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 if (lttng_live_should_quit()) {
121 host
= gethostbyname(ctx
->relay_hostname
);
123 fprintf(stderr
, "[error] Cannot lookup hostname %s\n",
124 ctx
->relay_hostname
);
128 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
133 server_addr
.sin_family
= AF_INET
;
134 server_addr
.sin_port
= htons(ctx
->port
);
135 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
136 bzero(&(server_addr
.sin_zero
), 8);
138 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
139 sizeof(struct sockaddr
)) == -1) {
150 fprintf(stderr
, "[error] Connection failed\n");
154 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
156 struct lttng_viewer_cmd cmd
;
157 struct lttng_viewer_connect connect
;
161 if (lttng_live_should_quit()) {
166 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
167 cmd
.data_size
= sizeof(connect
);
170 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
171 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
172 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
173 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
175 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
177 perror("[error] Error sending cmd");
180 assert(ret_len
== sizeof(cmd
));
182 ret_len
= lttng_live_send(ctx
->control_sock
, &connect
, sizeof(connect
));
184 perror("[error] Error sending version");
187 assert(ret_len
== sizeof(connect
));
189 ret_len
= lttng_live_recv(ctx
->control_sock
, &connect
, sizeof(connect
));
191 fprintf(stderr
, "[error] Remote side has closed connection\n");
195 perror("[error] Error receiving version");
198 assert(ret_len
== sizeof(connect
));
200 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
201 be64toh(connect
.viewer_session_id
));
202 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
203 be32toh(connect
.minor
));
205 if (LTTNG_LIVE_MAJOR
!= be32toh(connect
.major
)) {
206 fprintf(stderr
, "[error] Incompatible lttng-relayd protocol\n");
209 /* Use the smallest protocol version implemented. */
210 if (LTTNG_LIVE_MINOR
> be32toh(connect
.minor
)) {
211 ctx
->minor
= be32toh(connect
.minor
);
213 ctx
->minor
= LTTNG_LIVE_MINOR
;
215 ctx
->major
= LTTNG_LIVE_MAJOR
;
221 fprintf(stderr
, "[error] Unable to establish connection\n");
226 void free_session_list(GPtrArray
*session_list
)
229 struct lttng_live_relay_session
*relay_session
;
231 for (i
= 0; i
< session_list
->len
; i
++) {
232 relay_session
= g_ptr_array_index(session_list
, i
);
233 free(relay_session
->name
);
234 free(relay_session
->hostname
);
236 g_ptr_array_free(session_list
, TRUE
);
240 void print_session_list(GPtrArray
*session_list
, const char *path
)
243 struct lttng_live_relay_session
*relay_session
;
245 for (i
= 0; i
< session_list
->len
; i
++) {
246 relay_session
= g_ptr_array_index(session_list
, i
);
247 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
248 "%u stream(s), %u client(s) connected)\n",
249 path
, relay_session
->hostname
,
250 relay_session
->name
, relay_session
->timer
,
251 relay_session
->streams
, relay_session
->clients
);
256 void update_session_list(GPtrArray
*session_list
, char *hostname
,
257 char *session_name
, uint32_t streams
, uint32_t clients
,
261 struct lttng_live_relay_session
*relay_session
;
263 for (i
= 0; i
< session_list
->len
; i
++) {
264 relay_session
= g_ptr_array_index(session_list
, i
);
265 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
266 strncmp(relay_session
->name
,
267 session_name
, NAME_MAX
) == 0) {
268 relay_session
->streams
+= streams
;
269 if (relay_session
->clients
< clients
)
270 relay_session
->clients
= clients
;
278 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
279 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
280 relay_session
->name
= strndup(session_name
, NAME_MAX
);
281 relay_session
->clients
= clients
;
282 relay_session
->streams
= streams
;
283 relay_session
->timer
= timer
;
284 g_ptr_array_add(session_list
, relay_session
);
287 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
289 struct lttng_viewer_cmd cmd
;
290 struct lttng_viewer_list_sessions list
;
291 struct lttng_viewer_session lsession
;
292 int i
, ret
, sessions_count
, print_list
= 0;
295 GPtrArray
*session_list
= NULL
;
297 if (lttng_live_should_quit()) {
302 if (strlen(ctx
->session_name
) == 0) {
304 session_list
