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>
36 #include <babeltrace/ctf/ctf-index.h>
38 #include <babeltrace/babeltrace.h>
39 #include <babeltrace/endian.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>
53 #include <babeltrace/compat/send.h>
54 #include <babeltrace/compat/string.h>
55 #include <babeltrace/compat/mman.h>
57 #include "lttng-live.h"
58 #include "lttng-viewer-abi.h"
60 #define ACTIVE_POLL_DELAY 100 /* ms */
63 * Memory allocation zeroed
65 #define zmalloc(x) calloc(1, x)
68 #define max_t(type, a, b) \
69 ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
72 static void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
,
73 size_t index
, int whence
);
74 static int add_traces(struct lttng_live_ctx
*ctx
);
75 static int del_traces(gpointer key
, gpointer value
, gpointer user_data
);
76 static int get_new_metadata(struct lttng_live_ctx
*ctx
,
77 struct lttng_live_viewer_stream
*viewer_stream
,
81 ssize_t
lttng_live_recv(int fd
, void *buf
, size_t len
)
84 size_t copied
= 0, to_copy
= len
;
87 ret
= recv(fd
, buf
+ copied
, to_copy
, 0);
89 assert(ret
<= to_copy
);
93 } while ((ret
> 0 && to_copy
> 0)
94 || (ret
< 0 && errno
== EINTR
));
97 /* ret = 0 means orderly shutdown, ret < 0 is error. */
102 ssize_t
lttng_live_send(int fd
, const void *buf
, size_t len
)
107 ret
= bt_send_nosigpipe(fd
, buf
, len
);
108 } while (ret
< 0 && errno
== EINTR
);
112 int lttng_live_connect_viewer(struct lttng_live_ctx
*ctx
)
114 struct hostent
*host
;
115 struct sockaddr_in server_addr
;
118 if (lttng_live_should_quit()) {
123 host
= gethostbyname(ctx
->relay_hostname
);
125 fprintf(stderr
, "[error] Cannot lookup hostname %s\n",
126 ctx
->relay_hostname
);
130 if ((ctx
->control_sock
= socket(AF_INET
, SOCK_STREAM
, 0)) == -1) {
135 server_addr
.sin_family
= AF_INET
;
136 server_addr
.sin_port
= htons(ctx
->port
);
137 server_addr
.sin_addr
= *((struct in_addr
*) host
->h_addr
);
138 memset(&(server_addr
.sin_zero
), 0, 8);
140 if (connect(ctx
->control_sock
, (struct sockaddr
*) &server_addr
,
141 sizeof(struct sockaddr
)) == -1) {
152 fprintf(stderr
, "[error] Connection failed\n");
156 int lttng_live_establish_connection(struct lttng_live_ctx
*ctx
)
158 struct lttng_viewer_cmd cmd
;
159 struct lttng_viewer_connect connect
;
160 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(connect
);
161 char cmd_buf
[cmd_buf_len
];
165 if (lttng_live_should_quit()) {
170 cmd
.cmd
= htobe32(LTTNG_VIEWER_CONNECT
);
171 cmd
.data_size
= htobe64((uint64_t) sizeof(connect
));
172 cmd
.cmd_version
= htobe32(0);
174 connect
.viewer_session_id
= -1ULL; /* will be set on recv */
175 connect
.major
= htobe32(LTTNG_LIVE_MAJOR
);
176 connect
.minor
= htobe32(LTTNG_LIVE_MINOR
);
177 connect
.type
= htobe32(LTTNG_VIEWER_CLIENT_COMMAND
);
180 * Merge the cmd and connection request to prevent a write-write
181 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
182 * second write to be performed quickly in presence of Nagle's algorithm.
