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[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
206 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
207 fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n");
208 goto error;
209 }
210 /* Use the smallest protocol version implemented. */
211 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
212 ctx->minor = be32toh(connect.minor);
213 } else {
214 ctx->minor = LTTNG_LIVE_MINOR;
215 }
216 ctx->major = LTTNG_LIVE_MAJOR;
217 ret = 0;
218 end:
219 return ret;
220
221 error:
222 fprintf(stderr, "[error] Unable to establish connection\n");
223 return -1;
224 }
225
226 static
227 void free_session_list(GPtrArray *session_list)
228 {
229 int i;
230 struct lttng_live_relay_session *relay_session;
231
232 for (i = 0; i < session_list->len; i++) {
233 relay_session = g_ptr_array_index(session_list, i);
234 free(relay_session->name);
235 free(relay_session->hostname);
236 }
237 g_ptr_array_free(session_list, TRUE);
238 }
239
240 static
241 void print_session_list(GPtrArray *session_list, const char *path)
242 {
243 int i;
244 struct lttng_live_relay_session *relay_session;
245
246 for (i = 0; i < session_list->len; i++) {
247 relay_session = g_ptr_array_index(session_list, i);
248 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
249 "%u stream(s), %u client(s) connected)\n",
250 path, relay_session->hostname,
251 relay_session->name, relay_session->timer,
252 relay_session->streams, relay_session->clients);
253 }
254 }
255
256 static
257 void update_session_list(GPtrArray *session_list, char *hostname,
258 char *session_name, uint32_t streams, uint32_t clients,
259 uint32_t timer)
260 {
261 int i, found = 0;
262 struct lttng_live_relay_session *relay_session;
263
264 for (i = 0; i < session_list->len; i++) {
265 relay_session = g_ptr_array_index(session_list, i);
266 if ((strncmp(relay_session->hostname, hostname, NAME_MAX) == 0) &&
267 strncmp(relay_session->name,
268 session_name, NAME_MAX) == 0) {
269 relay_session->streams += streams;
270 if (relay_session->clients < clients)
271 relay_session->clients = clients;
272 found = 1;
273 break;
274 }
275 }
276 if (found)
277 return;
278
279 relay_session = g_new0(struct lttng_live_relay_session, 1);
280 relay_session->hostname = strndup(hostname, NAME_MAX);
281 relay_session->name = strndup(session_name, NAME_MAX);
282 relay_session->clients = clients;
283 relay_session->streams = streams;
284 relay_session->timer = timer;
285 g_ptr_array_add(session_list, relay_session);
286 }
287
288 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
289 {
290 struct lttng_viewer_cmd cmd;
291 struct lttng_viewer_list_sessions list;
292 struct lttng_viewer_session lsession;
293 int i, ret, sessions_count, print_list = 0;
294 ssize_t ret_len;
295 uint64_t session_id;
296 GPtrArray *session_list = NULL;
297
298 if (lttng_live_should_quit()) {
299 ret = -1;
300 goto end;
301 }
302
303 if (strlen(ctx->session_name) == 0) {
304 print_list = 1;
305 session_list = g_ptr_array_new();
306 }
307
308 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
309 cmd.data_size = 0;
310 cmd.cmd_version = 0;
311
312 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
313 if (ret_len < 0) {
314 perror("[error] Error sending cmd");
315 goto error;
316 }
317 assert(ret_len == sizeof(cmd));
318
319 ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
320 if (ret_len == 0) {
321 fprintf(stderr, "[error] Remote side has closed connection\n");
322 goto error;
323 }
324 if (ret_len < 0) {
325 perror("[error] Error receiving session list");
326 goto error;
327 }
328 assert(ret_len == sizeof(list));
329
330 sessions_count = be32toh(list.sessions_count);
331 for (i = 0; i < sessions_count; i++) {
332 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
333 if (ret_len == 0) {
334 fprintf(stderr, "[error] Remote side has closed connection\n");
335 goto error;
336 }
337 if (ret_len < 0) {
338 perror("[error] Error receiving session");
339 goto error;
340 }
341 assert(ret_len == sizeof(lsession));
342 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
343 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
344 session_id = be64toh(lsession.id);
345
346 if (print_list) {
347 update_session_list(session_list,
348 lsession.hostname,
349 lsession.session_name,
350 be32toh(lsession.streams),
351 be32toh(lsession.clients),
352 be32toh(lsession.live_timer));
353 } else {
354 if ((strncmp(lsession.session_name, ctx->session_name,
355 NAME_MAX) == 0) && (strncmp(lsession.hostname,
356 ctx->traced_hostname, NAME_MAX) == 0)) {
357 printf_verbose("Reading from session %" PRIu64 "\n",
358 session_id);
359 g_array_append_val(ctx->session_ids,
360 session_id);
361 }
362 }
363 }
364
365 if (print_list) {
366 print_session_list(session_list, path);
367 free_session_list(session_list);
368 }
369 ret = 0;
370 end:
371 return ret;
372
373 error:
374 fprintf(stderr, "[error] Unable to list sessions\n");
