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3aad981008bbe02022ecce743fb7de2e9c6ee2c9
[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 #include <poll.h>
37
38 #include <babeltrace/ctf/ctf-index.h>
39
40 #include <babeltrace/babeltrace.h>
41 #include <babeltrace/ctf/events.h>
42 #include <babeltrace/ctf/callbacks.h>
43 #include <babeltrace/ctf/iterator.h>
44
45 /* for packet_index */
46 #include <babeltrace/ctf/types.h>
47
48 #include <babeltrace/ctf/metadata.h>
49 #include <babeltrace/ctf-text/types.h>
50 #include <babeltrace/ctf/events-internal.h>
51 #include <formats/ctf/events-private.h>
52
53 #include <babeltrace/endian.h>
54 #include <babeltrace/compat/memstream.h>
55
56 #include "lttng-live.h"
57 #include "lttng-viewer-abi.h"
58
59 #define ACTIVE_POLL_DELAY 100 /* ms */
60
61 /*
62 * Memory allocation zeroed
63 */
64 #define zmalloc(x) calloc(1, x)
65
66 #ifndef max_t
67 #define max_t(type, a, b) \
68 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
69 #endif
70
71 static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
72 size_t index, int whence);
73 static void add_traces(gpointer key, gpointer value, gpointer user_data);
74 static int del_traces(gpointer key, gpointer value, gpointer user_data);
75 static int get_new_metadata(struct lttng_live_ctx *ctx,
76 struct lttng_live_viewer_stream *viewer_stream,
77 char **metadata_buf);
78
79 static
80 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
81 {
82 ssize_t ret;
83 size_t copied = 0, to_copy = len;
84
85 do {
86 ret = recv(fd, buf + copied, to_copy, 0);
87 if (ret > 0) {
88 assert(ret <= to_copy);
89 copied += ret;
90 to_copy -= ret;
91 }
92 } while ((ret > 0 && to_copy > 0)
93 || (ret < 0 && errno == EINTR));
94 if (ret > 0)
95 ret = copied;
96 /* ret = 0 means orderly shutdown, ret < 0 is error. */
97 return ret;
98 }
99
100 static
101 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
102 {
103 ssize_t ret;
104
105 do {
106 ret = send(fd, buf, len, MSG_NOSIGNAL);
107 } while (ret < 0 && errno == EINTR);
108 return ret;
109 }
110
111 int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
112 {
113 struct hostent *host;
114 struct sockaddr_in server_addr;
115 int ret;
116
117 if (lttng_live_should_quit()) {
118 ret = -1;
119 goto end;
120 }
121
122 host = gethostbyname(ctx->relay_hostname);
123 if (!host) {
124 fprintf(stderr, "[error] Cannot lookup hostname %s\n",
125 ctx->relay_hostname);
126 goto error;
127 }
128
129 if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
130 perror("Socket");
131 goto error;
132 }
133
134 server_addr.sin_family = AF_INET;
135 server_addr.sin_port = htons(ctx->port);
136 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
137 bzero(&(server_addr.sin_zero), 8);
138
139 if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
140 sizeof(struct sockaddr)) == -1) {
141 perror("Connect");
142 goto error;
143 }
144
145 ret = 0;
146
147 end:
148 return ret;
149
150 error:
151 fprintf(stderr, "[error] Connection failed\n");
152 return -1;
153 }
154
155 int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
156 {
157 struct lttng_viewer_cmd cmd;
158 struct lttng_viewer_connect connect;
159 int ret;
160 ssize_t ret_len;
161
162 if (lttng_live_should_quit()) {
163 ret = -1;
164 goto end;
165 }
166
167 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
168 cmd.data_size = sizeof(connect);
169 cmd.cmd_version = 0;
170
171 connect.viewer_session_id = -1ULL; /* will be set on recv */
172 connect.major = htobe32(LTTNG_LIVE_MAJOR);
173 connect.minor = htobe32(LTTNG_LIVE_MINOR);
174 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
175
176 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
177 if (ret_len < 0) {
178 perror("[error] Error sending cmd");
179 goto error;
180 }
181 assert(ret_len == sizeof(cmd));
182
183 ret_len = lttng_live_send(ctx->control_sock, &connect, sizeof(connect));
184 if (ret_len < 0) {
185 perror("[error] Error sending version");
186 goto error;
187 }
188 assert(ret_len == sizeof(connect));
189
190 ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect));
191 if (ret_len == 0) {
192 fprintf(stderr, "[error] Remote side has closed connection\n");
193 goto error;
194 }
195 if (ret_len < 0) {
196 perror("[error] Error receiving version");
197 goto error;
198 }
199 assert(ret_len == sizeof(connect));
200
201 printf_verbose("Received viewer session ID : %" PRIu64 "\n",
202 be64toh(connect.viewer_session_id));
203 printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
204 be32toh(connect.minor));
205 ret = 0;
206 end:
207 return ret;
208
209 error:
210 fprintf(stderr, "[error] Unable to establish connection\n");
211 return -1;
212 }
213
214 static
215 void free_session_list(GPtrArray *session_list)
216 {
217 int i;
218 struct lttng_live_relay_session *relay_session;
219
220 for (i = 0; i < session_list->len; i++) {
221 relay_session = g_ptr_array_index(session_list, i);