184 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
185 memcpy(cmd_buf
+ sizeof(cmd
), &connect
, sizeof(connect
));
187 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
189 perror("[error] Error sending cmd for establishing session");
192 assert(ret_len
== cmd_buf_len
);
194 ret_len
= lttng_live_recv(ctx
->control_sock
, &connect
, sizeof(connect
));
196 fprintf(stderr
, "[error] Remote side has closed connection\n");
200 perror("[error] Error receiving version");
203 assert(ret_len
== sizeof(connect
));
205 printf_verbose("Received viewer session ID : %" PRIu64
"\n",
206 be64toh(connect
.viewer_session_id
));
207 printf_verbose("Relayd version : %u.%u\n", be32toh(connect
.major
),
208 be32toh(connect
.minor
));
210 if (LTTNG_LIVE_MAJOR
!= be32toh(connect
.major
)) {
211 fprintf(stderr
, "[error] Incompatible lttng-relayd protocol\n");
214 /* Use the smallest protocol version implemented. */
215 if (LTTNG_LIVE_MINOR
> be32toh(connect
.minor
)) {
216 ctx
->minor
= be32toh(connect
.minor
);
218 ctx
->minor
= LTTNG_LIVE_MINOR
;
220 ctx
->major
= LTTNG_LIVE_MAJOR
;
226 fprintf(stderr
, "[error] Unable to establish connection\n");
231 void free_session_list(GPtrArray
*session_list
)
234 struct lttng_live_relay_session
*relay_session
;
236 for (i
= 0; i
< session_list
->len
; i
++) {
237 relay_session
= g_ptr_array_index(session_list
, i
);
238 free(relay_session
->name
);
239 free(relay_session
->hostname
);
241 g_ptr_array_free(session_list
, TRUE
);
245 void print_session_list(GPtrArray
*session_list
, const char *path
)
248 struct lttng_live_relay_session
*relay_session
;
250 for (i
= 0; i
< session_list
->len
; i
++) {
251 relay_session
= g_ptr_array_index(session_list
, i
);
252 fprintf(LTTNG_LIVE_OUTPUT_FP
, "%s/host/%s/%s (timer = %u, "
253 "%u stream(s), %u client(s) connected)\n",
254 path
, relay_session
->hostname
,
255 relay_session
->name
, relay_session
->timer
,
256 relay_session
->streams
, relay_session
->clients
);
261 void update_session_list(GPtrArray
*session_list
, char *hostname
,
262 char *session_name
, uint32_t streams
, uint32_t clients
,
266 struct lttng_live_relay_session
*relay_session
;
268 for (i
= 0; i
< session_list
->len
; i
++) {
269 relay_session
= g_ptr_array_index(session_list
, i
);
270 if ((strncmp(relay_session
->hostname
, hostname
, MAXNAMLEN
) == 0) &&
271 strncmp(relay_session
->name
,
272 session_name
, MAXNAMLEN
) == 0) {
273 relay_session
->streams
+= streams
;
274 if (relay_session
->clients
< clients
)
275 relay_session
->clients
= clients
;
283 relay_session
= g_new0(struct lttng_live_relay_session
, 1);
284 relay_session
->hostname
= bt_strndup(hostname
, MAXNAMLEN
);
285 relay_session
->name
= bt_strndup(session_name
, MAXNAMLEN
);
286 relay_session
->clients
= clients
;
287 relay_session
->streams
= streams
;
288 relay_session
->timer
= timer
;
289 g_ptr_array_add(session_list
, relay_session
);
292 int lttng_live_list_sessions(struct lttng_live_ctx
*ctx
, const char *path
)
294 struct lttng_viewer_cmd cmd
;
295 struct lttng_viewer_list_sessions list
;
296 struct lttng_viewer_session lsession
;
297 int i
, ret
, sessions_count
, print_list
= 0;
300 GPtrArray
*session_list
= NULL
;
302 if (lttng_live_should_quit()) {
307 if (strlen(ctx
->session_name
) == 0) {
309 session_list
= g_ptr_array_new();
312 cmd
.cmd
= htobe32(LTTNG_VIEWER_LIST_SESSIONS
);
313 cmd
.data_size
= htobe64((uint64_t) 0);
314 cmd
.cmd_version
= htobe32(0);
316 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
318 perror("[error] Error sending cmd");
321 assert(ret_len
== sizeof(cmd
));
323 ret_len
= lttng_live_recv(ctx
->control_sock
, &list
, sizeof(list
));
325 fprintf(stderr
, "[error] Remote side has closed connection\n");
329 perror("[error] Error receiving session list");
332 assert(ret_len
== sizeof(list
));
334 sessions_count
= be32toh(list
.sessions_count
);
335 for (i
= 0; i
< sessions_count
; i
++) {
336 ret_len
= lttng_live_recv(ctx
->control_sock
, &lsession
, sizeof(lsession
));
338 fprintf(stderr
, "[error] Remote side has closed connection\n");
342 perror("[error] Error receiving session");
345 assert(ret_len
== sizeof(lsession
));
346 lsession
.hostname
[LTTNG_VIEWER_HOST_NAME_MAX
- 1] = '\0';
347 lsession
.session_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
348 session_id
= be64toh(lsession
.id
);
351 update_session_list(session_list
,
353 lsession
.session_name
,
354 be32toh(lsession
.streams
),
355 be32toh(lsession
.clients
),
356 be32toh(lsession
.live_timer
));
358 if ((strncmp(lsession
.session_name
, ctx
->session_name
,
359 MAXNAMLEN
) == 0) && (strncmp(lsession
.hostname
,
360 ctx