375 return -1;
376 }
377
378 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
379 uint64_t ctf_trace_id)
380 {
381 struct lttng_live_ctf_trace *trace;
382 int ret = 0;
383
384 trace = g_hash_table_lookup(stream->session->ctf_traces,
385 (gpointer) ctf_trace_id);
386 if (!trace) {
387 trace = g_new0(struct lttng_live_ctf_trace, 1);
388 trace->ctf_trace_id = ctf_trace_id;
389 trace->streams = g_ptr_array_new();
390 g_hash_table_insert(stream->session->ctf_traces,
391 (gpointer) ctf_trace_id,
392 trace);
393 }
394 if (stream->metadata_flag)
395 trace->metadata_stream = stream;
396
397 stream->ctf_trace = trace;
398 g_ptr_array_add(trace->streams, stream);
399
400 return ret;
401 }
402
403 static
404 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
405 char **metadata_buf, size_t *size)
406 {
407 int ret = 0;
408
409 stream->metadata_fp_write =
410 babeltrace_open_memstream(metadata_buf, size);
411 if (!stream->metadata_fp_write) {
412 perror("Metadata open_memstream");
413 ret = -1;
414 }
415
416 return ret;
417 }
418
419 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
420 {
421 struct lttng_viewer_cmd cmd;
422 struct lttng_viewer_attach_session_request rq;
423 struct lttng_viewer_attach_session_response rp;
424 struct lttng_viewer_stream stream;
425 int ret, i;
426 ssize_t ret_len;
427
428 if (lttng_live_should_quit()) {
429 ret = -1;
430 goto end;
431 }
432
433 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
434 cmd.data_size = sizeof(rq);
435 cmd.cmd_version = 0;
436
437 memset(&rq, 0, sizeof(rq));
438 rq.session_id = htobe64(id);
439 // TODO: add cmd line parameter to select seek beginning
440 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
441 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
442
443 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
444 if (ret_len < 0) {
445 perror("[error] Error sending cmd");
446 goto error;
447 }
448 assert(ret_len == sizeof(cmd));
449
450 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
451 if (ret_len < 0) {
452 perror("[error] Error sending attach request");
453 goto error;
454 }
455 assert(ret_len == sizeof(rq));
456
457 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
458 if (ret_len == 0) {
459 fprintf(stderr, "[error] Remote side has closed connection\n");
460 goto error;
461 }
462 if (ret_len < 0) {
463 perror("[error] Error receiving attach response");
464 goto error;
465 }
466 assert(ret_len == sizeof(rp));
467
468 switch(be32toh(rp.status)) {
469 case LTTNG_VIEWER_ATTACH_OK:
470 break;
471 case LTTNG_VIEWER_ATTACH_UNK:
472 ret = -LTTNG_VIEWER_ATTACH_UNK;
473 goto end;
474 case LTTNG_VIEWER_ATTACH_ALREADY:
475 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
476 goto error;
477 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
478 fprintf(stderr, "[error] Not a live session\n");
479 goto error;
480 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
481 fprintf(stderr, "[error] Wrong seek parameter\n");
482 goto error;
483 default:
484 fprintf(stderr, "[error] Unknown attach return code %u\n",
485 be32toh(rp.status));
486 goto error;
487 }
488 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
489 goto error;
490 }
491
492 ctx->session->stream_count += be32toh(rp.streams_count);
493 /*
494 * When the session is created but not started, we do an active wait
495 * until it starts. It allows the viewer to start processing the trace
496 * as soon as the session starts.
497 */
498 if (ctx->session->stream_count == 0) {
499 ret = 0;
500 goto end;
501 }
502 printf_verbose("Waiting for %" PRIu64 " streams:\n",
503 ctx->session->stream_count);
504 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
505 ctx->session->stream_count);
506 for (i = 0; i < be32toh(rp.streams_count); i++) {
507 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
508 if (ret_len == 0) {
509 fprintf(stderr, "[error] Remote side has closed connection\n");
510 goto error;
511 }
512 if (ret_len < 0) {
513 perror("[error] Error receiving stream");
514 goto error;
515 }
516 assert(ret_len == sizeof(stream));
517 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
518 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
519
520 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
521 be64toh(stream.id), stream.path_name,
522 stream.channel_name);
523 ctx->session->streams[i].id = be64toh(stream.id);
524 ctx->session->streams[i].session = ctx->session;
525
526 ctx->session->streams[i].first_read = 1;
527 ctx->session->streams[i].mmap_size = 0;
528
529 if (be32toh(stream.metadata_flag)) {
530 ctx->session->streams[i].metadata_flag = 1;
531 }
532 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
533 be64toh(stream.ctf_trace_id));
534 if (ret < 0) {
535 goto error;
536 }
537
538 }
539 ret = 0;
540 end:
541 return ret;
542
543 error:
544 return -1;
545 }
546
547 /*
548 * Ask the relay for new streams.
549 *
550 * Returns the number of new streams received or a negative value on error.
