projects / babeltrace.git / blob
? search:


a53f6c3a65c7f6d6603d9ed799ffa52c2caf3d23
[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 append_metadata(struct lttng_live_ctx *ctx,
551 struct lttng_live_viewer_stream *viewer_stream)
552 {
553 int ret;
554 struct lttng_live_viewer_stream *metadata;
555 char *metadata_buf = NULL;
556
557 printf_verbose("get_next_index: new metadata needed\n");
558 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
559 if (ret < 0) {
560 free(metadata_buf);
561 goto error;
562 }
563
564 metadata = viewer_stream->ctf_trace->metadata_stream;
565 metadata->ctf_trace->metadata_fp =
566 babeltrace_fmemopen(metadata_buf,
567 metadata->metadata_len, "rb");
568 if (!metadata->ctf_trace->metadata_fp) {
569 perror("Metadata fmemopen");
570 free(metadata_buf);
571 ret = -1;
572 goto error;
573 }
574 ret = ctf_append_trace_metadata(
575 viewer_stream->ctf_trace->handle->td,
576 metadata->ctf_trace->metadata_fp);
577 if (ret != 0) {
578 fprintf(stderr, "[error] Appending metadata\n");
579 goto error;
580 }
581
582 error:
583 return ret;
584 }
585
586 static
587 int get_data_packet(struct lttng_live_ctx *ctx,
588 struct ctf_stream_pos *pos,
589 struct lttng_live_viewer_stream *stream, uint64_t offset,
590 uint64_t len)
591 {
592 struct lttng_viewer_cmd cmd;
593 struct lttng_viewer_get_packet rq;
594 struct lttng_viewer_trace_packet rp;
595 ssize_t ret_len;
596 int ret;
597
598 retry:
599 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
600 cmd.data_size = sizeof(rq);
601 cmd.cmd_version = 0;
602
603 memset(&rq, 0, sizeof(rq));
604 rq.stream_id = htobe64(stream->id);
605 /* Already in big endian. */
606 rq.offset = offset;
607 rq.len = htobe32(len);
608
609 do {
610 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
611 } while (ret_len < 0 && errno == EINTR);
612 if (ret_len < 0) {
613 perror("[error] Error sending cmd");
614 ret = ret_len;
615 goto error;
616 }
617 assert(ret_len == sizeof(cmd));
618
619 do {
620 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
621 } while (ret_len < 0 && errno == EINTR);
622 if (ret_len < 0) {
623 perror("[error] Error sending get_data_packet request");
624 ret = ret_len;
625 goto error;
626 }
627 assert(ret_len == sizeof(rq));
628
629 do {
630 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
631 } while (ret_len < 0 && errno == EINTR);
632 if (ret_len == 0) {
633 fprintf(stderr, "[error] Remote side has closed connection\n");
634 ret = -1;
635 goto error;
636 }
637 if (ret_len < 0) {
638 perror("[error] Error receiving data response");
639 ret = ret_len;
640 goto error;
641 }
642 if (ret_len != sizeof(rp)) {
643 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
644 ", received %" PRId64 "\n", ret_len,
645 sizeof(rp));
646 ret = -1;
647 goto error;
648 }
649
650 rp.flags = be32toh(rp.flags);
651
652 switch (be32toh(rp.status)) {
653 case LTTNG_VIEWER_GET_PACKET_OK:
654 len = be32toh(rp.len);
655 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
656 "\n", len);
657 break;
658 case LTTNG_VIEWER_GET_PACKET_RETRY:
