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>
38 #include <babeltrace/ctf/ctf-index.h>
40 #include <babeltrace/babeltrace.h>
41 #include <babeltrace/ctf/events.h>
42 #include <babeltrace/ctf/callbacks.h>
43 #include <babeltrace/ctf/iterator.h>
45 /* for packet_index */
46 #include <babeltrace/ctf/types.h>
48 #include <babeltrace/ctf/metadata.h>
49 #include <babeltrace/ctf-text/types.h>
50 #include <babeltrace/ctf/events-internal.h>
51 #include <formats/ctf/events-private.h>
53 #include <babeltrace/compat/memstream.h>
55 #include "lttng-live.h"
56 #include "lttng-viewer-abi.h"
58 #define ACTIVE_POLL_DELAY 100 /* ms */
61 * Memory allocation zeroed
63 #define zmalloc(x) calloc(1, x)
66 #define max_t(type, a, b) \
67 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
70 static void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
,
71 size_t index
, int whence
);
72 static void add_traces(gpointer key
, gpointer value
, gpointer user_data
);
73 static int del_traces(gpointer key
, gpointer value
, gpointer user_data
);
74 static int get_new_metadata(struct lttng_live_ctx
*ctx
,
75 struct lttng_live_viewer_stream
*viewer_stream
,
79 ssize_t
lttng_live_recv(int fd
, void *buf
, size_t len
)
82 size_t copied
= 0, to_copy
= len
;
85 ret
= recv(fd
, buf
+ copied
, to_copy
, 0);
87 assert(ret
<= to_copy
);
91 } while ((ret
> 0 && to_copy
> 0)
92 || (ret
< 0 && errno
== EINTR
));
95 /* ret = 0 means orderly shutdown, ret < 0 is error. */
100 ssize_t
lttng_live_send(int fd
, const void *buf
, size_t len
)
105 ret
= send(fd
, buf
, len
, MSG_NOSIGNAL
);
106 } while (ret
< 0 && errno
== EINTR
);
110 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
112 struct hostent
*host
;
113 struct sockaddr_in server_addr
;
116 host
= gethostbyname(ctx
->relay_hostname
);
122 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
128 server_addr
.sin_family
= AF_INET
;
129 server_addr
.sin_port
= htons(ctx
->port
);
130 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
131 bzero(&(server_addr
.sin_zero
), 8);
133 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
134 sizeof(struct sockaddr
)) == -1) {
146 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
148 struct lttng_viewer_cmd cmd
;
149 struct lttng_viewer_connect connect
;
153 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
154 cmd
.data_size
= sizeof(connect
);
157 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
158 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
159 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
160 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
162 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
164 perror("[error] Error sending cmd");
168 assert(ret_len
== sizeof(cmd
));
170 ret_len
= lttng_live_send(ctx
->control_sock
, &connect
, sizeof(connect
));
172 perror("[error] Error sending version");
176 assert(ret_len
== sizeof(connect
));
178 ret_len
= lttng_live_recv(ctx
->control_sock
, &connect
, sizeof(connect
));
180 fprintf(stderr
, "[error] Remote side has closed connection\n");
185 perror("[error] Error receiving version");
189 assert(ret_len
== sizeof(connect
));
191 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
192 be64toh(connect
.viewer_session_id
));
193 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
194 be32toh(connect
.minor
));
203 void free_session_list(GPtrArray
*session_list
)
206 struct lttng_live_relay_session
*relay_session
;
208 for (i
= 0; i
< session_list
->len
; i
++) {
209 relay_session
= g_ptr_array_index(session_list
, i
);
210 free(relay_session
->name
);
211 free(relay_session
->hostname
);
213 g_ptr_array_free(session_list
, TRUE
);
217 void print_session_list(GPtrArray
*session_list
, const char *path
)
220 struct lttng_live_relay_session
*relay_session
;
222 for (i
= 0; i
< session_list
->len
; i
++) {
223 relay_session
= g_ptr_array_index(session_list
, i
);
224 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
225 "%u stream(s), %u client(s) connected)\n",
226 path
, relay_session
->hostname
,
227 relay_session
->name
, relay_session
->timer
,
228 relay_session
->streams
, relay_session
->clients
);
233 void update_session_list(GPtrArray
*session_list
, char *hostname
,
234 char *session_name
, uint32_t streams
, uint32_t clients
,
238 struct lttng_live_relay_session
*relay_session
;
240 for (i
= 0; i
< session_list
->len
; i
++) {
241 relay_session
= g_ptr_array_index(session_list
, i
);
242 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
243 strncmp(relay_session
->name
,
244 session_name
, NAME_MAX
) == 0) {
245 relay_session
->streams
+= streams
;
246 if (relay_session
->clients
< clients
)
247 relay_session
->clients
= clients
;
255 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
256 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