551 */
552 static
553 int ask_new_streams(struct lttng_live_ctx *ctx)
554 {
555 int i, ret = 0, nb_streams = 0;
556 uint64_t id;
557
558 restart:
559 for (i = 0; i < ctx->session_ids->len; i++) {
560 id = g_array_index(ctx->session_ids, uint64_t, i);
561 ret = lttng_live_get_new_streams(ctx, id);
562 printf_verbose("Asking for new streams returns %d\n", ret);
563 if (ret < 0) {
564 if (lttng_live_should_quit()) {
565 goto end;
566 }
567 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
568 printf_verbose("Session %" PRIu64 " closed\n",
569 id);
570 /*
571 * The streams have already been closed during
572 * the reading, so we only need to get rid of
573 * the trace in our internal table of sessions.
574 */
575 g_array_remove_index(ctx->session_ids, i);
576 /*
577 * We can't continue iterating on the g_array
578 * after a remove, we have to start again.
579 */
580 goto restart;
581 } else {
582 ret = -1;
583 goto end;
584 }
585 } else {
586 nb_streams += ret;
587 }
588 }
589 ret = nb_streams;
590
591 end:
592 return ret;
593 }
594
595 static
596 int append_metadata(struct lttng_live_ctx *ctx,
597 struct lttng_live_viewer_stream *viewer_stream)
598 {
599 int ret;
600 struct lttng_live_viewer_stream *metadata;
601 char *metadata_buf = NULL;
602
603 printf_verbose("get_next_index: new metadata needed\n");
604 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
605 if (ret < 0) {
606 free(metadata_buf);
607 goto error;
608 }
609
610 metadata = viewer_stream->ctf_trace->metadata_stream;
611 metadata->ctf_trace->metadata_fp =
612 babeltrace_fmemopen(metadata_buf,
613 metadata->metadata_len, "rb");
614 if (!metadata->ctf_trace->metadata_fp) {
615 perror("Metadata fmemopen");
616 free(metadata_buf);
617 ret = -1;
618 goto error;
619 }
620 ret = ctf_append_trace_metadata(
621 viewer_stream->ctf_trace->handle->td,
622 metadata->ctf_trace->metadata_fp);
623 /* We accept empty metadata packets */
624 if (ret != 0 && ret != -ENOENT) {
625 fprintf(stderr, "[error] Appending metadata\n");
626 goto error;
627 }
628 ret = 0;
629
630 error:
631 return ret;
632 }
633
634 static
635 int get_data_packet(struct lttng_live_ctx *ctx,
636 struct ctf_stream_pos *pos,
637 struct lttng_live_viewer_stream *stream, uint64_t offset,
638 uint64_t len)
639 {
640 struct lttng_viewer_cmd cmd;
641 struct lttng_viewer_get_packet rq;
642 struct lttng_viewer_trace_packet rp;
643 ssize_t ret_len;
644 int ret;
645
646 retry:
647 if (lttng_live_should_quit()) {
648 ret = -1;
649 goto end;
650 }
651 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
652 cmd.data_size = sizeof(rq);
653 cmd.cmd_version = 0;
654
655 memset(&rq, 0, sizeof(rq));
656 rq.stream_id = htobe64(stream->id);
657 rq.offset = htobe64(offset);
658 rq.len = htobe32(len);
659
660 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
661 if (ret_len < 0) {
662 perror("[error] Error sending cmd");
663 goto error;
664 }
665 assert(ret_len == sizeof(cmd));
666
667 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
668 if (ret_len < 0) {
669 perror("[error] Error sending get_data_packet request");
670 goto error;
671 }
672 assert(ret_len == sizeof(rq));
673
674 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
675 if (ret_len == 0) {
676 fprintf(stderr, "[error] Remote side has closed connection\n");
677 goto error;
678 }
679 if (ret_len < 0) {
680 perror("[error] Error receiving data response");
681 goto error;
682 }
683 if (ret_len != sizeof(rp)) {
684 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
685 ", received %" PRId64 "\n", sizeof(rp),
686 ret_len);
687 goto error;
688 }
689
690 rp.flags = be32toh(rp.flags);
691
692 switch (be32toh(rp.status)) {
693 case LTTNG_VIEWER_GET_PACKET_OK:
694 len = be32toh(rp.len);
695 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
696 "\n", len);
697 break;
698 case LTTNG_VIEWER_GET_PACKET_RETRY:
699 /* Unimplemented by relay daemon */
700 printf_verbose("get_data_packet: retry\n");
701 goto error;
702 case LTTNG_VIEWER_GET_PACKET_ERR:
703 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
704 printf_verbose("get_data_packet: new metadata needed\n");
705 ret = append_metadata(ctx, stream);
706 if (ret)
707 goto error;
708 }
709 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
710 printf_verbose("get_data_packet: new streams needed\n");
711 ret = ask_new_streams(ctx);
712 if (ret < 0)
713 goto error;
714 else if (ret > 0)
715 g_hash_table_foreach(ctx->session->ctf_traces,
716 add_traces, ctx->bt_ctx);
717 }
718 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
719 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
720 goto retry;
721 }
722 fprintf(stderr, "[error] get_data_packet: error\n");
723 goto error;
724 case LTTNG_VIEWER_GET_PACKET_EOF:
725 ret = -2;
