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 <babeltrace/compat/memstream.h>
54 #include "lttng-live.h"
55 #include "lttng-viewer-abi.h"
58 * Memory allocation zeroed
60 #define zmalloc(x) calloc(1, x)
63 #define max_t(type, a, b) \
64 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
67 static void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
,
68 size_t index
, int whence
);
69 static void add_traces(gpointer key
, gpointer value
, gpointer user_data
);
70 static int del_traces(gpointer key
, gpointer value
, gpointer user_data
);
71 static int get_new_metadata(struct lttng_live_ctx
*ctx
,
72 struct lttng_live_viewer_stream
*viewer_stream
,
76 ssize_t
lttng_live_recv(int fd
, void *buf
, size_t len
)
79 size_t copied
= 0, to_copy
= len
;
82 ret
= recv(fd
, buf
+ copied
, to_copy
, 0);
84 assert(ret
<= to_copy
);
88 } while ((ret
> 0 && to_copy
> 0)
89 || (ret
< 0 && errno
== EINTR
));
92 /* ret = 0 means orderly shutdown, ret < 0 is error. */
97 ssize_t
lttng_live_send(int fd
, const void *buf
, size_t len
)
102 ret
= send(fd
, buf
, len
, MSG_NOSIGNAL
);
103 } while (ret
< 0 && errno
== EINTR
);
107 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
109 struct hostent
*host
;
110 struct sockaddr_in server_addr
;
113 host
= gethostbyname(ctx
->relay_hostname
);
119 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
125 server_addr
.sin_family
= AF_INET
;
126 server_addr
.sin_port
= htons(ctx
->port
);
127 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
128 bzero(&(server_addr
.sin_zero
), 8);
130 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
131 sizeof(struct sockaddr
)) == -1) {
143 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
145 struct lttng_viewer_cmd cmd
;
146 struct lttng_viewer_connect connect
;
150 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
151 cmd
.data_size
= sizeof(connect
);
154 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
155 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
156 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
157 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
159 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
161 perror("[error] Error sending cmd");
165 assert(ret_len
== sizeof(cmd
));
167 ret_len
= lttng_live_send(ctx
->control_sock
, &connect
, sizeof(connect
));
169 perror("[error] Error sending version");
173 assert(ret_len
== sizeof(connect
));
175 ret_len
= lttng_live_recv(ctx
->control_sock
, &connect
, sizeof(connect
));
177 fprintf(stderr
, "[error] Remote side has closed connection\n");
182 perror("[error] Error receiving version");
186 assert(ret_len
== sizeof(connect
));
188 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
189 be64toh(connect
.viewer_session_id
));
190 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
191 be32toh(connect
.minor
));
200 void free_session_list(GPtrArray
*session_list
)
203 struct lttng_live_relay_session
*relay_session
;
205 for (i
= 0; i
< session_list
->len
; i
++) {
206 relay_session
= g_ptr_array_index(session_list
, i
);
207 free(relay_session
->name
);
208 free(relay_session
->hostname
);
210 g_ptr_array_free(session_list
, TRUE
);
214 void print_session_list(GPtrArray
*session_list
, const char *path
)
217 struct lttng_live_relay_session
*relay_session
;
219 for (i
= 0; i
< session_list
->len
; i
++) {
220 relay_session
= g_ptr_array_index(session_list
, i
);
221 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
222 "%u stream(s), %u client(s) connected)\n",
223 path
, relay_session
->hostname
,
224 relay_session
->name
, relay_session
->timer
,
225 relay_session
->streams
, relay_session
->clients
);
230 void update_session_list(GPtrArray
*session_list
, char *hostname
,
231 char *session_name
, uint32_t streams
, uint32_t clients
,
235 struct lttng_live_relay_session
*relay_session
;
237 for (i
= 0; i
< session_list
->len
; i
++) {
238 relay_session
= g_ptr_array_index(session_list
, i
);
239 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
240 strncmp(relay_session
->name
,
241 session_name
, NAME_MAX
) == 0) {
242 relay_session
->streams
+= streams
;
243 if (relay_session
->clients
< clients
)
244 relay_session
->clients
= clients
;
252 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
253 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
254 relay_session
->name
= strndup(session_name
, NAME_MAX
);
255 relay_session
->clients
= clients
;
256 relay_session
->streams
= streams
;
257 relay_session
->timer
= timer
;
258 g_ptr_array_add(session_list
, relay_session
);