222 free(relay_session->name);
223 free(relay_session->hostname);
224 }
225 g_ptr_array_free(session_list, TRUE);
226 }
227
228 static
229 void print_session_list(GPtrArray *session_list, const char *path)
230 {
231 int i;
232 struct lttng_live_relay_session *relay_session;
233
234 for (i = 0; i < session_list->len; i++) {
235 relay_session = g_ptr_array_index(session_list, i);
236 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
237 "%u stream(s), %u client(s) connected)\n",
238 path, relay_session->hostname,
239 relay_session->name, relay_session->timer,
240 relay_session->streams, relay_session->clients);
241 }
242 }
243
244 static
245 void update_session_list(GPtrArray *session_list, char *hostname,
246 char *session_name, uint32_t streams, uint32_t clients,
247 uint32_t timer)
248 {
249 int i, found = 0;
250 struct lttng_live_relay_session *relay_session;
251
252 for (i = 0; i < session_list->len; i++) {
253 relay_session = g_ptr_array_index(session_list, i);
254 if ((strncmp(relay_session->hostname, hostname, NAME_MAX) == 0) &&
255 strncmp(relay_session->name,
256 session_name, NAME_MAX) == 0) {
257 relay_session->streams += streams;
258 if (relay_session->clients < clients)
259 relay_session->clients = clients;
260 found = 1;
261 break;
262 }
263 }
264 if (found)
265 return;
266
267 relay_session = g_new0(struct lttng_live_relay_session, 1);
268 relay_session->hostname = strndup(hostname, NAME_MAX);
269 relay_session->name = strndup(session_name, NAME_MAX);
270 relay_session->clients = clients;
271 relay_session->streams = streams;
272 relay_session->timer = timer;
273 g_ptr_array_add(session_list, relay_session);
274 }
275
276 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
277 {
278 struct lttng_viewer_cmd cmd;
279 struct lttng_viewer_list_sessions list;
280 struct lttng_viewer_session lsession;
281 int i, ret, sessions_count, print_list = 0;
282 ssize_t ret_len;
283 uint64_t session_id;
284 GPtrArray *session_list = NULL;
285
286 if (lttng_live_should_quit()) {
287 ret = -1;
288 goto end;
289 }
290
291 if (strlen(ctx->session_name) == 0) {
292 print_list = 1;
293 session_list = g_ptr_array_new();
294 }
295
296 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
297 cmd.data_size = 0;
298 cmd.cmd_version = 0;
299
300 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
301 if (ret_len < 0) {
302 perror("[error] Error sending cmd");
303 goto error;
304 }
305 assert(ret_len == sizeof(cmd));
306
307 ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
308 if (ret_len == 0) {
309 fprintf(stderr, "[error] Remote side has closed connection\n");
310 goto error;
311 }
312 if (ret_len < 0) {
313 perror("[error] Error receiving session list");
314 goto error;
315 }
316 assert(ret_len == sizeof(list));
317
318 sessions_count = be32toh(list.sessions_count);
319 for (i = 0; i < sessions_count; i++) {
320 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
321 if (ret_len == 0) {
322 fprintf(stderr, "[error] Remote side has closed connection\n");
323 goto error;
324 }
325 if (ret_len < 0) {
326 perror("[error] Error receiving session");
327 goto error;
328 }
329 assert(ret_len == sizeof(lsession));
330 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
331 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
332 session_id = be64toh(lsession.id);
333
334 if (print_list) {
335 update_session_list(session_list,
336 lsession.hostname,
337 lsession.session_name,
338 be32toh(lsession.streams),
339 be32toh(lsession.clients),
340 be32toh(lsession.live_timer));
341 } else {
342 if ((strncmp(lsession.session_name, ctx->session_name,
343 NAME_MAX) == 0) && (strncmp(lsession.hostname,
344 ctx->traced_hostname, NAME_MAX) == 0)) {
345 printf_verbose("Reading from session %" PRIu64 "\n",
346 session_id);
347 g_array_append_val(ctx->session_ids,
348 session_id);
349 }
350 }
351 }
352
353 if (print_list) {
354 print_session_list(session_list, path);
355 free_session_list(session_list);
356 }
357 ret = 0;
358 end:
359 return ret;
360
361 error:
362 fprintf(stderr, "[error] Unable to list sessions\n");
363 return -1;
364 }
365
366 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
367 uint64_t ctf_trace_id)
368 {
369 struct lttng_live_ctf_trace *trace;
370 int ret = 0;
371
372 trace = g_hash_table_lookup(stream->session->ctf_traces,
373 (gpointer) ctf_trace_id);
374 if (!trace) {
375 trace = g_new0(struct lttng_live_ctf_trace, 1);
376 trace->ctf_trace_id = ctf_trace_id;
377 trace->streams = g_ptr_array_new();
378 g_hash_table_insert(stream->session->ctf_traces,
379 (gpointer) ctf_trace_id,
380 trace);
381 }
382 if (stream->metadata_flag)
383 trace->metadata_stream = stream;
384
385 stream->ctf_trace = trace;
386 g_ptr_array_add(trace->streams, stream);
387
388 return ret;
389 }
390
391 static
392 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
393 char **metadata_buf, size_t *size)
