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/endian.h>
54 #include <babeltrace/compat/memstream.h>
56 #include "lttng-live.h"
57 #include "lttng-viewer-abi.h"
59 #define ACTIVE_POLL_DELAY 100 /* ms */
62 * Memory allocation zeroed
64 #define zmalloc(x) calloc(1, x)
67 #define max_t(type, a, b) \
68 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
71 static void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
,
72 size_t index
, int whence
);
73 static void add_traces(gpointer key
, gpointer value
, gpointer user_data
);
74 static int del_traces(gpointer key
, gpointer value
, gpointer user_data
);
75 static int get_new_metadata(struct lttng_live_ctx
*ctx
,
76 struct lttng_live_viewer_stream
*viewer_stream
,
80 ssize_t
lttng_live_recv(int fd
, void *buf
, size_t len
)
83 size_t copied
= 0, to_copy
= len
;
86 ret
= recv(fd
, buf
+ copied
, to_copy
, 0);
88 assert(ret
<= to_copy
);
92 } while ((ret
> 0 && to_copy
> 0)
93 || (ret
< 0 && errno
== EINTR
));
96 /* ret = 0 means orderly shutdown, ret < 0 is error. */
101 ssize_t
lttng_live_send(int fd
, const void *buf
, size_t len
)
106 ret
= send(fd
, buf
, len
, MSG_NOSIGNAL
);
107 } while (ret
< 0 && errno
== EINTR
);
111 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
113 struct hostent
*host
;
114 struct sockaddr_in server_addr
;
117 if (lttng_live_should_quit()) {
122 host
= gethostbyname(ctx
->relay_hostname
);
124 fprintf(stderr
, "[error] Cannot lookup hostname %s\n",
125 ctx
->relay_hostname
);
129 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
134 server_addr
.sin_family
= AF_INET
;
135 server_addr
.sin_port
= htons(ctx
->port
);
136 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
137 bzero(&(server_addr
.sin_zero
), 8);
139 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
140 sizeof(struct sockaddr
)) == -1) {
151 fprintf(stderr
, "[error] Connection failed\n");
155 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
157 struct lttng_viewer_cmd cmd
;
158 struct lttng_viewer_connect connect
;
162 if (lttng_live_should_quit()) {
167 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
168 cmd
.data_size
= sizeof(connect
);
171 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
172 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
173 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
174 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
176 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
178 perror("[error] Error sending cmd");
181 assert(ret_len
== sizeof(cmd
));
183 ret_len
= lttng_live_send(ctx
->control_sock
, &connect
, sizeof(connect
));
185 perror("[error] Error sending version");
188 assert(ret_len
== sizeof(connect
));
190 ret_len
= lttng_live_recv(ctx
->control_sock
, &connect
, sizeof(connect
));
192 fprintf(stderr
, "[error] Remote side has closed connection\n");
196 perror("[error] Error receiving version");
199 assert(ret_len
== sizeof(connect
));
201 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
202 be64toh(connect
.viewer_session_id
));
203 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
204 be32toh(connect
.minor
));
210 fprintf(stderr
, "[error] Unable to establish connection\n");
215 void free_session_list(GPtrArray
*session_list
)
218 struct lttng_live_relay_session
*relay_session
;
220 for (i
= 0; i
< session_list
->len
; i
++) {
221 relay_session
= g_ptr_array_index(session_list
, i
);
222 free(relay_session
->name
);
223 free(relay_session
->hostname
);
225 g_ptr_array_free(session_list
, TRUE
);
229 void print_session_list(GPtrArray
*session_list
, const char *path
)
232 struct lttng_live_relay_session
*relay_session
;
234 for (i
= 0; i
< session_list
->len
; i
++) {
235 relay_session
= g_ptr_array_index(session_list
, i
);
236 fprintf(stdout
, "%s/host/%s/%s (timer = %u, "
237 "%u stream(s), %u client(s) connected)\n",
238 path
, relay_session
->hostname
