2 * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
3 * Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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:
12 * The above copyright notice and this permission notice shall be included in
13 * all copies or substantial portions of the Software.
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
24 #include <sys/socket.h>
25 #include <sys/types.h>
26 #include <netinet/in.h>
37 #include <babeltrace/ctf/ctf-index.h>
39 #include <babeltrace/babeltrace.h>
40 #include <babeltrace/ctf/events.h>
41 #include <babeltrace/ctf/callbacks.h>
42 #include <babeltrace/ctf/iterator.h>
44 /* for packet_index */
45 #include <babeltrace/ctf/types.h>
47 #include <babeltrace/ctf/metadata.h>
48 #include <babeltrace/ctf-text/types.h>
49 #include <babeltrace/ctf/events-internal.h>
50 #include <formats/ctf/events-private.h>
52 #include "lttng-live.h"
53 #include "lttng-viewer-abi.h"
56 * Memory allocation zeroed
58 #define zmalloc(x) calloc(1, x)
61 #define max_t(type, a, b) \
62 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
65 static void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
,
66 size_t index
, int whence
);
67 static void add_traces(gpointer key
, gpointer value
, gpointer user_data
);
68 static int del_traces(gpointer key
, gpointer value
, gpointer user_data
);
70 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
73 struct sockaddr_in server_addr
;
76 host
= gethostbyname(ctx
->relay_hostname
);
82 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
88 server_addr
.sin_family
= AF_INET
;
89 server_addr
.sin_port
= htons(ctx
->port
);
90 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
91 bzero(&(server_addr
.sin_zero
), 8);
93 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
94 sizeof(struct sockaddr
)) == -1) {
106 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
108 struct lttng_viewer_cmd cmd
;
109 struct lttng_viewer_connect connect
;
113 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
114 cmd
.data_size
= sizeof(connect
);
117 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
118 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
119 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
120 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
123 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
124 } while (ret_len
< 0 && errno
== EINTR
);
126 perror("[error] Error sending cmd");
130 assert(ret_len
== sizeof(cmd
));
133 ret_len
= send(ctx
->control_sock
, &connect
, sizeof(connect
), 0);
134 } while (ret_len
< 0 && errno
== EINTR
);
136 perror("[error] Error sending version");
140 assert(ret_len
== sizeof(connect
));
143 ret_len
= recv(ctx
->control_sock
, &connect
, sizeof(connect
), 0);
144 } while (ret_len
< 0 && errno
== EINTR
);
146 fprintf(stderr
, "[error] Remote side has closed connection\n");
151 perror("[error] Error receiving version");
155 assert(ret_len
== sizeof(connect
));
157 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
158 be64toh(connect
.viewer_session_id
));
159 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
160 be32toh(connect
.minor
));
169 void free_session_list(GPtrArray
*session_list
)
172 struct lttng_live_relay_session
*relay_session
;
174 for (i
= 0; i
< session_list
->len
; i
++) {
175 relay_session
= g_ptr_array_index(session_list
, i
);
176 free(relay_session
->name
);
177 free(relay_session
->hostname
);
179 g_ptr_array_free(session_list
, TRUE
);
183 void print_session_list(GPtrArray
*session_list
, const char *path
)
186 struct lttng_live_relay_session
*relay_session
;
188 for (i
= 0; i
< session_list
->len
; i
++) {
189 relay_session
= g_ptr_array_index(session_list
, i
);
190 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
191 "%u stream(s), %u client(s) connected)\n",
192 path
, relay_session
->hostname
,
193 relay_session
->name
, relay_session
->timer
,
194 relay_session
->streams
, relay_session
->clients
);
199 void update_session_list(GPtrArray
*session_list
, char *hostname
,
200 char *session_name
, uint32_t streams
, uint32_t clients
,
204 struct lttng_live_relay_session
*relay_session
;
206 for (i
= 0; i
< session_list
->len
; i
++) {
207 relay_session
= g_ptr_array_index(session_list
, i
);
208 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
209 strncmp(relay_session
->name
,
210 session_name
, NAME_MAX
) == 0) {
211 relay_session
->streams
+= streams
;
212 if (relay_session
->clients
< clients
)
213 relay_session
->clients
= clients
;
221 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
222 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
223 relay_session
->name
= strndup(session_name
, NAME_MAX
);
224 relay_session
->clients
= clients