394 {
395 int ret = 0;
396
397 stream->metadata_fp_write =
398 babeltrace_open_memstream(metadata_buf, size);
399 if (!stream->metadata_fp_write) {
400 perror("Metadata open_memstream");
401 ret = -1;
402 }
403
404 return ret;
405 }
406
407 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
408 {
409 struct lttng_viewer_cmd cmd;
410 struct lttng_viewer_attach_session_request rq;
411 struct lttng_viewer_attach_session_response rp;
412 struct lttng_viewer_stream stream;
413 int ret, i;
414 ssize_t ret_len;
415
416 if (lttng_live_should_quit()) {
417 ret = -1;
418 goto end;
419 }
420
421 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
422 cmd.data_size = sizeof(rq);
423 cmd.cmd_version = 0;
424
425 memset(&rq, 0, sizeof(rq));
426 rq.session_id = htobe64(id);
427 // TODO: add cmd line parameter to select seek beginning
428 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
429 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
430
431 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
432 if (ret_len < 0) {
433 perror("[error] Error sending cmd");
434 goto error;
435 }
436 assert(ret_len == sizeof(cmd));
437
438 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
439 if (ret_len < 0) {
440 perror("[error] Error sending attach request");
441 goto error;
442 }
443 assert(ret_len == sizeof(rq));
444
445 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
446 if (ret_len == 0) {
447 fprintf(stderr, "[error] Remote side has closed connection\n");
448 goto error;
449 }
450 if (ret_len < 0) {
451 perror("[error] Error receiving attach response");
452 goto error;
453 }
454 assert(ret_len == sizeof(rp));
455
456 switch(be32toh(rp.status)) {
457 case LTTNG_VIEWER_ATTACH_OK:
458 break;
459 case LTTNG_VIEWER_ATTACH_UNK:
460 ret = -LTTNG_VIEWER_ATTACH_UNK;
461 goto end;
462 case LTTNG_VIEWER_ATTACH_ALREADY:
463 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
464 goto error;
465 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
466 fprintf(stderr, "[error] Not a live session\n");
467 goto error;
468 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
469 fprintf(stderr, "[error] Wrong seek parameter\n");
470 goto error;
471 default:
472 fprintf(stderr, "[error] Unknown attach return code %u\n",
473 be32toh(rp.status));
474 goto error;
475 }
476 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
477 goto error;
478 }
479
480 ctx->session->stream_count += be32toh(rp.streams_count);
481 /*
482 * When the session is created but not started, we do an active wait
483 * until it starts. It allows the viewer to start processing the trace
484 * as soon as the session starts.
485 */
486 if (ctx->session->stream_count == 0) {
487 ret = 0;
488 goto end;
489 }
490 printf_verbose("Waiting for %" PRIu64 " streams:\n",
491 ctx->session->stream_count);
492 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
493 ctx->session->stream_count);
494 for (i = 0; i < be32toh(rp.streams_count); i++) {
495 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
496 if (ret_len == 0) {
497 fprintf(stderr, "[error] Remote side has closed connection\n");
498 goto error;
499 }
500 if (ret_len < 0) {
501 perror("[error] Error receiving stream");
502 goto error;
503 }
504 assert(ret_len == sizeof(stream));
505 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
506 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
507
508 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
509 be64toh(stream.id), stream.path_name,
510 stream.channel_name);
511 ctx->session->streams[i].id = be64toh(stream.id);
512 ctx->session->streams[i].session = ctx->session;
513
514 ctx->session->streams[i].first_read = 1;
515 ctx->session->streams[i].mmap_size = 0;
516
517 if (be32toh(stream.metadata_flag)) {
518 ctx->session->streams[i].metadata_flag = 1;
519 }
520 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
521 be64toh(stream.ctf_trace_id));
522 if (ret < 0) {
523 goto error;
524 }
525
526 }
527 ret = 0;
528 end:
529 return ret;
530
531 error:
532 return -1;
533 }
534
535 static
536 int ask_new_streams(struct lttng_live_ctx *ctx)
537 {
538 int i, ret = 0;
539 uint64_t id;
540
541 restart:
542 for (i = 0; i < ctx->session_ids->len; i++) {
543 id = g_array_index(ctx->session_ids, uint64_t, i);
544 ret = lttng_live_get_new_streams(ctx, id);
545 printf_verbose("Asking for new streams returns %d\n",
546 ret);
547 if (ret < 0) {
548 if (lttng_live_should_quit()) {
549 goto end;
550 }
551 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
552 printf_verbose("Session %" PRIu64 " closed\n",
553 id);
554 /*
555 * The streams have already been closed during
556 * the reading, so we only need to get rid of
557 * the trace in our internal table of sessions.
558 */
559 g_array_remove_index(ctx->session_ids, i);
560 /*
561 * We can't continue iterating on the g_array
562 * after a remove, we have to start again.