726 goto end;
727 default:
728 printf_verbose("get_data_packet: unknown\n");
729 goto error;
730 }
731
732 if (len == 0) {
733 goto error;
734 }
735
736 if (len > stream->mmap_size) {
737 uint64_t new_size;
738
739 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
740 if (pos->base_mma) {
741 /* unmap old base */
742 ret = munmap_align(pos->base_mma);
743 if (ret) {
744 perror("[error] Unable to unmap old base");
745 goto error;
746 }
747 pos->base_mma = NULL;
748 }
749 pos->base_mma = mmap_align(new_size,
750 PROT_READ | PROT_WRITE,
751 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
752 if (pos->base_mma == MAP_FAILED) {
753 perror("[error] mmap error");
754 pos->base_mma = NULL;
755 goto error;
756 }
757
758 stream->mmap_size = new_size;
759 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
760 stream->mmap_size);
761 }
762
763 ret_len = lttng_live_recv(ctx->control_sock,
764 mmap_align_addr(pos->base_mma), len);
765 if (ret_len == 0) {
766 fprintf(stderr, "[error] Remote side has closed connection\n");
767 goto error;
768 }
769 if (ret_len < 0) {
770 perror("[error] Error receiving trace packet");
771 goto error;
772 }
773 assert(ret_len == len);
774 ret = 0;
775 end:
776 return ret;
777
778 error:
779 return -1;
780 }
781
782 static
783 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
784 struct lttng_live_viewer_stream *metadata_stream)
785 {
786 uint64_t len = 0;
787 int ret;
788 struct lttng_viewer_cmd cmd;
789 struct lttng_viewer_get_metadata rq;
790 struct lttng_viewer_metadata_packet rp;
791 char *data = NULL;
792 ssize_t ret_len;
793
794 if (lttng_live_should_quit()) {
795 ret = -1;
796 goto end;
797 }
798
799 rq.stream_id = htobe64(metadata_stream->id);
800 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
801 cmd.data_size = sizeof(rq);
802 cmd.cmd_version = 0;
803
804 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
805 if (ret_len < 0) {
806 perror("[error] Error sending cmd");
807 goto error;
808 }
809 assert(ret_len == sizeof(cmd));
810
811 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
812 if (ret_len < 0) {
813 perror("[error] Error sending get_metadata request");
814 goto error;
815 }
816 assert(ret_len == sizeof(rq));
817
818 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
819 if (ret_len == 0) {
820 fprintf(stderr, "[error] Remote side has closed connection\n");
821 goto error;
822 }
823 if (ret_len < 0) {
824 perror("[error] Error receiving metadata response");
825 goto error;
826 }
827 assert(ret_len == sizeof(rp));
828
829 switch (be32toh(rp.status)) {
830 case LTTNG_VIEWER_METADATA_OK:
831 printf_verbose("get_metadata : OK\n");
832 break;
833 case LTTNG_VIEWER_NO_NEW_METADATA:
834 printf_verbose("get_metadata : NO NEW\n");
835 ret = 0;
836 goto end;
837 case LTTNG_VIEWER_METADATA_ERR:
838 printf_verbose("get_metadata : ERR\n");
839 goto error;
840 default:
841 printf_verbose("get_metadata : UNKNOWN\n");
842 goto error;
843 }
844
845 len = be64toh(rp.len);
846 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
847 if (len <= 0) {
848 goto error;
849 }
850
851 data = zmalloc(len);
852 if (!data) {
853 perror("relay data zmalloc");
854 goto error;
855 }
856 ret_len = lttng_live_recv(ctx->control_sock, data, len);
857 if (ret_len == 0) {
858 fprintf(stderr, "[error] Remote side has closed connection\n");
859 goto error_free_data;
860 }
861 if (ret_len < 0) {
862 perror("[error] Error receiving trace packet");
863 goto error_free_data;
864 }
865 assert(ret_len == len);
866
867 do {
868 ret_len = fwrite(data, 1, len,
869 metadata_stream->metadata_fp_write);
870 } while (ret_len < 0 && errno == EINTR);
871 if (ret_len < 0) {
872 fprintf(stderr, "[error] Writing in the metadata fp\n");
873 goto error_free_data;
874 }
875 assert(ret_len == len);
876 metadata_stream->metadata_len += len;
877 free(data);
878 ret = len;
879 end:
880 return ret;
881
882 error_free_data:
883 free(data);
884 error:
885 return -1;
886 }
887
888 /*
889 * Return 0 on success, a negative value on error.
890 */
891 static
892 int get_new_metadata(struct lttng_live_ctx *ctx,
893 struct lttng_live_viewer_stream *viewer_stream,
894 char **metadata_buf)
895 {
896 int ret = 0;
897 struct lttng_live_viewer_stream *metadata_stream;
898 size_t size, len_read = 0;
899
900 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
901 if (!metadata_stream) {
902 fprintf(stderr, "[error] No metadata stream\n");
903 ret = -1;
904 goto error;
905 }
906 metadata_stream->metadata_len = 0;
907 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
908 if (ret < 0) {
909 goto error;
910 }
911
912 do {
913 /*
914 * get_one_metadata_packet returns the number of bytes
915 * received, 0 when we have received everything, a
916 * negative value on error.