;
225 relay_session
->streams
= streams
;
226 relay_session
->timer
= timer
;
227 g_ptr_array_add(session_list
, relay_session
);
230 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
232 struct lttng_viewer_cmd cmd
;
233 struct lttng_viewer_list_sessions list
;
234 struct lttng_viewer_session lsession
;
235 int i
, ret
, sessions_count
, print_list
= 0;
238 GPtrArray
*session_list
= NULL
;
240 if (strlen(ctx
->session_name
) == 0) {
242 session_list
= g_ptr_array_new();
245 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
250 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
251 } while (ret_len
< 0 && errno
== EINTR
);
253 perror("[error] Error sending cmd");
257 assert(ret_len
== sizeof(cmd
));
260 ret_len
= recv(ctx
->control_sock
, &list
, sizeof(list
), 0);
261 } while (ret_len
< 0 && errno
== EINTR
);
263 fprintf(stderr
, "[error] Remote side has closed connection\n");
268 perror("[error] Error receiving session list");
272 assert(ret_len
== sizeof(list
));
274 sessions_count
= be32toh(list
.sessions_count
);
275 for (i
= 0; i
< sessions_count
; i
++) {
277 ret_len
= recv(ctx
->control_sock
, &lsession
, sizeof(lsession
), 0);
278 } while (ret_len
< 0 && errno
== EINTR
);
280 fprintf(stderr
, "[error] Remote side has closed connection\n");
285 perror("[error] Error receiving session");
289 assert(ret_len
== sizeof(lsession
));
290 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
291 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
292 session_id
= be64toh(lsession
.id
);
295 update_session_list(session_list
,
297 lsession
.session_name
,
298 be32toh(lsession
.streams
),
299 be32toh(lsession
.clients
),
300 be32toh(lsession
.live_timer
));
302 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
303 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
304 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
305 printf_verbose("Reading from session %" PRIu64
"\n",
307 g_array_append_val(ctx
->session_ids
,
314 print_session_list(session_list
, path
);
315 free_session_list(session_list
);
324 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
325 uint64_t ctf_trace_id
)
327 struct lttng_live_ctf_trace
*trace
;
330 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
331 (gpointer
) ctf_trace_id
);
333 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
334 trace
->ctf_trace_id
= ctf_trace_id
;
335 trace
->streams
= g_ptr_array_new();
336 g_hash_table_insert(stream
->session
->ctf_traces
,
337 (gpointer
) ctf_trace_id
,
340 if (stream
->metadata_flag
)
341 trace
->metadata_stream
= stream
;
343 stream
->ctf_trace
= trace
;
344 g_ptr_array_add(trace
->streams
, stream
);
349 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
351 struct lttng_viewer_cmd cmd
;
352 struct lttng_viewer_attach_session_request rq
;
353 struct lttng_viewer_attach_session_response rp
;
354 struct lttng_viewer_stream stream
;
358 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
359 cmd
.data_size
= sizeof(rq
);
362 memset(&rq
, 0, sizeof(rq
));
363 rq
.session_id
= htobe64(id
);
364 // TODO: add cmd line parameter to select seek beginning
365 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
366 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
369 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
370 } while (ret_len
< 0 && errno
== EINTR
);
372 perror("[error] Error sending cmd");
376 assert(ret_len
== sizeof(cmd
));
379 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
380 } while (ret_len
< 0 && errno
== EINTR
);
382 perror("[error] Error sending attach request");
386 assert(ret_len
== sizeof(rq
));
389 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
390 } while (ret_len
< 0 && errno
== EINTR
);
392 fprintf(stderr
, "[error] Remote side has closed connection\n");
397 perror("[error] Error receiving attach response");
401 assert(ret_len
== sizeof(rp
));
403 switch(be32toh(rp
.status
)) {
404 case LTTNG_VIEWER_ATTACH_OK
:
406 case LTTNG_VIEWER_ATTACH_UNK
:
407 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
409 case LTTNG_VIEWER_ATTACH_ALREADY
:
410 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
413 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
414 fprintf(stderr
, "[error] Not a live session\n");
417 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
418 fprintf(stderr
, "[error] Wrong seek parameter\n");
422 fprintf(stderr
, "[error] Unknown attach return code %u\n",
427 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
432 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
434 * When the session is created but not started, we do an active wait
435 * until it starts. It allows the viewer to start processing the trace
436 * as soon as the session starts.