,
239 relay_session
->name
, relay_session
->timer
,
240 relay_session
->streams
, relay_session
->clients
);
245 void update_session_list(GPtrArray
*session_list
, char *hostname
,
246 char *session_name
, uint32_t streams
, uint32_t clients
,
250 struct lttng_live_relay_session
*relay_session
;
252 for (i
= 0; i
< session_list
->len
; i
++) {
253 relay_session
= g_ptr_array_index(session_list
, i
);
254 if ((strncmp(relay_session
->hostname
, hostname
, NAME_MAX
) == 0) &&
255 strncmp(relay_session
->name
,
256 session_name
, NAME_MAX
) == 0) {
257 relay_session
->streams
+= streams
;
258 if (relay_session
->clients
< clients
)
259 relay_session
->clients
= clients
;
267 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
268 relay_session
->hostname
= strndup(hostname
, NAME_MAX
);
269 relay_session
->name
= strndup(session_name
, NAME_MAX
);
270 relay_session
->clients
= clients
;
271 relay_session
->streams
= streams
;
272 relay_session
->timer
= timer
;
273 g_ptr_array_add(session_list
, relay_session
);
276 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
278 struct lttng_viewer_cmd cmd
;
279 struct lttng_viewer_list_sessions list
;
280 struct lttng_viewer_session lsession
;
281 int i
, ret
, sessions_count
, print_list
= 0;
284 GPtrArray
*session_list
= NULL
;
286 if (lttng_live_should_quit()) {
291 if (strlen(ctx
->session_name
) == 0) {
293 session_list
= g_ptr_array_new();
296 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
300 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
302 perror("[error] Error sending cmd");
305 assert(ret_len
== sizeof(cmd
));
307 ret_len
= lttng_live_recv(ctx
->control_sock
, &list
, sizeof(list
));
309 fprintf(stderr
, "[error] Remote side has closed connection\n");
313 perror("[error] Error receiving session list");
316 assert(ret_len
== sizeof(list
));
318 sessions_count
= be32toh(list
.sessions_count
);
319 for (i
= 0; i
< sessions_count
; i
++) {
320 ret_len
= lttng_live_recv(ctx
->control_sock
, &lsession
, sizeof(lsession
));
322 fprintf(stderr
, "[error] Remote side has closed connection\n");
326 perror("[error] Error receiving session");
329 assert(ret_len
== sizeof(lsession
));
330 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
331 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
332 session_id
= be64toh(lsession
.id
);
335 update_session_list(session_list
,
337 lsession
.session_name
,
338 be32toh(lsession
.streams
),
339 be32toh(lsession
.clients
),
340 be32toh(lsession
.live_timer
));
342 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
343 NAME_MAX
) == 0) && (strncmp(lsession
.hostname
,
344 ctx
->traced_hostname
, NAME_MAX
) == 0)) {
345 printf_verbose("Reading from session %" PRIu64
"\n",
347 g_array_append_val(ctx
->session_ids
,
354 print_session_list(session_list
, path
);
355 free_session_list(session_list
);
362 fprintf(stderr
, "[error] Unable to list sessions\n");
366 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
367 uint64_t ctf_trace_id
)
369 struct lttng_live_ctf_trace
*trace
;
372 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
373 (gpointer
) ctf_trace_id
);
375 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
376 trace
->ctf_trace_id
= ctf_trace_id
;
377 trace
->streams
= g_ptr_array_new();
378 g_hash_table_insert(stream
->session
->ctf_traces
,
379 (gpointer
) ctf_trace_id
,
382 if (stream
->metadata_flag
)
383 trace
->metadata_stream
= stream
;
385 stream
->ctf_trace
= trace
;
386 g_ptr_array_add(trace
->streams
, stream
);
392 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
393 char **metadata_buf
, size_t *size
)
397 stream
->metadata_fp_write
=
398 babeltrace_open_memstream(metadata_buf
, size
);
399 if (!stream
->metadata_fp_write
) {
400 perror("Metadata open_memstream");
407 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
409 struct lttng_viewer_cmd cmd
;