563 */
564 goto restart;
565 } else {
566 ret = -1;
567 goto end;
568 }
569 }
570 }
571
572 end:
573 return ret;
574 }
575
576 static
577 int append_metadata(struct lttng_live_ctx *ctx,
578 struct lttng_live_viewer_stream *viewer_stream)
579 {
580 int ret;
581 struct lttng_live_viewer_stream *metadata;
582 char *metadata_buf = NULL;
583
584 printf_verbose("get_next_index: new metadata needed\n");
585 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
586 if (ret < 0) {
587 free(metadata_buf);
588 goto error;
589 }
590
591 metadata = viewer_stream->ctf_trace->metadata_stream;
592 metadata->ctf_trace->metadata_fp =
593 babeltrace_fmemopen(metadata_buf,
594 metadata->metadata_len, "rb");
595 if (!metadata->ctf_trace->metadata_fp) {
596 perror("Metadata fmemopen");
597 free(metadata_buf);
598 ret = -1;
599 goto error;
600 }
601 ret = ctf_append_trace_metadata(
602 viewer_stream->ctf_trace->handle->td,
603 metadata->ctf_trace->metadata_fp);
604 /* We accept empty metadata packets */
605 if (ret != 0 && ret != -ENOENT) {
606 fprintf(stderr, "[error] Appending metadata\n");
607 goto error;
608 }
609 ret = 0;
610
611 error:
612 return ret;
613 }
614
615 static
616 int get_data_packet(struct lttng_live_ctx *ctx,
617 struct ctf_stream_pos *pos,
618 struct lttng_live_viewer_stream *stream, uint64_t offset,
619 uint64_t len)
620 {
621 struct lttng_viewer_cmd cmd;
622 struct lttng_viewer_get_packet rq;
623 struct lttng_viewer_trace_packet rp;
624 ssize_t ret_len;
625 int ret;
626
627 retry:
628 if (lttng_live_should_quit()) {
629 ret = -1;
630 goto end;
631 }
632 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
633 cmd.data_size = sizeof(rq);
634 cmd.cmd_version = 0;
635
636 memset(&rq, 0, sizeof(rq));
637 rq.stream_id = htobe64(stream->id);
638 rq.offset = htobe64(offset);
639 rq.len = htobe32(len);
640
641 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
642 if (ret_len < 0) {
643 perror("[error] Error sending cmd");
644 goto error;
645 }
646 assert(ret_len == sizeof(cmd));
647
648 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
649 if (ret_len < 0) {
650 perror("[error] Error sending get_data_packet request");
651 goto error;
652 }
653 assert(ret_len == sizeof(rq));
654
655 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
656 if (ret_len == 0) {
657 fprintf(stderr, "[error] Remote side has closed connection\n");
658 goto error;
659 }
660 if (ret_len < 0) {
661 perror("[error] Error receiving data response");
662 goto error;
663 }
664 if (ret_len != sizeof(rp)) {
665 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
666 ", received %" PRId64 "\n", sizeof(rp),
667 ret_len);
668 goto error;
669 }
670
671 rp.flags = be32toh(rp.flags);
672
673 switch (be32toh(rp.status)) {
674 case LTTNG_VIEWER_GET_PACKET_OK:
675 len = be32toh(rp.len);
676 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
677 "\n", len);
678 break;
679 case LTTNG_VIEWER_GET_PACKET_RETRY:
680 /* Unimplemented by relay daemon */
681 printf_verbose("get_data_packet: retry\n");
682 goto error;
683 case LTTNG_VIEWER_GET_PACKET_ERR:
684 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
685 printf_verbose("get_data_packet: new metadata needed\n");
686 ret = append_metadata(ctx, stream);
687 if (ret)
688 goto error;
689 }
690 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
691 printf_verbose("get_data_packet: new streams needed\n");
692 ret = ask_new_streams(ctx);
693 if (ret < 0)
694 goto error;
695 g_hash_table_foreach(ctx->session->ctf_traces,
696 add_traces, ctx->bt_ctx);
697 }
698 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
699 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
700 goto retry;
701 }
702 fprintf(stderr, "[error] get_data_packet: error\n");
703 goto error;
704 case LTTNG_VIEWER_GET_PACKET_EOF:
705 ret = -2;
706 goto end;
707 default:
708 printf_verbose("get_data_packet: unknown\n");
709 goto error;
710 }
711
712 if (len == 0) {
713 goto error;
714 }
715
716 if (len > stream->mmap_size) {
717 uint64_t new_size;
718
719 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
720 if (pos->base_mma) {
721 /* unmap old base */
722 ret = munmap_align(pos->base_mma);
723 if (ret) {
724 perror("[error] Unable to unmap old base");
725 goto error;
726 }
727 pos->base_mma = NULL;
728 }
729 pos->base_mma = mmap_align(new_size,
730 PROT_READ | PROT_WRITE,
731 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
732 if (pos->base_mma == MAP_FAILED) {
733 perror("[error] mmap error");
734 pos->base_mma = NULL;
735 goto error;
736 }
737
738 stream->mmap_size = new_size;
739 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
740 stream->mmap_size);
741 }
742
743 ret_len = lttng_live_recv(ctx->control_sock,
744 mmap_align_addr(pos->base_mma), len);
745 if (ret_len == 0) {
746 fprintf(stderr, "[error] Remote side has closed connection\n");
747 goto error;
748 }
749 if (ret_len < 0) {
750 perror("[error] Error receiving trace packet");
751 goto error;
752 }
753 assert(ret_len == len);
754 ret = 0;
755 end:
756 return ret;
757
758 error:
759 return -1;
760 }
761
762 static
763 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
764 struct lttng_live_viewer_stream *metadata_stream)
765 {
766 uint64_t len = 0;
767 int ret;
768 struct lttng_viewer_cmd cmd;
769 struct lttng_viewer_get_metadata rq;
770 struct lttng_viewer_metadata_packet rp;
771 char *data = NULL;
772 ssize_t ret_len;
773
774 if (lttng_live_should_quit()) {
775 ret = -1;
776 goto end;
777 }
778
779 rq.stream_id = htobe64(metadata_stream->id);
780 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
781 cmd.data_size = sizeof(rq);
782 cmd.cmd_version = 0;
783
784 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
785 if (ret_len < 0) {
786 perror("[error] Error sending cmd");
787 goto error;
788 }
789 assert(ret_len == sizeof(cmd));
790
791 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
792 if (ret_len < 0) {
793 perror("[error] Error sending get_metadata request");
794 goto error;
795 }
796 assert(ret_len == sizeof(rq));
797
798 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
799 if (ret_len == 0) {
800 fprintf(stderr, "[error] Remote side has closed connection\n");
801 goto error;
802 }
803 if (ret_len < 0) {
804 perror("[error] Error receiving metadata response");
805 goto error;
806 }
807 assert(ret_len == sizeof(rp));
808
809 switch (be32toh(rp.status)) {
810 case LTTNG_VIEWER_METADATA_OK:
811 printf_verbose("get_metadata : OK\n");
812 break;
813 case LTTNG_VIEWER_NO_NEW_METADATA:
814 printf_verbose("get_metadata : NO NEW\n");
815 ret = 0;
816 goto end;
817 case LTTNG_VIEWER_METADATA_ERR:
818 printf_verbose("get_metadata : ERR\n");
819 goto error;
820 default:
821 printf_verbose("get_metadata : UNKNOWN\n");
822 goto error;
823 }
824
825 len = be64toh(rp.len);
826 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
827 if (len <= 0) {
828 goto error;
829 }
830
831 data = zmalloc(len);
832 if (!data) {
833 perror("relay data zmalloc");
834 goto error;
835 }
836 ret_len = lttng_live_recv(ctx->control_sock, data, len);
837 if (ret_len == 0) {
838 fprintf(stderr, "[error] Remote side has closed connection\n");
839 goto error_free_data;
840 }
841 if (ret_len < 0) {
842 perror("[error] Error receiving trace packet");
843 goto error_free_data;
844 }
845 assert(ret_len == len);
846
847 do {
848 ret_len = fwrite(data, 1, len,
849 metadata_stream->metadata_fp_write);
850 } while (ret_len < 0 && errno == EINTR);
851 if (ret_len < 0) {
852 fprintf(stderr, "[error] Writing in the metadata fp\n");
853 goto error_free_data;
854 }
855 assert(ret_len == len);
856 metadata_stream->metadata_len += len;
857 free(data);
858 ret = len;
859 end:
860 return ret;
861
862 error_free_data:
863 free(data);
864 error:
865 return -1;
866 }
867
868 /*
869 * Return 0 on success, a negative value on error.