= g_ptr_array_new();
307 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
311 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
313 perror("[error] Error sending cmd");
316 assert(ret_len
== sizeof(cmd
));
318 ret_len
= lttng_live_recv(ctx
->control_sock
, &list
, sizeof(list
));
320 fprintf(stderr
, "[error] Remote side has closed connection\n");
324 perror("[error] Error receiving session list");
327 assert(ret_len
== sizeof(list
));
329 sessions_count
= be32toh(list
.sessions_count
);
330 for (i
= 0; i
< sessions_count
; i
++) {
331 ret_len
= lttng_live_recv(ctx
->control_sock
, &lsession
, sizeof(lsession
));
333 fprintf(stderr
, "[error] Remote side has closed connection\n");
337 perror("[error] Error receiving session");
340 assert(ret_len
== sizeof(lsession
));
341 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
342 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
343 session_id
= be64toh(lsession
.id
);
346 update_session_list(session_list
,
348 lsession
.session_name
,
349 be32toh(lsession
.streams
),
350 be32toh(lsession
.clients
),
351 be32toh(lsession
.live_timer
));
353 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
354 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
355 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
356 printf_verbose("Reading from session %" PRIu64
"\n",
358 g_array_append_val(ctx
->session_ids
,
365 print_session_list(session_list
, path
);
366 free_session_list(session_list
);
373 fprintf(stderr
, "[error] Unable to list sessions\n");
377 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
378 uint64_t ctf_trace_id
)
380 struct lttng_live_ctf_trace
*trace
;
383 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
384 (gpointer
) ctf_trace_id
);
386 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
387 trace
->ctf_trace_id
= ctf_trace_id
;
388 trace
->streams
= g_ptr_array_new();
389 g_hash_table_insert(stream
->session
->ctf_traces
,
390 (gpointer
) ctf_trace_id
,
393 if (stream
->metadata_flag
)
394 trace
->metadata_stream
= stream
;
396 stream
->ctf_trace
= trace
;
397 g_ptr_array_add(trace
->streams
, stream
);
403 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
404 char **metadata_buf
, size_t *size
)
408 stream
->metadata_fp_write
=
409 babeltrace_open_memstream(metadata_buf
, size
);
410 if (!stream
->metadata_fp_write
) {
411 perror("Metadata open_memstream");
418 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
420 struct lttng_viewer_cmd cmd
;
421 struct lttng_viewer_attach_session_request rq
;
422 struct lttng_viewer_attach_session_response rp
;
423 struct lttng_viewer_stream stream
;
427 if (lttng_live_should_quit()) {
432 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
433 cmd
.data_size
= sizeof(rq
);
436 memset(&rq
, 0, sizeof(rq
));
437 rq
.session_id
= htobe64(id
);
438 // TODO: add cmd line parameter to select seek beginning
439 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
440 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
442 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
444 perror("[error] Error sending cmd");
447 assert(ret_len
== sizeof(cmd
));
449 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
451 perror("[error] Error sending attach request");
454 assert(ret_len
== sizeof(rq
));
456 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
458 fprintf(stderr
, "[error] Remote side has closed connection\n");
462 perror("[error] Error receiving attach response");
465 assert(ret_len
== sizeof(rp
));
467 switch(be32toh(rp
.status
)) {
468 case LTTNG_VIEWER_ATTACH_OK
:
470 case LTTNG_VIEWER_ATTACH_UNK
:
471 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
473 case LTTNG_VIEWER_ATTACH_ALREADY
:
474 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
476 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
477 fprintf(stderr
, "[error] Not a live session\n");
479 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
480 fprintf(stderr
, "[error] Wrong seek parameter\n");
483 fprintf(stderr
, "[error] Unknown attach return code %u\n",
487 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
491 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
493 * When the session is created but not started, we do an active wait
494 * until it starts. It allows the viewer to start processing the trace
495 * as soon as the session starts.