659 printf_verbose("get_data_packet: retry\n");
660 ret = -1;
661 goto end;
662 case LTTNG_VIEWER_GET_PACKET_ERR:
663 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
664 printf_verbose("get_data_packet: new metadata needed\n");
665 ret = append_metadata(ctx, stream);
666 if (ret)
667 goto error;
668 goto retry;
669 }
670 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
671 ret = ask_new_streams(ctx);
672 if (ret < 0)
673 goto error;
674 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
675 ctx->bt_ctx);
676 }
677 fprintf(stderr, "[error] get_data_packet: error\n");
678 ret = -1;
679 goto end;
680 case LTTNG_VIEWER_GET_PACKET_EOF:
681 ret = -2;
682 goto error;
683 default:
684 printf_verbose("get_data_packet: unknown\n");
685 assert(0);
686 ret = -1;
687 goto end;
688 }
689
690 if (len <= 0) {
691 ret = -1;
692 goto end;
693 }
694
695 if (len > stream->mmap_size) {
696 uint64_t new_size;
697
698 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
699 if (pos->base_mma) {
700 /* unmap old base */
701 ret = munmap_align(pos->base_mma);
702 if (ret) {
703 perror("[error] Unable to unmap old base");
704 ret = -1;
705 goto error;
706 }
707 pos->base_mma = NULL;
708 }
709 pos->base_mma = mmap_align(new_size,
710 PROT_READ | PROT_WRITE,
711 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
712 if (pos->base_mma == MAP_FAILED) {
713 perror("[error] mmap error");
714 pos->base_mma = NULL;
715 ret = -1;
716 goto error;
717 }
718
719 stream->mmap_size = new_size;
720 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
721 stream->mmap_size);
722 }
723
724 do {
725 ret_len = recv(ctx->control_sock,
726 mmap_align_addr(pos->base_mma), len,
727 MSG_WAITALL);
728 } while (ret_len < 0 && errno == EINTR);
729 if (ret_len == 0) {
730 fprintf(stderr, "[error] Remote side has closed connection\n");
731 ret = -1;
732 goto error;
733 }
734 if (ret_len < 0) {
735 perror("[error] Error receiving trace packet");
736 ret = ret_len;
737 goto error;
738 }
739 assert(ret_len == len);
740
741 end:
742 error:
743 return ret;
744 }
745
746 static
747 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
748 struct lttng_live_viewer_stream *metadata_stream)
749 {
750 uint64_t len = 0;
751 int ret;
752 struct lttng_viewer_cmd cmd;
753 struct lttng_viewer_get_metadata rq;
754 struct lttng_viewer_metadata_packet rp;
755 char *data = NULL;
756 ssize_t ret_len;
757
758 rq.stream_id = htobe64(metadata_stream->id);
759 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
760 cmd.data_size = sizeof(rq);
761 cmd.cmd_version = 0;
762
763 do {
764 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
765 } while (ret_len < 0 && errno == EINTR);
766 if (ret_len < 0) {
767 perror("[error] Error sending cmd");
768 ret = ret_len;
769 goto error;
770 }
771 assert(ret_len == sizeof(cmd));
772
773 do {
774 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
775 } while (ret_len < 0 && errno == EINTR);
776 if (ret_len < 0) {
777 perror("[error] Error sending get_metadata request");
778 ret = ret_len;
779 goto error;
780 }
781 assert(ret_len == sizeof(rq));