870 */
871 static
872 int get_new_metadata(struct lttng_live_ctx *ctx,
873 struct lttng_live_viewer_stream *viewer_stream,
874 char **metadata_buf)
875 {
876 int ret = 0;
877 struct lttng_live_viewer_stream *metadata_stream;
878 size_t size, len_read = 0;;
879
880 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
881 if (!metadata_stream) {
882 fprintf(stderr, "[error] No metadata stream\n");
883 ret = -1;
884 goto error;
885 }
886 metadata_stream->metadata_len = 0;
887 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
888 if (ret < 0) {
889 goto error;
890 }
891
892 do {
893 /*
894 * get_one_metadata_packet returns the number of bytes
895 * received, 0 when we have received everything, a
896 * negative value on error.
897 */
898 ret = get_one_metadata_packet(ctx, metadata_stream);
899 if (ret > 0) {
900 len_read += ret;
901 }
902 if (!len_read) {
903 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
904 }
905 } while (ret > 0 || !len_read);
906
907 if (fclose(metadata_stream->metadata_fp_write))
908 perror("fclose");
909 metadata_stream->metadata_fp_write = NULL;
910
911 error:
912 return ret;
913 }
914
915 /*
916 * Get one index for a stream.
917 *
918 * Returns 0 on success or a negative value on error.
919 */
920 static
921 int get_next_index(struct lttng_live_ctx *ctx,
922 struct lttng_live_viewer_stream *viewer_stream,
923 struct packet_index *index)
924 {
925 struct lttng_viewer_cmd cmd;
926 struct lttng_viewer_get_next_index rq;
927 struct lttng_viewer_index rp;
928 int ret;
929 ssize_t ret_len;
930
931 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
932 cmd.data_size = sizeof(rq);
933 cmd.cmd_version = 0;
934
935 memset(&rq, 0, sizeof(rq));
936 rq.stream_id = htobe64(viewer_stream->id);
937
938 retry:
939 if (lttng_live_should_quit()) {
940 ret = -1;
941 goto end;
942 }
943 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
944 if (ret_len < 0) {
945 perror("[error] Error sending cmd");
946 goto error;
947 }
948 assert(ret_len == sizeof(cmd));
949
950 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
951 if (ret_len < 0) {
952 perror("[error] Error sending get_next_index request");
953 goto error;
954 }
955 assert(ret_len == sizeof(rq));
956
957 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
958 if (ret_len == 0) {
959 fprintf(stderr, "[error] Remote side has closed connection\n");
960 goto error;
961 }
962 if (ret_len < 0) {
963 perror("[error] Error receiving index response");
964 goto error;
965 }
966 assert(ret_len == sizeof(rp));
967
968 rp.flags = be32toh(rp.flags);
969
970 switch (be32toh(rp.status)) {
971 case LTTNG_VIEWER_INDEX_INACTIVE:
972 printf_verbose("get_next_index: inactive\n");
973 memset(index, 0, sizeof(struct packet_index));
974 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
975 break;
976 case LTTNG_VIEWER_INDEX_OK:
977 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
978 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
979 index->offset = be64toh(rp.offset);
980 index->packet_size = be64toh(rp.packet_size);
981 index->content_size = be64toh(rp.content_size);
982 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
983 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
984 index->events_discarded = be64toh(rp.events_discarded);
985
986 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
987 ret = append_metadata(ctx, viewer_stream);
988 if (ret)
989 goto error;
990 }
991 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
992 ret = ask_new_streams(ctx);
993 if (ret < 0)
994 goto error;
995 g_hash_table_foreach(ctx->session->ctf_traces,
996 add_traces, ctx->bt_ctx);
997 }
998 break;
999 case LTTNG_VIEWER_INDEX_RETRY:
1000 printf_verbose("get_next_index: retry\n");
1001 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1002 goto retry;
1003 case LTTNG_VIEWER_INDEX_HUP:
1004 printf_verbose("get_next_index: stream hung up\n");
1005 viewer_stream->id = -1ULL;
1006 index->offset = EOF;
1007 ctx->session->stream_count--;
1008 break;
1009 case LTTNG_VIEWER_INDEX_ERR:
1010 fprintf(stderr, "[error] get_next_index: error\n");
1011 goto error;
1012 default:
1013 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1014 goto error;
1015 }
1016 ret = 0;
1017 end:
1018 return ret;
1019
1020 error:
1021 return -1;
1022 }
1023
1024 static
1025 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1026 int whence)
1027 {
1028 struct ctf_stream_pos *pos;
1029 struct ctf_file_stream *file_stream;
1030 struct packet_index *prev_index = NULL, *cur_index;
1031 struct lttng_live_viewer_stream *viewer_stream;
1032 struct lttng_live_session *session;
1033 int ret;
1034
1035 retry:
1036 pos = ctf_pos(stream_pos);
1037 file_stream = container_of(pos, struct ctf_file_stream, pos);
1038 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1039 session = viewer_stream->session;
1040
1041 switch (pos->packet_index->len) {
1042 case 0:
1043 g_array_set_size(pos->packet_index, 1);
1044 cur_index = &g_array_index(pos->packet_index,
1045 struct packet_index, 0);
1046 break;
1047 case 1:
1048 g_array_set_size(pos->packet_index, 2);
1049 prev_index = &g_array_index(pos->packet_index,
1050 struct packet_index, 0);
1051 cur_index = &g_array_index(pos->packet_index,
1052 struct packet_index, 1);
1053 break;
1054 case 2:
1055 g_array_index(pos->packet_index,
1056 struct packet_index, 0) =
1057 g_array_index(pos->packet_index,
