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
,
75 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
78 struct sockaddr_in server_addr
;
81 host
= gethostbyname(ctx
->relay_hostname
);
87 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
93 server_addr
.sin_family
= AF_INET
;
94 server_addr
.sin_port
= htons(ctx
->port
);
95 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
96 bzero(&(server_addr
.sin_zero
), 8);
98 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
99 sizeof(struct sockaddr
)) == -1) {
111 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
113 struct lttng_viewer_cmd cmd
;
114 struct lttng_viewer_connect connect
;
118 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
119 cmd
.data_size
= sizeof(connect
);
122 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
123 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
124 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
125 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
128 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
129 } while (ret_len
< 0 && errno
== EINTR
);
131 perror("[error] Error sending cmd");
135 assert(ret_len
== sizeof(cmd
));
138 ret_len
= send(ctx
->control_sock
, &connect
, sizeof(connect
), 0);
139 } while (ret_len
< 0 && errno
== EINTR
);
141 perror("[error] Error sending version");
145 assert(ret_len
== sizeof(connect
));
148 ret_len
= recv(ctx
->control_sock
, &connect
, sizeof(connect
), 0);
149 } while (ret_len
< 0 && errno
== EINTR
);
151 fprintf(stderr
, "[error] Remote side has closed connection\n");
156 perror("[error] Error receiving version");
160 assert(ret_len
== sizeof(connect
));
162 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
163 be64toh(connect
.viewer_session_id
));
164 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
165 be32toh(connect
.minor
));
174 void free_session_list(GPtrArray
*session_list
)
177 struct lttng_live_relay_session
*relay_session
;
179 for (i
= 0; i
< session_list
->len
; i
++) {
180 relay_session
= g_ptr_array_index(session_list
, i
);
181 free(relay_session
->name
);
182 free(relay_session
->hostname
);
184 g_ptr_array_free(session_list
, TRUE
);
188 void print_session_list(GPtrArray
*session_list
, const char *path
)
191 struct lttng_live_relay_session
*relay_session
;
193 for (i
= 0; i
< session_list
->len
; i
++) {
194 relay_session
= g_ptr_array_index(session_list
, i
);
195 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
196 "%u stream(s), %u client(s) connected)\n",
197 path
, relay_session
->hostname
,
198 relay_session
->name
, relay_session
->timer
,
199 relay_session
->streams
, relay_session
->clients
);
204 void update_session_list(GPtrArray
*session_list
, char *hostname
,
205 char *session_name
, uint32_t streams
, uint32_t clients
,
209 struct lttng_live_relay_session
*relay_session
;
211 for (i
= 0; i
< session_list
->len
; i
++) {
212 relay_session
= g_ptr_array_index(session_list
, i
);
213 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
214 strncmp(relay_session
->name
,
215 session_name
, NAME_MAX
) == 0) {
216 relay_session
->streams
+= streams
;
217 if (relay_session
->clients
< clients
)
218 relay_session
->clients
= clients
;
226 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
227 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
228 relay_session
->name
= strndup(session_name
, NAME_MAX
);
229 relay_session
->clients
= clients
;
230 relay_session
->streams
= streams
;
231 relay_session
->timer
= timer
;
232 g_ptr_array_add(session_list
, relay_session
);
235 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
237 struct lttng_viewer_cmd cmd
;
238 struct lttng_viewer_list_sessions list
;
239 struct lttng_viewer_session lsession
;
240 int i
, ret
, sessions_count
, print_list
= 0;
243 GPtrArray
*session_list
= NULL
;
245 if (strlen(ctx
->session_name
) == 0) {
247 session_list
= g_ptr_array_new();
250 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
255 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
256 } while (ret_len
< 0 && errno
== EINTR
);
258 perror("[error] Error sending cmd");
262 assert(ret_len
== sizeof(cmd
));
265 ret_len
= recv(ctx
->control_sock
, &list
, sizeof(list