438 if (ctx
->session
->stream_count
== 0) {
442 printf_verbose("Waiting for %" PRIu64
" streams:\n",
443 ctx
->session
->stream_count
);
444 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
445 ctx
->session
->stream_count
);
446 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
448 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
449 } while (ret_len
< 0 && errno
== EINTR
);
451 fprintf(stderr
, "[error] Remote side has closed connection\n");
456 perror("[error] Error receiving stream");
460 assert(ret_len
== sizeof(stream
));
461 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
462 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
464 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
465 be64toh(stream
.id
), stream
.path_name
,
466 stream
.channel_name
);
467 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
468 ctx
->session
->streams
[i
].session
= ctx
->session
;
470 ctx
->session
->streams
[i
].first_read
= 1;
471 ctx
->session
->streams
[i
].mmap_size
= 0;
473 if (be32toh(stream
.metadata_flag
)) {
476 path
= strdup(LTTNG_METADATA_PATH_TEMPLATE
);
482 if (!mkdtemp(path
)) {
488 ctx
->session
->streams
[i
].metadata_flag
= 1;
489 snprintf(ctx
->session
->streams
[i
].path
,
490 sizeof(ctx
->session
->streams
[i
].path
),
492 stream
.channel_name
);
493 ret
= open(ctx
->session
->streams
[i
].path
,
494 O_WRONLY
| O_CREAT
| O_TRUNC
,
495 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
501 ctx
->session
->streams
[i
].fd
= ret
;
504 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
505 be64toh(stream
.ctf_trace_id
));
519 int ask_new_streams(struct lttng_live_ctx
*ctx
)
525 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
526 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
527 ret
= lttng_live_get_new_streams(ctx
, id
);
528 printf_verbose("Asking for new streams returns %d\n",
531 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
532 printf_verbose("Session %" PRIu64
" closed\n",
535 * The streams have already been closed during
536 * the reading, so we only need to get rid of
537 * the trace in our internal table of sessions.
539 g_array_remove_index(ctx
->session_ids
, i
);
541 * We can't continue iterating on the g_array
542 * after a remove, we have to start again.
557 int get_data_packet(struct lttng_live_ctx
*ctx
,
558 struct ctf_stream_pos
*pos
,
559 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
562 struct lttng_viewer_cmd cmd
;
563 struct lttng_viewer_get_packet rq
;
564 struct lttng_viewer_trace_packet rp
;
568 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
569 cmd
.data_size
= sizeof(rq
);
572 memset(&rq
, 0, sizeof(rq
));
573 rq
.stream_id
= htobe64(stream
->id
);
574 /* Already in big endian. */
576 rq
.len
= htobe32(len
);
579 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
580 } while (ret_len
< 0 && errno
== EINTR
);
582 perror("[error] Error sending cmd");
586 assert(ret_len
== sizeof(cmd
));
589 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
590 } while (ret_len
< 0 && errno
== EINTR
);
592 perror("[error] Error sending get_data_packet request");
596 assert(ret_len
== sizeof(rq
));
599 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
600 } while (ret_len
< 0 && errno
== EINTR
);
602 fprintf(stderr
, "[error] Remote side has closed connection\n");
607 perror("[error] Error receiving data response");
611 if (ret_len
!= sizeof(rp
)) {
612 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
613 ", received %" PRId64
"\n", ret_len
,
619 rp
.flags
= be32toh(rp
.flags
);
621 switch (be32toh(rp
.status
)) {
622 case LTTNG_VIEWER_GET_PACKET_OK
:
623 len
= be32toh(rp
.len
);
624 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
627 case LTTNG_VIEWER_GET_PACKET_RETRY
:
628 printf_verbose("get_data_packet: retry\n");
631 case LTTNG_VIEWER_GET_PACKET_ERR
:
632 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
633 printf_verbose("get_data_packet: new metadata needed\n");
637 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
638 ret
= ask_new_streams(ctx
);
641 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
644 fprintf(stderr
, "[error] get_data_packet: error\n");
647 case LTTNG_VIEWER_GET_PACKET_EOF
:
651 printf_verbose("get_data_packet: unknown\n");
662 if (len
> stream
->mmap_size
) {
665 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
668 ret
= munmap_align(pos
->base_mma
);
670 perror("[error] Unable to unmap old base");
674 pos
->base_mma
= NULL
;
676 pos
->base_mma
= mmap_align(new_size
,
677 PROT_READ
| PROT_WRITE
,
678 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
679 if (pos
->base_mma
== MAP_FAILED
) {
680 perror("[error] mmap error");
681 pos
->base_mma
= NULL
;
686 stream
->mmap_size
= new_size
;
687 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
692 ret_len
= recv(ctx
->control_sock
,
693 mmap_align_addr(pos
->base_mma
), len
,
695 } while (ret_len
< 0 && errno
== EINTR
);
697 fprintf(stderr
, "[error] Remote side has closed connection\n");
702 perror("[error] Error receiving trace packet");
706 assert(ret_len
== len
);
714 * Return number of metadata bytes written or a negative value on error.