782
783 do {
784 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
785 } while (ret_len < 0 && errno == EINTR);
786 if (ret_len == 0) {
787 fprintf(stderr, "[error] Remote side has closed connection\n");
788 ret = -1;
789 goto error;
790 }
791 if (ret_len < 0) {
792 perror("[error] Error receiving metadata response");
793 ret = ret_len;
794 goto error;
795 }
796 assert(ret_len == sizeof(rp));
797
798 switch (be32toh(rp.status)) {
799 case LTTNG_VIEWER_METADATA_OK:
800 printf_verbose("get_metadata : OK\n");
801 break;
802 case LTTNG_VIEWER_NO_NEW_METADATA:
803 printf_verbose("get_metadata : NO NEW\n");
804 ret = 0;
805 goto end;
806 case LTTNG_VIEWER_METADATA_ERR:
807 printf_verbose("get_metadata : ERR\n");
808 ret = -1;
809 goto end;
810 default:
811 printf_verbose("get_metadata : UNKNOWN\n");
812 ret = -1;
813 goto end;
814 }
815
816 len = be64toh(rp.len);
817 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
818 if (len <= 0) {
819 ret = -1;
820 goto end;
821 }
822
823 data = zmalloc(len);
824 if (!data) {
825 perror("relay data zmalloc");
826 ret = -1;
827 goto error;
828 }
829 do {
830 ret_len = recv(ctx->control_sock, data, len, MSG_WAITALL);
831 } while (ret_len < 0 && errno == EINTR);
832 if (ret_len == 0) {
833 fprintf(stderr, "[error] Remote side has closed connection\n");
834 ret = -1;
835 free(data);
836 goto error;
837 }
838 if (ret_len < 0) {
839 perror("[error] Error receiving trace packet");
840 ret = ret_len;
841 free(data);
842 goto error;
843 }
844 assert(ret_len == len);
845
846 do {
847 ret_len = fwrite(data, 1, len,
848 metadata_stream->metadata_fp_write);
849 } while (ret_len < 0 && errno == EINTR);
850 if (ret_len < 0) {
851 fprintf(stderr, "[error] Writing in the metadata fp\n");
852 free(data);
853 ret = ret_len;
854 goto error;
855 }
856 assert(ret_len == len);
857 metadata_stream->metadata_len += len;
858 ret = len;
859
860 free(data);
861
862 end:
863 error:
864 return ret;
865 }
866
867 /*
868 * Return 0 on success, a negative value on error.
869 */
870 static
871 int get_new_metadata(struct lttng_live_ctx *ctx,
872 struct lttng_live_viewer_stream *viewer_stream,
873 char **metadata_buf)
874 {
875 int ret = 0;
876 struct lttng_live_viewer_stream *metadata_stream;
877 size_t size;
878
879 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
880 if (!metadata_stream) {
881 fprintf(stderr, "[error] No metadata stream\n");
882 ret = -1;
883 goto error;
884 }
885 metadata_stream->metadata_len = 0;
886 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
887 if (ret < 0) {
888 goto error;
889 }
890
891 do {
892 /*
893 * get_one_metadata_packet returns the number of bytes
894 * received, 0 when we have received everything, a
895 * negative value on error.
896 */
897 ret = get_one_metadata_packet(ctx, metadata_stream);
898 } while (ret > 0);
899
900 fclose(metadata_stream->metadata_fp_write);
901 metadata_stream->metadata_fp_write = NULL;
902
903 error:
904 return ret;
905 }
906
907 /*
908 * Get one index for a stream.
909 *
910 * Returns 0 on success or a negative value on error.