497 if (ctx
->session
->stream_count
== 0) {
501 printf_verbose("Waiting for %" PRIu64
" streams:\n",
502 ctx
->session
->stream_count
);
503 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
504 ctx
->session
->stream_count
);
505 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
506 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
508 fprintf(stderr
, "[error] Remote side has closed connection\n");
512 perror("[error] Error receiving stream");
515 assert(ret_len
== sizeof(stream
));
516 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
517 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
519 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
520 be64toh(stream
.id
), stream
.path_name
,
521 stream
.channel_name
);
522 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
523 ctx
->session
->streams
[i
].session
= ctx
->session
;
525 ctx
->session
->streams
[i
].first_read
= 1;
526 ctx
->session
->streams
[i
].mmap_size
= 0;
528 if (be32toh(stream
.metadata_flag
)) {
529 ctx
->session
->streams
[i
].metadata_flag
= 1;
531 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
532 be64toh(stream
.ctf_trace_id
));
547 * Ask the relay for new streams.
549 * Returns the number of new streams received or a negative value on error.
552 int ask_new_streams(struct lttng_live_ctx
*ctx
)
554 int i
, ret
= 0, nb_streams
= 0;
558 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
559 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
560 ret
= lttng_live_get_new_streams(ctx
, id
);
561 printf_verbose("Asking for new streams returns %d\n", ret
);
563 if (lttng_live_should_quit()) {
566 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
567 printf_verbose("Session %" PRIu64
" closed\n",
570 * The streams have already been closed during
571 * the reading, so we only need to get rid of
572 * the trace in our internal table of sessions.
574 g_array_remove_index(ctx
->session_ids
, i
);
576 * We can't continue iterating on the g_array
577 * after a remove, we have to start again.
595 int append_metadata(struct lttng_live_ctx
*ctx
,
596 struct lttng_live_viewer_stream
*viewer_stream
)
599 struct lttng_live_viewer_stream
*metadata
;
600 char *metadata_buf
= NULL
;
602 printf_verbose("get_next_index: new metadata needed\n");
603 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
609 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
610 metadata
->ctf_trace
->metadata_fp
=
611 babeltrace_fmemopen(metadata_buf
,
612 metadata
->metadata_len
, "rb");
613 if (!metadata
->ctf_trace
->metadata_fp
) {
614 perror("Metadata fmemopen");
619 ret
= ctf_append_trace_metadata(
620 viewer_stream
->ctf_trace
->handle
->td
,
621 metadata
->ctf_trace
->metadata_fp
);
622 /* We accept empty metadata packets */
623 if (ret
!= 0 && ret
!= -ENOENT
) {
624 fprintf(stderr
, "[error] Appending metadata\n");
634 int get_data_packet(struct lttng_live_ctx
*ctx
,
635 struct ctf_stream_pos
*pos
,
636 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
639 struct lttng_viewer_cmd cmd
;
640 struct lttng_viewer_get_packet rq
;
641 struct lttng_viewer_trace_packet rp
;
646 if (lttng_live_should_quit()) {
650 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
651 cmd
.data_size
= sizeof(rq
);
654 memset(&rq
, 0, sizeof(rq
));
655 rq
.stream_id
= htobe64(stream
->id
);
656 rq
.offset
= htobe64(offset
);
657 rq
.len
= htobe32(len
);
659 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
661 perror("[error] Error sending cmd");
664 assert(ret_len
== sizeof(cmd
));
666 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
668 perror("[error] Error sending get_data_packet request");
671 assert(ret_len
== sizeof(rq
));
673 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
675 fprintf(stderr
, "[error] Remote side has closed connection\n");
679 perror("[error] Error receiving data response");
682 if (ret_len
!= sizeof(rp
