Port: Add compat for strnlen and strndup
[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 <stdlib.h>
30 #include <unistd.h>
31 #include <errno.h>
32 #include <inttypes.h>
33 #include <fcntl.h>
34 #include <sys/mman.h>
35 #include <poll.h>
36
37 #include <babeltrace/ctf/ctf-index.h>
38
39 #include <babeltrace/babeltrace.h>
40 #include <babeltrace/endian.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/compat/memstream.h>
54 #include <babeltrace/compat/send.h>
55 #include <babeltrace/compat/string.h>
56
57 #include "lttng-live.h"
58 #include "lttng-viewer-abi.h"
59
60 #define ACTIVE_POLL_DELAY 100 /* ms */
61
62 /*
63 * Memory allocation zeroed
64 */
65 #define zmalloc(x) calloc(1, x)
66
67 #ifndef max_t
68 #define max_t(type, a, b) \
69 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
70 #endif
71
72 static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
73 size_t index, int whence);
74 static int add_traces(struct lttng_live_ctx *ctx);
75 static int del_traces(gpointer key, gpointer value, gpointer user_data);
76 static int get_new_metadata(struct lttng_live_ctx *ctx,
77 struct lttng_live_viewer_stream *viewer_stream,
78 char **metadata_buf);
79
80 static
81 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
82 {
83 ssize_t ret;
84 size_t copied = 0, to_copy = len;
85
86 do {
87 ret = recv(fd, buf + copied, to_copy, 0);
88 if (ret > 0) {
89 assert(ret <= to_copy);
90 copied += ret;
91 to_copy -= ret;
92 }
93 } while ((ret > 0 && to_copy > 0)
94 || (ret < 0 && errno == EINTR));
95 if (ret > 0)
96 ret = copied;
97 /* ret = 0 means orderly shutdown, ret < 0 is error. */
98 return ret;
99 }
100
101 static
102 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
103 {
104 ssize_t ret;
105
106 do {
107 ret = bt_send_nosigpipe(fd, buf, len);
108 } while (ret < 0 && errno == EINTR);
109 return ret;
110 }
111
112 int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
113 {
114 struct hostent *host;
115 struct sockaddr_in server_addr;
116 int ret;
117
118 if (lttng_live_should_quit()) {
119 ret = -1;
120 goto end;
121 }
122
123 host = gethostbyname(ctx->relay_hostname);
124 if (!host) {
125 fprintf(stderr, "[error] Cannot lookup hostname %s\n",
126 ctx->relay_hostname);
127 goto error;
128 }
129
130 if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
131 perror("Socket");
132 goto error;
133 }
134
135 server_addr.sin_family = AF_INET;
136 server_addr.sin_port = htons(ctx->port);
137 server_addr.sin_addr = *((struct in_addr *) host->h_addr);
138 memset(&(server_addr.sin_zero), 0, 8);
139
140 if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
141 sizeof(struct sockaddr)) == -1) {
142 perror("Connect");
143 goto error;
144 }
145
146 ret = 0;
147
148 end:
149 return ret;
150
151 error:
152 fprintf(stderr, "[error] Connection failed\n");
153 return -1;
154 }
155
156 int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
157 {
158 struct lttng_viewer_cmd cmd;
159 struct lttng_viewer_connect connect;
160 int ret;
161 ssize_t ret_len;
162
163 if (lttng_live_should_quit()) {
164 ret = -1;
165 goto end;
166 }
167
168 cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
169 cmd.data_size = sizeof(connect);
170 cmd.cmd_version = 0;
171
172 connect.viewer_session_id = -1ULL; /* will be set on recv */
173 connect.major = htobe32(LTTNG_LIVE_MAJOR);
174 connect.minor = htobe32(LTTNG_LIVE_MINOR);
175 connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
176
177 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
178 if (ret_len < 0) {
179 perror("[error] Error sending cmd");
180 goto error;
181 }
182 assert(ret_len == sizeof(cmd));
183
184 ret_len = lttng_live_send(ctx->control_sock, &connect, sizeof(connect));
185 if (ret_len < 0) {
186 perror("[error] Error sending version");
187 goto error;
188 }
189 assert(ret_len == sizeof(connect));
190
191 ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect));
192 if (ret_len == 0) {
193 fprintf(stderr, "[error] Remote side has closed connection\n");
194 goto error;
195 }
196 if (ret_len < 0) {
197 perror("[error] Error receiving version");
198 goto error;
199 }
200 assert(ret_len == sizeof(connect));
201
202 printf_verbose("Received viewer session ID : %" PRIu64 "\n",
203 be64toh(connect.viewer_session_id));
204 printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
205 be32toh(connect.minor));
206
207 if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
208 fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n");
209 goto error;
210 }
211 /* Use the smallest protocol version implemented. */
212 if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
213 ctx->minor = be32toh(connect.minor);
214 } else {
215 ctx->minor = LTTNG_LIVE_MINOR;
216 }
217 ctx->major = LTTNG_LIVE_MAJOR;
218 ret = 0;
219 end:
220 return ret;
221
222 error:
223 fprintf(stderr, "[error] Unable to establish connection\n");
224 return -1;
225 }
226
227 static
228 void free_session_list(GPtrArray *session_list)
229 {
230 int i;
231 struct lttng_live_relay_session *relay_session;
232
233 for (i = 0; i < session_list->len; i++) {
234 relay_session = g_ptr_array_index(session_list, i);
235 free(relay_session->name);
236 free(relay_session->hostname);
237 }
238 g_ptr_array_free(session_list, TRUE);
239 }
240
241 static
242 void print_session_list(GPtrArray *session_list, const char *path)
243 {
244 int i;
245 struct lttng_live_relay_session *relay_session;
246
247 for (i = 0; i < session_list->len; i++) {
248 relay_session = g_ptr_array_index(session_list, i);
249 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
250 "%u stream(s), %u client(s) connected)\n",
251 path, relay_session->hostname,
252 relay_session->name, relay_session->timer,
253 relay_session->streams, relay_session->clients);
254 }
255 }
256
257 static
258 void update_session_list(GPtrArray *session_list, char *hostname,
259 char *session_name, uint32_t streams, uint32_t clients,
260 uint32_t timer)
261 {
262 int i, found = 0;
263 struct lttng_live_relay_session *relay_session;
264
265 for (i = 0; i < session_list->len; i++) {
266 relay_session = g_ptr_array_index(session_list, i);
267 if ((strncmp(relay_session->hostname, hostname, MAXNAMLEN) == 0) &&
268 strncmp(relay_session->name,
269 session_name, MAXNAMLEN) == 0) {