->traced_hostname
, MAXNAMLEN
) == 0)) {
361 printf_verbose("Reading from session %" PRIu64
"\n",
363 g_array_append_val(ctx
->session_ids
,
370 print_session_list(session_list
, path
);
371 free_session_list(session_list
);
378 fprintf(stderr
, "[error] Unable to list sessions\n");
382 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream
*stream
,
383 uint64_t ctf_trace_id
)
385 struct lttng_live_ctf_trace
*trace
;
388 trace
= g_hash_table_lookup(stream
->session
->ctf_traces
,
391 trace
= g_new0(struct lttng_live_ctf_trace
, 1);
392 trace
->ctf_trace_id
= ctf_trace_id
;
393 trace
->streams
= g_ptr_array_new();
394 g_hash_table_insert(stream
->session
->ctf_traces
,
395 &trace
->ctf_trace_id
,
398 if (stream
->metadata_flag
)
399 trace
->metadata_stream
= stream
;
401 stream
->ctf_trace
= trace
;
402 g_ptr_array_add(trace
->streams
, stream
);
408 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
409 char **metadata_buf
, size_t *size
)
413 stream
->metadata_fp_write
=
414 babeltrace_open_memstream(metadata_buf
, size
);
415 if (!stream
->metadata_fp_write
) {
416 perror("Metadata open_memstream");
423 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
425 struct lttng_viewer_cmd cmd
;
426 struct lttng_viewer_attach_session_request rq
;
427 struct lttng_viewer_attach_session_response rp
;
428 struct lttng_viewer_stream stream
;
429 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
430 char cmd_buf
[cmd_buf_len
];
434 if (lttng_live_should_quit()) {
439 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
440 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
441 cmd
.cmd_version
= htobe32(0);
443 memset(&rq
, 0, sizeof(rq
));
444 rq
.session_id
= htobe64(id
);
445 // TODO: add cmd line parameter to select seek beginning
446 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
447 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
450 * Merge the cmd and connection request to prevent a write-write
451 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
452 * second write to be performed quickly in presence of Nagle's algorithm.
454 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
455 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
457 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
459 perror("[error] Error sending attach command and request");
462 assert(ret_len
== cmd_buf_len
);
464 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
466 fprintf(stderr
, "[error] Remote side has closed connection\n");
470 perror("[error] Error receiving attach response");
473 assert(ret_len
== sizeof(rp
));
475 switch(be32toh(rp
.status
)) {
476 case LTTNG_VIEWER_ATTACH_OK
:
478 case LTTNG_VIEWER_ATTACH_UNK
:
479 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
481 case LTTNG_VIEWER_ATTACH_ALREADY
:
482 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
484 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
485 fprintf(stderr
, "[error] Not a live session\n");
487 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
488 fprintf(stderr
, "[error] Wrong seek parameter\n");
491 fprintf(stderr
, "[error] Unknown attach return code %u\n",
495 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
499 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
501 * When the session is created but not started, we do an active wait
502 * until it starts. It allows the viewer to start processing the trace
503 * as soon as the session starts.
505 if (ctx
->session
->stream_count
== 0) {
509 printf_verbose("Waiting for %" PRIu64
" streams:\n",
510 ctx
->session
->stream_count
);
511 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
512 ctx
->session
->stream_count
);
513 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
514 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
516 fprintf(stderr
, "[error] Remote side has closed connection\n");
520 perror("[error] Error receiving stream");
523 assert(ret_len
== sizeof(stream
));
524 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
525 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
527 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
528 be64toh(stream
.id
), stream
.path_name
,
529 stream
.channel_name
);
530 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
531 ctx
->session
->streams
[i
].session
= ctx
->session
;
533 ctx
->session
->streams
[i
].mmap_size
= 0;
534 ctx
->session
->streams
[i
].ctf_stream_id
= -1ULL;
536 if (be32toh(stream
.metadata_flag
)) {
537 ctx
->session
->streams
[i
].metadata_flag
= 1;
539 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
540 be64toh(stream
.ctf_trace_id
));
555 * Ask the relay for new streams.