917 */
918 ret = get_one_metadata_packet(ctx, metadata_stream);
919 if (ret > 0) {
920 len_read += ret;
921 }
922 if (!len_read) {
923 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
924 }
925 } while (ret > 0 || !len_read);
926
927 if (fclose(metadata_stream->metadata_fp_write))
928 perror("fclose");
929 metadata_stream->metadata_fp_write = NULL;
930
931 error:
932 return ret;
933 }
934
935 /*
936 * Get one index for a stream.
937 *
938 * Returns 0 on success or a negative value on error.
939 */
940 static
941 int get_next_index(struct lttng_live_ctx *ctx,
942 struct lttng_live_viewer_stream *viewer_stream,
943 struct packet_index *index)
944 {
945 struct lttng_viewer_cmd cmd;
946 struct lttng_viewer_get_next_index rq;
947 struct lttng_viewer_index rp;
948 int ret;
949 ssize_t ret_len;
950
951 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
952 cmd.data_size = sizeof(rq);
953 cmd.cmd_version = 0;
954
955 memset(&rq, 0, sizeof(rq));
956 rq.stream_id = htobe64(viewer_stream->id);
957
958 retry:
959 if (lttng_live_should_quit()) {
960 ret = -1;
961 goto end;
962 }
963 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
964 if (ret_len < 0) {
965 perror("[error] Error sending cmd");
966 goto error;
967 }
968 assert(ret_len == sizeof(cmd));
969
970 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
971 if (ret_len < 0) {
972 perror("[error] Error sending get_next_index request");
973 goto error;
974 }
975 assert(ret_len == sizeof(rq));
976
977 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
978 if (ret_len == 0) {
979 fprintf(stderr, "[error] Remote side has closed connection\n");
980 goto error;
981 }
982 if (ret_len < 0) {
983 perror("[error] Error receiving index response");
984 goto error;
985 }
986 assert(ret_len == sizeof(rp));
987
988 rp.flags = be32toh(rp.flags);
989
990 switch (be32toh(rp.status)) {
991 case LTTNG_VIEWER_INDEX_INACTIVE:
992 printf_verbose("get_next_index: inactive\n");
993 memset(index, 0, sizeof(struct packet_index));
994 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
995 break;
996 case LTTNG_VIEWER_INDEX_OK:
997 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
998 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
999 index->offset = be64toh(rp.offset);
1000 index->packet_size = be64toh(rp.packet_size);
1001 index->content_size = be64toh(rp.content_size);
1002 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
1003 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1004 index->events_discarded = be64toh(rp.events_discarded);
1005
1006 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1007 ret = append_metadata(ctx, viewer_stream);
1008 if (ret)
1009 goto error;
1010 }
1011 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1012 printf_verbose("get_next_index: need new streams\n");
1013 ret = ask_new_streams(ctx);
1014 if (ret < 0)
1015 goto error;
1016 else if (ret > 0)
1017 g_hash_table_foreach(ctx->session->ctf_traces,
1018 add_traces, ctx->bt_ctx);
1019 }
1020 break;
1021 case LTTNG_VIEWER_INDEX_RETRY:
1022 printf_verbose("get_next_index: retry\n");
1023 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1024 goto retry;
1025 case LTTNG_VIEWER_INDEX_HUP:
1026 printf_verbose("get_next_index: stream hung up\n");
1027 viewer_stream->id = -1ULL;
1028 index->offset = EOF;
1029 ctx->session->stream_count--;
1030 break;
1031 case LTTNG_VIEWER_INDEX_ERR:
1032 fprintf(stderr, "[error] get_next_index: error\n");
1033 goto error;
1034 default:
1035 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1036 goto error;
1037 }
1038 ret = 0;
1039 end:
1040 return ret;
1041
1042 error:
1043 return -1;
1044 }
1045
1046 static
1047 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1048 int whence)
1049 {
1050 struct ctf_stream_pos *pos;
1051 struct ctf_file_stream *file_stream;
1052 struct packet_index *prev_index = NULL, *cur_index;
1053 struct lttng_live_viewer_stream *viewer_stream;
1054 struct lttng_live_session *session;
1055 int ret;
1056
1057 retry:
1058 pos = ctf_pos(stream_pos);
1059 file_stream = container_of(pos, struct ctf_file_stream, pos);
1060 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1061 session = viewer_stream->session;
1062
1063 switch (pos->packet_index->len) {
1064 case 0:
1065 g_array_set_size(pos->packet_index, 1);
1066 cur_index = &g_array_index(pos->packet_index,
1067 struct packet_index, 0);
1068 break;
1069 case 1:
1070 g_array_set_size(pos->packet_index, 2);
1071 prev_index = &g_array_index(pos->packet_index,
1072 struct packet_index, 0);
1073 cur_index = &g_array_index(pos->packet_index,
1074 struct packet_index, 1);
1075 break;
1076 case 2:
1077 g_array_index(pos->packet_index,
1078 struct packet_index, 0) =
1079 g_array_index(pos->packet_index,
1080 struct packet_index, 1);
1081 prev_index = &g_array_index(pos->packet_index,
1082 struct packet_index, 0);
1083 cur_index = &g_array_index(pos->packet_index,
1084 struct packet_index, 1);
1085 break;
1086 default:
1087 abort();
1088 break;
1089 }