911 */
912 static
913 int get_next_index(struct lttng_live_ctx *ctx,
914 struct lttng_live_viewer_stream *viewer_stream,
915 struct packet_index *index)
916 {
917 struct lttng_viewer_cmd cmd;
918 struct lttng_viewer_get_next_index rq;
919 struct lttng_viewer_index rp;
920 int ret;
921 ssize_t ret_len;
922
923 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
924 cmd.data_size = sizeof(rq);
925 cmd.cmd_version = 0;
926
927 memset(&rq, 0, sizeof(rq));
928 rq.stream_id = htobe64(viewer_stream->id);
929
930 retry:
931 do {
932 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
933 } while (ret_len < 0 && errno == EINTR);
934 if (ret_len < 0) {
935 perror("[error] Error sending cmd");
936 ret = ret_len;
937 goto error;
938 }
939 assert(ret_len == sizeof(cmd));
940
941 do {
942 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
943 } while (ret_len < 0 && errno == EINTR);
944 if (ret_len < 0) {
945 perror("[error] Error sending get_next_index request");
946 ret = ret_len;
947 goto error;
948 }
949 assert(ret_len == sizeof(rq));
950
951 do {
952 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
953 } while (ret_len < 0 && errno == EINTR);
954 if (ret_len == 0) {
955 fprintf(stderr, "[error] Remote side has closed connection\n");
956 ret = -1;
957 goto error;
958 }
959 if (ret_len < 0) {
960 perror("[error] Error receiving index response");
961 ret = ret_len;
962 goto error;
963 }
964 assert(ret_len == sizeof(rp));
965
966 rp.flags = be32toh(rp.flags);
967
968 switch (be32toh(rp.status)) {
969 case LTTNG_VIEWER_INDEX_INACTIVE:
970 printf_verbose("get_next_index: inactive\n");
971 memset(index, 0, sizeof(struct packet_index));
972 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
973 break;
974 case LTTNG_VIEWER_INDEX_OK:
975 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
976 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
977 index->offset = be64toh(rp.offset);
978 index->packet_size = be64toh(rp.packet_size);
979 index->content_size = be64toh(rp.content_size);
980 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
981 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
982 index->events_discarded = be64toh(rp.events_discarded);
983
984 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
985 ret = append_metadata(ctx, viewer_stream);
986 if (ret)
987 goto error;
988 }
989 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
990 ret = ask_new_streams(ctx);
991 if (ret < 0)
992 goto error;
993 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
994 ctx->bt_ctx);
995 }
996 break;
997 case LTTNG_VIEWER_INDEX_RETRY:
998 printf_verbose("get_next_index: retry\n");
999 sleep(1);
1000 goto retry;
1001 case LTTNG_VIEWER_INDEX_HUP:
1002 printf_verbose("get_next_index: stream hung up\n");
1003 viewer_stream->id = -1ULL;
1004 index->offset = EOF;
1005 ctx->session->stream_count--;
1006 break;
1007 case LTTNG_VIEWER_INDEX_ERR:
1008 fprintf(stderr, "[error] get_next_index: error\n");
1009 ret = -1;
1010 goto error;
1011 default:
1012 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1013 ret = -1;
1014 goto error;
1015 }
1016
1017 ret = 0;
1018
1019 error:
1020 return ret;
1021 }
1022
1023 static
1024 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1025 int whence)
1026 {
1027 struct ctf_stream_pos *pos;
1028 struct ctf_file_stream *file_stream;
1029 struct packet_index *prev_index = NULL, *cur_index;
1030 struct lttng_live_viewer_stream *viewer_stream;
1031 struct lttng_live_session *session;
1032 int ret;
1033
1034 retry:
1035 pos = ctf_pos(stream_pos);
1036 file_stream = container_of(pos, struct ctf_file_stream, pos);
1037 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1038 session = viewer_stream->session;