)) {
683 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
684 ", received %" PRId64
"\n", sizeof(rp
),
689 rp
.flags
= be32toh(rp
.flags
);
691 switch (be32toh(rp
.status
)) {
692 case LTTNG_VIEWER_GET_PACKET_OK
:
693 len
= be32toh(rp
.len
);
694 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
697 case LTTNG_VIEWER_GET_PACKET_RETRY
:
698 /* Unimplemented by relay daemon */
699 printf_verbose("get_data_packet: retry\n");
701 case LTTNG_VIEWER_GET_PACKET_ERR
:
702 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
703 printf_verbose("get_data_packet: new metadata needed\n");
704 ret
= append_metadata(ctx
, stream
);
708 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
709 printf_verbose("get_data_packet: new streams needed\n");
710 ret
= ask_new_streams(ctx
);
714 g_hash_table_foreach(ctx
->session
->ctf_traces
,
715 add_traces
, ctx
->bt_ctx
);
717 if (rp
.flags
& (LTTNG_VIEWER_FLAG_NEW_METADATA
718 | LTTNG_VIEWER_FLAG_NEW_STREAM
)) {
721 fprintf(stderr
, "[error] get_data_packet: error\n");
723 case LTTNG_VIEWER_GET_PACKET_EOF
:
727 printf_verbose("get_data_packet: unknown\n");
735 if (len
> stream
->mmap_size
) {
738 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
741 ret
= munmap_align(pos
->base_mma
);
743 perror("[error] Unable to unmap old base");
746 pos
->base_mma
= NULL
;
748 pos
->base_mma
= mmap_align(new_size
,
749 PROT_READ
| PROT_WRITE
,
750 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
751 if (pos
->base_mma
== MAP_FAILED
) {
752 perror("[error] mmap error");
753 pos
->base_mma
= NULL
;
757 stream
->mmap_size
= new_size
;
758 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
762 ret_len
= lttng_live_recv(ctx
->control_sock
,
763 mmap_align_addr(pos
->base_mma
), len
);
765 fprintf(stderr
, "[error] Remote side has closed connection\n");
769 perror("[error] Error receiving trace packet");
772 assert(ret_len
== len
);
782 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
783 struct lttng_live_viewer_stream
*metadata_stream
)
787 struct lttng_viewer_cmd cmd
;
788 struct lttng_viewer_get_metadata rq
;
789 struct lttng_viewer_metadata_packet rp
;
793 if (lttng_live_should_quit()) {
798 rq
.stream_id
= htobe64(metadata_stream
->id
);
799 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
800 cmd
.data_size
= sizeof(rq
);
803 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
805 perror("[error] Error sending cmd");
808 assert(ret_len
== sizeof(cmd
));
810 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
812 perror("[error] Error sending get_metadata request");
815 assert(ret_len
== sizeof(rq
));
817 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
819 fprintf(stderr
, "[error] Remote side has closed connection\n");
823 perror("[error] Error receiving metadata response");
826 assert(ret_len
== sizeof(rp
));
828 switch (be32toh(rp
.status
)) {
829 case LTTNG_VIEWER_METADATA_OK
:
830 printf_verbose("get_metadata : OK\n");
832 case LTTNG_VIEWER_NO_NEW_METADATA
:
833 printf_verbose("get_metadata : NO NEW\n");
836 case LTTNG_VIEWER_METADATA_ERR
:
837 printf_verbose("get_metadata : ERR\n");
840 printf_verbose("get_metadata : UNKNOWN\n");
844 len
= be64toh(rp
.len
);
845 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
852 perror("relay data zmalloc");
855 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
857 fprintf(stderr
, "[error] Remote side has closed connection\n");
858 goto error_free_data
;
861 perror("[error] Error receiving trace packet");
862 goto error_free_data
;
864 assert(ret_len
== len
);
867 ret_len
= fwrite(data
, 1, len
,
868 metadata_stream
->metadata_fp_write
);
869 } while (ret_len
< 0 && errno
== EINTR
);
871 fprintf(stderr
, "[error] Writing in the metadata fp\n");
872 goto error_free_data
;
874 assert(ret_len
== len
);
875 metadata_stream
->metadata_len
+= len
;
888 * Return 0 on success, a negative value on error.