261 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
263 struct lttng_viewer_cmd cmd
;
264 struct lttng_viewer_list_sessions list
;
265 struct lttng_viewer_session lsession
;
266 int i
, ret
, sessions_count
, print_list
= 0;
269 GPtrArray
*session_list
= NULL
;
271 if (strlen(ctx
->session_name
) == 0) {
273 session_list
= g_ptr_array_new();
276 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
280 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
282 perror("[error] Error sending cmd");
286 assert(ret_len
== sizeof(cmd
));
288 ret_len
= lttng_live_recv(ctx
->control_sock
, &list
, sizeof(list
));
290 fprintf(stderr
, "[error] Remote side has closed connection\n");
295 perror("[error] Error receiving session list");
299 assert(ret_len
== sizeof(list
));
301 sessions_count
= be32toh(list
.sessions_count
);
302 for (i
= 0; i
< sessions_count
; i
++) {
303 ret_len
= lttng_live_recv(ctx
->control_sock
, &lsession
, sizeof(lsession
));
305 fprintf(stderr
, "[error] Remote side has closed connection\n");
310 perror("[error] Error receiving session");
314 assert(ret_len
== sizeof(lsession
));
315 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
316 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
317 session_id
= be64toh(lsession
.id
);
320 update_session_list(session_list
,
322 lsession
.session_name
,
323 be32toh(lsession
.streams
),
324 be32toh(lsession
.clients
),
325 be32toh(lsession
.live_timer
));
327 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
328 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
329 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
330 printf_verbose("Reading from session %" PRIu64
"\n",
332 g_array_append_val(ctx
->session_ids
,
339 print_session_list(session_list
, path
);
340 free_session_list(session_list
);
349 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
350 uint64_t ctf_trace_id
)
352 struct lttng_live_ctf_trace
*trace
;
355 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
356 (gpointer
) ctf_trace_id
);
358 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
359 trace
->ctf_trace_id
= ctf_trace_id
;
360 trace
->streams
= g_ptr_array_new();
361 g_hash_table_insert(stream
->session
->ctf_traces
,
362 (gpointer
) ctf_trace_id
,
365 if (stream
->metadata_flag
)
366 trace
->metadata_stream
= stream
;
368 stream
->ctf_trace
= trace
;
369 g_ptr_array_add(trace
->streams
, stream
);
375 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
376 char **metadata_buf
, size_t *size
)
380 stream
->metadata_fp_write
=
381 babeltrace_open_memstream(metadata_buf
, size
);
382 if (!stream
->metadata_fp_write
) {
383 perror("Metadata open_memstream");
390 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
392 struct lttng_viewer_cmd cmd
;
393 struct lttng_viewer_attach_session_request rq
;
394 struct lttng_viewer_attach_session_response rp
;
395 struct lttng_viewer_stream stream
;
399 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
400 cmd
.data_size
= sizeof(rq
);
403 memset(&rq
, 0, sizeof(rq
));
404 rq
.session_id
= htobe64(id
);
405 // TODO: add cmd line parameter to select seek beginning
406 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
407 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
409 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
411 perror("[error] Error sending cmd");
415 assert(ret_len
== sizeof(cmd
));
417 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
419 perror("[error] Error sending attach request");
423 assert(ret_len
== sizeof(rq
));
425 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
427 fprintf(stderr
, "[error] Remote side has closed connection\n");
432 perror("[error] Error receiving attach response");
436 assert(ret_len
== sizeof(rp
));
438 switch(be32toh(rp
.status
)) {
439 case LTTNG_VIEWER_ATTACH_OK
:
441 case LTTNG_VIEWER_ATTACH_UNK
:
442 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
444 case LTTNG_VIEWER_ATTACH_ALREADY
:
445 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
448 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
449 fprintf(stderr
, "[error] Not a live session\n");
452 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
453 fprintf(stderr
, "[error] Wrong seek parameter\n");
457 fprintf(stderr
, "[error] Unknown attach return code %u\n",
462 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
467 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
469 * When the session is created but not started, we do an active wait
470 * until it starts. It allows the viewer to start processing the trace
471 * as soon as the session starts.