), 0);
266 } while (ret_len
< 0 && errno
== EINTR
);
268 fprintf(stderr
, "[error] Remote side has closed connection\n");
273 perror("[error] Error receiving session list");
277 assert(ret_len
== sizeof(list
));
279 sessions_count
= be32toh(list
.sessions_count
);
280 for (i
= 0; i
< sessions_count
; i
++) {
282 ret_len
= recv(ctx
->control_sock
, &lsession
, sizeof(lsession
), 0);
283 } while (ret_len
< 0 && errno
== EINTR
);
285 fprintf(stderr
, "[error] Remote side has closed connection\n");
290 perror("[error] Error receiving session");
294 assert(ret_len
== sizeof(lsession
));
295 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
296 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
297 session_id
= be64toh(lsession
.id
);
300 update_session_list(session_list
,
302 lsession
.session_name
,
303 be32toh(lsession
.streams
),
304 be32toh(lsession
.clients
),
305 be32toh(lsession
.live_timer
));
307 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
308 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
309 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
310 printf_verbose("Reading from session %" PRIu64
"\n",
312 g_array_append_val(ctx
->session_ids
,
319 print_session_list(session_list
, path
);
320 free_session_list(session_list
);
329 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
330 uint64_t ctf_trace_id
)
332 struct lttng_live_ctf_trace
*trace
;
335 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
336 (gpointer
) ctf_trace_id
);
338 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
339 trace
->ctf_trace_id
= ctf_trace_id
;
340 trace
->streams
= g_ptr_array_new();
341 g_hash_table_insert(stream
->session
->ctf_traces
,
342 (gpointer
) ctf_trace_id
,
345 if (stream
->metadata_flag
)
346 trace
->metadata_stream
= stream
;
348 stream
->ctf_trace
= trace
;
349 g_ptr_array_add(trace
->streams
, stream
);
355 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
356 char **metadata_buf
, size_t *size
)
360 stream
->metadata_fp_write
=
361 babeltrace_open_memstream(metadata_buf
, size
);
362 if (!stream
->metadata_fp_write
) {
363 perror("Metadata open_memstream");
370 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
372 struct lttng_viewer_cmd cmd
;
373 struct lttng_viewer_attach_session_request rq
;
374 struct lttng_viewer_attach_session_response rp
;
375 struct lttng_viewer_stream stream
;
379 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
380 cmd
.data_size
= sizeof(rq
);
383 memset(&rq
, 0, sizeof(rq
));
384 rq
.session_id
= htobe64(id
);
385 // TODO: add cmd line parameter to select seek beginning
386 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
387 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
390 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
391 } while (ret_len
< 0 && errno
== EINTR
);
393 perror("[error] Error sending cmd");
397 assert(ret_len
== sizeof(cmd
));
400 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
401 } while (ret_len
< 0 && errno
== EINTR
);
403 perror("[error] Error sending attach request");
407 assert(ret_len
== sizeof(rq
));
410 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
411 } while (ret_len
< 0 && errno
== EINTR
);
413 fprintf(stderr
, "[error] Remote side has closed connection\n");
418 perror("[error] Error receiving attach response");
422 assert(ret_len
== sizeof(rp
));
424 switch(be32toh(rp
.status
)) {
425 case LTTNG_VIEWER_ATTACH_OK
:
427 case LTTNG_VIEWER_ATTACH_UNK
:
428 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
430 case LTTNG_VIEWER_ATTACH_ALREADY
:
431 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
434 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
435 fprintf(stderr
, "[error] Not a live session\n");
438 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
439 fprintf(stderr
, "[error] Wrong seek parameter\n");
443 fprintf(stderr
, "[error] Unknown attach return code %u\n",
448 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
453 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
455 * When the session is created but not started, we do an active wait
456 * until it starts. It allows the viewer to start processing the trace
457 * as soon as the session starts.