717 int get_new_metadata(struct lttng_live_ctx
*ctx
,
718 struct lttng_live_viewer_stream
*viewer_stream
,
719 uint64_t *metadata_len
)
723 struct lttng_viewer_cmd cmd
;
724 struct lttng_viewer_get_metadata rq
;
725 struct lttng_viewer_metadata_packet rp
;
726 struct lttng_live_viewer_stream
*metadata_stream
;
730 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
731 cmd
.data_size
= sizeof(rq
);
734 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
735 rq
.stream_id
= htobe64(metadata_stream
->id
);
738 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
739 } while (ret_len
< 0 && errno
== EINTR
);
741 perror("[error] Error sending cmd");
745 assert(ret_len
== sizeof(cmd
));
748 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
749 } while (ret_len
< 0 && errno
== EINTR
);
751 perror("[error] Error sending get_metadata request");
755 assert(ret_len
== sizeof(rq
));
758 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
759 } while (ret_len
< 0 && errno
== EINTR
);
761 fprintf(stderr
, "[error] Remote side has closed connection\n");
766 perror("[error] Error receiving metadata response");
770 assert(ret_len
== sizeof(rp
));
772 switch (be32toh(rp
.status
)) {
773 case LTTNG_VIEWER_METADATA_OK
:
774 printf_verbose("get_metadata : OK\n");
776 case LTTNG_VIEWER_NO_NEW_METADATA
:
777 printf_verbose("get_metadata : NO NEW\n");
780 case LTTNG_VIEWER_METADATA_ERR
:
781 printf_verbose("get_metadata : ERR\n");
785 printf_verbose("get_metadata : UNKNOWN\n");
790 len
= be64toh(rp
.len
);
791 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
799 perror("relay data zmalloc");
804 ret_len
= recv(ctx
->control_sock
, data
, len
, MSG_WAITALL
);
805 } while (ret_len
< 0 && errno
== EINTR
);
807 fprintf(stderr
, "[error] Remote side has closed connection\n");
813 perror("[error] Error receiving trace packet");
818 assert(ret_len
== len
);
821 ret_len
= write(metadata_stream
->fd
, data
, len
);
822 } while (ret_len
< 0 && errno
== EINTR
);
828 assert(ret_len
== len
);
840 * Get one index for a stream.
842 * Returns 0 on success or a negative value on error.
845 int get_next_index(struct lttng_live_ctx
*ctx
,
846 struct lttng_live_viewer_stream
*viewer_stream
,
847 struct packet_index
*index
)
849 struct lttng_viewer_cmd cmd
;
850 struct lttng_viewer_get_next_index rq
;
851 struct lttng_viewer_index rp
;
853 uint64_t metadata_len
;
856 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
857 cmd
.data_size
= sizeof(rq
);
860 memset(&rq
, 0, sizeof(rq
));
861 rq
.stream_id
= htobe64(viewer_stream
->id
);
865 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
866 } while (ret_len
< 0 && errno
== EINTR
);
868 perror("[error] Error sending cmd");
872 assert(ret_len
== sizeof(cmd
));
875 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
876 } while (ret_len
< 0 && errno
== EINTR
);
878 perror("[error] Error sending get_next_index request");
882 assert(ret_len
== sizeof(rq
));
885 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
886 } while (ret_len
< 0 && errno
== EINTR
);
888 fprintf(stderr
, "[error] Remote side has closed connection\n");
893 perror("[error] Error receiving index response");
897 assert(ret_len
== sizeof(rp
));
899 rp
.flags
= be32toh(rp
.flags
);
901 switch (be32toh(rp
.status
)) {
902 case LTTNG_VIEWER_INDEX_INACTIVE
:
903 printf_verbose("get_next_index: inactive\n");
904 memset(index
, 0, sizeof(struct packet_index
));
905 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
907 case LTTNG_VIEWER_INDEX_OK
:
908 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
909 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
910 index
->offset
= be64toh(rp
.offset
);
911 index
->packet_size
= be64toh(rp
.packet_size
);
912 index
->content_size
= be64toh(rp
.content_size
);
913 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
914 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
915 index
->events_discarded
= be64toh(rp
.events_discarded
);
917 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
918 printf_verbose("get_next_index: new metadata needed\n");
919 ret
= get_new_metadata(ctx
, viewer_stream
,
925 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
926 ret
= ask_new_streams(ctx
);
929 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
933 case LTTNG_VIEWER_INDEX_RETRY
:
934 printf_verbose("get_next_index: retry\n");
937 case LTTNG_VIEWER_INDEX_HUP
:
938 printf_verbose("get_next_index: stream hung up\n");
939 viewer_stream