1090 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1091 ret = get_next_index(session->ctx, viewer_stream, cur_index);
1092 if (ret < 0) {
1093 pos->offset = EOF;
1094 if (!lttng_live_should_quit()) {
1095 fprintf(stderr, "[error] get_next_index failed\n");
1096 }
1097 return;
1098 }
1099
1100 pos->packet_size = cur_index->packet_size;
1101 pos->content_size = cur_index->content_size;
1102 pos->mmap_base_offset = 0;
1103 if (cur_index->offset == EOF) {
1104 pos->offset = EOF;
1105 } else {
1106 pos->offset = 0;
1107 }
1108
1109 if (cur_index->content_size == 0) {
1110 file_stream->parent.cycles_timestamp =
1111 cur_index->ts_cycles.timestamp_end;
1112 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1113 &file_stream->parent,
1114 cur_index->ts_cycles.timestamp_end);
1115 } else {
1116 /* Convert the timestamps and append to the real_index. */
1117 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1118 &file_stream->parent,
1119 cur_index->ts_cycles.timestamp_begin);
1120 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1121 &file_stream->parent,
1122 cur_index->ts_cycles.timestamp_end);
1123
1124 ctf_update_current_packet_index(&file_stream->parent,
1125 prev_index, cur_index);
1126
1127 file_stream->parent.cycles_timestamp =
1128 cur_index->ts_cycles.timestamp_begin;
1129 file_stream->parent.real_timestamp =
1130 cur_index->ts_real.timestamp_begin;
1131 }
1132
1133 if (pos->packet_size == 0 || pos->offset == EOF) {
1134 goto end;
1135 }
1136
1137 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1138 viewer_stream->id);
1139 ret = get_data_packet(session->ctx, pos, viewer_stream,
1140 cur_index->offset,
1141 cur_index->packet_size / CHAR_BIT);
1142 if (ret == -2) {
1143 goto retry;
1144 } else if (ret < 0) {
1145 pos->offset = EOF;
1146 if (!lttng_live_should_quit()) {
1147 fprintf(stderr, "[error] get_data_packet failed\n");
1148 }
1149 return;
1150 }
1151
1152 printf_verbose("Index received : packet_size : %" PRIu64
1153 ", offset %" PRIu64 ", content_size %" PRIu64
1154 ", timestamp_end : %" PRIu64 "\n",
1155 cur_index->packet_size, cur_index->offset,
1156 cur_index->content_size,
1157 cur_index->ts_cycles.timestamp_end);
1158
1159 /* update trace_packet_header and stream_packet_context */
1160 if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1161 /* Read packet header */
1162 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1163 if (ret) {
1164 pos->offset = EOF;
1165 fprintf(stderr, "[error] trace packet header read failed\n");
1166 goto end;
1167 }
1168 }
1169 if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1170 /* Read packet context */
1171 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1172 if (ret) {
1173 pos->offset = EOF;
1174 fprintf(stderr, "[error] stream packet context read failed\n");
1175 goto end;
1176 }
1177 }
1178 pos->data_offset = pos->offset;
1179
1180 end:
1181 return;
1182 }
1183
1184 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1185 {
1186 struct lttng_viewer_cmd cmd;
1187 struct lttng_viewer_create_session_response resp;
1188 int ret;
1189 ssize_t ret_len;
1190
1191 if (lttng_live_should_quit()) {
1192 ret = -1;
1193 goto end;
1194 }
1195
1196 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1197 cmd.data_size = 0;
1198 cmd.cmd_version = 0;
1199
1200 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1201 if (ret_len < 0) {
1202 perror("[error] Error sending cmd");
1203 goto error;
1204 }
1205 assert(ret_len == sizeof(cmd));
1206
1207 ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1208 if (ret_len == 0) {
1209 fprintf(stderr, "[error] Remote side has closed connection\n");
1210 goto error;
1211 }
1212 if (ret_len < 0) {
1213 perror("[error] Error receiving create session reply");
1214 goto error;
1215 }
1216 assert(ret_len == sizeof(resp));
1217
1218 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1219 fprintf(stderr, "[error] Error creating viewer session\n");
1220 goto error;
1221 }
1222 ret = 0;
1223 end:
1224 return ret;
1225
1226 error:
1227 return -1;
1228 }
1229
1230 static
1231 int del_traces(gpointer key, gpointer value, gpointer user_data)
1232 {
1233 struct bt_context *bt_ctx = user_data;
1234 struct lttng_live_ctf_trace *trace = value;
1235 int ret;
1236
1237 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1238 if (ret < 0)
1239 fprintf(stderr, "[error] removing trace from context\n");
1240
1241 /* remove the key/value pair from the HT. */
1242 return 1;
1243 }
1244
1245 static
1246 void add_traces(gpointer key, gpointer value, gpointer user_data)
1247 {
1248 int i, ret;
1249 struct bt_context *bt_ctx = user_data;
1250 struct lttng_live_ctf_trace *trace = value;
1251 struct lttng_live_viewer_stream *stream;
1252 struct bt_mmap_stream *new_mmap_stream;
1253 struct bt_mmap_stream_list mmap_list;
1254 struct lttng_live_ctx *ctx = NULL;
1255 struct bt_trace_descriptor *td;
1256 struct bt_trace_handle *handle;
1257
1258 /*
1259 * We don't know how many streams we will receive for a trace, so
1260 * once we are done receiving the traces, we add all the traces
1261 * received to the bt_context.