1039
1040 switch (pos->packet_index->len) {
1041 case 0:
1042 g_array_set_size(pos->packet_index, 1);
1043 cur_index = &g_array_index(pos->packet_index,
1044 struct packet_index, 0);
1045 break;
1046 case 1:
1047 g_array_set_size(pos->packet_index, 2);
1048 prev_index = &g_array_index(pos->packet_index,
1049 struct packet_index, 0);
1050 cur_index = &g_array_index(pos->packet_index,
1051 struct packet_index, 1);
1052 break;
1053 case 2:
1054 g_array_index(pos->packet_index,
1055 struct packet_index, 0) =
1056 g_array_index(pos->packet_index,
1057 struct packet_index, 1);
1058 prev_index = &g_array_index(pos->packet_index,
1059 struct packet_index, 0);
1060 cur_index = &g_array_index(pos->packet_index,
1061 struct packet_index, 1);
1062 break;
1063 default:
1064 abort();
1065 break;
1066 }
1067 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1068 ret = get_next_index(session->ctx, viewer_stream, cur_index);
1069 if (ret < 0) {
1070 pos->offset = EOF;
1071 fprintf(stderr, "[error] get_next_index failed\n");
1072 return;
1073 }
1074
1075 pos->packet_size = cur_index->packet_size;
1076 pos->content_size = cur_index->content_size;
1077 pos->mmap_base_offset = 0;
1078 if (cur_index->offset == EOF) {
1079 pos->offset = EOF;
1080 } else {
1081 pos->offset = 0;
1082 }
1083
1084 if (cur_index->content_size == 0) {
1085 file_stream->parent.cycles_timestamp =
1086 cur_index->ts_cycles.timestamp_end;
1087 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1088 &file_stream->parent,
1089 cur_index->ts_cycles.timestamp_end);
1090 } else {
1091 /* Convert the timestamps and append to the real_index. */
1092 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1093 &file_stream->parent,
1094 cur_index->ts_cycles.timestamp_begin);
1095 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1096 &file_stream->parent,
1097 cur_index->ts_cycles.timestamp_end);
1098
1099 ctf_update_current_packet_index(&file_stream->parent,
1100 prev_index, cur_index);
1101
1102 file_stream->parent.cycles_timestamp =
1103 cur_index->ts_cycles.timestamp_begin;
1104 file_stream->parent.real_timestamp =
1105 cur_index->ts_real.timestamp_begin;
1106 }
1107
1108 if (pos->packet_size == 0 || pos->offset == EOF) {
1109 goto end;
1110 }
1111
1112 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1113 viewer_stream->id);
1114 ret = get_data_packet(session->ctx, pos, viewer_stream,
1115 be64toh(cur_index->offset),
1116 cur_index->packet_size / CHAR_BIT);
1117 if (ret == -2) {
1118 goto retry;
1119 } else if (ret < 0) {
1120 pos->offset = EOF;
1121 fprintf(stderr, "[error] get_data_packet failed\n");
1122 return;
1123 }
1124
1125 printf_verbose("Index received : packet_size : %" PRIu64
1126 ", offset %" PRIu64 ", content_size %" PRIu64
1127 ", timestamp_end : %" PRIu64 "\n",
1128 cur_index->packet_size, cur_index->offset,
1129 cur_index->content_size,
1130 cur_index->ts_cycles.timestamp_end);
1131
1132 /* update trace_packet_header and stream_packet_context */
1133 if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1134 /* Read packet header */
1135 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1136 if (ret) {
1137 pos->offset = EOF;
1138 fprintf(stderr, "[error] trace packet header read failed\n");
1139 goto end;
1140 }
1141 }
1142 if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1143 /* Read packet context */
1144 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1145 if (ret) {
1146 pos->offset = EOF;
1147 fprintf(stderr, "[error] stream packet context read failed\n");
1148 goto end;
1149 }
1150 }
1151 pos->data_offset = pos->offset;
1152
1153 end:
1154 return;
1155 }
1156
1157 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1158 {