270 relay_session->streams += streams;
271 if (relay_session->clients < clients)
272 relay_session->clients = clients;
273 found = 1;
274 break;
275 }
276 }
277 if (found)
278 return;
279
280 relay_session = g_new0(struct lttng_live_relay_session, 1);
281 relay_session->hostname = bt_strndup(hostname, MAXNAMLEN);
282 relay_session->name = bt_strndup(session_name, MAXNAMLEN);
283 relay_session->clients = clients;
284 relay_session->streams = streams;
285 relay_session->timer = timer;
286 g_ptr_array_add(session_list, relay_session);
287 }
288
289 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
290 {
291 struct lttng_viewer_cmd cmd;
292 struct lttng_viewer_list_sessions list;
293 struct lttng_viewer_session lsession;
294 int i, ret, sessions_count, print_list = 0;
295 ssize_t ret_len;
296 uint64_t session_id;
297 GPtrArray *session_list = NULL;
298
299 if (lttng_live_should_quit()) {
300 ret = -1;
301 goto end;
302 }
303
304 if (strlen(ctx->session_name) == 0) {
305 print_list = 1;
306 session_list = g_ptr_array_new();
307 }
308
309 cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
310 cmd.data_size = 0;
311 cmd.cmd_version = 0;
312
313 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
314 if (ret_len < 0) {
315 perror("[error] Error sending cmd");
316 goto error;
317 }
318 assert(ret_len == sizeof(cmd));
319
320 ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
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 list");
327 goto error;
328 }
329 assert(ret_len == sizeof(list));
330
331 sessions_count = be32toh(list.sessions_count);
332 for (i = 0; i < sessions_count; i++) {
333 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
334 if (ret_len == 0) {
335 fprintf(stderr, "[error] Remote side has closed connection\n");
336 goto error;
337 }
338 if (ret_len < 0) {
339 perror("[error] Error receiving session");
340 goto error;
341 }
342 assert(ret_len == sizeof(lsession));
343 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
344 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
345 session_id = be64toh(lsession.id);
346
347 if (print_list) {
348 update_session_list(session_list,
349 lsession.hostname,
350 lsession.session_name,
351 be32toh(lsession.streams),
352 be32toh(lsession.clients),
353 be32toh(lsession.live_timer));
354 } else {
355 if ((strncmp(lsession.session_name, ctx->session_name,
356 MAXNAMLEN) == 0) && (strncmp(lsession.hostname,
357 ctx->traced_hostname, MAXNAMLEN) == 0)) {
358 printf_verbose("Reading from session %" PRIu64 "\n",
359 session_id);
360 g_array_append_val(ctx->session_ids,
361 session_id);
362 }
363 }
364 }
365
366 if (print_list) {
367 print_session_list(session_list, path);
368 free_session_list(session_list);
369 }
370 ret = 0;
371 end:
372 return ret;
373
374 error:
375 fprintf(stderr, "[error] Unable to list sessions\n");
376 return -1;
377 }
378
379 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
380 uint64_t ctf_trace_id)
381 {
382 struct lttng_live_ctf_trace *trace;
383 int ret = 0;
384
385 trace = g_hash_table_lookup(stream->session->ctf_traces,
386 &ctf_trace_id);
387 if (!trace) {
388 trace = g_new0(struct lttng_live_ctf_trace, 1);
389 trace->ctf_trace_id = ctf_trace_id;
390 trace->streams = g_ptr_array_new();
391 g_hash_table_insert(stream->session->ctf_traces,
392 &trace->ctf_trace_id,
393 trace);
394 }
395 if (stream->metadata_flag)
396 trace->metadata_stream = stream;
397
398 stream->ctf_trace = trace;
399 g_ptr_array_add(trace->streams, stream);
400
401 return ret;
402 }
403
404 static
405 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
406 char **metadata_buf, size_t *size)
407 {
408 int ret = 0;
409
410 stream->metadata_fp_write =
411 babeltrace_open_memstream(metadata_buf, size);
412 if (!stream->metadata_fp_write) {
413 perror("Metadata open_memstream");
414 ret = -1;
415 }
416
417 return ret;
418 }
419
420 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
421 {
422 struct lttng_viewer_cmd cmd;
423 struct lttng_viewer_attach_session_request rq;
424 struct lttng_viewer_attach_session_response rp;
425 struct lttng_viewer_stream stream;
426 int ret, i;
427 ssize_t ret_len;
428
429 if (lttng_live_should_quit()) {
430 ret = -1;
431 goto end;
432 }
433
434 cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
435 cmd.data_size = sizeof(rq);
436 cmd.cmd_version = 0;
437
438 memset(&rq, 0, sizeof(rq));
439 rq.session_id = htobe64(id);
440 // TODO: add cmd line parameter to select seek beginning
441 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
442 rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
443
444 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
445 if (ret_len < 0) {
446 perror("[error] Error sending cmd");
447 goto error;
448 }
449 assert(ret_len == sizeof(cmd));
450
451 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
452 if (ret_len < 0) {
453 perror("[error] Error sending attach request");
454 goto error;
455 }
456 assert(ret_len == sizeof(rq));
457
458 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
459 if (ret_len == 0) {
460 fprintf(stderr, "[error] Remote side has closed connection\n");
461 goto error;
462 }
463 if (ret_len < 0) {
464 perror("[error] Error receiving attach response");
465 goto error;
466 }
467 assert(ret_len == sizeof(rp));
468
469 switch(be32toh(rp.status)) {
470 case LTTNG_VIEWER_ATTACH_OK:
471 break;
472 case LTTNG_VIEWER_ATTACH_UNK:
473 ret = -LTTNG_VIEWER_ATTACH_UNK;
474 goto end;
475 case LTTNG_VIEWER_ATTACH_ALREADY:
476 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
477 goto error;
478 case LTTNG_VIEWER_ATTACH_NOT_LIVE:
479 fprintf(stderr, "[error] Not a live session\n");
480 goto error;
481 case LTTNG_VIEWER_ATTACH_SEEK_ERR:
482 fprintf(stderr, "[error] Wrong seek parameter\n");
483 goto error;
484 default:
485 fprintf(stderr, "[error] Unknown attach return code %u\n",
486 be32toh(rp.status));
487 goto error;
488 }
489 if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
490 goto error;
491 }
492
493 ctx->session->stream_count += be32toh(rp.streams_count);
494 /*
495 * When the session is created but not started, we do an active wait
496 * until it starts. It allows the viewer to start processing the trace
497 * as soon as the session starts.