891 int get_new_metadata(struct lttng_live_ctx
*ctx
,
892 struct lttng_live_viewer_stream
*viewer_stream
,
896 struct lttng_live_viewer_stream
*metadata_stream
;
897 size_t size
, len_read
= 0;
899 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
900 if (!metadata_stream
) {
901 fprintf(stderr
, "[error] No metadata stream\n");
905 metadata_stream
->metadata_len
= 0;
906 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
913 * get_one_metadata_packet returns the number of bytes
914 * received, 0 when we have received everything, a
915 * negative value on error.
917 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
922 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
924 } while (ret
> 0 || !len_read
);
926 if (fclose(metadata_stream
->metadata_fp_write
))
928 metadata_stream
->metadata_fp_write
= NULL
;
935 * Get one index for a stream.
937 * Returns 0 on success or a negative value on error.
940 int get_next_index(struct lttng_live_ctx
*ctx
,
941 struct lttng_live_viewer_stream
*viewer_stream
,
942 struct packet_index
*index
)
944 struct lttng_viewer_cmd cmd
;
945 struct lttng_viewer_get_next_index rq
;
946 struct lttng_viewer_index rp
;
950 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
951 cmd
.data_size
= sizeof(rq
);
954 memset(&rq
, 0, sizeof(rq
));
955 rq
.stream_id
= htobe64(viewer_stream
->id
);
958 if (lttng_live_should_quit()) {
962 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
964 perror("[error] Error sending cmd");
967 assert(ret_len
== sizeof(cmd
));
969 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
971 perror("[error] Error sending get_next_index request");
974 assert(ret_len
== sizeof(rq
));
976 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
978 fprintf(stderr
, "[error] Remote side has closed connection\n");
982 perror("[error] Error receiving index response");
985 assert(ret_len
== sizeof(rp
));
987 rp
.flags
= be32toh(rp
.flags
);
989 switch (be32toh(rp
.status
)) {
990 case LTTNG_VIEWER_INDEX_INACTIVE
:
991 printf_verbose("get_next_index: inactive\n");
992 memset(index
, 0, sizeof(struct packet_index
));
993 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
995 case LTTNG_VIEWER_INDEX_OK
:
996 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
997 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
998 index
->offset
= be64toh(rp
.offset
);
999 index
->packet_size
= be64toh(rp
.packet_size
);
1000 index
->content_size
= be64toh(rp
.content_size
);
1001 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
1002 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
1003 index
->events_discarded
= be64toh(rp
.events_discarded
);
1005 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
1006 ret
= append_metadata(ctx
, viewer_stream
);
1010 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
1011 printf_verbose("get_next_index: need new streams\n");
1012 ret
= ask_new_streams(ctx
);
1016 g_hash_table_foreach(ctx
->session
->ctf_traces
,
1017 add_traces
, ctx
->bt_ctx
);
1020 case LTTNG_VIEWER_INDEX_RETRY
:
1021 printf_verbose("get_next_index: retry\n");
1022 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1024 case LTTNG_VIEWER_INDEX_HUP
:
1025 printf_verbose("get_next_index: stream hung up\n");
1026 viewer_stream
->id
= -1ULL;
1027 index
->offset
= EOF
;
1028 ctx
->session
->stream_count
--;
1030 case LTTNG_VIEWER_INDEX_ERR
:
1031 fprintf(stderr
, "[error] get_next_index: error\n");
1034 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1046 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1049 struct ctf_stream_pos
*pos
;
1050 struct ctf_file_stream
*file_stream
;
1051 struct packet_index
*prev_index
= NULL
, *cur_index
;
1052 struct lttng_live_viewer_stream
*viewer_stream
;
1053 struct lttng_live_session
*session
;
1057 pos
= ctf_pos(stream_pos
);
1058 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1059 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1060 session
= viewer_stream
->session
;
1062 switch (pos
->packet_index
->len
) {
1064 g_array_set_size(pos
->packet_index
, 1);
1065 cur_index
= &g_array_index(pos
->packet_index
,
1066 struct packet_index