473 if (ctx
->session
->stream_count
== 0) {
477 printf_verbose("Waiting for %" PRIu64
" streams:\n",
478 ctx
->session
->stream_count
);
479 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
480 ctx
->session
->stream_count
);
481 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
482 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
484 fprintf(stderr
, "[error] Remote side has closed connection\n");
489 perror("[error] Error receiving stream");
493 assert(ret_len
== sizeof(stream
));
494 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
495 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
497 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
498 be64toh(stream
.id
), stream
.path_name
,
499 stream
.channel_name
);
500 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
501 ctx
->session
->streams
[i
].session
= ctx
->session
;
503 ctx
->session
->streams
[i
].first_read
= 1;
504 ctx
->session
->streams
[i
].mmap_size
= 0;
506 if (be32toh(stream
.metadata_flag
)) {
507 ctx
->session
->streams
[i
].metadata_flag
= 1;
509 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
510 be64toh(stream
.ctf_trace_id
));
524 int ask_new_streams(struct lttng_live_ctx
*ctx
)
530 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
531 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
532 ret
= lttng_live_get_new_streams(ctx
, id
);
533 printf_verbose("Asking for new streams returns %d\n",
536 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
537 printf_verbose("Session %" PRIu64
" closed\n",
540 * The streams have already been closed during
541 * the reading, so we only need to get rid of
542 * the trace in our internal table of sessions.
544 g_array_remove_index(ctx
->session_ids
, i
);
546 * We can't continue iterating on the g_array
547 * after a remove, we have to start again.
562 int append_metadata(struct lttng_live_ctx
*ctx
,
563 struct lttng_live_viewer_stream
*viewer_stream
)
566 struct lttng_live_viewer_stream
*metadata
;
567 char *metadata_buf
= NULL
;
569 printf_verbose("get_next_index: new metadata needed\n");
570 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
576 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
577 metadata
->ctf_trace
->metadata_fp
=
578 babeltrace_fmemopen(metadata_buf
,
579 metadata
->metadata_len
, "rb");
580 if (!metadata
->ctf_trace
->metadata_fp
) {
581 perror("Metadata fmemopen");
586 ret
= ctf_append_trace_metadata(
587 viewer_stream
->ctf_trace
->handle
->td
,
588 metadata
->ctf_trace
->metadata_fp
);
590 fprintf(stderr
, "[error] Appending metadata\n");
599 int get_data_packet(struct lttng_live_ctx
*ctx
,
600 struct ctf_stream_pos
*pos
,
601 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
604 struct lttng_viewer_cmd cmd
;
605 struct lttng_viewer_get_packet rq
;
606 struct lttng_viewer_trace_packet rp
;
611 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
612 cmd
.data_size
= sizeof(rq
);
615 memset(&rq
, 0, sizeof(rq
));
616 rq
.stream_id
= htobe64(stream
->id
);
617 /* Already in big endian. */
619 rq
.len
= htobe32(len
);
621 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
623 perror("[error] Error sending cmd");
627 assert(ret_len
== sizeof(cmd
));
629 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
631 perror("[error] Error sending get_data_packet request");
635 assert(ret_len
== sizeof(rq
));
637 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
639 fprintf(stderr
, "[error] Remote side has closed connection\n");
644 perror("[error] Error receiving data response");
648 if (ret_len
!= sizeof(rp
)) {
649 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
650 ", received %" PRId64
"\n", ret_len
,
656 rp
.flags
= be32toh(rp
.flags
);
658 switch (be32toh(rp
.status
)) {
659 case LTTNG_VIEWER_GET_PACKET_OK
:
660 len
= be32toh(rp
.len
);
661 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
664 case LTTNG_VIEWER_GET_PACKET_RETRY
:
665 printf_verbose("get_data_packet: retry\n");
668 case LTTNG_VIEWER_GET_PACKET_ERR