->id
= -1ULL;
940 viewer_stream
->fd
= -1;
942 ctx
->session
->stream_count
--;
944 case LTTNG_VIEWER_INDEX_ERR
:
945 fprintf(stderr
, "[error] get_next_index: error\n");
949 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
961 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
964 struct ctf_stream_pos
*pos
;
965 struct ctf_file_stream
*file_stream
;
966 struct packet_index
*prev_index
= NULL
, *cur_index
;
967 struct lttng_live_viewer_stream
*viewer_stream
;
968 struct lttng_live_session
*session
;
972 pos
= ctf_pos(stream_pos
);
973 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
974 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
975 session
= viewer_stream
->session
;
977 switch (pos
->packet_index
->len
) {
979 g_array_set_size(pos
->packet_index
, 1);
980 cur_index
= &g_array_index(pos
->packet_index
,
981 struct packet_index
, 0);
984 g_array_set_size(pos
->packet_index
, 2);
985 prev_index
= &g_array_index(pos
->packet_index
,
986 struct packet_index
, 0);
987 cur_index
= &g_array_index(pos
->packet_index
,
988 struct packet_index
, 1);
991 g_array_index(pos
->packet_index
,
992 struct packet_index
, 0) =
993 g_array_index(pos
->packet_index
,
994 struct packet_index
, 1);
995 prev_index
= &g_array_index(pos
->packet_index
,
996 struct packet_index
, 0);
997 cur_index
= &g_array_index(pos
->packet_index
,
998 struct packet_index
, 1);
1004 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1005 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1008 fprintf(stderr
, "[error] get_next_index failed\n");
1012 pos
->packet_size
= cur_index
->packet_size
;
1013 pos
->content_size
= cur_index
->content_size
;
1014 pos
->mmap_base_offset
= 0;
1015 if (cur_index
->offset
== EOF
) {
1021 if (cur_index
->content_size
== 0) {
1022 file_stream
->parent
.cycles_timestamp
=
1023 cur_index
->ts_cycles
.timestamp_end
;
1024 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1025 &file_stream
->parent
,
1026 cur_index
->ts_cycles
.timestamp_end
);
1028 /* Convert the timestamps and append to the real_index. */
1029 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1030 &file_stream
->parent
,
1031 cur_index
->ts_cycles
.timestamp_begin
);
1032 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1033 &file_stream
->parent
,
1034 cur_index
->ts_cycles
.timestamp_end
);
1036 ctf_update_current_packet_index(&file_stream
->parent
,
1037 prev_index
, cur_index
);
1039 file_stream
->parent
.cycles_timestamp
=
1040 cur_index
->ts_cycles
.timestamp_begin
;
1041 file_stream
->parent
.real_timestamp
=
1042 cur_index
->ts_real
.timestamp_begin
;
1045 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1049 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1051 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1052 be64toh(cur_index
->offset
),
1053 cur_index
->packet_size
/ CHAR_BIT
);
1056 } else if (ret
< 0) {
1058 fprintf(stderr
, "[error] get_data_packet failed\n");
1062 printf_verbose("Index received : packet_size : %" PRIu64
1063 ", offset %" PRIu64
", content_size %" PRIu64
1064 ", timestamp_end : %" PRIu64
"\n",
1065 cur_index
->packet_size
, cur_index
->offset
,
1066 cur_index
->content_size
,
1067 cur_index
->ts_cycles
.timestamp_end
);
1069 /* update trace_packet_header and stream_packet_context */
1070 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1071 /* Read packet header */
1072 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1075 fprintf(stderr
, "[error] trace packet header read failed\n");
1079 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1080 /* Read packet context */
1081 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1084 fprintf(stderr
, "[error] stream packet context read failed\n");
1088 pos
->data_offset
= pos
->offset
;
1094 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1096 struct lttng_viewer_cmd cmd
;
1097 struct lttng_viewer_create_session_response resp
;
1101 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1103 cmd
.cmd_version
= 0;
1106 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1107 } while (ret_len
< 0 && errno
== EINTR
);
1109 perror("[error] Error sending cmd");
1113 assert(ret_len
== sizeof(cmd
));
1116 ret_len
= recv(ctx
->control_sock
, &resp
, sizeof(resp
), 0);
1117 } while (ret_len
< 0 && errno
== EINTR
);
1119 fprintf(stderr
, "[error] Remote side has closed connection\n");
1124 perror("[error] Error receiving create session reply");
1128 assert(ret_len