, 0);
1069 g_array_set_size(pos
->packet_index
, 2);
1070 prev_index
= &g_array_index(pos
->packet_index
,
1071 struct packet_index
, 0);
1072 cur_index
= &g_array_index(pos
->packet_index
,
1073 struct packet_index
, 1);
1076 g_array_index(pos
->packet_index
,
1077 struct packet_index
, 0) =
1078 g_array_index(pos
->packet_index
,
1079 struct packet_index
, 1);
1080 prev_index
= &g_array_index(pos
->packet_index
,
1081 struct packet_index
, 0);
1082 cur_index
= &g_array_index(pos
->packet_index
,
1083 struct packet_index
, 1);
1089 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1090 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1093 if (!lttng_live_should_quit()) {
1094 fprintf(stderr
, "[error] get_next_index failed\n");
1099 pos
->packet_size
= cur_index
->packet_size
;
1100 pos
->content_size
= cur_index
->content_size
;
1101 pos
->mmap_base_offset
= 0;
1102 if (cur_index
->offset
== EOF
) {
1108 if (cur_index
->content_size
== 0) {
1109 file_stream
->parent
.cycles_timestamp
=
1110 cur_index
->ts_cycles
.timestamp_end
;
1111 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1112 &file_stream
->parent
,
1113 cur_index
->ts_cycles
.timestamp_end
);
1115 /* Convert the timestamps and append to the real_index. */
1116 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1117 &file_stream
->parent
,
1118 cur_index
->ts_cycles
.timestamp_begin
);
1119 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1120 &file_stream
->parent
,
1121 cur_index
->ts_cycles
.timestamp_end
);
1123 ctf_update_current_packet_index(&file_stream
->parent
,
1124 prev_index
, cur_index
);
1126 file_stream
->parent
.cycles_timestamp
=
1127 cur_index
->ts_cycles
.timestamp_begin
;
1128 file_stream
->parent
.real_timestamp
=
1129 cur_index
->ts_real
.timestamp_begin
;
1132 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1136 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1138 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1140 cur_index
->packet_size
/ CHAR_BIT
);
1143 } else if (ret
< 0) {
1145 if (!lttng_live_should_quit()) {
1146 fprintf(stderr
, "[error] get_data_packet failed\n");
1151 printf_verbose("Index received : packet_size : %" PRIu64
1152 ", offset %" PRIu64
", content_size %" PRIu64
1153 ", timestamp_end : %" PRIu64
"\n",
1154 cur_index
->packet_size
, cur_index
->offset
,
1155 cur_index
->content_size
,
1156 cur_index
->ts_cycles
.timestamp_end
);
1158 /* update trace_packet_header and stream_packet_context */
1159 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1160 /* Read packet header */
1161 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1164 fprintf(stderr
, "[error] trace packet header read failed\n");
1168 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1169 /* Read packet context */
1170 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1173 fprintf(stderr
, "[error] stream packet context read failed\n");
1177 pos
->data_offset
= pos
->offset
;
1183 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1185 struct lttng_viewer_cmd cmd
;
1186 struct lttng_viewer_create_session_response resp
;
1190 if (lttng_live_should_quit()) {
1195 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1197 cmd
.cmd_version
= 0;
1199 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1201 perror("[error] Error sending cmd");
1204 assert(ret_len
== sizeof(cmd
));
1206 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1208 fprintf(stderr
, "[error] Remote side has closed connection\n");
1212 perror("[error] Error receiving create session reply");
1215 assert(ret_len
== sizeof(resp
));
1217 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1218 fprintf(stderr
, "[error] Error creating viewer session\n");
1230 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1232 struct bt_context
*bt_ctx
= user_data
;
1233 struct lttng_live_ctf_trace
*trace
= value
;
1236 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1238 fprintf(stderr
, "[error] removing trace from context\n");
1240 /* remove the key/value pair from the HT. */
1245 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1248 struct bt_context
