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 fprintf(stderr
, "[error] Error sending cmd\n");
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 fprintf(stderr
, "[error] Error sending version\n");
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] Error receiving version\n");
150 assert(ret_len
== sizeof(connect
));
152 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
153 be64toh(connect
.viewer_session_id
));
154 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
155 be32toh(connect
.minor
));
164 void free_session_list(GPtrArray
*session_list
)
167 struct lttng_live_relay_session
*relay_session
;
169 for (i
= 0; i
< session_list
->len
; i
++) {
170 relay_session
= g_ptr_array_index(session_list
, i
);
171 free(relay_session
->name
);
172 free(relay_session
->hostname
);
174 g_ptr_array_free(session_list
, TRUE
);
178 void print_session_list(GPtrArray
*session_list
, const char *path
)
181 struct lttng_live_relay_session
*relay_session
;
183 for (i
= 0; i
< session_list
->len
; i
++) {
184 relay_session
= g_ptr_array_index(session_list
, i
);
185 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
186 "%u stream(s), %u client(s) connected)\n",
187 path
, relay_session
->hostname
,
188 relay_session
->name
, relay_session
->timer
,
189 relay_session
->streams
, relay_session
->clients
);
194 void update_session_list(GPtrArray
*session_list
, char *hostname
,
195 char *session_name
, uint32_t streams
, uint32_t clients
,
199 struct lttng_live_relay_session
*relay_session
;
201 for (i
= 0; i
< session_list
->len
; i
++) {
202 relay_session
= g_ptr_array_index(session_list
, i
);
203 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
204 strncmp(relay_session
->name
,
205 session_name
, NAME_MAX
) == 0) {
206 relay_session
->streams
+= streams
;
207 if (relay_session
->clients
< clients
)
208 relay_session
->clients
= clients
;
216 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
217 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
218 relay_session
->name
= strndup(session_name
, NAME_MAX
);
219 relay_session
->clients
= clients
;
220 relay_session
->streams
= streams
;
221 relay_session
->timer
= timer
;
222 g_ptr_array_add(session_list
, relay_session
);
225 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
227 struct lttng_viewer_cmd cmd
;
228 struct lttng_viewer_list_sessions list
;
229 struct lttng_viewer_session lsession
;
230 int i
, ret
, sessions_count
, print_list
= 0;
233 GPtrArray
*session_list
= NULL
;
235 if (strlen(ctx
->session_name
) == 0) {
237 session_list
= g_ptr_array_new();
240 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
245 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
246 } while (ret_len
< 0 && errno
== EINTR
);
248 fprintf(stderr
, "[error] Error sending cmd\n");
252 assert(ret_len
== sizeof(cmd
));
255 ret_len
= recv(ctx
->control_sock
, &list
, sizeof(list
), 0);
256 } while (ret_len
< 0 && errno
== EINTR
);
258 fprintf(stderr
, "[error] Error receiving session list\n");
262 assert(ret_len
== sizeof(list
));
264 sessions_count
= be32toh(list
.sessions_count
);
265 for (i
= 0; i
< sessions_count
; i
++) {
267 ret_len
= recv(ctx
->control_sock
, &lsession
, sizeof(lsession
), 0);
268 } while (ret_len
< 0 && errno
== EINTR
);
270 fprintf(stderr
, "[error] Error receiving session\n");
274 assert(ret_len
== sizeof(lsession
));
275 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
276 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
277 session_id
= be64toh(lsession
.id
);
280 update_session_list(session_list
,
282 lsession
.session_name
,
283 be32toh(lsession
.streams
),
284 be32toh(lsession
.clients
),
285 be32toh(lsession
.live_timer
));
287 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
288 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
289 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
290 printf_verbose("Reading from session %" PRIu64
"\n",
292 g_array_append_val(ctx
->session_ids
,
299 print_session_list(session_list
, path
);
300 free_session_list(session_list
);
309 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
310 uint64_t ctf_trace_id
)
312 struct lttng_live_ctf_trace
*trace
;
315 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
316 (gpointer
) ctf_trace_id
);
318 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
319 trace
->ctf_trace_id
= ctf_trace_id
;