1262 * We can receive streams during the attach command or the
1263 * get_new_streams, so we have to make sure not to add multiple
1264 * times the same traces.
1265 * If a trace is already in the context, we just skip this function.
1266 */
1267 if (trace->in_use)
1268 return;
1269
1270 BT_INIT_LIST_HEAD(&mmap_list.head);
1271
1272 for (i = 0; i < trace->streams->len; i++) {
1273 stream = g_ptr_array_index(trace->streams, i);
1274 ctx = stream->session->ctx;
1275
1276 if (!stream->metadata_flag) {
1277 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1278 new_mmap_stream->priv = (void *) stream;
1279 new_mmap_stream->fd = -1;
1280 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1281 } else {
1282 char *metadata_buf = NULL;
1283
1284 /* Get all possible metadata before starting */
1285 ret = get_new_metadata(ctx, stream, &metadata_buf);
1286 if (ret) {
1287 free(metadata_buf);
1288 goto end_free;
1289 }
1290 if (!stream->metadata_len) {
1291 fprintf(stderr, "[error] empty metadata\n");
1292 ret = -1;
1293 free(metadata_buf);
1294 goto end_free;
1295 }
1296
1297 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1298 stream->metadata_len, "rb");
1299 if (!trace->metadata_fp) {
1300 perror("Metadata fmemopen");
1301 ret = -1;
1302 free(metadata_buf);
1303 goto end_free;
1304 }
1305 }
1306 }
1307
1308 if (!trace->metadata_fp) {
1309 fprintf(stderr, "[error] No metadata stream opened\n");
1310 goto end_free;
1311 }
1312
1313 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1314 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1315 if (ret < 0) {
1316 fprintf(stderr, "[error] Error adding trace\n");
1317 goto end_free;
1318 }
1319 trace->metadata_stream->metadata_len = 0;
1320
1321 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1322 bt_ctx->trace_handles,
1323 (gpointer) (unsigned long) ret);
1324 td = handle->td;
1325 trace->handle = handle;
1326 if (bt_ctx->current_iterator) {
1327 bt_iter_add_trace(bt_ctx->current_iterator, td);
1328 }
1329
1330 trace->trace_id = ret;
1331 trace->in_use = 1;
1332
1333 goto end;
1334
1335 end_free:
1336 bt_context_put(bt_ctx);
1337 end:
1338 return;
1339 }
1340
1341 /*
1342 * Request new streams for a session.
1343 * Returns the number of streams received or a negative value on error.
1344 */
1345 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1346 {
1347 struct lttng_viewer_cmd cmd;
1348 struct lttng_viewer_new_streams_request rq;
1349 struct lttng_viewer_new_streams_response rp;
1350 struct lttng_viewer_stream stream;
1351 int ret, i, nb_streams = 0;
1352 ssize_t ret_len;
1353 uint32_t stream_count;
1354
1355 if (lttng_live_should_quit()) {
1356 ret = -1;
1357 goto end;
1358 }
1359
1360 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1361 cmd.data_size = sizeof(rq);
1362 cmd.cmd_version = 0;
1363
1364 memset(&rq, 0, sizeof(rq));
1365 rq.session_id = htobe64(id);
1366
1367 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1368 if (ret_len < 0) {
1369 perror("[error] Error sending cmd");
1370 goto error;
1371 }
1372 assert(ret_len == sizeof(cmd));
1373
1374 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
1375 if (ret_len < 0) {
1376 perror("[error] Error sending get_new_streams request");
1377 goto error;
1378 }
1379 assert(ret_len == sizeof(rq));
1380
1381 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1382 if (ret_len == 0) {
1383 fprintf(stderr, "[error] Remote side has closed connection\n");
1384 goto error;
1385 }
1386 if (ret_len < 0) {
1387 perror("[error] Error receiving get_new_streams response");
1388 goto error;
1389 }
1390 assert(ret_len == sizeof(rp));
1391
1392 switch(be32toh(rp.status)) {
1393 case LTTNG_VIEWER_NEW_STREAMS_OK:
1394 break;
1395 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1396 ret = 0;
1397 goto end;
1398 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1399 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1400 goto end;
1401 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1402 fprintf(stderr, "[error] get_new_streams error\n");
1403 goto error;
1404 default:
1405 fprintf(stderr, "[error] Unknown return code %u\n",
1406 be32toh(rp.status));
1407 goto error;
1408 }
1409
1410 stream_count = be32toh(rp.streams_count);
1411 ctx->session->stream_count += stream_count;
1412 /*
1413 * When the session is created but not started, we do an active wait
1414 * until it starts. It allows the viewer to start processing the trace
1415 * as soon as the session starts.