*bt_ctx
= user_data
;
1249 struct lttng_live_ctf_trace
*trace
= value
;
1250 struct lttng_live_viewer_stream
*stream
;
1251 struct bt_mmap_stream
*new_mmap_stream
;
1252 struct bt_mmap_stream_list mmap_list
;
1253 struct lttng_live_ctx
*ctx
= NULL
;
1254 struct bt_trace_descriptor
*td
;
1255 struct bt_trace_handle
*handle
;
1258 * We don't know how many streams we will receive for a trace, so
1259 * once we are done receiving the traces, we add all the traces
1260 * received to the bt_context.
1261 * We can receive streams during the attach command or the
1262 * get_new_streams, so we have to make sure not to add multiple
1263 * times the same traces.
1264 * If a trace is already in the context, we just skip this function.
1269 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1271 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1272 stream
= g_ptr_array_index(trace
->streams
, i
);
1273 ctx
= stream
->session
->ctx
;
1275 if (!stream
->metadata_flag
) {
1276 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1277 new_mmap_stream
->priv
= (void *) stream
;
1278 new_mmap_stream
->fd
= -1;
1279 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1281 char *metadata_buf
= NULL
;
1283 /* Get all possible metadata before starting */
1284 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1289 if (!stream
->metadata_len
) {
1290 fprintf(stderr
, "[error] empty metadata\n");
1296 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1297 stream
->metadata_len
, "rb");
1298 if (!trace
->metadata_fp
) {
1299 perror("Metadata fmemopen");
1307 if (!trace
->metadata_fp
) {
1308 fprintf(stderr
, "[error] No metadata stream opened\n");
1312 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1313 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1315 fprintf(stderr
, "[error] Error adding trace\n");
1318 trace
->metadata_stream
->metadata_len
= 0;
1320 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1321 bt_ctx
->trace_handles
,
1322 (gpointer
) (unsigned long) ret
);
1324 trace
->handle
= handle
;
1325 if (bt_ctx
->current_iterator
) {
1326 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1329 trace
->trace_id
= ret
;
1335 bt_context_put(bt_ctx
);
1341 * Request new streams for a session.
1342 * Returns the number of streams received or a negative value on error.
1344 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1346 struct lttng_viewer_cmd cmd
;
1347 struct lttng_viewer_new_streams_request rq
;
1348 struct lttng_viewer_new_streams_response rp
;
1349 struct lttng_viewer_stream stream
;
1350 int ret
, i
, nb_streams
= 0;
1352 uint32_t stream_count
;
1354 if (lttng_live_should_quit()) {
1359 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1360 cmd
.data_size
= sizeof(rq
);
1361 cmd
.cmd_version
= 0;
1363 memset(&rq
, 0, sizeof(rq
));
1364 rq
.session_id
= htobe64(id
);
1366 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1368 perror("[error] Error sending cmd");
1371 assert(ret_len
== sizeof(cmd
));
1373 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
1375 perror("[error] Error sending get_new_streams request");
1378 assert(ret_len
== sizeof(rq
));
1380 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1382 fprintf(stderr
, "[error] Remote side has closed connection\n");
1386 perror("[error] Error receiving get_new_streams response");
1389 assert(ret_len
== sizeof(rp
));
1391 switch(be32toh(rp
.status
)) {
1392 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1394 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1397 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1398 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1400 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1401 fprintf(stderr
, "[error] get_new_streams error\n");
1404 fprintf(stderr
, "[error] Unknown return code %u\n",
1405 be32toh(rp
.status
));
1409 stream_count
= be32toh(rp
.streams_count
);
1410 ctx
->session
->stream_count
+= stream_count
;
1412 * When the session is created but not started, we do an active wait
1413 * until it starts. It allows the viewer to start processing the trace
1414 * as soon as the session starts.