410 struct lttng_viewer_attach_session_request rq
;
411 struct lttng_viewer_attach_session_response rp
;
412 struct lttng_viewer_stream stream
;
416 if (lttng_live_should_quit()) {
421 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
422 cmd
.data_size
= sizeof(rq
);
425 memset(&rq
, 0, sizeof(rq
));
426 rq
.session_id
= htobe64(id
);
427 // TODO: add cmd line parameter to select seek beginning
428 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
429 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
431 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
433 perror("[error] Error sending cmd");
436 assert(ret_len
== sizeof(cmd
));
438 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
440 perror("[error] Error sending attach request");
443 assert(ret_len
== sizeof(rq
));
445 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
447 fprintf(stderr
, "[error] Remote side has closed connection\n");
451 perror("[error] Error receiving attach response");
454 assert(ret_len
== sizeof(rp
));
456 switch(be32toh(rp
.status
)) {
457 case LTTNG_VIEWER_ATTACH_OK
:
459 case LTTNG_VIEWER_ATTACH_UNK
:
460 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
462 case LTTNG_VIEWER_ATTACH_ALREADY
:
463 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
465 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
466 fprintf(stderr
, "[error] Not a live session\n");
468 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
469 fprintf(stderr
, "[error] Wrong seek parameter\n");
472 fprintf(stderr
, "[error] Unknown attach return code %u\n",
476 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
480 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
482 * When the session is created but not started, we do an active wait
483 * until it starts. It allows the viewer to start processing the trace
484 * as soon as the session starts.
486 if (ctx
->session
->stream_count
== 0) {
490 printf_verbose("Waiting for %" PRIu64
" streams:\n",
491 ctx
->session
->stream_count
);
492 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
493 ctx
->session
->stream_count
);
494 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
495 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
497 fprintf(stderr
, "[error] Remote side has closed connection\n");
501 perror("[error] Error receiving stream");
504 assert(ret_len
== sizeof(stream
));
505 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
506 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
508 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
509 be64toh(stream
.id
), stream
.path_name
,
510 stream
.channel_name
);
511 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
512 ctx
->session
->streams
[i
].session
= ctx
->session
;
514 ctx
->session
->streams
[i
].first_read
= 1;
515 ctx
->session
->streams
[i
].mmap_size
= 0;
517 if (be32toh(stream
.metadata_flag
)) {
518 ctx
->session
->streams
[i
].metadata_flag
= 1;
520 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
521 be64toh(stream
.ctf_trace_id
));
536 * Ask the relay for new streams.
538 * Returns the number of new streams received or a negative value on error.
541 int ask_new_streams(struct lttng_live_ctx
*ctx
)
543 int i
, ret
= 0, nb_streams
= 0;
547 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
548 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
549 ret
= lttng_live_get_new_streams(ctx
, id
);
550 printf_verbose("Asking for new streams returns %d\n", ret
);
552 if (lttng_live_should_quit()) {
555 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
556 printf_verbose("Session %" PRIu64
" closed\n",
559 * The streams have already been closed during
560 * the reading, so we only need to get rid of
561 * the trace in our internal table of sessions.
563 g_array_remove_index(ctx
->session_ids
, i
);
565 * We can't continue iterating on the g_array
566 * after a remove, we have to start again.
