto end_free;
1261 }
1262 trace->metadata_stream->metadata_len = 0;
1263
1264 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1265 bt_ctx->trace_handles,
1266 (gpointer) (unsigned long) ret);
1267 td = handle->td;
1268 trace->handle = handle;
1269 if (bt_ctx->current_iterator) {
1270 bt_iter_add_trace(bt_ctx->current_iterator, td);
1271 }
1272
1273 trace->trace_id = ret;
1274 trace->in_use = 1;
1275
1276 goto end;
1277
1278 end_free:
1279 bt_context_put(bt_ctx);
1280 end:
1281 return;
1282 }
1283
1284 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1285 {
1286 struct lttng_viewer_cmd cmd;
1287 struct lttng_viewer_new_streams_request rq;
1288 struct lttng_viewer_new_streams_response rp;
1289 struct lttng_viewer_stream stream;
1290 int ret, i;
1291 ssize_t ret_len;
1292 uint32_t stream_count;
1293
1294 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1295 cmd.data_size = sizeof(rq);
1296 cmd.cmd_version = 0;
1297
1298 memset(&rq, 0, sizeof(rq));
1299 rq.session_id = htobe64(id);
1300
1301 do {
1302 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
1303 } while (ret_len < 0 && errno == EINTR);
1304 if (ret_len < 0) {
1305 perror("[error] Error sending cmd");
1306 ret = ret_len;
1307 goto error;
1308 }
1309 assert(ret_len == sizeof(cmd));
1310
1311 do {
1312 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
1313 } while (ret_len < 0 && errno == EINTR);
1314 if (ret_len < 0) {
1315 perror("[error] Error sending get_new_streams request");
1316 ret = ret_len;
1317 goto error;
1318 }
1319 assert(ret_len == sizeof(rq));
1320
1321 do {
1322 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
1323 } while (ret_len < 0 && errno == EINTR);
1324 if (ret_len == 0) {
1325 fprintf(stderr, "[error] Remote side has closed connection\n");
1326 ret = -1;
1327 goto error;
1328 }
1329 if (ret_len < 0) {
1330 perror("[error] Error receiving get_new_streams response");
1331 ret = ret_len;
1332 goto error;
1333 }
1334 assert(ret_len == sizeof(rp));
1335
1336 switch(be32toh(rp.status)) {
1337 case LTTNG_VIEWER_NEW_STREAMS_OK:
1338 break;
1339 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1340 ret = 0;
1341 goto end;
1342 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1343 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1344 goto end;
1345 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1346 fprintf(stderr, "[error] get_new_streams error\n");
1347 ret = -1;
1348 goto end;
1349 default:
1350 fprintf(stderr, "[error] Unknown return code %u\n",
1351 be32toh(rp.status));
1352 ret = -1;
1353 goto end;
1354 }
1355
1356 stream_count = be32toh(rp.streams_count);
1357 ctx->session->stream_count += stream_count;
1358 /*
1359 * When the session is created but not started, we do an active wait
1360 * until it starts. It allows the viewer to start processing the trace
1361 * as soon as the session starts.