320 trace
->streams
= g_ptr_array_new();
321 g_hash_table_insert(stream
->session
->ctf_traces
,
322 (gpointer
) ctf_trace_id
,
325 if (stream
->metadata_flag
)
326 trace
->metadata_stream
= stream
;
328 stream
->ctf_trace
= trace
;
329 g_ptr_array_add(trace
->streams
, stream
);
334 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
336 struct lttng_viewer_cmd cmd
;
337 struct lttng_viewer_attach_session_request rq
;
338 struct lttng_viewer_attach_session_response rp
;
339 struct lttng_viewer_stream stream
;
343 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
344 cmd
.data_size
= sizeof(rq
);
347 memset(&rq
, 0, sizeof(rq
));
348 rq
.session_id
= htobe64(id
);
349 // TODO: add cmd line parameter to select seek beginning
350 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
351 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
354 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
355 } while (ret_len
< 0 && errno
== EINTR
);
357 fprintf(stderr
, "[error] Error sending cmd\n");
361 assert(ret_len
== sizeof(cmd
));
364 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
365 } while (ret_len
< 0 && errno
== EINTR
);
367 fprintf(stderr
, "[error] Error sending attach request\n");
371 assert(ret_len
== sizeof(rq
));
374 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
375 } while (ret_len
< 0 && errno
== EINTR
);
377 fprintf(stderr
, "[error] Error receiving attach response\n");
381 assert(ret_len
== sizeof(rp
));
383 switch(be32toh(rp
.status
)) {
384 case LTTNG_VIEWER_ATTACH_OK
:
386 case LTTNG_VIEWER_ATTACH_UNK
:
387 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
389 case LTTNG_VIEWER_ATTACH_ALREADY
:
390 fprintf(stderr
, "[error] Already a viewer attached\n");
393 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
394 fprintf(stderr
, "[error] Not a live session\n");
397 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
398 fprintf(stderr
, "[error] Wrong seek parameter\n");
402 fprintf(stderr
, "[error] Unknown attach return code %u\n",
407 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
412 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
414 * When the session is created but not started, we do an active wait
415 * until it starts. It allows the viewer to start processing the trace
416 * as soon as the session starts.
418 if (ctx
->session
->stream_count
== 0) {
422 printf_verbose("Waiting for %" PRIu64
" streams:\n",
423 ctx
->session
->stream_count
);
424 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
425 ctx
->session
->stream_count
);
426 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
428 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
429 } while (ret_len
< 0 && errno
== EINTR
);
431 fprintf(stderr
, "[error] Error receiving stream\n");
435 assert(ret_len
== sizeof(stream
));
436 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
437 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
439 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
440 be64toh(stream
.id
), stream
.path_name
,
441 stream
.channel_name
);
442 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
443 ctx
->session
->streams
[i
].session
= ctx
->session
;
445 ctx
->session
->streams
[i
].first_read
= 1;
446 ctx
->session
->streams
[i
].mmap_size
= 0;
448 if (be32toh(stream
.metadata_flag
)) {
451 path
= strdup(LTTNG_METADATA_PATH_TEMPLATE
);
457 if (!mkdtemp(path
)) {
463 ctx
->session
->streams
[i
].metadata_flag
= 1;
464 snprintf(ctx
->session
->streams
[i
].path
,
465 sizeof(ctx
->session
->streams
[i
].path
),
467 stream
.channel_name
);
468 ret
= open(ctx
->session
->streams
[i
].path
,
469 O_WRONLY
| O_CREAT
| O_TRUNC
,
470 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
476 ctx
->session
->streams
[i
].fd
= ret
;
479 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
480 be64toh(stream
.ctf_trace_id
));
494 int ask_new_streams(struct lttng_live_ctx
*ctx
)
500 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
501 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
502 ret
= lttng_live_get_new_streams(ctx
, id
);
503 printf_verbose("Asking for new streams returns %d\n",
506 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
507 printf_verbose("Session %" PRIu64
" closed\n",
510 * The streams have already been closed during
511 * the reading, so we only need to get rid of
512 * the trace in our internal table of sessions.