257 relay_session
->name
= strndup(session_name
, NAME_MAX
);
258 relay_session
->clients
= clients
;
259 relay_session
->streams
= streams
;
260 relay_session
->timer
= timer
;
261 g_ptr_array_add(session_list
, relay_session
);
264 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
266 struct lttng_viewer_cmd cmd
;
267 struct lttng_viewer_list_sessions list
;
268 struct lttng_viewer_session lsession
;
269 int i
, ret
, sessions_count
, print_list
= 0;
272 GPtrArray
*session_list
= NULL
;
274 if (strlen(ctx
->session_name
) == 0) {
276 session_list
= g_ptr_array_new();
279 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
283 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
285 perror("[error] Error sending cmd");
289 assert(ret_len
== sizeof(cmd
));
291 ret_len
= lttng_live_recv(ctx
->control_sock
, &list
, sizeof(list
));
293 fprintf(stderr
, "[error] Remote side has closed connection\n");
298 perror("[error] Error receiving session list");
302 assert(ret_len
== sizeof(list
));
304 sessions_count
= be32toh(list
.sessions_count
);
305 for (i
= 0; i
< sessions_count
; i
++) {
306 ret_len
= lttng_live_recv(ctx
->control_sock
, &lsession
, sizeof(lsession
));
308 fprintf(stderr
, "[error] Remote side has closed connection\n");
313 perror("[error] Error receiving session");
317 assert(ret_len
== sizeof(lsession
));
318 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
319 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
320 session_id
= be64toh(lsession
.id
);
323 update_session_list(session_list
,
325 lsession
.session_name
,
326 be32toh(lsession
.streams
),
327 be32toh(lsession
.clients
),
328 be32toh(lsession
.live_timer
));
330 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
331 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
332 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
333 printf_verbose("Reading from session %" PRIu64
"\n",
335 g_array_append_val(ctx
->session_ids
,
342 print_session_list(session_list
, path
);
343 free_session_list(session_list
);
352 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
353 uint64_t ctf_trace_id
)
355 struct lttng_live_ctf_trace
*trace
;
358 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
359 (gpointer
) ctf_trace_id
);
361 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
362 trace
->ctf_trace_id
= ctf_trace_id
;
363 trace
->streams
= g_ptr_array_new();
364 g_hash_table_insert(stream
->session
->ctf_traces
,
365 (gpointer
) ctf_trace_id
,
368 if (stream
->metadata_flag
)
369 trace
->metadata_stream
= stream
;
371 stream
->ctf_trace
= trace
;
372 g_ptr_array_add(trace
->streams
, stream
);
378 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
379 char **metadata_buf
, size_t *size
)
383 stream
->metadata_fp_write
=
384 babeltrace_open_memstream(metadata_buf
, size
);
385 if (!stream
->metadata_fp_write
) {
386 perror("Metadata open_memstream");
393 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
395 struct lttng_viewer_cmd cmd
;
396 struct lttng_viewer_attach_session_request rq
;
397 struct lttng_viewer_attach_session_response rp
;
398 struct lttng_viewer_stream stream
;
402 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
403 cmd
.data_size
= sizeof(rq
);
406 memset(&rq
, 0, sizeof(rq
));
407 rq
.session_id
= htobe64(id
);
408 // TODO: add cmd line parameter to select seek beginning
409 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
410 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
412 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
414 perror("[error] Error sending cmd");
418 assert(ret_len
== sizeof(cmd
));
420 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
422 perror("[error] Error sending attach request");
426 assert(ret_len
== sizeof(rq
));
428 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
430 fprintf(stderr
, "[error] Remote side has closed connection\n");
435 perror("[error] Error receiving attach response");
439 assert(ret_len
== sizeof(rp
));
441 switch(be32toh(rp
.status
)) {
442 case LTTNG_VIEWER_ATTACH_OK
:
444 case LTTNG_VIEWER_ATTACH_UNK
:
445 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
447 case LTTNG_VIEWER_ATTACH_ALREADY
:
448 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
451 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
452 fprintf(stderr
, "[error] Not a live session\n");
455 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
456 fprintf(stderr
, "[error] Wrong seek parameter\n");
460 fprintf(stderr
, "[error] Unknown attach return code %u\n",
465 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
470 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
472 * When the session is created but not started, we do an active wait
473 * until it starts. It allows the viewer to start processing the trace
474 * as soon as the session starts.