584 int append_metadata(struct lttng_live_ctx
*ctx
,
585 struct lttng_live_viewer_stream
*viewer_stream
)
588 struct lttng_live_viewer_stream
*metadata
;
589 char *metadata_buf
= NULL
;
591 printf_verbose("get_next_index: new metadata needed\n");
592 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
598 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
599 metadata
->ctf_trace
->metadata_fp
=
600 babeltrace_fmemopen(metadata_buf
,
601 metadata
->metadata_len
, "rb");
602 if (!metadata
->ctf_trace
->metadata_fp
) {
603 perror("Metadata fmemopen");
608 ret
= ctf_append_trace_metadata(
609 viewer_stream
->ctf_trace
->handle
->td
,
610 metadata
->ctf_trace
->metadata_fp
);
611 /* We accept empty metadata packets */
612 if (ret
!= 0 && ret
!= -ENOENT
) {
613 fprintf(stderr
, "[error] Appending metadata\n");
623 int get_data_packet(struct lttng_live_ctx
*ctx
,
624 struct ctf_stream_pos
*pos
,
625 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
628 struct lttng_viewer_cmd cmd
;
629 struct lttng_viewer_get_packet rq
;
630 struct lttng_viewer_trace_packet rp
;
635 if (lttng_live_should_quit()) {
639 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
640 cmd
.data_size
= sizeof(rq
);
643 memset(&rq
, 0, sizeof(rq
));
644 rq
.stream_id
= htobe64(stream
->id
);
645 rq
.offset
= htobe64(offset
);
646 rq
.len
= htobe32(len
);
648 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
650 perror("[error] Error sending cmd");
653 assert(ret_len
== sizeof(cmd
));
655 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
657 perror("[error] Error sending get_data_packet request");
660 assert(ret_len
== sizeof(rq
));
662 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
664 fprintf(stderr
, "[error] Remote side has closed connection\n");
668 perror("[error] Error receiving data response");
671 if (ret_len
!= sizeof(rp
)) {
672 fprintf(stderr
, "[error] get_data_packet: expected %" PRId64
673 ", received %" PRId64
"\n", sizeof(rp
),
678 rp
.flags
= be32toh(rp
.flags
);
680 switch (be32toh(rp
.status
)) {
681 case LTTNG_VIEWER_GET_PACKET_OK
:
682 len
= be32toh(rp
.len
);
683 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
686 case LTTNG_VIEWER_GET_PACKET_RETRY
:
687 /* Unimplemented by relay daemon */
688 printf_verbose("get_data_packet: retry\n");
690 case LTTNG_VIEWER_GET_PACKET_ERR
:
691 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
692 printf_verbose("get_data_packet: new metadata needed\n");
693 ret
= append_metadata(ctx
, stream
);
697 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
698 printf_verbose("get_data_packet: new streams needed\n");
699 ret
= ask_new_streams(ctx
);
703 g_hash_table_foreach(ctx
->session
->ctf_traces
,
704 add_traces
, ctx
->bt_ctx
);
706 if (rp
.flags
& (LTTNG_VIEWER_FLAG_NEW_METADATA
707 | LTTNG_VIEWER_FLAG_NEW_STREAM
)) {
710 fprintf(stderr
, "[error] get_data_packet: error\n");
712 case LTTNG_VIEWER_GET_PACKET_EOF
:
716 printf_verbose("get_data_packet: unknown\n");
724 if (len
> stream
->mmap_size
) {
727 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
730 ret
= munmap_align(pos
->base_mma
);
732 perror("[error] Unable to unmap old base");
735 pos
->base_mma
= NULL
;
737 pos
->base_mma
= mmap_align(new_size
,
738 PROT_READ
| PROT_WRITE
,
739 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
740 if (pos
->base_mma
== MAP_FAILED
) {
741 perror("[error] mmap error");
742 pos
->base_mma
= NULL
;
746 stream
->mmap_size
= new_size
;
747 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
751 ret_len
= lttng_live_recv(ctx
->control_sock
,
752 mmap_align_addr(pos
->base_mma
), len
);
754 fprintf(stderr
, "[error] Remote side has closed connection\n");
758 perror("[error] Error receiving trace packet");
761 assert(ret_len
== len
);
771 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
772 struct lttng_live_viewer_stream
*metadata_stream
)
776 struct lttng_viewer_cmd cmd
;
777 struct lttng_viewer_get_metadata rq
;
778 struct lttng_viewer_metadata_packet rp
;
782 if (lttng_live_should_quit()) {
787 rq
.stream_id
= htobe64(metadata_stream
->id
);
788 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
789 cmd
.data_size
= sizeof(rq
);
792 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
794 perror("[error] Error sending cmd");
797 assert(ret_len
== sizeof(cmd
));
799 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
801 perror("[error] Error sending get_metadata request");
804 assert(ret_len
== sizeof(rq
));
806 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
808 fprintf(stderr
, "[error] Remote side has closed connection\n");
812 perror("[error] Error receiving metadata response");
815 assert(ret_len
== sizeof(rp
));
817 switch (be32toh(rp
.status
)) {
818 case LTTNG_VIEWER_METADATA_OK
:
819 printf_verbose("get_metadata : OK\n");
821 case LTTNG_VIEWER_NO_NEW_METADATA
:
822 printf_verbose("get_metadata : NO NEW\n");
825 case LTTNG_VIEWER_METADATA_ERR
:
826 printf_verbose("get_metadata : ERR\n");
829 printf_verbose("get_metadata : UNKNOWN\n");
833 len
= be64toh(rp
.len
);
834 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
841 perror("relay data zmalloc");
844 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
846 fprintf(stderr
, "[error] Remote side has closed connection\n");
847 goto error_free_data
;
850 perror("[error] Error receiving trace packet");
851 goto error_free_data
;
853 assert(ret_len
== len
);
856 ret_len
= fwrite(data
, 1, len
,
857 metadata_stream
->metadata_fp_write
);
858 } while (ret_len
< 0 && errno
== EINTR
);
860 fprintf(stderr
, "[error] Writing in the metadata fp\n");
861 goto error_free_data
;
863 assert(ret_len
== len
);
864 metadata_stream
->metadata_len
+= len
;
877 * Return 0 on success, a negative value on error.