1416 if (ctx
->session
->stream_count
== 0) {
1420 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1421 ctx
->session
->stream_count
);
1422 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1423 ctx
->session
->stream_count
);
1424 for (i
= 0; i
< stream_count
; i
++) {
1425 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
1427 fprintf(stderr
, "[error] Remote side has closed connection\n");
1431 perror("[error] Error receiving stream");
1434 assert(ret_len
== sizeof(stream
));
1435 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1436 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1438 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1439 be64toh(stream
.id
), stream
.path_name
,
1440 stream
.channel_name
);
1441 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1442 ctx
->session
->streams
[i
].session
= ctx
->session
;
1444 ctx
->session
->streams
[i
].first_read
= 1;
1445 ctx
->session
->streams
[i
].mmap_size
= 0;
1447 if (be32toh(stream
.metadata_flag
)) {
1448 ctx
->session
->streams
[i
].metadata_flag
= 1;
1450 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1451 be64toh(stream
.ctf_trace_id
));
1466 int lttng_live_read(struct lttng_live_ctx
*ctx
)
1470 struct bt_ctf_iter
*iter
;
1471 const struct bt_ctf_event
*event
;
1472 struct bt_iter_pos begin_pos
;
1473 struct bt_trace_descriptor
*td_write
;
1474 struct bt_format
*fmt_write
;
1475 struct ctf_text_stream_pos
*sout
;
1478 ctx
->bt_ctx
= bt_context_create();
1480 fprintf(stderr
, "[error] bt_context_create allocation\n");
1484 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1486 fprintf(stderr
, "[error] ctf-text error\n");
1490 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1492 fprintf(stderr
, "[error] Error opening output trace\n");
1496 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1498 if (!sout
->parent
.event_cb
) {
1502 ret
= lttng_live_create_viewer_session(ctx
);
1507 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1508 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1509 printf_verbose("Attaching to session %lu\n", id
);
1510 ret
= lttng_live_attach_session(ctx
, id
);
1511 printf_verbose("Attaching session returns %d\n", ret
);
1513 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1514 fprintf(stderr
, "[error] Unknown session ID\n");
1521 * As long as the session is active, we try to get new streams.
1526 if (lttng_live_should_quit()) {
1531 while (!ctx
->session
->stream_count
) {
1532 if (lttng_live_should_quit()
1533 || ctx
->session_ids
->len
== 0) {
1537 ret
= ask_new_streams(ctx
);
1541 if (!ctx
->session
->stream_count
) {
1542 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1546 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1549 begin_pos
.type
= BT_SEEK_BEGIN
;
1550 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1552 if (lttng_live_should_quit()) {
1556 fprintf(stderr
, "[error] Iterator creation error\n");
1560 if (lttng_live_should_quit()) {
1564 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1565 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1570 ret
= sout
->parent
.event_cb(&sout
->parent
,
1571 event
->parent
->stream
);
1573 fprintf(stderr
, "[error] Writing "
1578 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1583 bt_ctf_iter_destroy(iter
);
1584 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1585 del_traces
, ctx
->bt_ctx
);
1586 ctx
->session
->stream_count
= 0;
1590 bt_context_put(ctx
->bt_ctx
);
1592 if (lttng_live_should_quit()) {