514 g_array_remove_index(ctx
->session_ids
, i
);
516 * We can't continue iterating on the g_array
517 * after a remove, we have to start again.
532 int get_data_packet(struct lttng_live_ctx
*ctx
,
533 struct ctf_stream_pos
*pos
,
534 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
537 struct lttng_viewer_cmd cmd
;
538 struct lttng_viewer_get_packet rq
;
539 struct lttng_viewer_trace_packet rp
;
543 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
544 cmd
.data_size
= sizeof(rq
);
547 memset(&rq
, 0, sizeof(rq
));
548 rq
.stream_id
= htobe64(stream
->id
);
549 /* Already in big endian. */
551 rq
.len
= htobe32(len
);
554 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
555 } while (ret_len
< 0 && errno
== EINTR
);
557 fprintf(stderr
, "[error] Error sending cmd\n");
561 assert(ret_len
== sizeof(cmd
));
564 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
565 } while (ret_len
< 0 && errno
== EINTR
);
567 fprintf(stderr
, "[error] Error sending get_data_packet request\n");
571 assert(ret_len
== sizeof(rq
));
574 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
575 } while (ret_len
< 0 && errno
== EINTR
);
577 fprintf(stderr
, "[error] Error receiving data response\n");
581 if (ret_len
!= sizeof(rp
)) {
582 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
583 ", received %" PRId64
"\n", ret_len
,
589 rp
.flags
= be32toh(rp
.flags
);
591 switch (be32toh(rp
.status
)) {
592 case LTTNG_VIEWER_GET_PACKET_OK
:
593 len
= be32toh(rp
.len
);
594 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
597 case LTTNG_VIEWER_GET_PACKET_RETRY
:
598 printf_verbose("get_data_packet: retry\n");
601 case LTTNG_VIEWER_GET_PACKET_ERR
:
602 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
603 printf_verbose("get_data_packet: new metadata needed\n");
607 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
608 ret
= ask_new_streams(ctx
);
611 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
614 fprintf(stderr
, "[error] get_data_packet: error\n");
617 case LTTNG_VIEWER_GET_PACKET_EOF
:
621 printf_verbose("get_data_packet: unknown\n");
632 if (len
> stream
->mmap_size
) {
635 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
638 ret
= munmap_align(pos
->base_mma
);
640 fprintf(stderr
, "[error] Unable to unmap old base: %s.\n",
645 pos
->base_mma
= NULL
;
647 pos
->base_mma
= mmap_align(new_size
,
648 PROT_READ
| PROT_WRITE
,
649 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
650 if (pos
->base_mma
== MAP_FAILED
) {
651 fprintf(stderr
, "[error] mmap error %s.\n",
653 pos
->base_mma
= NULL
;
658 stream
->mmap_size
= new_size
;
659 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
664 ret_len
= recv(ctx
->control_sock
,
665 mmap_align_addr(pos
->base_mma
), len
,
667 } while (ret_len
< 0 && errno
== EINTR
);
669 fprintf(stderr
, "[error] Error receiving trace packet\n");
673 assert(ret_len
== len
);
681 * Return number of metadata bytes written or a negative value on error.