880 int get_new_metadata(struct lttng_live_ctx
*ctx
,
881 struct lttng_live_viewer_stream
*viewer_stream
,
885 struct lttng_live_viewer_stream
*metadata_stream
;
886 size_t size
, len_read
= 0;
888 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
889 if (!metadata_stream
) {
890 fprintf(stderr
, "[error] No metadata stream\n");
894 metadata_stream
->metadata_len
= 0;
895 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
902 * get_one_metadata_packet returns the number of bytes
903 * received, 0 when we have received everything, a
904 * negative value on error.
906 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
911 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
913 } while (ret
> 0 || !len_read
);
915 if (fclose(metadata_stream
->metadata_fp_write
))
917 metadata_stream
->metadata_fp_write
= NULL
;
924 * Get one index for a stream.
926 * Returns 0 on success or a negative value on error.
929 int get_next_index(struct lttng_live_ctx
*ctx
,
930 struct lttng_live_viewer_stream
*viewer_stream
,
931 struct packet_index
*index
)
933 struct lttng_viewer_cmd cmd
;
934 struct lttng_viewer_get_next_index rq
;
935 struct lttng_viewer_index rp
;
939 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
940 cmd
.data_size
= sizeof(rq
);
943 memset(&rq
, 0, sizeof(rq
));
944 rq
.stream_id
= htobe64(viewer_stream
->id
);
947 if (lttng_live_should_quit()) {
951 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
953 perror("[error] Error sending cmd");
956 assert(ret_len
== sizeof(cmd
));
958 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
960 perror("[error] Error sending get_next_index request");
963 assert(ret_len
== sizeof(rq
));
965 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
967 fprintf(stderr
, "[error] Remote side has closed connection\n");
971 perror("[error] Error receiving index response");
974 assert(ret_len
== sizeof(rp
));
976 rp
.flags
= be32toh(rp
.flags
);
978 switch (be32toh(rp
.status
)) {
979 case LTTNG_VIEWER_INDEX_INACTIVE
:
980 printf_verbose("get_next_index: inactive\n");
981 memset(index
, 0, sizeof(struct packet_index
));
982 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
984 case LTTNG_VIEWER_INDEX_OK
:
985 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
986 rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
987 index
->offset
= be64toh(rp
.offset
);
988 index
->packet_size
= be64toh(rp
.packet_size
);
989 index
->content_size
= be64toh(rp
.content_size
);
990 index
->ts_cycles
.timestamp_begin
= be64toh(rp
.timestamp_begin
);
991 index
->ts_cycles
.timestamp_end
= be64toh(rp
.timestamp_end
);
992 index
->events_discarded
= be64toh(rp
.events_discarded
);
994 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
995 ret
= append_metadata(ctx
, viewer_stream
);
999 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
1000 printf_verbose("get_next_index: need new streams\n");
1001 ret
= ask_new_streams(ctx
);
1005 g_hash_table_foreach(ctx
->session
->ctf_traces
,
1006 add_traces
, ctx
->bt_ctx
);
1009 case LTTNG_VIEWER_INDEX_RETRY
:
1010 printf_verbose("get_next_index: retry\n");
1011 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1013 case LTTNG_VIEWER_INDEX_HUP
:
1014 printf_verbose("get_next_index: stream hung up\n");
1015 viewer_stream
->id
= -1ULL;
1016 index
->offset
= EOF
;
1017 ctx
->session
->stream_count
--;
1019 case LTTNG_VIEWER_INDEX_ERR
:
1020 fprintf(stderr
, "[error] get_next_index: error\n");
1023 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1035 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1038 struct ctf_stream_pos
*pos
;
1039 struct ctf_file_stream
*file_stream
;
1040 struct packet_index
*prev_index
= NULL
, *cur_index
;
1041 struct lttng_live_viewer_stream
*viewer_stream
;
1042 struct lttng_live_session
*session
;
1046 pos
= ctf_pos(stream_pos
);
1047 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1048 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1049 session
= viewer_stream
->session
;
1051 switch (pos
->packet_index
->len
) {
1053 g_array_set_size(pos
->packet_index
, 1);
1054 cur_index
= &g_array_index(pos
->packet_index
,
1055 struct packet_index