1159 struct lttng_viewer_cmd cmd;
1160 struct lttng_viewer_create_session_response resp;
1161 int ret;
1162 ssize_t ret_len;
1163
1164 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1165 cmd.data_size = 0;
1166 cmd.cmd_version = 0;
1167
1168 do {
1169 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
1170 } while (ret_len < 0 && errno == EINTR);
1171 if (ret_len < 0) {
1172 perror("[error] Error sending cmd");
1173 ret = ret_len;
1174 goto error;
1175 }
1176 assert(ret_len == sizeof(cmd));
1177
1178 do {
1179 ret_len = recv(ctx->control_sock, &resp, sizeof(resp), 0);
1180 } while (ret_len < 0 && errno == EINTR);
1181 if (ret_len == 0) {
1182 fprintf(stderr, "[error] Remote side has closed connection\n");
1183 ret = -1;
1184 goto error;
1185 }
1186 if (ret_len < 0) {
1187 perror("[error] Error receiving create session reply");
1188 ret = ret_len;
1189 goto error;
1190 }
1191 assert(ret_len == sizeof(resp));
1192
1193 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1194 fprintf(stderr, "[error] Error creating viewer session\n");
1195 ret = -1;
1196 goto error;
1197 }
1198 ret = 0;
1199
1200 error:
1201 return ret;
1202 }
1203
1204 static
1205 int del_traces(gpointer key, gpointer value, gpointer user_data)
1206 {
1207 struct bt_context *bt_ctx = user_data;
1208 struct lttng_live_ctf_trace *trace = value;
1209 int ret;
1210
1211 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1212 if (ret < 0)
1213 fprintf(stderr, "[error] removing trace from context\n");
1214
1215 /* remove the key/value pair from the HT. */
1216 return 1;
1217 }
1218
1219 static
1220 void add_traces(gpointer key, gpointer value, gpointer user_data)
1221 {
1222 int i, ret;
1223 struct bt_context *bt_ctx = user_data;
1224 struct lttng_live_ctf_trace *trace = value;
1225 struct lttng_live_viewer_stream *stream;
1226 struct bt_mmap_stream *new_mmap_stream;
1227 struct bt_mmap_stream_list mmap_list;
1228 struct lttng_live_ctx *ctx = NULL;
1229 struct bt_trace_descriptor *td;
1230 struct bt_trace_handle *handle;
1231
1232 /*
1233 * We don't know how many streams we will receive for a trace, so
1234 * once we are done receiving the traces, we add all the traces
1235 * received to the bt_context.
1236 * We can receive streams during the attach command or the
1237 * get_new_streams, so we have to make sure not to add multiple
1238 * times the same traces.
1239 * If a trace is already in the context, we just skip this function.
1240 */
1241 if (trace->in_use)
1242 return;
1243
1244 BT_INIT_LIST_HEAD(&mmap_list.head);
1245
1246 for (i = 0; i < trace->streams->len; i++) {
1247 stream = g_ptr_array_index(trace->streams, i);
1248 ctx = stream->session->ctx;
1249
1250 if (!stream->metadata_flag) {
1251 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1252 new_mmap_stream->priv = (void *) stream;
1253 new_mmap_stream->fd = -1;
1254 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1255 } else {
1256 char *metadata_buf = NULL;
1257
1258 /* Get all possible metadata before starting */
1259 ret = get_new_metadata(ctx, stream, &metadata_buf);
1260 if (ret) {
1261 free(metadata_buf);
1262 goto end_free;
1263 }
1264 if (!stream->metadata_len) {
1265 fprintf(stderr, "[error] empty metadata\n");
1266 ret = -1;
1267 free(metadata_buf);
1268 goto end_free;
1269 }
1270
1271 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1272 stream->metadata_len, "rb");
1273 if (!trace->metadata_fp) {
1274 perror("Metadata fmemopen");
1275 ret = -1;
1276 free(metadata_buf);
1277 goto end_free;
1278 }
1279 }
1280 }
1281
1282 if (!trace->metadata_fp) {
1283 fprintf(stderr, "[error] No metadata stream opened\n");
1284 goto end_free;
1285 }
1286