:
669 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
670 printf_verbose("get_data_packet: new metadata needed\n");
671 ret
= append_metadata(ctx
, stream
);
676 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
677 ret
= ask_new_streams(ctx
);
680 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
683 fprintf(stderr
, "[error] get_data_packet: error\n");
686 case LTTNG_VIEWER_GET_PACKET_EOF
:
690 printf_verbose("get_data_packet: unknown\n");
701 if (len
> stream
->mmap_size
) {
704 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
707 ret
= munmap_align(pos
->base_mma
);
709 perror("[error] Unable to unmap old base");
713 pos
->base_mma
= NULL
;
715 pos
->base_mma
= mmap_align(new_size
,
716 PROT_READ
| PROT_WRITE
,
717 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
718 if (pos
->base_mma
== MAP_FAILED
) {
719 perror("[error] mmap error");
720 pos
->base_mma
= NULL
;
725 stream
->mmap_size
= new_size
;
726 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
730 ret_len
= lttng_live_recv(ctx
->control_sock
,
731 mmap_align_addr(pos
->base_mma
), len
);
733 fprintf(stderr
, "[error] Remote side has closed connection\n");
738 perror("[error] Error receiving trace packet");
742 assert(ret_len
== len
);
750 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
751 struct lttng_live_viewer_stream
*metadata_stream
)
755 struct lttng_viewer_cmd cmd
;
756 struct lttng_viewer_get_metadata rq
;
757 struct lttng_viewer_metadata_packet rp
;
761 rq
.stream_id
= htobe64(metadata_stream
->id
);
762 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
763 cmd
.data_size
= sizeof(rq
);
766 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
768 perror("[error] Error sending cmd");
772 assert(ret_len
== sizeof(cmd
));
774 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
776 perror("[error] Error sending get_metadata request");
780 assert(ret_len
== sizeof(rq
));
782 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
784 fprintf(stderr
, "[error] Remote side has closed connection\n");
789 perror("[error] Error receiving metadata response");
793 assert(ret_len
== sizeof(rp
));
795 switch (be32toh(rp
.status
)) {
796 case LTTNG_VIEWER_METADATA_OK
:
797 printf_verbose("get_metadata : OK\n");
799 case LTTNG_VIEWER_NO_NEW_METADATA
:
800 printf_verbose("get_metadata : NO NEW\n");
803 case LTTNG_VIEWER_METADATA_ERR
:
804 printf_verbose("get_metadata : ERR\n");
808 printf_verbose("get_metadata : UNKNOWN\n");
813 len
= be64toh(rp
.len
);
814 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
822 perror("relay data zmalloc");
826 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
828 fprintf(stderr
, "[error] Remote side has closed connection\n");
834 perror("[error] Error receiving trace packet");
839 assert(ret_len
== len
);
842 ret_len
= fwrite(data
, 1, len
,
843 metadata_stream
->metadata_fp_write
);
844 } while (ret_len
< 0 && errno
== EINTR
);
846 fprintf(stderr
, "[error] Writing in the metadata fp\n");
851 assert(ret_len
== len
);
852 metadata_stream
->metadata_len
+= len
;
863 * Return 0 on success, a negative value on error.
866 int get_new_metadata(struct lttng_live_ctx
*ctx
,
867 struct lttng_live_viewer_stream
*viewer_stream
,
871 struct lttng_live_viewer_stream
*metadata_stream
;
872 size_t size
, len_read
= 0;;
874 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
875 if (!metadata_stream
) {
876 fprintf(stderr
, "[error] No metadata stream\n");
880 metadata_stream
->metadata_len
= 0;
881 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
888 * get_one_metadata_packet returns the number of bytes
889 * received, 0 when we have received everything, a
890 * negative value on error.
892 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
896 } while (ret
> 0 || !len_read
);
898 if (fclose(metadata_stream
->metadata_fp_write
))
900 metadata_stream
->metadata_fp_write
= NULL
;
907 * Get one index for a stream.
909 * Returns 0 on success or a negative value on error.