498 */
499 if (ctx->session->stream_count == 0) {
500 ret = 0;
501 goto end;
502 }
503 printf_verbose("Waiting for %" PRIu64 " streams:\n",
504 ctx->session->stream_count);
505 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
506 ctx->session->stream_count);
507 for (i = 0; i < be32toh(rp.streams_count); i++) {
508 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
509 if (ret_len == 0) {
510 fprintf(stderr, "[error] Remote side has closed connection\n");
511 goto error;
512 }
513 if (ret_len < 0) {
514 perror("[error] Error receiving stream");
515 goto error;
516 }
517 assert(ret_len == sizeof(stream));
518 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
519 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
520
521 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
522 be64toh(stream.id), stream.path_name,
523 stream.channel_name);
524 ctx->session->streams[i].id = be64toh(stream.id);
525 ctx->session->streams[i].session = ctx->session;
526
527 ctx->session->streams[i].mmap_size = 0;
528 ctx->session->streams[i].ctf_stream_id = -1ULL;
529
530 if (be32toh(stream.metadata_flag)) {
531 ctx->session->streams[i].metadata_flag = 1;
532 }
533 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
534 be64toh(stream.ctf_trace_id));
535 if (ret < 0) {
536 goto error;
537 }
538
539 }
540 ret = 0;
541 end:
542 return ret;
543
544 error:
545 return -1;
546 }
547
548 /*
549 * Ask the relay for new streams.
550 *
551 * Returns the number of new streams received or a negative value on error.
552 */
553 static
554 int ask_new_streams(struct lttng_live_ctx *ctx)
555 {
556 int i, ret = 0, nb_streams = 0;
557 uint64_t id;
558
559 restart:
560 for (i = 0; i < ctx->session_ids->len; i++) {
561 id = g_array_index(ctx->session_ids, uint64_t, i);
562 ret = lttng_live_get_new_streams(ctx, id);
563 printf_verbose("Asking for new streams returns %d\n", ret);
564 if (ret < 0) {
565 if (lttng_live_should_quit()) {
566 goto end;
567 }
568 if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
569 printf_verbose("Session %" PRIu64 " closed\n",
570 id);
571 /*
572 * The streams have already been closed during
573 * the reading, so we only need to get rid of
574 * the trace in our internal table of sessions.
575 */
576 g_array_remove_index(ctx->session_ids, i);
577 /*
578 * We can't continue iterating on the g_array
579 * after a remove, we have to start again.
580 */
581 goto restart;
582 } else {
583 ret = -1;
584 goto end;
585 }
586 } else {
587 nb_streams += ret;
588 }
589 }
590 ret = nb_streams;
591
592 end:
593 return ret;
594 }
595
596 static
597 int append_metadata(struct lttng_live_ctx *ctx,
598 struct lttng_live_viewer_stream *viewer_stream)
599 {
600 int ret;
601 struct lttng_live_viewer_stream *metadata;
602 char *metadata_buf = NULL;
603
604 printf_verbose("get_next_index: new metadata needed\n");
605 ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
606 if (ret < 0) {
607 free(metadata_buf);
608 goto error;
609 }
610
611 metadata = viewer_stream->ctf_trace->metadata_stream;
612 metadata->ctf_trace->metadata_fp =
613 babeltrace_fmemopen(metadata_buf,
614 metadata->metadata_len, "rb");
615 if (!metadata->ctf_trace->metadata_fp) {
616 perror("Metadata fmemopen");
617 free(metadata_buf);
618 ret = -1;
619 goto error;
620 }
621 ret = ctf_append_trace_metadata(
622 viewer_stream->ctf_trace->handle->td,
623 metadata->ctf_trace->metadata_fp);
624 /* We accept empty metadata packets */
625 if (ret != 0 && ret != -ENOENT) {
626 fprintf(stderr, "[error] Appending metadata\n");
627 goto error;
628 }
629 ret = 0;
630
631 error:
632 return ret;
633 }
634
635 static
636 int get_data_packet(struct lttng_live_ctx *ctx,
637 struct ctf_stream_pos *pos,
638 struct lttng_live_viewer_stream *stream, uint64_t offset,
639 uint64_t len)
640 {
641 struct lttng_viewer_cmd cmd;
642 struct lttng_viewer_get_packet rq;
643 struct lttng_viewer_trace_packet rp;
644 ssize_t ret_len;
645 int ret;
646
647 retry:
648 if (lttng_live_should_quit()) {
649 ret = -1;
650 goto end;
651 }
652 cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
653 cmd.data_size = sizeof(rq);
654 cmd.cmd_version = 0;
655
656 memset(&rq, 0, sizeof(rq));
657 rq.stream_id = htobe64(stream->id);
658 rq.offset = htobe64(offset);
659 rq.len = htobe32(len);
660
661 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
662 if (ret_len < 0) {
663 perror("[error] Error sending cmd");
664 goto error;
665 }
666 assert(ret_len == sizeof(cmd));
667
668 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
669 if (ret_len < 0) {
670 perror("[error] Error sending get_data_packet request");
671 goto error;
672 }
673 assert(ret_len == sizeof(rq));
674
675 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
676 if (ret_len == 0) {
677 fprintf(stderr, "[error] Remote side has closed connection\n");
678 goto error;
679 }
680 if (ret_len < 0) {
681 perror("[error] Error receiving data response");
682 goto error;
683 }
684 if (ret_len != sizeof(rp)) {
685 fprintf(stderr, "[error] get_data_packet: expected %zu"
686 ", received %zd\n", sizeof(rp),
687 ret_len);
688 goto error;
689 }
690
691 rp.flags = be32toh(rp.flags);
692
693 switch (be32toh(rp.status)) {
694 case LTTNG_VIEWER_GET_PACKET_OK:
695 len = be32toh(rp.len);
696 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
697 "\n", len);
698 break;
699 case LTTNG_VIEWER_GET_PACKET_RETRY:
700 /* Unimplemented by relay daemon */
701 printf_verbose("get_data_packet: retry\n");
702 goto error;
703 case LTTNG_VIEWER_GET_PACKET_ERR:
704 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
705 printf_verbose("get_data_packet: new metadata needed\n");
706 ret = append_metadata(ctx, stream);
707 if (ret)
708 goto error;
709 }
710 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