1287 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1288 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1289 if (ret < 0) {
1290 fprintf(stderr, "[error] Error adding trace\n");
1291 goto end_free;
1292 }
1293 trace->metadata_stream->metadata_len = 0;
1294
1295 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1296 bt_ctx->trace_handles,
1297 (gpointer) (unsigned long) ret);
1298 td = handle->td;
1299 trace->handle = handle;
1300 if (bt_ctx->current_iterator) {
1301 bt_iter_add_trace(bt_ctx->current_iterator, td);
1302 }
1303
1304 trace->trace_id = ret;
1305 trace->in_use = 1;
1306
1307 goto end;
1308
1309 end_free:
1310 bt_context_put(bt_ctx);
1311 end:
1312 return;
1313 }
1314
1315 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1316 {
1317 struct lttng_viewer_cmd cmd;
1318 struct lttng_viewer_new_streams_request rq;
1319 struct lttng_viewer_new_streams_response rp;
1320 struct lttng_viewer_stream stream;
1321 int ret, i;
1322 ssize_t ret_len;
1323 uint32_t stream_count;
1324
1325 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1326 cmd.data_size = sizeof(rq);
1327 cmd.cmd_version = 0;
1328
1329 memset(&rq, 0, sizeof(rq));
1330 rq.session_id = htobe64(id);
1331
1332 do {
1333 ret_len = send(ctx->control_sock, &cmd, sizeof(cmd), 0);
1334 } while (ret_len < 0 && errno == EINTR);
1335 if (ret_len < 0) {
1336 perror("[error] Error sending cmd");
1337 ret = ret_len;
1338 goto error;
1339 }
1340 assert(ret_len == sizeof(cmd));
1341
1342 do {
1343 ret_len = send(ctx->control_sock, &rq, sizeof(rq), 0);
1344 } while (ret_len < 0 && errno == EINTR);
1345 if (ret_len < 0) {
1346 perror("[error] Error sending get_new_streams request");
1347 ret = ret_len;
1348 goto error;
1349 }
1350 assert(ret_len == sizeof(rq));
1351
1352 do {
1353 ret_len = recv(ctx->control_sock, &rp, sizeof(rp), 0);
1354 } while (ret_len < 0 && errno == EINTR);
1355 if (ret_len == 0) {
1356 fprintf(stderr, "[error] Remote side has closed connection\n");
1357 ret = -1;
1358 goto error;
1359 }
1360 if (ret_len < 0) {
1361 perror("[error] Error receiving get_new_streams response");
1362 ret = ret_len;
1363 goto error;
1364 }
1365 assert(ret_len == sizeof(rp));
1366
1367 switch(be32toh(rp.status)) {
1368 case LTTNG_VIEWER_NEW_STREAMS_OK:
1369 break;
1370 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1371 ret = 0;
1372 goto end;
1373 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1374 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1375 goto end;
1376 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1377 fprintf(stderr, "[error] get_new_streams error\n");
1378 ret = -1;
1379 goto end;
1380 default:
1381 fprintf(stderr, "[error] Unknown return code %u\n",
1382 be32toh(rp.status));
1383 ret = -1;
1384 goto end;
1385 }
1386
1387 stream_count = be32toh(rp.streams_count);
1388 ctx->session->stream_count += stream_count;
1389 /*
1390 * When the session is created but not started, we do an active wait
1391 * until it starts. It allows the viewer to start processing the trace
1392 * as soon as the session starts.
1393 */
1394 if (ctx->session->stream_count == 0) {
1395 ret = 0;
1396 goto end;
1397 }
1398 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1399 ctx->session->stream_count);
1400 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1401 ctx->session->stream_count);
1402 for (i = 0; i < stream_count; i++) {
1403 do {
1404 ret_len = recv(ctx->control_sock, &stream, sizeof(stream), 0);
1405 } while (ret_len < 0 && errno == EINTR);
1406 if (ret_len == 0) {
1407 fprintf(stderr, "[error] Remote side has closed connection\n");
1408 ret = -1;
1409 goto error;
1410 }
1411 if (ret_len < 0) {
1412 perror("[error] Error receiving stream");
1413 ret = ret_len;
1414 goto error;
1415 }