912 int get_next_index(struct lttng_live_ctx
*ctx
,
913 struct lttng_live_viewer_stream
*viewer_stream
,
914 struct packet_index
*index
)
916 struct lttng_viewer_cmd cmd
;
917 struct lttng_viewer_get_next_index rq
;
918 struct lttng_viewer_index rp
;
922 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
923 cmd
.data_size
= sizeof(rq
);
926 memset(&rq
, 0, sizeof(rq
));
927 rq
.stream_id
= htobe64(viewer_stream
->id
);
930 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
932 perror("[error] Error sending cmd");
936 assert(ret_len
== sizeof(cmd
));
938 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
940 perror("[error] Error sending get_next_index request");
944 assert(ret_len
== sizeof(rq
));
946 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
948 fprintf(stderr
, "[error] Remote side has closed connection\n");
953 perror("[error] Error receiving index response");
957 assert(ret_len
== sizeof(rp
));
959 rp
.flags
= be32toh(rp
.flags
);
961 switch (be32toh(rp
.status
)) {
962 case LTTNG_VIEWER_INDEX_INACTIVE
:
963 printf_verbose("get_next_index: inactive\n");
964 memset(index
, 0, sizeof(struct packet_index
));
965 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
967 case LTTNG_VIEWER_INDEX_OK
:
968 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
969 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
970 index
->offset
= be64toh(rp
.offset
);
971 index
->packet_size
= be64toh(rp
.packet_size
);
972 index
->content_size
= be64toh(rp
.content_size
);
973 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
974 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
975 index
->events_discarded
= be64toh(rp
.events_discarded
);
977 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
978 ret
= append_metadata(ctx
, viewer_stream
);
982 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
983 ret
= ask_new_streams(ctx
);
986 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
990 case LTTNG_VIEWER_INDEX_RETRY
:
991 printf_verbose("get_next_index: retry\n");
994 case LTTNG_VIEWER_INDEX_HUP
:
995 printf_verbose("get_next_index: stream hung up\n");
996 viewer_stream
->id
= -1ULL;
998 ctx
->session
->stream_count
--;
1000 case LTTNG_VIEWER_INDEX_ERR
:
1001 fprintf(stderr
, "[error] get_next_index: error\n");
1005 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1017 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1020 struct ctf_stream_pos
*pos
;
1021 struct ctf_file_stream
*file_stream
;
1022 struct packet_index
*prev_index
= NULL
, *cur_index
;
1023 struct lttng_live_viewer_stream
*viewer_stream
;
1024 struct lttng_live_session
*session
;
1028 pos
= ctf_pos(stream_pos
);
1029 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1030 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1031 session
= viewer_stream
->session
;
1033 switch (pos
->packet_index
->len
) {
1035 g_array_set_size(pos
->packet_index
, 1);
1036 cur_index
= &g_array_index(pos
->packet_index
,
1037 struct packet_index
, 0);
1040 g_array_set_size(pos
->packet_index
, 2);
1041 prev_index
= &g_array_index(pos
->packet_index
,
1042 struct packet_index
, 0);
1043 cur_index
= &g_array_index(pos
->packet_index
,
1044 struct packet_index
, 1);
1047 g_array_index(pos
->packet_index
,
1048 struct packet_index
, 0) =
1049 g_array_index(pos
->packet_index
,
1050 struct packet_index
, 1);
1051 prev_index
= &g_array_index(pos
->packet_index
,
1052 struct packet_index
, 0);
1053 cur_index
= &g_array_index(pos
->packet_index
,
1054 struct packet_index
, 1);
1060 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1061 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1064 fprintf(stderr
, "[error] get_next_index failed\n");
1068 pos
->packet_size
= cur_index
->packet_size
;
1069 pos
->content_size
= cur_index
->content_size
;
1070 pos
->mmap_base_offset
= 0;
1071 if (cur_index
->offset
== EOF
) {
1077 if (cur_index
->content_size
== 0) {
1078 file_stream
->parent
.cycles_timestamp
=
1079 cur_index
->ts_cycles
.timestamp_end
;
1080 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1081 &file_stream
->parent
,
1082 cur_index
->ts_cycles
.timestamp_end
);
1084 /* Convert the timestamps and append to the real_index. */
1085 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1086 &file_stream
->parent
,
1087 cur_index
->ts_cycles
.timestamp_begin
);
1088 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1089 &file_stream
->parent
,
1090 cur_index
->ts_cycles
.timestamp_end
);
1092 ctf_update_current_packet_index(&file_stream
->parent
,
1093 prev_index
, cur_index
);
1095 file_stream
->parent
.cycles_timestamp
=
1096 cur_index
->ts_cycles
.timestamp_begin
;
1097 file_stream
->parent
.real_timestamp
=
1098 cur_index
->ts_real
.timestamp_begin