476 if (ctx
->session
->stream_count
== 0) {
480 printf_verbose("Waiting for %" PRIu64
" streams:\n",
481 ctx
->session
->stream_count
);
482 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
483 ctx
->session
->stream_count
);
484 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
485 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
487 fprintf(stderr
, "[error] Remote side has closed connection\n");
492 perror("[error] Error receiving stream");
496 assert(ret_len
== sizeof(stream
));
497 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
498 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
500 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
501 be64toh(stream
.id
), stream
.path_name
,
502 stream
.channel_name
);
503 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
504 ctx
->session
->streams
[i
].session
= ctx
->session
;
506 ctx
->session
->streams
[i
].first_read
= 1;
507 ctx
->session
->streams
[i
].mmap_size
= 0;
509 if (be32toh(stream
.metadata_flag
)) {
510 ctx
->session
->streams
[i
].metadata_flag
= 1;
512 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
513 be64toh(stream
.ctf_trace_id
));
527 int ask_new_streams(struct lttng_live_ctx
*ctx
)
533 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
534 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
535 ret
= lttng_live_get_new_streams(ctx
, id
);
536 printf_verbose("Asking for new streams returns %d\n",
539 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
540 printf_verbose("Session %" PRIu64
" closed\n",
543 * The streams have already been closed during
544 * the reading, so we only need to get rid of
545 * the trace in our internal table of sessions.
547 g_array_remove_index(ctx
->session_ids
, i
);
549 * We can't continue iterating on the g_array
550 * after a remove, we have to start again.
565 int append_metadata(struct lttng_live_ctx
*ctx
,
566 struct lttng_live_viewer_stream
*viewer_stream
)
569 struct lttng_live_viewer_stream
*metadata
;
570 char *metadata_buf
= NULL
;
572 printf_verbose("get_next_index: new metadata needed\n");
573 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
579 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
580 metadata
->ctf_trace
->metadata_fp
=
581 babeltrace_fmemopen(metadata_buf
,
582 metadata
->metadata_len
, "rb");
583 if (!metadata
->ctf_trace
->metadata_fp
) {
584 perror("Metadata fmemopen");
589 ret
= ctf_append_trace_metadata(
590 viewer_stream
->ctf_trace
->handle
->td
,
591 metadata
->ctf_trace
->metadata_fp
);
592 /* We accept empty metadata packets */
593 if (ret
!= 0 && ret
!= -ENOENT
) {
594 fprintf(stderr
, "[error] Appending metadata\n");
604 int get_data_packet(struct lttng_live_ctx
*ctx
,
605 struct ctf_stream_pos
*pos
,
606 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
609 struct lttng_viewer_cmd cmd
;
610 struct lttng_viewer_get_packet rq
;
611 struct lttng_viewer_trace_packet rp
;
616 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
617 cmd
.data_size
= sizeof(rq
);
620 memset(&rq
, 0, sizeof(rq
));
621 rq
.stream_id
= htobe64(stream
->id
);
622 /* Already in big endian. */
624 rq
.len
= htobe32(len
);
626 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
628 perror("[error] Error sending cmd");
632 assert(ret_len
== sizeof(cmd
));
634 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
636 perror("[error] Error sending get_data_packet request");
640 assert(ret_len
== sizeof(rq
));
642 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
644 fprintf(stderr
, "[error] Remote side has closed connection\n");
649 perror("[error] Error receiving data response");
653 if (ret_len
!= sizeof(rp
)) {
654 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
655 ", received %" PRId64
"\n", ret_len
,
661 rp
.flags
= be32toh(rp
.flags
);
663 switch (be32toh(rp
.status
)) {
664 case LTTNG_VIEWER_GET_PACKET_OK
:
665 len
= be32toh(rp
.len
);
666 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
669 case LTTNG_VIEWER_GET_PACKET_RETRY
:
670 printf_verbose("get_data_packet: retry\n");