1058 struct packet_index, 1);
1059 prev_index = &g_array_index(pos->packet_index,
1060 struct packet_index, 0);
1061 cur_index = &g_array_index(pos->packet_index,
1062 struct packet_index, 1);
1063 break;
1064 default:
1065 abort();
1066 break;
1067 }
1068 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1069 ret = get_next_index(session->ctx, viewer_stream, cur_index);
1070 if (ret < 0) {
1071 pos->offset = EOF;
1072 if (!lttng_live_should_quit()) {
1073 fprintf(stderr, "[error] get_next_index failed\n");
1074 }
1075 return;
1076 }
1077
1078 pos->packet_size = cur_index->packet_size;
1079 pos->content_size = cur_index->content_size;
1080 pos->mmap_base_offset = 0;
1081 if (cur_index->offset == EOF) {
1082 pos->offset = EOF;
1083 } else {
1084 pos->offset = 0;
1085 }
1086
1087 if (cur_index->content_size == 0) {
1088 file_stream->parent.cycles_timestamp =
1089 cur_index->ts_cycles.timestamp_end;
1090 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1091 &file_stream->parent,
1092 cur_index->ts_cycles.timestamp_end);
1093 } else {
1094 /* Convert the timestamps and append to the real_index. */
1095 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1096 &file_stream->parent,
1097 cur_index->ts_cycles.timestamp_begin);
1098 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1099 &file_stream->parent,
1100 cur_index->ts_cycles.timestamp_end);
1101
1102 ctf_update_current_packet_index(&file_stream->parent,
1103 prev_index, cur_index);
1104
1105 file_stream->parent.cycles_timestamp =
1106 cur_index->ts_cycles.timestamp_begin;
1107 file_stream->parent.real_timestamp =
1108 cur_index->ts_real.timestamp_begin;
1109 }
1110
1111 if (pos->packet_size == 0 || pos->offset == EOF) {
1112 goto end;
1113 }
1114
1115 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1116 viewer_stream->id);
1117 ret = get_data_packet(session->ctx, pos, viewer_stream,
1118 cur_index->offset,
1119 cur_index->packet_size / CHAR_BIT);
1120 if (ret == -2) {
1121 goto retry;
1122 } else if (ret < 0) {
1123 pos->offset = EOF;
1124 if (!lttng_live_should_quit()) {
1125 fprintf(stderr, "[error] get_data_packet failed\n");
1126 }
1127 return;
1128 }
1129
1130 printf_verbose("Index received : packet_size : %" PRIu64
1131 ", offset %" PRIu64 ", content_size %" PRIu64
1132 ", timestamp_end : %" PRIu64 "\n",
1133 cur_index->packet_size, cur_index->offset,
1134 cur_index->content_size,
1135 cur_index->ts_cycles.timestamp_end);
1136
1137 /* update trace_packet_header and stream_packet_context */
1138 if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1139 /* Read packet header */
1140 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1141 if (ret) {
1142 pos->offset = EOF;
1143 fprintf(stderr, "[error] trace packet header read failed\n");
1144 goto end;
1145 }
1146 }
1147 if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1148 /* Read packet context */
1149 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1150 if (ret) {
1151 pos->offset = EOF;
1152 fprintf(stderr, "[error] stream packet context read failed\n");
1153 goto end;
1154 }
1155 }
1156 pos->data_offset = pos->offset;
1157
1158 end:
1159 return;
1160 }
1161
1162 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1163 {
1164 struct lttng_viewer_cmd cmd;
1165 struct lttng_viewer_create_session_response resp;
1166 int ret;
1167 ssize_t ret_len;
1168
1169 if (lttng_live_should_quit()) {
1170 ret = -1;
1171 goto end;
1172 }
1173
1174 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1175 cmd.data_size = 0;
1176 cmd.cmd_version = 0;
1177
1178 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1179 if (ret_len < 0) {
1180 perror("[error] Error sending cmd");
1181 goto error;
1182 }
1183 assert(ret_len == sizeof(cmd));
1184
1185 ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1186 if (ret_len == 0) {
1187 fprintf(stderr, "[error] Remote side has closed connection\n");
1188 goto error;
1189 }
1190 if (ret_len < 0) {
1191 perror("[error] Error receiving create session reply");
1192 goto error;
1193 }
1194 assert(ret_len == sizeof(resp));
1195
1196 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1197 fprintf(stderr, "[error] Error creating viewer session\n");
1198 goto error;
1199 }
1200 ret = 0;
1201 end:
1202 return ret;
1203
1204 error:
1205 return -1;
1206 }
1207
1208 static
1209 int del_traces(gpointer key, gpointer value, gpointer user_data)
1210 {
1211 struct bt_context *bt_ctx = user_data;
1212 struct lttng_live_ctf_trace *trace = value;
1213 int ret;
1214
1215 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1216 if (ret < 0)
1217 fprintf(stderr, "[error] removing trace from context\n");
1218
1219 /* remove the key/value pair from the HT. */
1220 return 1;
1221 }
1222
1223 static
1224 void add_traces(gpointer key, gpointer value, gpointer user_data)
1225 {
1226 int i, ret;
1227 struct bt_context *bt_ctx = user_data;
1228 struct lttng_live_ctf_trace *trace = value;
1229 struct lttng_live_viewer_stream *stream;
1230 struct bt_mmap_stream *new_mmap_stream;
1231 struct bt_mmap_stream_list mmap_list;
1232 struct lttng_live_ctx *ctx = NULL;
1233 struct bt_trace_descriptor *td;
1234 struct bt_trace_handle *handle;
1235
1236 /*
1237 * We don't know how many streams we will receive for a trace, so
1238 * once we are done receiving the traces, we add all the traces
1239 * received to the bt_context.