711 printf_verbose("get_data_packet: new streams needed\n");
712 ret = ask_new_streams(ctx);
713 if (ret < 0) {
714 goto error;
715 } else if (ret > 0) {
716 ret = add_traces(ctx);
717 if (ret < 0) {
718 goto error;
719 }
720 }
721 }
722 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
723 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
724 goto retry;
725 }
726 fprintf(stderr, "[error] get_data_packet: error\n");
727 goto error;
728 case LTTNG_VIEWER_GET_PACKET_EOF:
729 ret = -2;
730 goto end;
731 default:
732 printf_verbose("get_data_packet: unknown\n");
733 goto error;
734 }
735
736 if (len == 0) {
737 goto error;
738 }
739
740 if (len > stream->mmap_size) {
741 uint64_t new_size;
742
743 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
744 if (pos->base_mma) {
745 /* unmap old base */
746 ret = munmap_align(pos->base_mma);
747 if (ret) {
748 perror("[error] Unable to unmap old base");
749 goto error;
750 }
751 pos->base_mma = NULL;
752 }
753 pos->base_mma = mmap_align(new_size,
754 PROT_READ | PROT_WRITE,
755 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
756 if (pos->base_mma == MAP_FAILED) {
757 perror("[error] mmap error");
758 pos->base_mma = NULL;
759 goto error;
760 }
761
762 stream->mmap_size = new_size;
763 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
764 stream->mmap_size);
765 }
766
767 ret_len = lttng_live_recv(ctx->control_sock,
768 mmap_align_addr(pos->base_mma), len);
769 if (ret_len == 0) {
770 fprintf(stderr, "[error] Remote side has closed connection\n");
771 goto error;
772 }
773 if (ret_len < 0) {
774 perror("[error] Error receiving trace packet");
775 goto error;
776 }
777 assert(ret_len == len);
778 ret = 0;
779 end:
780 return ret;
781
782 error:
783 return -1;
784 }
785
786 static
787 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
788 struct lttng_live_viewer_stream *metadata_stream)
789 {
790 uint64_t len = 0;
791 int ret;
792 struct lttng_viewer_cmd cmd;
793 struct lttng_viewer_get_metadata rq;
794 struct lttng_viewer_metadata_packet rp;
795 char *data = NULL;
796 ssize_t ret_len;
797
798 if (lttng_live_should_quit()) {
799 ret = -1;
800 goto end;
801 }
802
803 rq.stream_id = htobe64(metadata_stream->id);
804 cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
805 cmd.data_size = sizeof(rq);
806 cmd.cmd_version = 0;
807
808 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
809 if (ret_len < 0) {
810 perror("[error] Error sending cmd");
811 goto error;
812 }
813 assert(ret_len == sizeof(cmd));
814
815 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
816 if (ret_len < 0) {
817 perror("[error] Error sending get_metadata request");
818 goto error;
819 }
820 assert(ret_len == sizeof(rq));
821
822 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
823 if (ret_len == 0) {
824 fprintf(stderr, "[error] Remote side has closed connection\n");
825 goto error;
826 }
827 if (ret_len < 0) {
828 perror("[error] Error receiving metadata response");
829 goto error;
830 }
831 assert(ret_len == sizeof(rp));
832
833 switch (be32toh(rp.status)) {
834 case LTTNG_VIEWER_METADATA_OK:
835 printf_verbose("get_metadata : OK\n");
836 break;
837 case LTTNG_VIEWER_NO_NEW_METADATA:
838 printf_verbose("get_metadata : NO NEW\n");
839 ret = 0;
840 goto end;
841 case LTTNG_VIEWER_METADATA_ERR:
842 printf_verbose("get_metadata : ERR\n");
843 goto error;
844 default:
845 printf_verbose("get_metadata : UNKNOWN\n");
846 goto error;
847 }
848
849 len = be64toh(rp.len);
850 printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
851 if (len <= 0) {
852 goto error;
853 }
854
855 data = zmalloc(len);
856 if (!data) {
857 perror("relay data zmalloc");
858 goto error;
859 }
860 ret_len = lttng_live_recv(ctx->control_sock, data, len);
861 if (ret_len == 0) {
862 fprintf(stderr, "[error] Remote side has closed connection\n");
863 goto error_free_data;
864 }
865 if (ret_len < 0) {
866 perror("[error] Error receiving trace packet");
867 goto error_free_data;
868 }
869 assert(ret_len == len);
870
871 do {
872 ret_len = fwrite(data, 1, len,
873 metadata_stream->metadata_fp_write);
874 } while (ret_len < 0 && errno == EINTR);
875 if (ret_len < 0) {
876 fprintf(stderr, "[error] Writing in the metadata fp\n");
877 goto error_free_data;
878 }
879 assert(ret_len == len);
880 metadata_stream->metadata_len += len;
881 free(data);
882 ret = len;
883 end:
884 return ret;
885
886 error_free_data:
887 free(data);
888 error:
889 return -1;
890 }
891
892 /*
893 * Return 0 on success, a negative value on error.
894 */
895 static
896 int get_new_metadata(struct lttng_live_ctx *ctx,
897 struct lttng_live_viewer_stream *viewer_stream,
898 char **metadata_buf)
899 {
900 int ret = 0;
901 struct lttng_live_viewer_stream *metadata_stream;
902 size_t size, len_read = 0;
903
904 metadata_stream = viewer_stream->ctf_trace->metadata_stream;
905 if (!metadata_stream) {
906 fprintf(stderr, "[error] No metadata stream\n");
907 ret = -1;
908 goto error;
909 }
910 metadata_stream->metadata_len = 0;
911 ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
912 if (ret < 0) {
913 goto error;
914 }
915
916 do {
917 if (lttng_live_should_quit()) {
918 ret = -1;
919 goto error;
920 }
921 /*
922 * get_one_metadata_packet returns the number of bytes
923 * received, 0 when we have received everything, a
924 * negative value on error.
925 */
926 ret = get_one_metadata_packet(ctx, metadata_stream);
927 if (ret > 0) {
928 len_read += ret;
929 }
930 if (!len_read) {
931 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
932 }
933 } while (ret > 0 || !len_read);
934
935 if (fclose(metadata_stream->metadata_fp_write))
936 perror("fclose");
937 metadata_stream->metadata_fp_write = NULL;
938
939 error:
940 return ret;
941 }
942
943 /*
944 * Assign the fields from a lttng_viewer_index to a packet_index.