673 case LTTNG_VIEWER_GET_PACKET_ERR
:
674 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
675 printf_verbose("get_data_packet: new metadata needed\n");
676 ret
= append_metadata(ctx
, stream
);
681 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
682 ret
= ask_new_streams(ctx
);
685 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
688 fprintf(stderr
, "[error] get_data_packet: error\n");
691 case LTTNG_VIEWER_GET_PACKET_EOF
:
695 printf_verbose("get_data_packet: unknown\n");
706 if (len
> stream
->mmap_size
) {
709 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
712 ret
= munmap_align(pos
->base_mma
);
714 perror("[error] Unable to unmap old base");
718 pos
->base_mma
= NULL
;
720 pos
->base_mma
= mmap_align(new_size
,
721 PROT_READ
| PROT_WRITE
,
722 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
723 if (pos
->base_mma
== MAP_FAILED
) {
724 perror("[error] mmap error");
725 pos
->base_mma
= NULL
;
730 stream
->mmap_size
= new_size
;
731 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
735 ret_len
= lttng_live_recv(ctx
->control_sock
,
736 mmap_align_addr(pos
->base_mma
), len
);
738 fprintf(stderr
, "[error] Remote side has closed connection\n");
743 perror("[error] Error receiving trace packet");
747 assert(ret_len
== len
);
755 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
756 struct lttng_live_viewer_stream
*metadata_stream
)
760 struct lttng_viewer_cmd cmd
;
761 struct lttng_viewer_get_metadata rq
;
762 struct lttng_viewer_metadata_packet rp
;
766 rq
.stream_id
= htobe64(metadata_stream
->id
);
767 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
768 cmd
.data_size
= sizeof(rq
);
771 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
773 perror("[error] Error sending cmd");
777 assert(ret_len
== sizeof(cmd
));
779 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
781 perror("[error] Error sending get_metadata request");
785 assert(ret_len
== sizeof(rq
));
787 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
789 fprintf(stderr
, "[error] Remote side has closed connection\n");
794 perror("[error] Error receiving metadata response");
798 assert(ret_len
== sizeof(rp
));
800 switch (be32toh(rp
.status
)) {
801 case LTTNG_VIEWER_METADATA_OK
:
802 printf_verbose("get_metadata : OK\n");
804 case LTTNG_VIEWER_NO_NEW_METADATA
:
805 printf_verbose("get_metadata : NO NEW\n");
808 case LTTNG_VIEWER_METADATA_ERR
:
809 printf_verbose("get_metadata : ERR\n");
813 printf_verbose("get_metadata : UNKNOWN\n");
818 len
= be64toh(rp
.len
);
819 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
827 perror("relay data zmalloc");
831 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
833 fprintf(stderr
, "[error] Remote side has closed connection\n");
839 perror("[error] Error receiving trace packet");
844 assert(ret_len
== len
);
847 ret_len
= fwrite(data
, 1, len
,
848 metadata_stream
->metadata_fp_write
);
849 } while (ret_len
< 0 && errno
== EINTR
);
851 fprintf(stderr
, "[error] Writing in the metadata fp\n");
856 assert(ret_len
== len
);
857 metadata_stream
->metadata_len
+= len
;
868 * Return 0 on success, a negative value on error.
871 int get_new_metadata(struct lttng_live_ctx
*ctx
,
872 struct lttng_live_viewer_stream
*viewer_stream
,
876 struct lttng_live_viewer_stream
*metadata_stream
;
877 size_t size
, len_read
= 0;;
879 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
880 if (!metadata_stream
) {
881 fprintf(stderr
, "[error] No metadata stream\n");
885 metadata_stream
->metadata_len
= 0;
886 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
893 * get_one_metadata_packet returns the number of bytes
894 * received, 0 when we have received everything, a
895 * negative value on error.
897 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
902 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
904 } while (ret
> 0 || !len_read
);
906 if (fclose(metadata_stream
->metadata_fp_write
))
908 metadata_stream
->metadata_fp_write
= NULL
;
915 * Get one index for a stream.
917 * Returns 0 on success or a negative value on error.