1240 * We can receive streams during the attach command or the
1241 * get_new_streams, so we have to make sure not to add multiple
1242 * times the same traces.
1243 * If a trace is already in the context, we just skip this function.
1244 */
1245 if (trace->in_use)
1246 return;
1247
1248 BT_INIT_LIST_HEAD(&mmap_list.head);
1249
1250 for (i = 0; i < trace->streams->len; i++) {
1251 stream = g_ptr_array_index(trace->streams, i);
1252 ctx = stream->session->ctx;
1253
1254 if (!stream->metadata_flag) {
1255 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1256 new_mmap_stream->priv = (void *) stream;
1257 new_mmap_stream->fd = -1;
1258 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1259 } else {
1260 char *metadata_buf = NULL;
1261
1262 /* Get all possible metadata before starting */
1263 ret = get_new_metadata(ctx, stream, &metadata_buf);
1264 if (ret) {
1265 free(metadata_buf);
1266 goto end_free;
1267 }
1268 if (!stream->metadata_len) {
1269 fprintf(stderr, "[error] empty metadata\n");
1270 ret = -1;
1271 free(metadata_buf);
1272 goto end_free;
1273 }
1274
1275 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1276 stream->metadata_len, "rb");
1277 if (!trace->metadata_fp) {
1278 perror("Metadata fmemopen");
1279 ret = -1;
1280 free(metadata_buf);
1281 goto end_free;
1282 }
1283 }
1284 }
1285
1286 if (!trace->metadata_fp) {
1287 fprintf(stderr, "[error] No metadata stream opened\n");
1288 goto end_free;
1289 }
1290
1291 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1292 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1293 if (ret < 0) {
1294 fprintf(stderr, "[error] Error adding trace\n");
1295 goto end_free;
1296 }
1297 trace->metadata_stream->metadata_len = 0;
1298
1299 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1300 bt_ctx->trace_handles,
1301 (gpointer) (unsigned long) ret);
1302 td = handle->td;
1303 trace->handle = handle;
1304 if (bt_ctx->current_iterator) {
1305 bt_iter_add_trace(bt_ctx->current_iterator, td);
1306 }
1307
1308 trace->trace_id = ret;
1309 trace->in_use = 1;
1310
1311 goto end;
1312
1313 end_free:
1314 bt_context_put(bt_ctx);
1315 end:
1316 return;
1317 }
1318
1319 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1320 {
1321 struct lttng_viewer_cmd cmd;
1322 struct lttng_viewer_new_streams_request rq;
1323 struct lttng_viewer_new_streams_response rp;
1324 struct lttng_viewer_stream stream;
1325 int ret, i;
1326 ssize_t ret_len;
1327 uint32_t stream_count;
1328
1329 if (lttng_live_should_quit()) {
1330 ret = -1;
1331 goto end;
1332 }
1333
1334 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1335 cmd.data_size = sizeof(rq);
1336 cmd.cmd_version = 0;
1337
1338 memset(&rq, 0, sizeof(rq));
1339 rq.session_id = htobe64(id);
1340
1341 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1342 if (ret_len < 0) {
1343 perror("[error] Error sending cmd");
1344 goto error;
1345 }
1346 assert(ret_len == sizeof(cmd));
1347
1348 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
1349 if (ret_len < 0) {
1350 perror("[error] Error sending get_new_streams request");
1351 goto error;
1352 }
1353 assert(ret_len == sizeof(rq));
1354
1355 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1356 if (ret_len == 0) {
1357 fprintf(stderr, "[error] Remote side has closed connection\n");
1358 goto error;
1359 }
1360 if (ret_len < 0) {
1361 perror("[error] Error receiving get_new_streams response");
1362 goto error;
1363 }
1364 assert(ret_len == sizeof(rp));
1365
1366 switch(be32toh(rp.status)) {
1367 case LTTNG_VIEWER_NEW_STREAMS_OK:
1368 break;
1369 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1370 ret = 0;
1371 goto end;
1372 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1373 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1374 goto end;
1375 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1376 fprintf(stderr, "[error] get_new_streams error\n");
1377 goto error;
1378 default:
1379 fprintf(stderr, "[error] Unknown return code %u\n",
1380 be32toh(rp.status));
1381 goto error;
1382 }
1383
1384 stream_count = be32toh(rp.streams_count);
1385 ctx->session->stream_count += stream_count;
1386 /*
1387 * When the session is created but not started, we do an active wait
1388 * until it starts. It allows the viewer to start processing the trace
1389 * as soon as the session starts.