1362 */
1363 if (ctx->session->stream_count == 0) {
1364 ret = 0;
1365 goto end;
1366 }
1367 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1368 ctx->session->stream_count);
1369 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1370 ctx->session->stream_count);
1371 for (i = 0; i < stream_count; i++) {
1372 do {
1373 ret_len = recv(ctx->control_sock, &stream, sizeof(stream), 0);
1374 } while (ret_len < 0 && errno == EINTR);
1375 if (ret_len == 0) {
1376 fprintf(stderr, "[error] Remote side has closed connection\n");
1377 ret = -1;
1378 goto error;
1379 }
1380 if (ret_len < 0) {
1381 perror("[error] Error receiving stream");
1382 ret = ret_len;
1383 goto error;
1384 }
1385 assert(ret_len == sizeof(stream));
1386 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1387 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1388
1389 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1390 be64toh(stream.id), stream.path_name,
1391 stream.channel_name);
1392 ctx->session->streams[i].id = be64toh(stream.id);
1393 ctx->session->streams[i].session = ctx->session;
1394
1395 ctx->session->streams[i].first_read = 1;
1396 ctx->session->streams[i].mmap_size = 0;
1397
1398 if (be32toh(stream.metadata_flag)) {
1399 ctx->session->streams[i].metadata_flag = 1;
1400 }
1401 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1402 be64toh(stream.ctf_trace_id));
1403 if (ret < 0) {
1404 goto error;
1405 }
1406
1407 }
1408 ret = 0;
1409
1410 end:
1411 error:
1412 return ret;
1413 }
1414
1415 void lttng_live_read(struct lttng_live_ctx *ctx)
1416 {
1417 int ret, i;
1418 struct bt_ctf_iter *iter;
1419 const struct bt_ctf_event *event;
1420 struct bt_iter_pos begin_pos;
1421 struct bt_trace_descriptor *td_write;
1422 struct bt_format *fmt_write;
1423 struct ctf_text_stream_pos *sout;
1424 uint64_t id;
1425
1426 ctx->bt_ctx = bt_context_create();
1427 if (!ctx->bt_ctx) {
1428 fprintf(stderr, "[error] bt_context_create allocation\n");
1429 goto end;
1430 }
1431
1432 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1433 if (!fmt_write) {
1434 fprintf(stderr, "[error] ctf-text error\n");
1435 goto end;
1436 }
1437
1438 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1439 if (!td_write) {
1440 fprintf(stderr, "[error] Error opening output trace\n");
1441 goto end_free;
1442 }
1443
1444 sout = container_of(td_write, struct ctf_text_stream_pos,
1445 trace_descriptor);
1446 if (!sout->parent.event_cb)
1447 goto end_free;
1448
1449 ret = lttng_live_create_viewer_session(ctx);
1450 if (ret < 0) {
1451 goto end_free;
1452 }
1453
1454 for (i = 0; i < ctx->session_ids->len; i++) {
1455 id = g_array_index(ctx->session_ids, uint64_t, i);
1456 printf_verbose("Attaching to session %lu\n", id);
1457 ret = lttng_live_attach_session(ctx, id);
1458 printf_verbose("Attaching session returns %d\n", ret);
1459 if (ret < 0) {
1460 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1461 fprintf(stderr, "[error] Unknown session ID\n");
1462 }
1463 goto end_free;
1464 }
1465 }
1466
1467 /*
1468 * As long as the session is active, we try to get new streams.
1469 */
1470 for (;;) {
1471 int flags;
1472
1473 while (!ctx->session->stream_count) {
1474 if (ctx->session_ids->len == 0)
1475 goto end_free;
1476 ret = ask_new_streams(ctx);
1477 if (ret < 0)
1478 goto end_free;
1479 }
1480
1481 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1482 ctx->bt_ctx);
1483
1484 begin_pos.type = BT_SEEK_BEGIN;
1485 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1486 if (!iter) {
1487 fprintf(stderr, "[error] Iterator creation error\n");
1488 goto end;
1489 }
1490 for (;;) {
1491 event = bt_ctf_iter_read_event_flags(iter, &flags);
1492 if (!(flags & BT_ITER_FLAG_RETRY)) {
1493 if (!event) {
1494 /* End of trace */
1495 break;
1496 }
1497 ret = sout->parent.event_cb(&sout->parent,
1498 event->parent->stream);
1499 if (ret) {
1500 fprintf(stderr, "[error] Writing "
1501 "event failed.\n");
1502 goto end_free;
1503 }
1504 }
1505 ret = bt_iter_next(bt_ctf_get_iter(iter));
1506 if (ret < 0) {
1507 goto end_free;
1508 }
1509 }
1510 bt_ctf_iter_destroy(iter);
1511 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1512 del_traces, ctx->bt_ctx);
1513 ctx->session->stream_count = 0;
1514 }
1515
1516 end_free:
1517 bt_context_put(ctx->bt_ctx);
1518 end:
1519 return;
1520 }
BabelTrace - Trace Format Babel Tower
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