, 0);
1058 g_array_set_size(pos
->packet_index
, 2);
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);
1065 g_array_index(pos
->packet_index
,
1066 struct packet_index
, 0) =
1067 g_array_index(pos
->packet_index
,
1068 struct packet_index
, 1);
1069 prev_index
= &g_array_index(pos
->packet_index
,
1070 struct packet_index
, 0);
1071 cur_index
= &g_array_index(pos
->packet_index
,
1072 struct packet_index
, 1);
1078 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1079 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
);
1082 if (!lttng_live_should_quit()) {
1083 fprintf(stderr
, "[error] get_next_index failed\n");
1088 pos
->packet_size
= cur_index
->packet_size
;
1089 pos
->content_size
= cur_index
->content_size
;
1090 pos
->mmap_base_offset
= 0;
1091 if (cur_index
->offset
== EOF
) {
1097 if (cur_index
->content_size
== 0) {
1098 file_stream
->parent
.cycles_timestamp
=
1099 cur_index
->ts_cycles
.timestamp_end
;
1100 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1101 &file_stream
->parent
,
1102 cur_index
->ts_cycles
.timestamp_end
);
1104 /* Convert the timestamps and append to the real_index. */
1105 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1106 &file_stream
->parent
,
1107 cur_index
->ts_cycles
.timestamp_begin
);
1108 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1109 &file_stream
->parent
,
1110 cur_index
->ts_cycles
.timestamp_end
);
1112 ctf_update_current_packet_index(&file_stream
->parent
,
1113 prev_index
, cur_index
);
1115 file_stream
->parent
.cycles_timestamp
=
1116 cur_index
->ts_cycles
.timestamp_begin
;
1117 file_stream
->parent
.real_timestamp
=
1118 cur_index
->ts_real
.timestamp_begin
;
1121 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1125 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1127 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1129 cur_index
->packet_size
/ CHAR_BIT
);
1132 } else if (ret
< 0) {
1134 if (!lttng_live_should_quit()) {
1135 fprintf(stderr
, "[error] get_data_packet failed\n");
1140 printf_verbose("Index received : packet_size : %" PRIu64
1141 ", offset %" PRIu64
", content_size %" PRIu64
1142 ", timestamp_end : %" PRIu64
"\n",
1143 cur_index
->packet_size
, cur_index
->offset
,
1144 cur_index
->content_size
,
1145 cur_index
->ts_cycles
.timestamp_end
);
1147 /* update trace_packet_header and stream_packet_context */
1148 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.trace_packet_header
) {
1149 /* Read packet header */
1150 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.trace_packet_header
->p
);
1153 fprintf(stderr
, "[error] trace packet header read failed\n");
1157 if (pos
->prot
!= PROT_WRITE
&& file_stream
->parent
.stream_packet_context
) {
1158 /* Read packet context */
1159 ret
= generic_rw(&pos
->parent
, &file_stream
->parent
.stream_packet_context
->p
);
1162 fprintf(stderr
, "[error] stream packet context read failed\n");
1166 pos
->data_offset
= pos
->offset
;
1172 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1174 struct lttng_viewer_cmd cmd
;
1175 struct lttng_viewer_create_session_response resp
;
1179 if (lttng_live_should_quit()) {
1184 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1186 cmd
.cmd_version
= 0;
1188 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1190 perror("[error] Error sending cmd");
1193 assert(ret_len
== sizeof(cmd
));
1195 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1197 fprintf(stderr
, "[error] Remote side has closed connection\n");
1201 perror("[error] Error receiving create session reply");
1204 assert(ret_len
== sizeof(resp
));
1206 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1207 fprintf(stderr
, "[error] Error creating viewer session\n");
1219 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1221 struct bt_context
*bt_ctx
= user_data
;
1222 struct lttng_live_ctf_trace
*trace
= value
;
1225 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1227 fprintf(stderr
, "[error] removing trace from context\n");
1229 /* remove the key/value pair from the HT. */
1234 void add_traces(gpointer key
, gpointer value
, gpointer user_data
)
1237 struct bt_context