459 if (ctx
->session
->stream_count
== 0) {
463 printf_verbose("Waiting for %" PRIu64
" streams:\n",
464 ctx
->session
->stream_count
);
465 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
466 ctx
->session
->stream_count
);
467 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
469 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
470 } while (ret_len
< 0 && errno
== EINTR
);
472 fprintf(stderr
, "[error] Remote side has closed connection\n");
477 perror("[error] Error receiving stream");
481 assert(ret_len
== sizeof(stream
));
482 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
483 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
485 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
486 be64toh(stream
.id
), stream
.path_name
,
487 stream
.channel_name
);
488 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
489 ctx
->session
->streams
[i
].session
= ctx
->session
;
491 ctx
->session
->streams
[i
].first_read
= 1;
492 ctx
->session
->streams
[i
].mmap_size
= 0;
494 if (be32toh(stream
.metadata_flag
)) {
495 ctx
->session
->streams
[i
].metadata_flag
= 1;
497 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
498 be64toh(stream
.ctf_trace_id
));
512 int ask_new_streams(struct lttng_live_ctx
*ctx
)
518 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
519 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
520 ret
= lttng_live_get_new_streams(ctx
, id
);
521 printf_verbose("Asking for new streams returns %d\n",
524 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
525 printf_verbose("Session %" PRIu64
" closed\n",
528 * The streams have already been closed during
529 * the reading, so we only need to get rid of
530 * the trace in our internal table of sessions.
532 g_array_remove_index(ctx
->session_ids
, i
);
534 * We can't continue iterating on the g_array
535 * after a remove, we have to start again.
550 int append_metadata(struct lttng_live_ctx
*ctx
,
551 struct lttng_live_viewer_stream
*viewer_stream
)
554 struct lttng_live_viewer_stream
*metadata
;
555 char *metadata_buf
= NULL
;
557 printf_verbose("get_next_index: new metadata needed\n");
558 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
564 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
565 metadata
->ctf_trace
->metadata_fp
=
566 babeltrace_fmemopen(metadata_buf
,
567 metadata
->metadata_len
, "rb");
568 if (!metadata
->ctf_trace
->metadata_fp
) {
569 perror("Metadata fmemopen");
574 ret
= ctf_append_trace_metadata(
575 viewer_stream
->ctf_trace
->handle
->td
,
576 metadata
->ctf_trace
->metadata_fp
);
578 fprintf(stderr
, "[error] Appending metadata\n");
587 int get_data_packet(struct lttng_live_ctx
*ctx
,
588 struct ctf_stream_pos
*pos
,
589 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
592 struct lttng_viewer_cmd cmd
;
593 struct lttng_viewer_get_packet rq
;
594 struct lttng_viewer_trace_packet rp
;
599 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
600 cmd
.data_size
= sizeof(rq
);
603 memset(&rq
, 0, sizeof(rq
));
604 rq
.stream_id
= htobe64(stream
->id
);
605 /* Already in big endian. */
607 rq
.len
= htobe32(len
);
610 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
611 } while (ret_len
< 0 && errno
== EINTR
);
613 perror("[error] Error sending cmd");
617 assert(ret_len
== sizeof(cmd
));
620 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
621 } while (ret_len
< 0 && errno
== EINTR
);
623 perror("[error] Error sending get_data_packet request");
627 assert(ret_len
== sizeof(rq
));
630 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
631 } while (ret_len
< 0 && errno
== EINTR
);
633 fprintf(stderr
, "[error] Remote side has closed connection\n");
638 perror("[error] Error receiving data response");
642 if (ret_len
!= sizeof(rp
)) {
643 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
644 ", received %" PRId64
"\n", ret_len
,
650 rp
.flags
= be32toh(rp
.flags
);
652 switch (be32toh(rp
.status
)) {
653 case LTTNG_VIEWER_GET_PACKET_OK
:
654 len
= be32toh(rp
.len
);
655 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
658 case LTTNG_VIEWER_GET_PACKET_RETRY
:
659 printf_verbose("get_data_packet: retry\n");
662 case LTTNG_VIEWER_GET_PACKET_ERR
:
663 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
664 printf_verbose("get_data_packet: new metadata needed\n");
665 ret
= append_metadata(ctx
, stream
);
670 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
671 ret
= ask_new_streams(ctx
);
674 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
677 fprintf(stderr
, "[error] get_data_packet: error\n");
680 case LTTNG_VIEWER_GET_PACKET_EOF
:
684 printf_verbose("get_data_packet: unknown\n");
695 if (len
> stream
->mmap_size
) {