1416 assert(ret_len == sizeof(stream));
1417 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1418 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1419
1420 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1421 be64toh(stream.id), stream.path_name,
1422 stream.channel_name);
1423 ctx->session->streams[i].id = be64toh(stream.id);
1424 ctx->session->streams[i].session = ctx->session;
1425
1426 ctx->session->streams[i].first_read = 1;
1427 ctx->session->streams[i].mmap_size = 0;
1428
1429 if (be32toh(stream.metadata_flag)) {
1430 ctx->session->streams[i].metadata_flag = 1;
1431 }
1432 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1433 be64toh(stream.ctf_trace_id));
1434 if (ret < 0) {
1435 goto error;
1436 }
1437
1438 }
1439 ret = 0;
1440
1441 end:
1442 error:
1443 return ret;
1444 }
1445
1446 void lttng_live_read(struct lttng_live_ctx *ctx)
1447 {
1448 int ret, i;
1449 struct bt_ctf_iter *iter;
1450 const struct bt_ctf_event *event;
1451 struct bt_iter_pos begin_pos;
1452 struct bt_trace_descriptor *td_write;
1453 struct bt_format *fmt_write;
1454 struct ctf_text_stream_pos *sout;
1455 uint64_t id;
1456
1457 ctx->bt_ctx = bt_context_create();
1458 if (!ctx->bt_ctx) {
1459 fprintf(stderr, "[error] bt_context_create allocation\n");
1460 goto end;
1461 }
1462
1463 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1464 if (!fmt_write) {
1465 fprintf(stderr, "[error] ctf-text error\n");
1466 goto end;
1467 }
1468
1469 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1470 if (!td_write) {
1471 fprintf(stderr, "[error] Error opening output trace\n");
1472 goto end_free;
1473 }
1474
1475 sout = container_of(td_write, struct ctf_text_stream_pos,
1476 trace_descriptor);
1477 if (!sout->parent.event_cb)
1478 goto end_free;
1479
1480 ret = lttng_live_create_viewer_session(ctx);
1481 if (ret < 0) {
1482 goto end_free;
1483 }
1484
1485 for (i = 0; i < ctx->session_ids->len; i++) {
1486 id = g_array_index(ctx->session_ids, uint64_t, i);
1487 printf_verbose("Attaching to session %lu\n", id);
1488 ret = lttng_live_attach_session(ctx, id);
1489 printf_verbose("Attaching session returns %d\n", ret);
1490 if (ret < 0) {
1491 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1492 fprintf(stderr, "[error] Unknown session ID\n");
1493 }
1494 goto end_free;
1495 }
1496 }
1497
1498 /*
1499 * As long as the session is active, we try to get new streams.
1500 */
1501 for (;;) {
1502 int flags;
1503
1504 while (!ctx->session->stream_count) {
1505 if (ctx->session_ids->len == 0)
1506 goto end_free;
1507 ret = ask_new_streams(ctx);
1508 if (ret < 0)
1509 goto end_free;
1510 }
1511
1512 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1513 ctx->bt_ctx);
1514
1515 begin_pos.type = BT_SEEK_BEGIN;
1516 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1517 if (!iter) {
1518 fprintf(stderr, "[error] Iterator creation error\n");
1519 goto end;
1520 }
1521 for (;;) {
1522 event = bt_ctf_iter_read_event_flags(iter, &flags);
1523 if (!(flags & BT_ITER_FLAG_RETRY)) {
1524 if (!event) {
1525 /* End of trace */
1526 break;
1527 }
1528 ret = sout->parent.event_cb(&sout->parent,
1529 event->parent->stream);
1530 if (ret) {
1531 fprintf(stderr, "[error] Writing "
1532 "event failed.\n");
1533 goto end_free;
1534 }
1535 }
1536 ret = bt_iter_next(bt_ctf_get_iter(iter));
1537 if (ret < 0) {
1538 goto end_free;
1539 }
1540 }
1541 bt_ctf_iter_destroy(iter);
1542 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1543 del_traces, ctx->bt_ctx);
1544 ctx->session->stream_count = 0;
1545 }
1546
1547 end_free:
1548 bt_context_put(ctx->bt_ctx);
1549 end:
1550 return;
1551 }
BabelTrace - Trace Format Babel Tower
This page took 0.077371 seconds and 3 git commands to generate.