*bt_ctx
= user_data
;
1238 struct lttng_live_ctf_trace
*trace
= value
;
1239 struct lttng_live_viewer_stream
*stream
;
1240 struct bt_mmap_stream
*new_mmap_stream
;
1241 struct bt_mmap_stream_list mmap_list
;
1242 struct lttng_live_ctx
*ctx
= NULL
;
1243 struct bt_trace_descriptor
*td
;
1244 struct bt_trace_handle
*handle
;
1247 * We don't know how many streams we will receive for a trace, so
1248 * once we are done receiving the traces, we add all the traces
1249 * received to the bt_context.
1250 * We can receive streams during the attach command or the
1251 * get_new_streams, so we have to make sure not to add multiple
1252 * times the same traces.
1253 * If a trace is already in the context, we just skip this function.
1258 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1260 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1261 stream
= g_ptr_array_index(trace
->streams
, i
);
1262 ctx
= stream
->session
->ctx
;
1264 if (!stream
->metadata_flag
) {
1265 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1266 new_mmap_stream
->priv
= (void *) stream
;
1267 new_mmap_stream
->fd
= -1;
1268 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1270 char *metadata_buf
= NULL
;
1272 /* Get all possible metadata before starting */
1273 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1278 if (!stream
->metadata_len
) {
1279 fprintf(stderr
, "[error] empty metadata\n");
1285 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1286 stream
->metadata_len
, "rb");
1287 if (!trace
->metadata_fp
) {
1288 perror("Metadata fmemopen");
1296 if (!trace
->metadata_fp
) {
1297 fprintf(stderr
, "[error] No metadata stream opened\n");
1301 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1302 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1304 fprintf(stderr
, "[error] Error adding trace\n");
1307 trace
->metadata_stream
->metadata_len
= 0;
1309 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1310 bt_ctx
->trace_handles
,
1311 (gpointer
) (unsigned long) ret
);
1313 trace
->handle
= handle
;
1314 if (bt_ctx
->current_iterator
) {
1315 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1318 trace
->trace_id
= ret
;
1324 bt_context_put(bt_ctx
);
1330 * Request new streams for a session.
1331 * Returns the number of streams received or a negative value on error.
1333 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1335 struct lttng_viewer_cmd cmd
;
1336 struct lttng_viewer_new_streams_request rq
;
1337 struct lttng_viewer_new_streams_response rp
;
1338 struct lttng_viewer_stream stream
;
1339 int ret
, i
, nb_streams
= 0;
1341 uint32_t stream_count
;
1343 if (lttng_live_should_quit()) {
1348 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1349 cmd
.data_size
= sizeof(rq
);
1350 cmd
.cmd_version
= 0;
1352 memset(&rq
, 0, sizeof(rq
));
1353 rq
.session_id
= htobe64(id
);
1355 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1357 perror("[error] Error sending cmd");
1360 assert(ret_len
== sizeof(cmd
));
1362 ret_len
= lttng_live_send(ctx
->control_sock
, &rq
, sizeof(rq
));
1364 perror("[error] Error sending get_new_streams request");
1367 assert(ret_len
== sizeof(rq
));
1369 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1371 fprintf(stderr
, "[error] Remote side has closed connection\n");
1375 perror("[error] Error receiving get_new_streams response");
1378 assert(ret_len
== sizeof(rp
));
1380 switch(be32toh(rp
.status
)) {
1381 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1383 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1386 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1387 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1389 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1390 fprintf(stderr
, "[error] get_new_streams error\n");
1393 fprintf(stderr
, "[error] Unknown return code %u\n",
1394 be32toh(rp
.status
));
1398 stream_count
= be32toh(rp
.streams_count
);
1399 ctx
->session
->stream_count
+= stream_count
;
1401 * When the session is created but not started, we do an active wait
1402 * until it starts. It allows the viewer to start processing the trace
1403 * as soon as the session starts.