684 int get_new_metadata(struct lttng_live_ctx
*ctx
,
685 struct lttng_live_viewer_stream
*viewer_stream
,
686 uint64_t *metadata_len
)
690 struct lttng_viewer_cmd cmd
;
691 struct lttng_viewer_get_metadata rq
;
692 struct lttng_viewer_metadata_packet rp
;
693 struct lttng_live_viewer_stream
*metadata_stream
;
697 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
698 cmd
.data_size
= sizeof(rq
);
701 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
702 rq
.stream_id
= htobe64(metadata_stream
->id
);
705 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
706 } while (ret_len
< 0 && errno
== EINTR
);
708 fprintf(stderr
, "[error] Error sending cmd\n");
712 assert(ret_len
== sizeof(cmd
));
715 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
716 } while (ret_len
< 0 && errno
== EINTR
);
718 fprintf(stderr
, "[error] Error sending get_metadata request\n");
722 assert(ret_len
== sizeof(rq
));
725 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
726 } while (ret_len
< 0 && errno
== EINTR
);
728 fprintf(stderr
, "[error] Error receiving metadata response\n");
732 assert(ret_len
== sizeof(rp
));
734 switch (be32toh(rp
.status
)) {
735 case LTTNG_VIEWER_METADATA_OK
:
736 printf_verbose("get_metadata : OK\n");
738 case LTTNG_VIEWER_NO_NEW_METADATA
:
739 printf_verbose("get_metadata : NO NEW\n");
742 case LTTNG_VIEWER_METADATA_ERR
:
743 printf_verbose("get_metadata : ERR\n");
747 printf_verbose("get_metadata : UNKNOWN\n");
752 len
= be64toh(rp
.len
);
753 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
761 perror("relay data zmalloc");
766 ret_len
= recv(ctx
->control_sock
, data
, len
, MSG_WAITALL
);
767 } while (ret_len
< 0 && errno
== EINTR
);
769 fprintf(stderr
, "[error] Error receiving trace packet\n");
774 assert(ret_len
== len
);
777 ret_len
= write(metadata_stream
->fd
, data
, len
);
778 } while (ret_len
< 0 && errno
== EINTR
);
784 assert(ret_len
== len
);
796 * Get one index for a stream.
798 * Returns 0 on success or a negative value on error.
801 int get_next_index(struct lttng_live_ctx
*ctx
,
802 struct lttng_live_viewer_stream
*viewer_stream
,
803 struct packet_index
*index
)
805 struct lttng_viewer_cmd cmd
;
806 struct lttng_viewer_get_next_index rq
;
807 struct lttng_viewer_index rp
;
809 uint64_t metadata_len
;
812 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
813 cmd
.data_size
= sizeof(rq
);
816 memset(&rq
, 0, sizeof(rq
));
817 rq
.stream_id
= htobe64(viewer_stream
->id
);
821 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
822 } while (ret_len
< 0 && errno
== EINTR
);
824 fprintf(stderr
, "[error] Error sending cmd\n");
828 assert(ret_len
== sizeof(cmd
));
831 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
832 } while (ret_len
< 0 && errno
== EINTR
);
834 fprintf(stderr
, "[error] Error sending get_next_index request\n");
838 assert(ret_len
== sizeof(rq
));
841 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
842 } while (ret_len
< 0 && errno
== EINTR
);
844 fprintf(stderr
, "[error] Error receiving index response\n");
848 assert(ret_len
== sizeof(rp
));
850 rp
.flags
= be32toh(rp
.flags
);
852 switch (be32toh(rp
.status
)) {
853 case LTTNG_VIEWER_INDEX_INACTIVE
:
854 printf_verbose("get_next_index: inactive\n");
855 memset(index
, 0, sizeof(struct packet_index
));
856 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
858 case LTTNG_VIEWER_INDEX_OK
:
859 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
860 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
861 index
->offset
= be64toh(rp
.offset
);
862 index
->packet_size
= be64toh(rp
.packet_size
);
863 index
->content_size
= be64toh(rp
.content_size
);
864 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
865 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
866 index
->events_discarded
= be64toh(rp
.events_discarded
);
868 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
869 printf_verbose("get_next_index: new metadata needed\n");
870 ret
= get_new_metadata(ctx
, viewer_stream
,
876 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
877 ret
= ask_new_streams(ctx
);
880 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
884 case LTTNG_VIEWER_INDEX_RETRY
:
885 printf_verbose("get_next_index: retry\n");
888 case LTTNG_VIEWER_INDEX_HUP
:
889 printf_verbose("get_next_index: stream hung up\n");
890 viewer_stream
->id
= -1ULL;
891 viewer_stream
->fd
= -1;