;
1101 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1105 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1107 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1108 be64toh(cur_index
->offset
),
1109 cur_index
->packet_size
/ CHAR_BIT
);
1112 } else if (ret
< 0) {
1114 fprintf(stderr
, "[error] get_data_packet failed\n");
1118 printf_verbose("Index received : packet_size : %" PRIu64
1119 ", offset %" PRIu64
", content_size %" PRIu64
1120 ", timestamp_end : %" PRIu64
"\n",
1121 cur_index
->packet_size
, cur_index
->offset
,
1122 cur_index
->content_size
,
1123 cur_index
->ts_cycles
.timestamp_end
);
1125 /* update trace_packet_header and stream_packet_context */
1126 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1127 /* Read packet header */
1128 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1131 fprintf(stderr
, "[error] trace packet header read failed\n");
1135 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1136 /* Read packet context */
1137 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1140 fprintf(stderr
, "[error] stream packet context read failed\n");
1144 pos
->data_offset
= pos
->offset
;
1150 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1152 struct lttng_viewer_cmd cmd
;
1153 struct lttng_viewer_create_session_response resp
;
1157 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1159 cmd
.cmd_version
= 0;
1161 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1163 perror("[error] Error sending cmd");
1167 assert(ret_len
== sizeof(cmd
));
1169 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1171 fprintf(stderr
, "[error] Remote side has closed connection\n");
1176 perror("[error] Error receiving create session reply");
1180 assert(ret_len
== sizeof(resp
));
1182 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1183 fprintf(stderr
, "[error] Error creating viewer session\n");
1194 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1196 struct bt_context
*bt_ctx
= user_data
;
1197 struct lttng_live_ctf_trace
*trace
= value
;
1200 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1202 fprintf(stderr
, "[error] removing trace from context\n");
1204 /* remove the key/value pair from the HT. */
1209 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1212 struct bt_context
*bt_ctx
= user_data
;
1213 struct lttng_live_ctf_trace
*trace
= value
;
1214 struct lttng_live_viewer_stream
*stream
;
1215 struct bt_mmap_stream
*new_mmap_stream
;
1216 struct bt_mmap_stream_list mmap_list
;
1217 struct lttng_live_ctx
*ctx
= NULL
;
1218 struct bt_trace_descriptor
*td
;
1219 struct bt_trace_handle
*handle
;
1222 * We don't know how many streams we will receive for a trace, so
1223 * once we are done receiving the traces, we add all the traces
1224 * received to the bt_context.
1225 * We can receive streams during the attach command or the
1226 * get_new_streams, so we have to make sure not to add multiple
1227 * times the same traces.
1228 * If a trace is already in the context, we just skip this function.
1233 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1235 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1236 stream
= g_ptr_array_index(trace
->streams
, i
);
1237 ctx
= stream
->session
->ctx
;
1239 if (!stream
->metadata_flag
) {
1240 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1241 new_mmap_stream
->priv
= (void *) stream
;
1242 new_mmap_stream
->fd
= -1;
1243 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1245 char *metadata_buf
= NULL
;
1247 /* Get all possible metadata before starting */
1248 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1253 if (!stream
->metadata_len
) {
1254 fprintf(stderr
, "[error] empty metadata\n");
1260 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1261 stream
->metadata_len
, "rb");
1262 if (!trace
->metadata_fp
) {
1263 perror("Metadata fmemopen");
1271 if (!trace
->metadata_fp
) {
1272 fprintf(stderr
, "[error] No metadata stream opened\n");
1276 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1277 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1279 fprintf(stderr
, "[error] Error adding trace\n");
1282 trace
->metadata_stream
->metadata_len
= 0;
1284 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1285 bt_ctx
->trace_handles
,
1286 (gpointer
) (unsigned long) ret
);
1288 trace
->handle
= handle
;
1289 if (bt_ctx
->current_iterator
) {
1290 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1293 trace
->trace_id
= ret
;
1299 bt_context_put(bt_ctx
);
1304 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1306 struct lttng_viewer_cmd cmd
;
1307 struct lttng_viewer_new_streams_request rq
;
1308 struct lttng_viewer_new_streams_response rp
;
1309 struct lttng_viewer_stream stream