698 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
701 ret
= munmap_align(pos
->base_mma
);
703 perror("[error] Unable to unmap old base");
707 pos
->base_mma
= NULL
;
709 pos
->base_mma
= mmap_align(new_size
,
710 PROT_READ
| PROT_WRITE
,
711 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
712 if (pos
->base_mma
== MAP_FAILED
) {
713 perror("[error] mmap error");
714 pos
->base_mma
= NULL
;
719 stream
->mmap_size
= new_size
;
720 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
725 ret_len
= recv(ctx
->control_sock
,
726 mmap_align_addr(pos
->base_mma
), len
,
728 } while (ret_len
< 0 && errno
== EINTR
);
730 fprintf(stderr
, "[error] Remote side has closed connection\n");
735 perror("[error] Error receiving trace packet");
739 assert(ret_len
== len
);
747 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
748 struct lttng_live_viewer_stream
*metadata_stream
)
752 struct lttng_viewer_cmd cmd
;
753 struct lttng_viewer_get_metadata rq
;
754 struct lttng_viewer_metadata_packet rp
;
758 rq
.stream_id
= htobe64(metadata_stream
->id
);
759 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
760 cmd
.data_size
= sizeof(rq
);
764 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
765 } while (ret_len
< 0 && errno
== EINTR
);
767 perror("[error] Error sending cmd");
771 assert(ret_len
== sizeof(cmd
));
774 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
775 } while (ret_len
< 0 && errno
== EINTR
);
777 perror("[error] Error sending get_metadata request");
781 assert(ret_len
== sizeof(rq
));
784 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
785 } while (ret_len
< 0 && errno
== EINTR
);
787 fprintf(stderr
, "[error] Remote side has closed connection\n");
792 perror("[error] Error receiving metadata response");
796 assert(ret_len
== sizeof(rp
));
798 switch (be32toh(rp
.status
)) {
799 case LTTNG_VIEWER_METADATA_OK
:
800 printf_verbose("get_metadata : OK\n");
802 case LTTNG_VIEWER_NO_NEW_METADATA
:
803 printf_verbose("get_metadata : NO NEW\n");
806 case LTTNG_VIEWER_METADATA_ERR
:
807 printf_verbose("get_metadata : ERR\n");
811 printf_verbose("get_metadata : UNKNOWN\n");
816 len
= be64toh(rp
.len
);
817 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
825 perror("relay data zmalloc");
830 ret_len
= recv(ctx
->control_sock
, data
, len
, MSG_WAITALL
);
831 } while (ret_len
< 0 && errno
== EINTR
);
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
;
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
);
900 fclose(metadata_stream
->metadata_fp_write
);
901 metadata_stream
->metadata_fp_write
= NULL
;
908 * Get one index for a stream.
910 * Returns 0 on success or a negative value on error.
913 int get_next_index(struct lttng_live_ctx
*ctx
,
914 struct lttng_live_viewer_stream
*viewer_stream
,
915 struct packet_index
*index
)
917 struct lttng_viewer_cmd cmd
;
918 struct lttng_viewer_get_next_index rq
;
919 struct lttng_viewer_index rp
;
923 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
924 cmd
.data_size
= sizeof(rq
);
927 memset(&rq
, 0, sizeof(rq
));
928 rq
.stream_id
= htobe64(viewer_stream
->id
);
932 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
933 } while (ret_len
< 0 && errno
== EINTR
);
935 perror("[error] Error sending cmd");
939 assert(ret_len
== sizeof(cmd
));
942 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
943 } while (ret_len
< 0 && errno
== EINTR
);
945 perror("[error] Error sending get_next_index request");
949 assert(ret_len
== sizeof(rq
));
952 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
953 } while (ret_len
< 0 && errno
== EINTR
);
955 fprintf(stderr
, "[error] Remote side has closed connection\n");
960 perror("[error] Error receiving index response");
964 assert(ret_len
== sizeof(rp
));
966 rp
.flags
= be32toh(rp
.flags
);
968 switch (be32toh(rp
.status
)) {
969 case LTTNG_VIEWER_INDEX_INACTIVE
:
970 printf_verbose("get_next_index: inactive\n");
971 memset(index
, 0, sizeof(struct packet_index
));
972 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
974 case LTTNG_VIEWER_INDEX_OK
:
975 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
976 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
977 index
->offset
= be64toh(rp
.offset
);
978 index
->packet_size
= be64toh(rp
.packet_size
);
979 index
->content_size
= be64toh(rp
.content_size
);
980 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
981 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
982 index
->events_discarded
= be64toh(rp
.events_discarded
);
984 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
985 ret
= append_metadata(ctx
, viewer_stream
);
989 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
990 ret
= ask_new_streams(ctx