1390 */
1391 if (ctx->session->stream_count == 0) {
1392 ret = 0;
1393 goto end;
1394 }
1395 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1396 ctx->session->stream_count);
1397 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1398 ctx->session->stream_count);
1399 for (i = 0; i < stream_count; i++) {
1400 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1401 if (ret_len == 0) {
1402 fprintf(stderr, "[error] Remote side has closed connection\n");
1403 goto error;
1404 }
1405 if (ret_len < 0) {
1406 perror("[error] Error receiving stream");
1407 goto error;
1408 }
1409 assert(ret_len == sizeof(stream));
1410 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1411 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1412
1413 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1414 be64toh(stream.id), stream.path_name,
1415 stream.channel_name);
1416 ctx->session->streams[i].id = be64toh(stream.id);
1417 ctx->session->streams[i].session = ctx->session;
1418
1419 ctx->session->streams[i].first_read = 1;
1420 ctx->session->streams[i].mmap_size = 0;
1421
1422 if (be32toh(stream.metadata_flag)) {
1423 ctx->session->streams[i].metadata_flag = 1;
1424 }
1425 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1426 be64toh(stream.ctf_trace_id));
1427 if (ret < 0) {
1428 goto error;
1429 }
1430
1431 }
1432 ret = 0;
1433 end:
1434 return ret;
1435
1436 error:
1437 return -1;
1438 }
1439
1440 int lttng_live_read(struct lttng_live_ctx *ctx)
1441 {
1442 int ret = -1;
1443 int i;
1444 struct bt_ctf_iter *iter;
1445 const struct bt_ctf_event *event;
1446 struct bt_iter_pos begin_pos;
1447 struct bt_trace_descriptor *td_write;
1448 struct bt_format *fmt_write;
1449 struct ctf_text_stream_pos *sout;
1450 uint64_t id;
1451
1452 ctx->bt_ctx = bt_context_create();
1453 if (!ctx->bt_ctx) {
1454 fprintf(stderr, "[error] bt_context_create allocation\n");
1455 goto end;
1456 }
1457
1458 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1459 if (!fmt_write) {
1460 fprintf(stderr, "[error] ctf-text error\n");
1461 goto end;
1462 }
1463
1464 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1465 if (!td_write) {
1466 fprintf(stderr, "[error] Error opening output trace\n");
1467 goto end_free;
1468 }
1469
1470 sout = container_of(td_write, struct ctf_text_stream_pos,
1471 trace_descriptor);
1472 if (!sout->parent.event_cb) {
1473 goto end_free;
1474 }
1475
1476 ret = lttng_live_create_viewer_session(ctx);
1477 if (ret < 0) {
1478 goto end_free;
1479 }
1480
1481 for (i = 0; i < ctx->session_ids->len; i++) {
1482 id = g_array_index(ctx->session_ids, uint64_t, i);
1483 printf_verbose("Attaching to session %lu\n", id);
1484 ret = lttng_live_attach_session(ctx, id);
1485 printf_verbose("Attaching session returns %d\n", ret);
1486 if (ret < 0) {
1487 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1488 fprintf(stderr, "[error] Unknown session ID\n");
1489 }
1490 goto end_free;
1491 }
1492 }
1493
1494 /*
1495 * As long as the session is active, we try to get new streams.
1496 */
1497 for (;;) {
1498 int flags;
1499
1500 if (lttng_live_should_quit()) {
1501 ret = 0;
1502 goto end_free;
1503 }
1504
1505 while (!ctx->session->stream_count) {
1506 if (lttng_live_should_quit()
1507 || ctx->session_ids->len == 0) {
1508 ret = 0;
1509 goto end_free;
1510 }
1511 ret = ask_new_streams(ctx);
1512 if (ret < 0) {
1513 goto end_free;
1514 }
1515 if (!ctx->session->stream_count) {
1516 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1517 }
1518 }
1519
1520 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1521 ctx->bt_ctx);
1522
1523 begin_pos.type = BT_SEEK_BEGIN;
1524 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1525 if (!iter) {
1526 if (lttng_live_should_quit()) {
1527 ret = 0;
1528 goto end;
1529 }
1530 fprintf(stderr, "[error] Iterator creation error\n");
1531 goto end;
1532 }
1533 for (;;) {
1534 if (lttng_live_should_quit()) {
1535 ret = 0;
1536 goto end_free;
1537 }
1538 event = bt_ctf_iter_read_event_flags(iter, &flags);
1539 if (!(flags & BT_ITER_FLAG_RETRY)) {
1540 if (!event) {
1541 /* End of trace */
1542 break;
1543 }
1544 ret = sout->parent.event_cb(&sout->parent,
1545 event->parent->stream);
1546 if (ret) {
1547 fprintf(stderr, "[error] Writing "
1548 "event failed.\n");
1549 goto end_free;
1550 }
1551 }
1552 ret = bt_iter_next(bt_ctf_get_iter(iter));
1553 if (ret < 0) {
1554 goto end_free;
1555 }
1556 }
1557 bt_ctf_iter_destroy(iter);
1558 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1559 del_traces, ctx->bt_ctx);
1560 ctx->session->stream_count = 0;
1561 }
1562
1563 end_free:
1564 bt_context_put(ctx->bt_ctx);
1565 end:
1566 if (lttng_live_should_quit()) {
1567 ret = 0;
1568 }
1569 return ret;
1570 }
BabelTrace - Trace Format Babel Tower
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