893 ctx
->session
->stream_count
--;
895 case LTTNG_VIEWER_INDEX_ERR
:
896 fprintf(stderr
, "[error] get_next_index: error\n");
900 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
912 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
915 struct ctf_stream_pos
*pos
;
916 struct ctf_file_stream
*file_stream
;
917 struct packet_index
*prev_index
= NULL
, *cur_index
;
918 struct lttng_live_viewer_stream
*viewer_stream
;
919 struct lttng_live_session
*session
;
923 pos
= ctf_pos(stream_pos
);
924 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
925 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
926 session
= viewer_stream
->session
;
928 switch (pos
->packet_index
->len
) {
930 g_array_set_size(pos
->packet_index
, 1);
931 cur_index
= &g_array_index(pos
->packet_index
,
932 struct packet_index
, 0);
935 g_array_set_size(pos
->packet_index
, 2);
936 prev_index
= &g_array_index(pos
->packet_index
,
937 struct packet_index
, 0);
938 cur_index
= &g_array_index(pos
->packet_index
,
939 struct packet_index
, 1);
942 g_array_index(pos
->packet_index
,
943 struct packet_index
, 0) =
944 g_array_index(pos
->packet_index
,
945 struct packet_index
, 1);
946 prev_index
= &g_array_index(pos
->packet_index
,
947 struct packet_index
, 0);
948 cur_index
= &g_array_index(pos
->packet_index
,
949 struct packet_index
, 1);
955 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
956 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
959 fprintf(stderr
, "[error] get_next_index failed\n");
963 pos
->packet_size
= cur_index
->packet_size
;
964 pos
->content_size
= cur_index
->content_size
;
965 pos
->mmap_base_offset
= 0;
966 if (cur_index
->offset
== EOF
) {
972 if (cur_index
->content_size
== 0) {
973 file_stream
->parent
.cycles_timestamp
=
974 cur_index
->ts_cycles
.timestamp_end
;
975 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
976 &file_stream
->parent
,
977 cur_index
->ts_cycles
.timestamp_end
);
979 /* Convert the timestamps and append to the real_index. */
980 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
981 &file_stream
->parent
,
982 cur_index
->ts_cycles
.timestamp_begin
);
983 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
984 &file_stream
->parent
,
985 cur_index
->ts_cycles
.timestamp_end
);
987 ctf_update_current_packet_index(&file_stream
->parent
,
988 prev_index
, cur_index
);
990 file_stream
->parent
.cycles_timestamp
=
991 cur_index
->ts_cycles
.timestamp_begin
;
992 file_stream
->parent
.real_timestamp
=
993 cur_index
->ts_real
.timestamp_begin
;
996 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1000 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1002 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1003 be64toh(cur_index
->offset
),
1004 cur_index
->packet_size
/ CHAR_BIT
);
1007 } else if (ret
< 0) {
1009 fprintf(stderr
, "[error] get_data_packet failed\n");
1013 printf_verbose("Index received : packet_size : %" PRIu64
1014 ", offset %" PRIu64
", content_size %" PRIu64
1015 ", timestamp_end : %" PRIu64
"\n",
1016 cur_index
->packet_size
, cur_index
->offset
,
1017 cur_index
->content_size
,
1018 cur_index
->ts_cycles
.timestamp_end
);
1020 /* update trace_packet_header and stream_packet_context */
1021 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1022 /* Read packet header */
1023 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1026 fprintf(stderr
, "[error] trace packet header read failed\n");
1030 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1031 /* Read packet context */
1032 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1035 fprintf(stderr
, "[error] stream packet context read failed\n");
1039 pos
->data_offset
= pos
->offset
;
1045 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1047 struct lttng_viewer_cmd cmd
;
1048 struct lttng_viewer_create_session_response resp
;
1052 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1054 cmd
.cmd_version
= 0;
1057 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1058 } while (ret_len
< 0 && errno
== EINTR
);
1060 fprintf(stderr
, "[error] Error sending cmd\n");
1064 assert(ret_len
== sizeof(cmd
));
1067 ret_len
= recv(ctx
->control_sock
, &resp
, sizeof(resp
), 0);
1068 } while (ret_len
< 0 && errno
== EINTR
);
1070 fprintf(stderr
, "[error] Error receiving create session reply\n");
1074 assert(ret_len
== sizeof(resp
));