945 */
946 static
947 void lttng_index_to_packet_index(struct lttng_viewer_index *lindex,
948 struct packet_index *pindex)
949 {
950 assert(lindex);
951 assert(pindex);
952
953 pindex->offset = be64toh(lindex->offset);
954 pindex->packet_size = be64toh(lindex->packet_size);
955 pindex->content_size = be64toh(lindex->content_size);
956 pindex->ts_cycles.timestamp_begin = be64toh(lindex->timestamp_begin);
957 pindex->ts_cycles.timestamp_end = be64toh(lindex->timestamp_end);
958 pindex->events_discarded = be64toh(lindex->events_discarded);
959 }
960
961 /*
962 * Get one index for a stream.
963 *
964 * Returns 0 on success or a negative value on error.
965 */
966 static
967 int get_next_index(struct lttng_live_ctx *ctx,
968 struct lttng_live_viewer_stream *viewer_stream,
969 struct packet_index *index, uint64_t *stream_id)
970 {
971 struct lttng_viewer_cmd cmd;
972 struct lttng_viewer_get_next_index rq;
973 int ret;
974 ssize_t ret_len;
975 struct lttng_viewer_index *rp = &viewer_stream->current_index;
976
977 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
978 cmd.data_size = sizeof(rq);
979 cmd.cmd_version = 0;
980
981 memset(&rq, 0, sizeof(rq));
982 rq.stream_id = htobe64(viewer_stream->id);
983
984 retry:
985 if (lttng_live_should_quit()) {
986 ret = -1;
987 goto end;
988 }
989 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
990 if (ret_len < 0) {
991 perror("[error] Error sending cmd");
992 goto error;
993 }
994 assert(ret_len == sizeof(cmd));
995
996 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
997 if (ret_len < 0) {
998 perror("[error] Error sending get_next_index request");
999 goto error;
1000 }
1001 assert(ret_len == sizeof(rq));
1002
1003 ret_len = lttng_live_recv(ctx->control_sock, rp, sizeof(*rp));
1004 if (ret_len == 0) {
1005 fprintf(stderr, "[error] Remote side has closed connection\n");
1006 goto error;
1007 }
1008 if (ret_len < 0) {
1009 perror("[error] Error receiving index response");
1010 goto error;
1011 }
1012 assert(ret_len == sizeof(*rp));
1013
1014 rp->flags = be32toh(rp->flags);
1015
1016 switch (be32toh(rp->status)) {
1017 case LTTNG_VIEWER_INDEX_INACTIVE:
1018 printf_verbose("get_next_index: inactive\n");
1019 memset(index, 0, sizeof(struct packet_index));
1020 index->ts_cycles.timestamp_end = be64toh(rp->timestamp_end);
1021 *stream_id = be64toh(rp->stream_id);
1022 break;
1023 case LTTNG_VIEWER_INDEX_OK:
1024 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1025 rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
1026 lttng_index_to_packet_index(rp, index);
1027 *stream_id = be64toh(rp->stream_id);
1028 viewer_stream->data_pending = 1;
1029
1030 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1031 ret = append_metadata(ctx, viewer_stream);
1032 if (ret)
1033 goto error;
1034 }
1035 if (rp->flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1036 printf_verbose("get_next_index: need new streams\n");
1037 ret = ask_new_streams(ctx);
1038 if (ret < 0) {
1039 goto error;
1040 } else if (ret > 0) {
1041 ret = add_traces(ctx);
1042 if (ret < 0) {
1043 goto error;
1044 }
1045 }
1046 }
1047 break;
1048 case LTTNG_VIEWER_INDEX_RETRY:
1049 printf_verbose("get_next_index: retry\n");
1050 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1051 goto retry;
1052 case LTTNG_VIEWER_INDEX_HUP:
1053 printf_verbose("get_next_index: stream hung up\n");
1054 viewer_stream->id = -1ULL;
1055 index->offset = EOF;
1056 ctx->session->stream_count--;
1057 break;
1058 case LTTNG_VIEWER_INDEX_ERR:
1059 fprintf(stderr, "[error] get_next_index: error\n");
1060 goto error;
1061 default:
1062 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1063 goto error;
1064 }
1065 ret = 0;
1066 end:
1067 return ret;
1068
1069 error:
1070 return -1;
1071 }
1072
1073 static
1074 void read_packet_header(struct ctf_stream_pos *pos,
1075 struct ctf_file_stream *file_stream)
1076 {
1077 int ret;
1078
1079 /* update trace_packet_header and stream_packet_context */
1080 if (!(pos->prot & PROT_WRITE) &&
1081 file_stream->parent.trace_packet_header) {
1082 /* Read packet header */
1083 ret = generic_rw(&pos->parent,
1084 &file_stream->parent.trace_packet_header->p);
1085 if (ret) {
1086 pos->offset = EOF;
1087 fprintf(stderr, "[error] trace packet "
1088 "header read failed\n");
1089 goto end;
1090 }
1091 }
1092 if (!(pos->prot & PROT_WRITE) &&
1093 file_stream->parent.stream_packet_context) {
1094 /* Read packet context */
1095 ret = generic_rw(&pos->parent,
1096 &file_stream->parent.stream_packet_context->p);
1097 if (ret) {
1098 pos->offset = EOF;
1099 fprintf(stderr, "[error] stream packet "
1100 "context read failed\n");
1101 goto end;
1102 }
1103 }
1104 pos->data_offset = pos->offset;
1105
1106 end:
1107 return;
1108 }
1109
1110 /*
1111 * Handle the seek parameters.
1112 * Returns 0 if the packet_seek can continue, a positive value to
1113 * cleanly exit the packet_seek, a negative value on error.
1114 */
1115 static
1116 int handle_seek_position(size_t index, int whence,
1117 struct lttng_live_viewer_stream *viewer_stream,
1118 struct ctf_stream_pos *pos,
1119 struct ctf_file_stream *file_stream)
1120 {
1121 int ret;
1122
1123 switch (whence) {
1124 case SEEK_CUR:
1125 ret = 0;
1126 goto end;
1127 case SEEK_SET:
1128 /*
1129 * We only allow to seek to 0.