);
993 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
997 case LTTNG_VIEWER_INDEX_RETRY
:
998 printf_verbose("get_next_index: retry\n");
1001 case LTTNG_VIEWER_INDEX_HUP
:
1002 printf_verbose("get_next_index: stream hung up\n");
1003 viewer_stream
->id
= -1ULL;
1004 index
->offset
= EOF
;
1005 ctx
->session
->stream_count
--;
1007 case LTTNG_VIEWER_INDEX_ERR
:
1008 fprintf(stderr
, "[error] get_next_index: error\n");
1012 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1024 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1027 struct ctf_stream_pos
*pos
;
1028 struct ctf_file_stream
*file_stream
;
1029 struct packet_index
*prev_index
= NULL
, *cur_index
;
1030 struct lttng_live_viewer_stream
*viewer_stream
;
1031 struct lttng_live_session
*session
;
1035 pos
= ctf_pos(stream_pos
);
1036 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1037 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1038 session
= viewer_stream
->session
;
1040 switch (pos
->packet_index
->len
) {
1042 g_array_set_size(pos
->packet_index
, 1);
1043 cur_index
= &g_array_index(pos
->packet_index
,
1044 struct packet_index
, 0);
1047 g_array_set_size(pos
->packet_index
, 2);
1048 prev_index
= &g_array_index(pos
->packet_index
,
1049 struct packet_index
, 0);
1050 cur_index
= &g_array_index(pos
->packet_index
,
1051 struct packet_index
, 1);
1054 g_array_index(pos
->packet_index
,
1055 struct packet_index
, 0) =
1056 g_array_index(pos
->packet_index
,
1057 struct packet_index
, 1);
1058 prev_index
= &g_array_index(pos
->packet_index
,
1059 struct packet_index
, 0);
1060 cur_index
= &g_array_index(pos
->packet_index
,
1061 struct packet_index
, 1);
1067 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1068 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1071 fprintf(stderr
, "[error] get_next_index failed\n");
1075 pos
->packet_size
= cur_index
->packet_size
;
1076 pos
->content_size
= cur_index
->content_size
;
1077 pos
->mmap_base_offset
= 0;
1078 if (cur_index
->offset
== EOF
) {
1084 if (cur_index
->content_size
== 0) {
1085 file_stream
->parent
.cycles_timestamp
=
1086 cur_index
->ts_cycles
.timestamp_end
;
1087 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1088 &file_stream
->parent
,
1089 cur_index
->ts_cycles
.timestamp_end
);
1091 /* Convert the timestamps and append to the real_index. */
1092 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1093 &file_stream
->parent
,
1094 cur_index
->ts_cycles
.timestamp_begin
);
1095 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1096 &file_stream
->parent
,
1097 cur_index
->ts_cycles
.timestamp_end
);
1099 ctf_update_current_packet_index(&file_stream
->parent
,
1100 prev_index
, cur_index
);
1102 file_stream
->parent
.cycles_timestamp
=
1103 cur_index
->ts_cycles
.timestamp_begin
;
1104 file_stream
->parent
.real_timestamp
=
1105 cur_index
->ts_real
.timestamp_begin
;
1108 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1112 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1114 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1115 be64toh(cur_index
->offset
),
1116 cur_index
->packet_size
/ CHAR_BIT
);
1119 } else if (ret
< 0) {
1121 fprintf(stderr
, "[error] get_data_packet failed\n");
1125 printf_verbose("Index received : packet_size : %" PRIu64
1126 ", offset %" PRIu64
", content_size %" PRIu64
1127 ", timestamp_end : %" PRIu64
"\n",
1128 cur_index
->packet_size
, cur_index
->offset
,
1129 cur_index
->content_size
,
1130 cur_index
->ts_cycles
.timestamp_end
);
1132 /* update trace_packet_header and stream_packet_context */
1133 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1134 /* Read packet header */
1135 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1138 fprintf(stderr
, "[error] trace packet header read failed\n");
1142 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1143 /* Read packet context */
1144 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1147 fprintf(stderr
, "[error] stream packet context read failed\n");
1151 pos
->data_offset
= pos
->offset
;
1157 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1159 struct lttng_viewer_cmd cmd
;
1160 struct lttng_viewer_create_session_response resp
;
1164 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1166 cmd
.cmd_version
= 0;
1169 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1170 } while (ret_len
< 0 && errno
== EINTR
);
1172 perror("[error] Error sending cmd");
1176 assert(ret_len
== sizeof(cmd
));
1179 ret_len
= recv(ctx
->control_sock
, &resp
, sizeof(resp
), 0);
1180 } while (ret_len
< 0 && errno
== EINTR
);
1182 fprintf(stderr
, "[error] Remote side has closed connection\n");
1187 perror("[error] Error receiving create session reply");