1076 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1077 fprintf(stderr
, "[error] Error creating viewer session\n");
1088 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1090 struct bt_context
*bt_ctx
= user_data
;
1091 struct lttng_live_ctf_trace
*trace
= value
;
1094 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1096 fprintf(stderr
, "[error] removing trace from context\n");
1098 /* remove the key/value pair from the HT. */
1103 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1105 int i
, ret
, total_metadata
= 0;
1106 uint64_t metadata_len
;
1107 struct bt_context
*bt_ctx
= user_data
;
1108 struct lttng_live_ctf_trace
*trace
= value
;
1109 struct lttng_live_viewer_stream
*stream
;
1110 struct bt_mmap_stream
*new_mmap_stream
;
1111 struct bt_mmap_stream_list mmap_list
;
1112 struct lttng_live_ctx
*ctx
= NULL
;
1115 * We don't know how many streams we will receive for a trace, so
1116 * once we are done receiving the traces, we add all the traces
1117 * received to the bt_context.
1118 * We can receive streams during the attach command or the
1119 * get_new_streams, so we have to make sure not to add multiple
1120 * times the same traces.
1121 * If a trace is already in the context, we just skip this function.
1126 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1128 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1129 stream
= g_ptr_array_index(trace
->streams
, i
);
1130 ctx
= stream
->session
->ctx
;
1132 if (!stream
->metadata_flag
) {
1133 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1134 new_mmap_stream
->priv
= (void *) stream
;
1135 new_mmap_stream
->fd
= -1;
1136 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1138 /* Get all possible metadata before starting */
1140 ret
= get_new_metadata(ctx
, stream
,
1143 total_metadata
+= metadata_len
;
1145 } while (ret
== 0 || total_metadata
== 0);
1146 trace
->metadata_fp
= fopen(stream
->path
, "r");
1150 if (!trace
->metadata_fp
) {
1151 fprintf(stderr
, "[error] No metadata stream opened\n");
1155 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1156 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1158 fprintf(stderr
, "[error] Error adding trace\n");
1162 if (bt_ctx
->current_iterator
) {
1163 struct bt_trace_descriptor
*td
;
1164 struct bt_trace_handle
*handle
;
1166 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1167 bt_ctx
->trace_handles
,
1168 (gpointer
) (unsigned long) ret
);
1170 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1173 trace
->trace_id
= ret
;
1179 bt_context_put(bt_ctx
);
1184 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1186 struct lttng_viewer_cmd cmd
;
1187 struct lttng_viewer_new_streams_request rq
;
1188 struct lttng_viewer_new_streams_response rp
;
1189 struct lttng_viewer_stream stream
;
1192 uint32_t stream_count
;
1194 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1195 cmd
.data_size
= sizeof(rq
);
1196 cmd
.cmd_version
= 0;
1198 memset(&rq
, 0, sizeof(rq
));
1199 rq
.session_id
= htobe64(id
);
1202 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1203 } while (ret_len
< 0 && errno
== EINTR
);
1205 fprintf(stderr
, "[error] Error sending cmd\n");
1209 assert(ret_len
== sizeof(cmd
));
1212 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
1213 } while (ret_len
< 0 && errno
== EINTR
);
1215 fprintf(stderr
, "[error] Error sending get_new_streams request\n");
1219 assert(ret_len
== sizeof(rq
));
1222 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
1223 } while (ret_len
< 0 && errno
== EINTR
);
1225 fprintf(stderr
, "[error] Error receiving get_new_streams response\n");
1229 assert(ret_len
== sizeof(rp
));
1231 switch(be32toh(rp
.status
)) {
1232 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1234 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1237 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1238 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1240 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1241 fprintf(stderr
, "[error] get_new_streams error\n");
1245 fprintf(stderr
, "[error] Unknown return code %u\n",
1246 be32toh(rp
.status
));
1251 stream_count
= be32toh(rp
.streams_count
);
1252 ctx
->session
->stream_count
+= stream_count
;
1254 * When the session is created but not started, we do an active wait
1255 * until it starts. It allows the viewer to start processing the trace
1256 * as soon as the session starts.