1130 */
1131 if (index != 0) {
1132 fprintf(stderr, "[error] Arbitrary seek in lttng-live "
1133 "trace not supported\n");
1134 pos->offset = EOF;
1135 ret = -1;
1136 goto end;
1137 }
1138
1139 ret = 0;
1140 goto end;
1141
1142 default:
1143 fprintf(stderr, "[error] Invalid seek parameter\n");
1144 assert(0);
1145 }
1146
1147 end:
1148 return ret;
1149 }
1150
1151 static
1152 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1153 int whence)
1154 {
1155 struct ctf_stream_pos *pos;
1156 struct ctf_file_stream *file_stream;
1157 struct packet_index *prev_index = NULL, *cur_index;
1158 struct lttng_live_viewer_stream *viewer_stream;
1159 struct lttng_live_session *session;
1160 uint64_t stream_id = -1ULL;
1161 int ret;
1162
1163 pos = ctf_pos(stream_pos);
1164 file_stream = container_of(pos, struct ctf_file_stream, pos);
1165 viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1166 session = viewer_stream->session;
1167
1168 ret = handle_seek_position(index, whence, viewer_stream, pos,
1169 file_stream);
1170 if (ret != 0) {
1171 return;
1172 }
1173
1174 retry:
1175 switch (pos->packet_index->len) {
1176 case 0:
1177 g_array_set_size(pos->packet_index, 1);
1178 cur_index = &g_array_index(pos->packet_index,
1179 struct packet_index, 0);
1180 break;
1181 case 1:
1182 g_array_set_size(pos->packet_index, 2);
1183 prev_index = &g_array_index(pos->packet_index,
1184 struct packet_index, 0);
1185 cur_index = &g_array_index(pos->packet_index,
1186 struct packet_index, 1);
1187 break;
1188 case 2:
1189 g_array_index(pos->packet_index,
1190 struct packet_index, 0) =
1191 g_array_index(pos->packet_index,
1192 struct packet_index, 1);
1193 prev_index = &g_array_index(pos->packet_index,
1194 struct packet_index, 0);
1195 cur_index = &g_array_index(pos->packet_index,
1196 struct packet_index, 1);
1197 break;
1198 default:
1199 abort();
1200 break;
1201 }
1202
1203 if (viewer_stream->data_pending) {
1204 lttng_index_to_packet_index(&viewer_stream->current_index, cur_index);
1205 } else {
1206 printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1207 ret = get_next_index(session->ctx, viewer_stream, cur_index, &stream_id);
1208 if (ret < 0) {
1209 pos->offset = EOF;
1210 if (!lttng_live_should_quit()) {
1211 fprintf(stderr, "[error] get_next_index failed\n");
1212 }
1213 return;
1214 }
1215 printf_verbose("Index received : packet_size : %" PRIu64
1216 ", offset %" PRIu64 ", content_size %" PRIu64
1217 ", timestamp_end : %" PRIu64 "\n",
1218 cur_index->packet_size, cur_index->offset,
1219 cur_index->content_size,
1220 cur_index->ts_cycles.timestamp_end);
1221
1222 }
1223
1224 /*
1225 * On the first time we receive an index, the stream_id needs to
1226 * be set for the stream in order to use it, we don't want any
1227 * data at this stage.
1228 */
1229 if (file_stream->parent.stream_id == -1ULL) {
1230 /*
1231 * Warning: with lttng-tools < 2.4.2, the beacon does not
1232 * contain the real stream ID, it is memset to 0, so this
1233 * might create a problem when a session has multiple
1234 * channels. We can't detect it at this stage, lttng-tools
1235 * has to be upgraded to fix this problem.
1236 */
1237 printf_verbose("Assigning stream_id %" PRIu64 "\n",
1238 stream_id);
1239 file_stream->parent.stream_id = stream_id;
1240 viewer_stream->ctf_stream_id = stream_id;
1241
1242 return;
1243 }
1244
1245 pos->packet_size = cur_index->packet_size;
1246 pos->content_size = cur_index->content_size;
1247 pos->mmap_base_offset = 0;
1248 if (cur_index->offset == EOF) {
1249 pos->offset = EOF;
1250 } else {
1251 pos->offset = 0;
1252 }
1253
1254 if (cur_index->content_size == 0) {
1255 if (file_stream->parent.stream_class) {
1256 file_stream->parent.cycles_timestamp =
1257 cur_index->ts_cycles.timestamp_end;
1258 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1259 &file_stream->parent,
1260 cur_index->ts_cycles.timestamp_end);
1261 }
1262 } else {
1263 if (file_stream->parent.stream_class) {
1264 /* Convert the timestamps and append to the real_index. */
1265 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1266 &file_stream->parent,
1267 cur_index->ts_cycles.timestamp_begin);
1268 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1269 &file_stream->parent,
1270 cur_index->ts_cycles.timestamp_end);
1271 }
1272
1273 ctf_update_current_packet_index(&file_stream->parent,
1274 prev_index, cur_index);
1275
1276 file_stream->parent.cycles_timestamp =
1277 cur_index->ts_cycles.timestamp_begin;
1278 file_stream->parent.real_timestamp =
1279 cur_index->ts_real.timestamp_begin;
1280 }
1281
1282 if (pos->packet_size == 0 || pos->offset == EOF) {
1283 goto end;
1284 }
1285
1286 printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1287 viewer_stream->id);
1288 ret = get_data_packet(session->ctx, pos, viewer_stream,
1289 cur_index->offset,
1290 cur_index->packet_size / CHAR_BIT);
1291 if (ret == -2) {
1292 goto retry;
1293 } else if (ret < 0) {
1294 pos->offset = EOF;
1295 if (!lttng_live_should_quit()) {
1296 fprintf(stderr, "[error] get_data_packet failed\n");
1297 }
1298 return;
1299 }
1300 viewer_stream->data_pending = 0;
1301
1302 read_packet_header(pos, file_stream);
1303
1304 end:
1305 return;
1306 }
1307
1308 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1309 {
1310 struct lttng_viewer_cmd cmd;
1311 struct lttng_viewer_create_session_response resp;
1312 int ret;
1313 ssize_t ret_len;
1314
1315 if (lttng_live_should_quit()) {
1316 ret = -1;
1317 goto end;
1318 }
1319
1320 cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1321 cmd.data_size = 0;
1322 cmd.cmd_version = 0;
1323
1324 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1325 if (ret_len < 0) {
1326 perror("[error] Error sending cmd");
1327 goto error;
1328 }
1329 assert(ret_len == sizeof(cmd));
1330
1331 ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1332 if (ret_len == 0) {
1333 fprintf(stderr, "[error] Remote side has closed connection\n");
1334 goto error;
1335 }
1336 if (ret_len < 0) {
1337 perror("[error] Error receiving create session reply");
1338 goto error;
1339 }
1340 assert(ret_len == sizeof(resp));
1341
1342 if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1343 fprintf(stderr, "[error] Error creating viewer session\n");
1344 goto error;
1345 }
1346 ret = 0;
1347 end:
1348 return ret;
1349
1350 error:
1351 return -1;
1352 }
1353
1354 static
1355 int del_traces(gpointer key, gpointer value, gpointer user_data)
1356 {
1357 struct bt_context *bt_ctx = user_data;
1358 struct lttng_live_ctf_trace *trace = value;
1359 int ret;
1360
1361 ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1362 if (ret < 0)
1363 fprintf(stderr, "[error] removing trace from context\n");
1364
1365 /* remove the key/value pair from the HT. */
1366 return 1;
1367 }
1368
1369 static
1370 int add_one_trace(struct lttng_live_ctx *ctx,
1371 struct lttng_live_ctf_trace *trace)
1372 {
1373 int i, ret;
1374 struct bt_context *bt_ctx = ctx->bt_ctx;
1375 struct lttng_live_viewer_stream *stream;
1376 struct bt_mmap_stream *new_mmap_stream;
1377 struct bt_mmap_stream_list mmap_list;
1378 struct bt_trace_descriptor *td;
1379 struct bt_trace_handle *handle;
1380
1381 /*
1382 * We don't know how many streams we will receive for a trace, so
1383 * once we are done receiving the traces, we add all the traces
1384 * received to the bt_context.