920 int get_next_index(struct lttng_live_ctx
*ctx
,
921 struct lttng_live_viewer_stream
*viewer_stream
,
922 struct packet_index
*index
)
924 struct lttng_viewer_cmd cmd
;
925 struct lttng_viewer_get_next_index rq
;
926 struct lttng_viewer_index rp
;
930 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
931 cmd
.data_size
= sizeof(rq
);
934 memset(&rq
, 0, sizeof(rq
));
935 rq
.stream_id
= htobe64(viewer_stream
->id
);
938 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
940 perror("[error] Error sending cmd");
944 assert(ret_len
== sizeof(cmd
));
946 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
948 perror("[error] Error sending get_next_index request");
952 assert(ret_len
== sizeof(rq
));
954 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
956 fprintf(stderr
, "[error] Remote side has closed connection\n");
961 perror("[error] Error receiving index response");
965 assert(ret_len
== sizeof(rp
));
967 rp
.flags
= be32toh(rp
.flags
);
969 switch (be32toh(rp
.status
)) {
970 case LTTNG_VIEWER_INDEX_INACTIVE
:
971 printf_verbose("get_next_index: inactive\n");
972 memset(index
, 0, sizeof(struct packet_index
));
973 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
975 case LTTNG_VIEWER_INDEX_OK
:
976 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
977 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
978 index
->offset
= be64toh(rp
.offset
);
979 index
->packet_size
= be64toh(rp
.packet_size
);
980 index
->content_size
= be64toh(rp
.content_size
);
981 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
982 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
983 index
->events_discarded
= be64toh(rp
.events_discarded
);
985 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
986 ret
= append_metadata(ctx
, viewer_stream
);
990 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
991 ret
= ask_new_streams(ctx
);
994 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
998 case LTTNG_VIEWER_INDEX_RETRY
:
999 printf_verbose("get_next_index: retry\n");
1000 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1002 case LTTNG_VIEWER_INDEX_HUP
:
1003 printf_verbose("get_next_index: stream hung up\n");
1004 viewer_stream
->id
= -1ULL;
1005 index
->offset
= EOF
;
1006 ctx
->session
->stream_count
--;
1008 case LTTNG_VIEWER_INDEX_ERR
:
1009 fprintf(stderr
, "[error] get_next_index: error\n");
1013 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1025 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1028 struct ctf_stream_pos
*pos
;
1029 struct ctf_file_stream
*file_stream
;
1030 struct packet_index
*prev_index
= NULL
, *cur_index
;
1031 struct lttng_live_viewer_stream
*viewer_stream
;
1032 struct lttng_live_session
*session
;
1036 pos
= ctf_pos(stream_pos
);
1037 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1038 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1039 session
= viewer_stream
->session
;
1041 switch (pos
->packet_index
->len
) {
1043 g_array_set_size(pos
->packet_index
, 1);
1044 cur_index
= &g_array_index(pos
->packet_index
,
1045 struct packet_index
, 0);
1048 g_array_set_size(pos
->packet_index
, 2);
1049 prev_index
= &g_array_index(pos
->packet_index
,
1050 struct packet_index
, 0);
1051 cur_index
= &g_array_index(pos
->packet_index
,
1052 struct packet_index
, 1);
1055 g_array_index(pos
->packet_index
,
1056 struct packet_index
, 0) =
1057 g_array_index(pos
->packet_index
,
1058 struct packet_index
, 1);
1059 prev_index
= &g_array_index(pos
->packet_index
,
1060 struct packet_index
, 0);
1061 cur_index
= &g_array_index(pos
->packet_index
,
1062 struct packet_index
, 1);
1068 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1069 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1072 fprintf(stderr
, "[error] get_next_index failed\n");
1076 pos
->packet_size
= cur_index
->packet_size
;
1077 pos
->content_size
= cur_index
->content_size
;
1078 pos
->mmap_base_offset
= 0;
1079 if (cur_index
->offset
== EOF
) {
1085 if (cur_index
->content_size
== 0) {
1086 file_stream
->parent
.cycles_timestamp
=
1087 cur_index
->ts_cycles
.timestamp_end
;
1088 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1089 &file_stream
->parent
,
1090 cur_index
->ts_cycles
.timestamp_end
);
1092 /* Convert the timestamps and append to the real_index. */
1093 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1094 &file_stream
->parent
,
1095 cur_index
->ts_cycles
.timestamp_begin
);
1096 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1097 &file_stream
->parent
,
1098 cur_index
->ts_cycles
.timestamp_end
);
1100 ctf_update_current_packet_index(&file_stream
->parent
,
1101 prev_index
, cur_index
);
1103 file_stream
->parent
.cycles_timestamp
=
1104 cur_index
->ts_cycles
.timestamp_begin
;
1105 file_stream
->parent
.real_timestamp
=
1106 cur_index