1258 if (ctx
->session
->stream_count
== 0) {
1262 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1263 ctx
->session
->stream_count
);
1264 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1265 ctx
->session
->stream_count
);
1266 for (i
= 0; i
< stream_count
; i
++) {
1268 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
1269 } while (ret_len
< 0 && errno
== EINTR
);
1271 fprintf(stderr
, "[error] Error receiving stream\n");
1275 assert(ret_len
== sizeof(stream
));
1276 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1277 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1279 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1280 be64toh(stream
.id
), stream
.path_name
,
1281 stream
.channel_name
);
1282 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1283 ctx
->session
->streams
[i
].session
= ctx
->session
;
1285 ctx
->session
->streams
[i
].first_read
= 1;
1286 ctx
->session
->streams
[i
].mmap_size
= 0;
1288 if (be32toh(stream
.metadata_flag
)) {
1291 path
= strdup(LTTNG_METADATA_PATH_TEMPLATE
);
1297 if (!mkdtemp(path
)) {
1303 ctx
->session
->streams
[i
].metadata_flag
= 1;
1304 snprintf(ctx
->session
->streams
[i
].path
,
1305 sizeof(ctx
->session
->streams
[i
].path
),
1307 stream
.channel_name
);
1308 ret
= open(ctx
->session
->streams
[i
].path
,
1309 O_WRONLY
| O_CREAT
| O_TRUNC
,
1310 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
);
1316 ctx
->session
->streams
[i
].fd
= ret
;
1319 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1320 be64toh(stream
.ctf_trace_id
));
1333 void lttng_live_read(struct lttng_live_ctx
*ctx
)
1336 struct bt_ctf_iter
*iter
;
1337 const struct bt_ctf_event
*event
;
1338 struct bt_iter_pos begin_pos
;
1339 struct bt_trace_descriptor
*td_write
;
1340 struct bt_format
*fmt_write
;
1341 struct ctf_text_stream_pos
*sout
;
1344 ctx
->bt_ctx
= bt_context_create();
1346 fprintf(stderr
, "[error] bt_context_create allocation\n");
1350 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1352 fprintf(stderr
, "[error] ctf-text error\n");
1356 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1358 fprintf(stderr
, "[error] Error opening output trace\n");
1362 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1364 if (!sout
->parent
.event_cb
)
1367 ret
= lttng_live_create_viewer_session(ctx
);
1372 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1373 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1374 printf_verbose("Attaching to session %lu\n", id
);
1375 ret
= lttng_live_attach_session(ctx
, id
);
1376 printf_verbose("Attaching session returns %d\n", ret
);
1378 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1379 fprintf(stderr
, "[error] Unknown session ID\n");
1386 * As long as the session is active, we try to get new streams.
1391 while (!ctx
->session
->stream_count
) {
1392 if (ctx
->session_ids
->len
== 0)
1394 ret
= ask_new_streams(ctx
);
1399 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1402 begin_pos
.type
= BT_SEEK_BEGIN
;
1403 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1405 fprintf(stderr
, "[error] Iterator creation error\n");
1409 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1410 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1415 ret
= sout
->parent
.event_cb(&sout
->parent
,
1416 event
->parent
->stream
);
1418 fprintf(stderr
, "[error] Writing "
1423 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1428 bt_ctf_iter_destroy(iter
);
1429 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1430 del_traces
, ctx
->bt_ctx
);
1431 ctx
->session
->stream_count
= 0;
1435 bt_context_put(ctx
->bt_ctx
);