1191 assert(ret_len
== sizeof(resp
));
1193 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1194 fprintf(stderr
, "[error] Error creating viewer session\n");
1205 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1207 struct bt_context
*bt_ctx
= user_data
;
1208 struct lttng_live_ctf_trace
*trace
= value
;
1211 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1213 fprintf(stderr
, "[error] removing trace from context\n");
1215 /* remove the key/value pair from the HT. */
1220 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1223 struct bt_context
*bt_ctx
= user_data
;
1224 struct lttng_live_ctf_trace
*trace
= value
;
1225 struct lttng_live_viewer_stream
*stream
;
1226 struct bt_mmap_stream
*new_mmap_stream
;
1227 struct bt_mmap_stream_list mmap_list
;
1228 struct lttng_live_ctx
*ctx
= NULL
;
1229 struct bt_trace_descriptor
*td
;
1230 struct bt_trace_handle
*handle
;
1233 * We don't know how many streams we will receive for a trace, so
1234 * once we are done receiving the traces, we add all the traces
1235 * received to the bt_context.
1236 * We can receive streams during the attach command or the
1237 * get_new_streams, so we have to make sure not to add multiple
1238 * times the same traces.
1239 * If a trace is already in the context, we just skip this function.
1244 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1246 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1247 stream
= g_ptr_array_index(trace
->streams
, i
);
1248 ctx
= stream
->session
->ctx
;
1250 if (!stream
->metadata_flag
) {
1251 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1252 new_mmap_stream
->priv
= (void *) stream
;
1253 new_mmap_stream
->fd
= -1;
1254 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1256 char *metadata_buf
= NULL
;
1258 /* Get all possible metadata before starting */
1259 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1264 if (!stream
->metadata_len
) {
1265 fprintf(stderr
, "[error] empty metadata\n");
1271 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1272 stream
->metadata_len
, "rb");
1273 if (!trace
->metadata_fp
) {
1274 perror("Metadata fmemopen");
1282 if (!trace
->metadata_fp
) {
1283 fprintf(stderr
, "[error] No metadata stream opened\n");
1287 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1288 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1290 fprintf(stderr
, "[error] Error adding trace\n");
1293 trace
->metadata_stream
->metadata_len
= 0;
1295 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1296 bt_ctx
->trace_handles
,
1297 (gpointer
) (unsigned long) ret
);
1299 trace
->handle
= handle
;
1300 if (bt_ctx
->current_iterator
) {
1301 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1304 trace
->trace_id
= ret
;
1310 bt_context_put(bt_ctx
);
1315 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1317 struct lttng_viewer_cmd cmd
;
1318 struct lttng_viewer_new_streams_request rq
;
1319 struct lttng_viewer_new_streams_response rp
;
1320 struct lttng_viewer_stream stream
;
1323 uint32_t stream_count
;
1325 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1326 cmd
.data_size
= sizeof(rq
);
1327 cmd
.cmd_version
= 0;
1329 memset(&rq
, 0, sizeof(rq
));
1330 rq
.session_id
= htobe64(id
);
1333 ret_len
= send(ctx
->control_sock
, &cmd
, sizeof(cmd
), 0);
1334 } while (ret_len
< 0 && errno
== EINTR
);
1336 perror("[error] Error sending cmd");
1340 assert(ret_len
== sizeof(cmd
));
1343 ret_len
= send(ctx
->control_sock
, &rq
, sizeof(rq
), 0);
1344 } while (ret_len
< 0 && errno
== EINTR
);
1346 perror("[error] Error sending get_new_streams request");
1350 assert(ret_len
== sizeof(rq
));
1353 ret_len
= recv(ctx
->control_sock
, &rp
, sizeof(rp
), 0);
1354 } while (ret_len
< 0 && errno
== EINTR
);
1356 fprintf(stderr
, "[error] Remote side has closed connection\n");
1361 perror("[error] Error receiving get_new_streams response");
1365 assert(ret_len
== sizeof(rp
));
1367 switch(be32toh(rp
.status
)) {
1368 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1370 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1373 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1374 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1376 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1377 fprintf(stderr
, "[error] get_new_streams error\n");
1381 fprintf(stderr
, "[error] Unknown return code %u\n",
1382 be32toh(rp
.status
));
1387 stream_count
= be32toh(rp
.streams_count
);
1388 ctx
->session
->stream_count
+= stream_count
;
1390 * When the session is created but not started, we do an active wait
1391 * until it starts. It allows the viewer to start processing the trace
1392 * as soon as the session starts.