->ts_real
.timestamp_begin
;
1109 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1113 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1115 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1116 be64toh(cur_index
->offset
),
1117 cur_index
->packet_size
/ CHAR_BIT
);
1120 } else if (ret
< 0) {
1122 fprintf(stderr
, "[error] get_data_packet failed\n");
1126 printf_verbose("Index received : packet_size : %" PRIu64
1127 ", offset %" PRIu64
", content_size %" PRIu64
1128 ", timestamp_end : %" PRIu64
"\n",
1129 cur_index
->packet_size
, cur_index
->offset
,
1130 cur_index
->content_size
,
1131 cur_index
->ts_cycles
.timestamp_end
);
1133 /* update trace_packet_header and stream_packet_context */
1134 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1135 /* Read packet header */
1136 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1139 fprintf(stderr
, "[error] trace packet header read failed\n");
1143 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1144 /* Read packet context */
1145 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1148 fprintf(stderr
, "[error] stream packet context read failed\n");
1152 pos
->data_offset
= pos
->offset
;
1158 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1160 struct lttng_viewer_cmd cmd
;
1161 struct lttng_viewer_create_session_response resp
;
1165 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1167 cmd
.cmd_version
= 0;
1169 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1171 perror("[error] Error sending cmd");
1175 assert(ret_len
== sizeof(cmd
));
1177 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1179 fprintf(stderr
, "[error] Remote side has closed connection\n");
1184 perror("[error] Error receiving create session reply");
1188 assert(ret_len
== sizeof(resp
));
1190 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1191 fprintf(stderr
, "[error] Error creating viewer session\n");
1202 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1204 struct bt_context
*bt_ctx
= user_data
;
1205 struct lttng_live_ctf_trace
*trace
= value
;
1208 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1210 fprintf(stderr
, "[error] removing trace from context\n");
1212 /* remove the key/value pair from the HT. */
1217 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1220 struct bt_context
*bt_ctx
= user_data
;
1221 struct lttng_live_ctf_trace
*trace
= value
;
1222 struct lttng_live_viewer_stream
*stream
;
1223 struct bt_mmap_stream
*new_mmap_stream
;
1224 struct bt_mmap_stream_list mmap_list
;
1225 struct lttng_live_ctx
*ctx
= NULL
;
1226 struct bt_trace_descriptor
*td
;
1227 struct bt_trace_handle
*handle
;
1230 * We don't know how many streams we will receive for a trace, so
1231 * once we are done receiving the traces, we add all the traces
1232 * received to the bt_context.
1233 * We can receive streams during the attach command or the
1234 * get_new_streams, so we have to make sure not to add multiple
1235 * times the same traces.
1236 * If a trace is already in the context, we just skip this function.
1241 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1243 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1244 stream
= g_ptr_array_index(trace
->streams
, i
);
1245 ctx
= stream
->session
->ctx
;
1247 if (!stream
->metadata_flag
) {
1248 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1249 new_mmap_stream
->priv
= (void *) stream
;
1250 new_mmap_stream
->fd
= -1;
1251 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1253 char *metadata_buf
= NULL
;
1255 /* Get all possible metadata before starting */
1256 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1261 if (!stream
->metadata_len
) {
1262 fprintf(stderr
, "[error] empty metadata\n");
1268 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1269 stream
->metadata_len
, "rb");
1270 if (!trace
->metadata_fp
) {
1271 perror("Metadata fmemopen");
1279 if (!trace
->metadata_fp
) {
1280 fprintf(stderr
, "[error] No metadata stream opened\n");
1284 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1285 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1287 fprintf(stderr
, "[error] Error adding trace\n");
1290 trace
->metadata_stream
->metadata_len
= 0;
1292 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1293 bt_ctx
->trace_handles
,
1294 (gpointer
) (unsigned long) ret
);
1296 trace
->handle
= handle
;
1297 if (bt_ctx
->current_iterator
) {
1298 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1301 trace
->trace_id
= ret
;
1307 bt_context_put(bt_ctx
);
1312 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1314 struct lttng_viewer_cmd cmd
;
1315 struct lttng_viewer_new_streams_request rq
;
1316 struct lttng_viewer_new_streams_response rp
;
1317 struct lttng_viewer_stream stream
;
1320 uint32_t stream_count
;