== sizeof(resp
));
1130 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1131 fprintf(stderr
, "[error] Error creating viewer session\n");
1142 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1144 struct bt_context
*bt_ctx
= user_data
;
1145 struct lttng_live_ctf_trace
*trace
= value
;
1148 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1150 fprintf(stderr
, "[error] removing trace from context\n");
1152 /* remove the key/value pair from the HT. */
1157 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1159 int i
, ret
, total_metadata
= 0;
1160 uint64_t metadata_len
;
1161 struct bt_context
*bt_ctx
= user_data
;
1162 struct lttng_live_ctf_trace
*trace
= value
;
1163 struct lttng_live_viewer_stream
*stream
;
1164 struct bt_mmap_stream
*new_mmap_stream
;
1165 struct bt_mmap_stream_list mmap_list
;
1166 struct lttng_live_ctx
*ctx
= NULL
;
1169 * We don't know how many streams we will receive for a trace, so
1170 * once we are done receiving the traces, we add all the traces
1171 * received to the bt_context.
1172 * We can receive streams during the attach command or the
1173 * get_new_streams, so we have to make sure not to add multiple
1174 * times the same traces.
1175 * If a trace is already in the context, we just skip this function.
1180 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1182 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1183 stream
= g_ptr_array_index(trace
->streams
, i
);
1184 ctx
= stream
->session
->ctx
;
1186 if (!stream
->metadata_flag
) {
1187 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1188 new_mmap_stream
->priv
= (void *) stream
;
1189 new_mmap_stream
->fd
= -1;
1190 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1192 /* Get all possible metadata before starting */
1194 ret
= get_new_metadata(ctx
, stream
,
1197 total_metadata
+= metadata_len
;
1199 } while (ret
== 0 || total_metadata
== 0);
1200 trace
->metadata_fp
= fopen(stream
->path
, "r");
1204 if (!trace
->metadata_fp
) {
1205 fprintf(stderr
, "[error] No metadata stream opened\n");
1209 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1210 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1212 fprintf(stderr
, "[error] Error adding trace\n");
1216 if (bt_ctx
->current_iterator
) {
1217 struct bt_trace_descriptor
*td
;
1218 struct bt_trace_handle
*handle
;
1220 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1221 bt_ctx
->trace_handles
,
1222 (gpointer
) (unsigned long) ret
);
1224 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1227 trace
->trace_id
= ret
;
1233 bt_context_put(bt_ctx
);
1238 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1240 struct lttng_viewer_cmd cmd
;
1241 struct lttng_viewer_new_streams_request rq
;
1242 struct lttng_viewer_new_streams_response rp
;
1243 struct lttng_viewer_stream stream
;
1246 uint32_t stream_count
;
1248 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1249 cmd
.data_size
= sizeof(rq
);
1250 cmd
.cmd_version
= 0;
1252 memset(&rq
, 0, sizeof(rq
));
1253 rq
.session_id
= htobe64(id
);
1256 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1257 } while (ret_len
< 0 && errno
== EINTR
);
1259 perror("[error] Error sending cmd");
1263 assert(ret_len
== sizeof(cmd
));
1266 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
1267 } while (ret_len
< 0 && errno
== EINTR
);
1269 perror("[error] Error sending get_new_streams request");
1273 assert(ret_len
== sizeof(rq
));
1276 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
1277 } while (ret_len
< 0 && errno
== EINTR
);
1279 fprintf(stderr
, "[error] Remote side has closed connection\n");
1284 perror("[error] Error receiving get_new_streams response");
1288 assert(ret_len
== sizeof(rp
));
1290 switch(be32toh(rp
.status
)) {
1291 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1293 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1296 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1297 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1299 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1300 fprintf(stderr
, "[error] get_new_streams error\n");
1304 fprintf(stderr
, "[error] Unknown return code %u\n",
1305 be32toh(rp
.status
));
1310 stream_count
= be32toh(rp
.streams_count
);
1311 ctx
->session
->stream_count
+= stream_count
;
1313 * When the session is created but not started, we do an active wait
1314 * until it starts. It allows the viewer to start processing the trace
1315 * as soon as the session starts.