1405 if (ctx
->session
->stream_count
== 0) {
1409 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1410 ctx
->session
->stream_count
);
1411 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1412 ctx
->session
->stream_count
);
1413 for (i
= 0; i
< stream_count
; i
++) {
1414 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
1416 fprintf(stderr
, "[error] Remote side has closed connection\n");
1420 perror("[error] Error receiving stream");
1423 assert(ret_len
== sizeof(stream
));
1424 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1425 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1427 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1428 be64toh(stream
.id
), stream
.path_name
,
1429 stream
.channel_name
);
1430 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1431 ctx
->session
->streams
[i
].session
= ctx
->session
;
1433 ctx
->session
->streams
[i
].first_read
= 1;
1434 ctx
->session
->streams
[i
].mmap_size
= 0;
1436 if (be32toh(stream
.metadata_flag
)) {
1437 ctx
->session
->streams
[i
].metadata_flag
= 1;
1439 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1440 be64toh(stream
.ctf_trace_id
));
1455 int lttng_live_read(struct lttng_live_ctx
*ctx
)
1459 struct bt_ctf_iter
*iter
;
1460 const struct bt_ctf_event
*event
;
1461 struct bt_iter_pos begin_pos
;
1462 struct bt_trace_descriptor
*td_write
;
1463 struct bt_format
*fmt_write
;
1464 struct ctf_text_stream_pos
*sout
;
1467 ctx
->bt_ctx
= bt_context_create();
1469 fprintf(stderr
, "[error] bt_context_create allocation\n");
1473 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1475 fprintf(stderr
, "[error] ctf-text error\n");
1479 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1481 fprintf(stderr
, "[error] Error opening output trace\n");
1485 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1487 if (!sout
->parent
.event_cb
) {
1491 ret
= lttng_live_create_viewer_session(ctx
);
1496 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1497 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1498 printf_verbose("Attaching to session %lu\n", id
);
1499 ret
= lttng_live_attach_session(ctx
, id
);
1500 printf_verbose("Attaching session returns %d\n", ret
);
1502 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1503 fprintf(stderr
, "[error] Unknown session ID\n");
1510 * As long as the session is active, we try to get new streams.
1515 if (lttng_live_should_quit()) {
1520 while (!ctx
->session
->stream_count
) {
1521 if (lttng_live_should_quit()
1522 || ctx
->session_ids
->len
== 0) {
1526 ret
= ask_new_streams(ctx
);
1530 if (!ctx
->session
->stream_count
) {
1531 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1535 g_hash_table_foreach(ctx
->session
->ctf_traces
, add_traces
,
1538 begin_pos
.type
= BT_SEEK_BEGIN
;
1539 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1541 if (lttng_live_should_quit()) {
1545 fprintf(stderr
, "[error] Iterator creation error\n");
1549 if (lttng_live_should_quit()) {
1553 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1554 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1559 ret
= sout
->parent
.event_cb(&sout
->parent
,
1560 event
->parent
->stream
);
1562 fprintf(stderr
, "[error] Writing "
1567 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1572 bt_ctf_iter_destroy(iter
);
1573 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1574 del_traces
, ctx
->bt_ctx
);
1575 ctx
->session
->stream_count
= 0;
1579 bt_context_put(ctx
->bt_ctx
);
1581 if (lttng_live_should_quit()) {