1416 */
1417 if (ctx->session->stream_count == 0) {
1418 ret = 0;
1419 goto end;
1420 }
1421 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1422 ctx->session->stream_count);
1423 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1424 ctx->session->stream_count);
1425 for (i = 0; i < stream_count; i++) {
1426 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1427 if (ret_len == 0) {
1428 fprintf(stderr, "[error] Remote side has closed connection\n");
1429 goto error;
1430 }
1431 if (ret_len < 0) {
1432 perror("[error] Error receiving stream");
1433 goto error;
1434 }
1435 assert(ret_len == sizeof(stream));
1436 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1437 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1438
1439 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1440 be64toh(stream.id), stream.path_name,
1441 stream.channel_name);
1442 ctx->session->streams[i].id = be64toh(stream.id);
1443 ctx->session->streams[i].session = ctx->session;
1444
1445 ctx->session->streams[i].first_read = 1;
1446 ctx->session->streams[i].mmap_size = 0;
1447
1448 if (be32toh(stream.metadata_flag)) {
1449 ctx->session->streams[i].metadata_flag = 1;
1450 }
1451 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1452 be64toh(stream.ctf_trace_id));
1453 if (ret < 0) {
1454 goto error;
1455 }
1456 nb_streams++;
1457
1458 }
1459 ret = nb_streams;
1460 end:
1461 return ret;
1462
1463 error:
1464 return -1;
1465 }
1466
1467 int lttng_live_read(struct lttng_live_ctx *ctx)
1468 {
1469 int ret = -1;
1470 int i;
1471 struct bt_ctf_iter *iter;
1472 const struct bt_ctf_event *event;
1473 struct bt_iter_pos begin_pos;
1474 struct bt_trace_descriptor *td_write;
1475 struct bt_format *fmt_write;
1476 struct ctf_text_stream_pos *sout;
1477 uint64_t id;
1478
1479 ctx->bt_ctx = bt_context_create();
1480 if (!ctx->bt_ctx) {
1481 fprintf(stderr, "[error] bt_context_create allocation\n");
1482 goto end;
1483 }
1484
1485 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1486 if (!fmt_write) {
1487 fprintf(stderr, "[error] ctf-text error\n");
1488 goto end;
1489 }
1490
1491 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1492 if (!td_write) {
1493 fprintf(stderr, "[error] Error opening output trace\n");
1494 goto end_free;
1495 }
1496
1497 sout = container_of(td_write, struct ctf_text_stream_pos,
1498 trace_descriptor);
1499 if (!sout->parent.event_cb) {
1500 goto end_free;
1501 }
1502
1503 ret = lttng_live_create_viewer_session(ctx);
1504 if (ret < 0) {
1505 goto end_free;
1506 }
1507
1508 for (i = 0; i < ctx->session_ids->len; i++) {
1509 id = g_array_index(ctx->session_ids, uint64_t, i);
1510 printf_verbose("Attaching to session %lu\n", id);
1511 ret = lttng_live_attach_session(ctx, id);
1512 printf_verbose("Attaching session returns %d\n", ret);
1513 if (ret < 0) {
1514 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1515 fprintf(stderr, "[error] Unknown session ID\n");
1516 }
1517 goto end_free;
1518 }
1519 }
1520
1521 /*
1522 * As long as the session is active, we try to get new streams.
1523 */
1524 for (;;) {
1525 int flags;
1526
1527 if (lttng_live_should_quit()) {
1528 ret = 0;
1529 goto end_free;
1530 }
1531
1532 while (!ctx->session->stream_count) {
1533 if (lttng_live_should_quit()
1534 || ctx->session_ids->len == 0) {
1535 ret = 0;
1536 goto end_free;
1537 }
1538 ret = ask_new_streams(ctx);
1539 if (ret < 0) {
1540 goto end_free;
1541 }
1542 if (!ctx->session->stream_count) {
1543 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1544 }
1545 }
1546
1547 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1548 ctx->bt_ctx);
1549
1550 begin_pos.type = BT_SEEK_BEGIN;
1551 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1552 if (!iter) {
1553 if (lttng_live_should_quit()) {
1554 ret = 0;
1555 goto end;
1556 }
1557 fprintf(stderr, "[error] Iterator creation error\n");
1558 goto end;
1559 }
1560 for (;;) {
1561 if (lttng_live_should_quit()) {
1562 ret = 0;
1563 goto end_free;
1564 }
1565 event = bt_ctf_iter_read_event_flags(iter, &flags);
1566 if (!(flags & BT_ITER_FLAG_RETRY)) {
1567 if (!event) {
1568 /* End of trace */
1569 break;
1570 }
1571 ret = sout->parent.event_cb(&sout->parent,
1572 event->parent->stream);
1573 if (ret) {
1574 fprintf(stderr, "[error] Writing "
1575 "event failed.\n");
1576 goto end_free;
1577 }
1578 }
1579 ret = bt_iter_next(bt_ctf_get_iter(iter));
1580 if (ret < 0) {
1581 goto end_free;
1582 }
1583 }
1584 bt_ctf_iter_destroy(iter);
1585 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1586 del_traces, ctx->bt_ctx);
1587 ctx->session->stream_count = 0;
1588 }
1589
1590 end_free:
1591 bt_context_put(ctx->bt_ctx);
1592 end:
1593 if (lttng_live_should_quit()) {
1594 ret = 0;
1595 }
1596 return ret;
1597 }
BabelTrace - Trace Format Babel Tower
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