1317 if (ctx
->session
->stream_count
== 0) {
1321 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1322 ctx
->session
->stream_count
);
1323 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1324 ctx
->session
->stream_count
);
1325 for (i
= 0; i
< stream_count
; i
++) {
1327 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
1328 } while (ret_len
< 0 && errno
== EINTR
);
1330 fprintf(stderr
, "[error] Remote side has closed connection\n");
1335 perror("[error] Error receiving stream");
1339 assert(ret_len
== sizeof(stream
));
1340 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1341 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1343 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1344 be64toh(stream
.id
), stream
.path_name
,
1345 stream
.channel_name
);
1346 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1347 ctx
->session
->streams
[i
].session
= ctx
->session
;
1349 ctx
->session
->streams
[i
].first_read
= 1;
1350 ctx
->session
->streams
[i
].mmap_size
= 0;
1352 if (be32toh(stream
.metadata_flag
)) {
1355 path
= strdup(LTTNG_METADATA_PATH_TEMPLATE
);
1361 if (!mkdtemp(path
)) {
1367 ctx
->session
->streams
[i
].metadata_flag
= 1;
1368 snprintf(ctx
->session
->streams
[i
].path
,
1369 sizeof(ctx
->session
->streams
[i
].path
),
1371 stream
.channel_name
);
1372 ret
= open(ctx
->session
->streams
[i
].path
,
1373 O_WRONLY
| O_CREAT
| O_TRUNC
,
1374 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
1380 ctx
->session
->streams
[i
].fd
= ret
;
1383 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1384 be64toh(stream
.ctf_trace_id
));
1397 void lttng_live_read(struct lttng_live_ctx
*ctx
)
1400 struct bt_ctf_iter
*iter
;
1401 const struct bt_ctf_event
*event
;
1402 struct bt_iter_pos begin_pos
;
1403 struct bt_trace_descriptor
*td_write
;
1404 struct bt_format
*fmt_write
;
1405 struct ctf_text_stream_pos
*sout
;
1408 ctx
->bt_ctx
= bt_context_create();
1410 fprintf(stderr
, "[error] bt_context_create allocation\n");
1414 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1416 fprintf(stderr
, "[error] ctf-text error\n");
1420 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1422 fprintf(stderr
, "[error] Error opening output trace\n");
1426 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1428 if (!sout
->parent
.event_cb
)
1431 ret
= lttng_live_create_viewer_session(ctx
);
1436 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1437 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1438 printf_verbose("Attaching to session %lu\n", id
);
1439 ret
= lttng_live_attach_session(ctx
, id
);
1440 printf_verbose("Attaching session returns %d\n", ret
);
1442 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1443 fprintf(stderr
, "[error] Unknown session ID\n");
1450 * As long as the session is active, we try to get new streams.
1455 while (!ctx
->session
->stream_count
) {
1456 if (ctx
->session_ids
->len
== 0)
1458 ret
= ask_new_streams(ctx
);
1463 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1466 begin_pos
.type
= BT_SEEK_BEGIN
;
1467 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1469 fprintf(stderr
, "[error] Iterator creation error\n");
1473 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1474 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1479 ret
= sout
->parent
.event_cb(&sout
->parent
,
1480 event
->parent
->stream
);
1482 fprintf(stderr
, "[error] Writing "
1487 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1492 bt_ctf_iter_destroy(iter
);
1493 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1494 del_traces
, ctx
->bt_ctx
);
1495 ctx
->session
->stream_count
= 0;
1499 bt_context_put(ctx
->bt_ctx
);