1322 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1323 cmd
.data_size
= sizeof(rq
);
1324 cmd
.cmd_version
= 0;
1326 memset(&rq
, 0, sizeof(rq
));
1327 rq
.session_id
= htobe64(id
);
1329 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1331 perror("[error] Error sending cmd");
1335 assert(ret_len
== sizeof(cmd
));
1337 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
1339 perror("[error] Error sending get_new_streams request");
1343 assert(ret_len
== sizeof(rq
));
1345 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1347 fprintf(stderr
, "[error] Remote side has closed connection\n");
1352 perror("[error] Error receiving get_new_streams response");
1356 assert(ret_len
== sizeof(rp
));
1358 switch(be32toh(rp
.status
)) {
1359 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1361 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1364 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1365 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1367 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1368 fprintf(stderr
, "[error] get_new_streams error\n");
1372 fprintf(stderr
, "[error] Unknown return code %u\n",
1373 be32toh(rp
.status
));
1378 stream_count
= be32toh(rp
.streams_count
);
1379 ctx
->session
->stream_count
+= stream_count
;
1381 * When the session is created but not started, we do an active wait
1382 * until it starts. It allows the viewer to start processing the trace
1383 * as soon as the session starts.
1385 if (ctx
->session
->stream_count
== 0) {
1389 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1390 ctx
->session
->stream_count
);
1391 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1392 ctx
->session
->stream_count
);
1393 for (i
= 0; i
< stream_count
; i
++) {
1394 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
1396 fprintf(stderr
, "[error] Remote side has closed connection\n");
1401 perror("[error] Error receiving stream");
1405 assert(ret_len
== sizeof(stream
));
1406 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1407 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1409 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1410 be64toh(stream
.id
), stream
.path_name
,
1411 stream
.channel_name
);
1412 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1413 ctx
->session
->streams
[i
].session
= ctx
->session
;
1415 ctx
->session
->streams
[i
].first_read
= 1;
1416 ctx
->session
->streams
[i
].mmap_size
= 0;
1418 if (be32toh(stream
.metadata_flag
)) {
1419 ctx
->session
->streams
[i
].metadata_flag
= 1;
1421 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1422 be64toh(stream
.ctf_trace_id
));
1435 void lttng_live_read(struct lttng_live_ctx
*ctx
)
1438 struct bt_ctf_iter
*iter
;
1439 const struct bt_ctf_event
*event
;
1440 struct bt_iter_pos begin_pos
;
1441 struct bt_trace_descriptor
*td_write
;
1442 struct bt_format
*fmt_write
;
1443 struct ctf_text_stream_pos
*sout
;
1446 ctx
->bt_ctx
= bt_context_create();
1448 fprintf(stderr
, "[error] bt_context_create allocation\n");
1452 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1454 fprintf(stderr
, "[error] ctf-text error\n");
1458 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1460 fprintf(stderr
, "[error] Error opening output trace\n");
1464 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1466 if (!sout
->parent
.event_cb
)
1469 ret
= lttng_live_create_viewer_session(ctx
);
1474 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1475 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1476 printf_verbose("Attaching to session %lu\n", id
);
1477 ret
= lttng_live_attach_session(ctx
, id
);
1478 printf_verbose("Attaching session returns %d\n", ret
);
1480 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1481 fprintf(stderr
, "[error] Unknown session ID\n");
1488 * As long as the session is active, we try to get new streams.
1493 while (!ctx
->session
->stream_count
) {
1494 if (ctx
->session_ids
->len
== 0)
1496 ret
= ask_new_streams(ctx
);
1499 if (!ctx
->session
->stream_count
)
1500 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1503 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1506 begin_pos
.type
= BT_SEEK_BEGIN
;
1507 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1509 fprintf(stderr
, "[error] Iterator creation error\n");
1513 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1514 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1519 ret
= sout
->parent
.event_cb(&sout
->parent
,
1520 event
->parent
->stream
);
1522 fprintf(stderr
, "[error] Writing "
1527 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1532 bt_ctf_iter_destroy(iter
);
1533 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1534 del_traces
, ctx
->bt_ctx
);
1535 ctx
->session
->stream_count
= 0;
1539 bt_context_put(ctx
->bt_ctx
);