1385 * We can receive streams during the attach command or the
1386 * get_new_streams, so we have to make sure not to add multiple
1387 * times the same traces.
1388 * If a trace is already in the context, we just skip this function.
1389 */
1390 if (trace->in_use) {
1391 ret = 0;
1392 goto end;
1393 }
1394
1395 BT_INIT_LIST_HEAD(&mmap_list.head);
1396
1397 for (i = 0; i < trace->streams->len; i++) {
1398 stream = g_ptr_array_index(trace->streams, i);
1399
1400 if (!stream->metadata_flag) {
1401 new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1402 new_mmap_stream->priv = (void *) stream;
1403 new_mmap_stream->fd = -1;
1404 bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1405 } else {
1406 char *metadata_buf = NULL;
1407
1408 /* Get all possible metadata before starting */
1409 ret = get_new_metadata(ctx, stream, &metadata_buf);
1410 if (ret) {
1411 free(metadata_buf);
1412 goto end_free;
1413 }
1414 if (!stream->metadata_len) {
1415 fprintf(stderr, "[error] empty metadata\n");
1416 ret = -1;
1417 free(metadata_buf);
1418 goto end_free;
1419 }
1420
1421 trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1422 stream->metadata_len, "rb");
1423 if (!trace->metadata_fp) {
1424 perror("Metadata fmemopen");
1425 ret = -1;
1426 free(metadata_buf);
1427 goto end_free;
1428 }
1429 }
1430 }
1431
1432 if (!trace->metadata_fp) {
1433 fprintf(stderr, "[error] No metadata stream opened\n");
1434 ret = -1;
1435 goto end_free;
1436 }
1437
1438 ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1439 ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1440 if (ret < 0) {
1441 fprintf(stderr, "[error] Error adding trace\n");
1442 ret = -1;
1443 goto end_free;
1444 }
1445 trace->metadata_stream->metadata_len = 0;
1446
1447 handle = (struct bt_trace_handle *) g_hash_table_lookup(
1448 bt_ctx->trace_handles,
1449 (gpointer) (unsigned long) ret);
1450 td = handle->td;
1451 trace->handle = handle;
1452 if (bt_ctx->current_iterator) {
1453 bt_iter_add_trace(bt_ctx->current_iterator, td);
1454 }
1455
1456 trace->trace_id = ret;
1457 trace->in_use = 1;
1458
1459 goto end;
1460
1461 end_free:
1462 bt_context_put(bt_ctx);
1463 end:
1464 return ret;
1465 }
1466
1467 static
1468 int add_traces(struct lttng_live_ctx *ctx)
1469 {
1470 int ret;
1471 struct lttng_live_ctf_trace *trace;
1472 GHashTableIter it;
1473 gpointer key;
1474 gpointer value;
1475
1476 g_hash_table_iter_init(&it, ctx->session->ctf_traces);
1477 while (g_hash_table_iter_next(&it, &key, &value)) {
1478 trace = (struct lttng_live_ctf_trace *) value;
1479 ret = add_one_trace(ctx, trace);
1480 if (ret < 0) {
1481 goto end;
1482 }
1483 }
1484
1485 ret = 0;
1486
1487 end:
1488 return ret;
1489 }
1490
1491 /*
1492 * Request new streams for a session.
1493 * Returns the number of streams received or a negative value on error.
1494 */
1495 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1496 {
1497 struct lttng_viewer_cmd cmd;
1498 struct lttng_viewer_new_streams_request rq;
1499 struct lttng_viewer_new_streams_response rp;
1500 struct lttng_viewer_stream stream;
1501 int ret, i, nb_streams = 0;
1502 ssize_t ret_len;
1503 uint32_t stream_count;
1504
1505 if (lttng_live_should_quit()) {
1506 ret = -1;
1507 goto end;
1508 }
1509
1510 cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1511 cmd.data_size = sizeof(rq);
1512 cmd.cmd_version = 0;
1513
1514 memset(&rq, 0, sizeof(rq));
1515 rq.session_id = htobe64(id);
1516
1517 ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1518 if (ret_len < 0) {
1519 perror("[error] Error sending cmd");
1520 goto error;
1521 }
1522 assert(ret_len == sizeof(cmd));
1523
1524 ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
1525 if (ret_len < 0) {
1526 perror("[error] Error sending get_new_streams request");
1527 goto error;
1528 }
1529 assert(ret_len == sizeof(rq));
1530
1531 ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1532 if (ret_len == 0) {
1533 fprintf(stderr, "[error] Remote side has closed connection\n");
1534 goto error;
1535 }
1536 if (ret_len < 0) {
1537 perror("[error] Error receiving get_new_streams response");
1538 goto error;
1539 }
1540 assert(ret_len == sizeof(rp));
1541
1542 switch(be32toh(rp.status)) {
1543 case LTTNG_VIEWER_NEW_STREAMS_OK:
1544 break;
1545 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1546 ret = 0;
1547 goto end;
1548 case LTTNG_VIEWER_NEW_STREAMS_HUP:
1549 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1550 goto end;
1551 case LTTNG_VIEWER_NEW_STREAMS_ERR:
1552 fprintf(stderr, "[error] get_new_streams error\n");
1553 goto error;
1554 default:
1555 fprintf(stderr, "[error] Unknown return code %u\n",
1556 be32toh(rp.status));
1557 goto error;
1558 }
1559
1560 stream_count = be32toh(rp.streams_count);
1561 ctx->session->stream_count += stream_count;
1562 /*
1563 * When the session is created but not started, we do an active wait
1564 * until it starts. It allows the viewer to start processing the trace
1565 * as soon as the session starts.