1394 if (ctx
->session
->stream_count
== 0) {
1398 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1399 ctx
->session
->stream_count
);
1400 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1401 ctx
->session
->stream_count
);
1402 for (i
= 0; i
< stream_count
; i
++) {
1404 ret_len
= recv(ctx
->control_sock
, &stream
, sizeof(stream
), 0);
1405 } while (ret_len
< 0 && errno
== EINTR
);
1407 fprintf(stderr
, "[error] Remote side has closed connection\n");
1412 perror("[error] Error receiving stream");
1416 assert(ret_len
== sizeof(stream
));
1417 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1418 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1420 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1421 be64toh(stream
.id
), stream
.path_name
,
1422 stream
.channel_name
);
1423 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1424 ctx
->session
->streams
[i
].session
= ctx
->session
;
1426 ctx
->session
->streams
[i
].first_read
= 1;
1427 ctx
->session
->streams
[i
].mmap_size
= 0;
1429 if (be32toh(stream
.metadata_flag
)) {
1430 ctx
->session
->streams
[i
].metadata_flag
= 1;
1432 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1433 be64toh(stream
.ctf_trace_id
));
1446 void lttng_live_read(struct lttng_live_ctx
*ctx
)
1449 struct bt_ctf_iter
*iter
;
1450 const struct bt_ctf_event
*event
;
1451 struct bt_iter_pos begin_pos
;
1452 struct bt_trace_descriptor
*td_write
;
1453 struct bt_format
*fmt_write
;
1454 struct ctf_text_stream_pos
*sout
;
1457 ctx
->bt_ctx
= bt_context_create();
1459 fprintf(stderr
, "[error] bt_context_create allocation\n");
1463 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1465 fprintf(stderr
, "[error] ctf-text error\n");
1469 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1471 fprintf(stderr
, "[error] Error opening output trace\n");
1475 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1477 if (!sout
->parent
.event_cb
)
1480 ret
= lttng_live_create_viewer_session(ctx
);
1485 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1486 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1487 printf_verbose("Attaching to session %lu\n", id
);
1488 ret
= lttng_live_attach_session(ctx
, id
);
1489 printf_verbose("Attaching session returns %d\n", ret
);
1491 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1492 fprintf(stderr
, "[error] Unknown session ID\n");
1499 * As long as the session is active, we try to get new streams.
1504 while (!ctx
->session
->stream_count
) {
1505 if (ctx
->session_ids
->len
== 0)
1507 ret
= ask_new_streams(ctx
);
1512 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1515 begin_pos
.type
= BT_SEEK_BEGIN
;
1516 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1518 fprintf(stderr
, "[error] Iterator creation error\n");
1522 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1523 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1528 ret
= sout
->parent
.event_cb(&sout
->parent
,
1529 event
->parent
->stream
);
1531 fprintf(stderr
, "[error] Writing "
1536 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1541 bt_ctf_iter_destroy(iter
);
1542 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1543 del_traces
, ctx
->bt_ctx
);
1544 ctx
->session
->stream_count
= 0;
1548 bt_context_put(ctx
->bt_ctx
);