;
1312 uint32_t stream_count
;
1314 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1315 cmd
.data_size
= sizeof(rq
);
1316 cmd
.cmd_version
= 0;
1318 memset(&rq
, 0, sizeof(rq
));
1319 rq
.session_id
= htobe64(id
);
1321 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1323 perror("[error] Error sending cmd");
1327 assert(ret_len
== sizeof(cmd
));
1329 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
1331 perror("[error] Error sending get_new_streams request");
1335 assert(ret_len
== sizeof(rq
));
1337 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1339 fprintf(stderr
, "[error] Remote side has closed connection\n");
1344 perror("[error] Error receiving get_new_streams response");
1348 assert(ret_len
== sizeof(rp
));
1350 switch(be32toh(rp
.status
)) {
1351 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1353 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1356 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1357 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1359 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1360 fprintf(stderr
, "[error] get_new_streams error\n");
1364 fprintf(stderr
, "[error] Unknown return code %u\n",
1365 be32toh(rp
.status
));
1370 stream_count
= be32toh(rp
.streams_count
);
1371 ctx
->session
->stream_count
+= stream_count
;
1373 * When the session is created but not started, we do an active wait
1374 * until it starts. It allows the viewer to start processing the trace
1375 * as soon as the session starts.
1377 if (ctx
->session
->stream_count
== 0) {
1381 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1382 ctx
->session
->stream_count
);
1383 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1384 ctx
->session
->stream_count
);
1385 for (i
= 0; i
< stream_count
; i
++) {
1386 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
1388 fprintf(stderr
, "[error] Remote side has closed connection\n");
1393 perror("[error] Error receiving stream");
1397 assert(ret_len
== sizeof(stream
));
1398 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1399 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1401 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1402 be64toh(stream
.id
), stream
.path_name
,
1403 stream
.channel_name
);
1404 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1405 ctx
->session
->streams
[i
].session
= ctx
->session
;
1407 ctx
->session
->streams
[i
].first_read
= 1;
1408 ctx
->session
->streams
[i
].mmap_size
= 0;
1410 if (be32toh(stream
.metadata_flag
)) {
1411 ctx
->session
->streams
[i
].metadata_flag
= 1;
1413 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1414 be64toh(stream
.ctf_trace_id
));
1427 void lttng_live_read(struct lttng_live_ctx
*ctx
)
1430 struct bt_ctf_iter
*iter
;
1431 const struct bt_ctf_event
*event
;
1432 struct bt_iter_pos begin_pos
;
1433 struct bt_trace_descriptor
*td_write
;
1434 struct bt_format
*fmt_write
;
1435 struct ctf_text_stream_pos
*sout
;
1438 ctx
->bt_ctx
= bt_context_create();
1440 fprintf(stderr
, "[error] bt_context_create allocation\n");
1444 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1446 fprintf(stderr
, "[error] ctf-text error\n");
1450 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1452 fprintf(stderr
, "[error] Error opening output trace\n");
1456 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1458 if (!sout
->parent
.event_cb
)
1461 ret
= lttng_live_create_viewer_session(ctx
);
1466 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1467 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1468 printf_verbose("Attaching to session %lu\n", id
);
1469 ret
= lttng_live_attach_session(ctx
, id
);
1470 printf_verbose("Attaching session returns %d\n", ret
);
1472 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1473 fprintf(stderr
, "[error] Unknown session ID\n");
1480 * As long as the session is active, we try to get new streams.
1485 while (!ctx
->session
->stream_count
) {
1486 if (ctx
->session_ids
->len
== 0)
1488 ret
= ask_new_streams(ctx
);
1493 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1496 begin_pos
.type
= BT_SEEK_BEGIN
;
1497 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1499 fprintf(stderr
, "[error] Iterator creation error\n");
1503 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1504 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1509 ret
= sout
->parent
.event_cb(&sout
->parent
,
1510 event
->parent
->stream
);
1512 fprintf(stderr
, "[error] Writing "
1517 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1522 bt_ctf_iter_destroy(iter
);
1523 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1524 del_traces
, ctx
->bt_ctx
);
1525 ctx
->session
->stream_count
= 0;
1529 bt_context_put(ctx
->bt_ctx
);