1566 */
1567 if (ctx->session->stream_count == 0) {
1568 ret = 0;
1569 goto end;
1570 }
1571 printf_verbose("Waiting for %" PRIu64 " streams:\n",
1572 ctx->session->stream_count);
1573 ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1574 ctx->session->stream_count);
1575 for (i = 0; i < stream_count; i++) {
1576 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1577 if (ret_len == 0) {
1578 fprintf(stderr, "[error] Remote side has closed connection\n");
1579 goto error;
1580 }
1581 if (ret_len < 0) {
1582 perror("[error] Error receiving stream");
1583 goto error;
1584 }
1585 assert(ret_len == sizeof(stream));
1586 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1587 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1588
1589 printf_verbose(" stream %" PRIu64 " : %s/%s\n",
1590 be64toh(stream.id), stream.path_name,
1591 stream.channel_name);
1592 ctx->session->streams[i].id = be64toh(stream.id);
1593 ctx->session->streams[i].session = ctx->session;
1594
1595 ctx->session->streams[i].mmap_size = 0;
1596 ctx->session->streams[i].ctf_stream_id = -1ULL;
1597
1598 if (be32toh(stream.metadata_flag)) {
1599 ctx->session->streams[i].metadata_flag = 1;
1600 }
1601 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1602 be64toh(stream.ctf_trace_id));
1603 if (ret < 0) {
1604 goto error;
1605 }
1606 nb_streams++;
1607
1608 }
1609 ret = nb_streams;
1610 end:
1611 return ret;
1612
1613 error:
1614 return -1;
1615 }
1616
1617 int lttng_live_read(struct lttng_live_ctx *ctx)
1618 {
1619 int ret = -1;
1620 int i;
1621 struct bt_ctf_iter *iter;
1622 const struct bt_ctf_event *event;
1623 struct bt_iter_pos begin_pos;
1624 struct bt_trace_descriptor *td_write;
1625 struct bt_format *fmt_write;
1626 struct ctf_text_stream_pos *sout;
1627 uint64_t id;
1628
1629 ctx->bt_ctx = bt_context_create();
1630 if (!ctx->bt_ctx) {
1631 fprintf(stderr, "[error] bt_context_create allocation\n");
1632 goto end;
1633 }
1634
1635 fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1636 if (!fmt_write) {
1637 fprintf(stderr, "[error] ctf-text error\n");
1638 goto end;
1639 }
1640
1641 td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1642 if (!td_write) {
1643 fprintf(stderr, "[error] Error opening output trace\n");
1644 goto end_free;
1645 }
1646
1647 sout = container_of(td_write, struct ctf_text_stream_pos,
1648 trace_descriptor);
1649 if (!sout->parent.event_cb) {
1650 goto end_free;
1651 }
1652
1653 ret = lttng_live_create_viewer_session(ctx);
1654 if (ret < 0) {
1655 goto end_free;
1656 }
1657
1658 for (i = 0; i < ctx->session_ids->len; i++) {
1659 id = g_array_index(ctx->session_ids, uint64_t, i);
1660 printf_verbose("Attaching to session %" PRIu64 "\n", id);
1661 ret = lttng_live_attach_session(ctx, id);
1662 printf_verbose("Attaching session returns %d\n", ret);
1663 if (ret < 0) {
1664 if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1665 fprintf(stderr, "[error] Unknown session ID\n");
1666 }
1667 goto end_free;
1668 }
1669 }
1670
1671 /*
1672 * As long as the session is active, we try to get new streams.
1673 */
1674 for (;;) {
1675 int flags;
1676
1677 if (lttng_live_should_quit()) {
1678 ret = 0;
1679 goto end_free;
1680 }
1681
1682 while (!ctx->session->stream_count) {
1683 if (lttng_live_should_quit()
1684 || ctx->session_ids->len == 0) {
1685 ret = 0;
1686 goto end_free;
1687 }
1688 ret = ask_new_streams(ctx);
1689 if (ret < 0) {
1690 goto end_free;
1691 }
1692 if (!ctx->session->stream_count) {
1693 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1694 }
1695 }
1696
1697 ret = add_traces(ctx);
1698 if (ret < 0) {
1699 goto end_free;
1700 }
1701
1702 begin_pos.type = BT_SEEK_BEGIN;
1703 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1704 if (!iter) {
1705 if (lttng_live_should_quit()) {
1706 ret = 0;
1707 goto end;
1708 }
1709 fprintf(stderr, "[error] Iterator creation error\n");
1710 goto end;
1711 }
1712 for (;;) {
1713 if (lttng_live_should_quit()) {
1714 ret = 0;
1715 goto end_free;
1716 }
1717 event = bt_ctf_iter_read_event_flags(iter, &flags);
1718 if (!(flags & BT_ITER_FLAG_RETRY)) {
1719 if (!event) {
1720 /* End of trace */
1721 break;
1722 }
1723 ret = sout->parent.event_cb(&sout->parent,
1724 event->parent->stream);
1725 if (ret) {
1726 fprintf(stderr, "[error] Writing "
1727 "event failed.\n");
1728 goto end_free;
1729 }
1730 }
1731 ret = bt_iter_next(bt_ctf_get_iter(iter));
1732 if (ret < 0) {
1733 goto end_free;
1734 }
1735 }
1736 bt_ctf_iter_destroy(iter);
1737 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1738 del_traces, ctx->bt_ctx);
1739 ctx->session->stream_count = 0;
1740 }
1741
1742 end_free:
1743 bt_context_put(ctx->bt_ctx);
1744 end:
1745 if (lttng_live_should_quit()) {
1746 ret = 0;
1747 }
1748 return ret;
1749 }
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