557 * Returns the number of new streams received or a negative value on error.
560 int ask_new_streams(struct lttng_live_ctx
*ctx
)
562 int i
, ret
= 0, nb_streams
= 0;
566 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
567 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
568 ret
= lttng_live_get_new_streams(ctx
, id
);
569 printf_verbose("Asking for new streams returns %d\n", ret
);
571 if (lttng_live_should_quit()) {
574 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
575 printf_verbose("Session %" PRIu64
" closed\n",
578 * The streams have already been closed during
579 * the reading, so we only need to get rid of
580 * the trace in our internal table of sessions.
582 g_array_remove_index(ctx
->session_ids
, i
);
584 * We can't continue iterating on the g_array
585 * after a remove, we have to start again.
603 int append_metadata(struct lttng_live_ctx
*ctx
,
604 struct lttng_live_viewer_stream
*viewer_stream
)
607 struct lttng_live_viewer_stream
*metadata
;
608 char *metadata_buf
= NULL
;
610 printf_verbose("get_next_index: new metadata needed\n");
611 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
617 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
618 metadata
->ctf_trace
->metadata_fp
=
619 babeltrace_fmemopen(metadata_buf
,
620 metadata
->metadata_len
, "rb");
621 if (!metadata
->ctf_trace
->metadata_fp
) {
622 perror("Metadata fmemopen");
627 ret
= ctf_append_trace_metadata(
628 viewer_stream
->ctf_trace
->handle
->td
,
629 metadata
->ctf_trace
->metadata_fp
);
630 /* We accept empty metadata packets */
631 if (ret
!= 0 && ret
!= -ENOENT
) {
632 fprintf(stderr
, "[error] Appending metadata\n");
642 int get_data_packet(struct lttng_live_ctx
*ctx
,
643 struct ctf_stream_pos
*pos
,
644 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
647 struct lttng_viewer_cmd cmd
;
648 struct lttng_viewer_get_packet rq
;
649 struct lttng_viewer_trace_packet rp
;
650 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
651 char cmd_buf
[cmd_buf_len
];
656 if (lttng_live_should_quit()) {
661 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
662 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
663 cmd
.cmd_version
= htobe32(0);
665 memset(&rq
, 0, sizeof(rq
));
666 rq
.stream_id
= htobe64(stream
->id
);
667 rq
.offset
= htobe64(offset
);
668 rq
.len
= htobe32(len
);
671 * Merge the cmd and connection request to prevent a write-write
672 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
673 * second write to be performed quickly in presence of Nagle's algorithm.
675 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
676 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
678 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
680 perror("[error] Error sending get_data_packet cmd and request");
683 assert(ret_len
== cmd_buf_len
);
685 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
687 fprintf(stderr
, "[error] Remote side has closed connection\n");
691 perror("[error] Error receiving data response");
694 if (ret_len
!= sizeof(rp
)) {
695 fprintf(stderr
, "[error] get_data_packet: expected %zu"
696 ", received %zd\n", sizeof(rp
),
701 rp
.flags
= be32toh(rp
.flags
);
703 switch (be32toh(rp
.status
)) {
704 case LTTNG_VIEWER_GET_PACKET_OK
:
705 len
= be32toh(rp
.len
);
706 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
709 case LTTNG_VIEWER_GET_PACKET_RETRY
:
710 /* Unimplemented by relay daemon */
711 printf_verbose("get_data_packet: retry\n");
713 case LTTNG_VIEWER_GET_PACKET_ERR
:
714 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
715 printf_verbose("get_data_packet: new metadata needed\n");
716 ret
= append_metadata(ctx
, stream
);
720 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
721 printf_verbose("get_data_packet: new streams needed\n");
722 ret
= ask_new_streams(ctx
);
725 } else if (ret
> 0) {
726 ret
= add_traces(ctx
);
732 if (rp
.flags
& (LTTNG_VIEWER_FLAG_NEW_METADATA
733 | LTTNG_VIEWER_FLAG_NEW_STREAM
)) {
736 fprintf(stderr
, "[error] get_data_packet: error\n");
738 case LTTNG_VIEWER_GET_PACKET_EOF
:
742 printf_verbose("get_data_packet: unknown\n");
750 if (len
> stream
->mmap_size
) {
753 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
756 ret
= munmap_align(pos
->base_mma
);
758 perror("[error] Unable to unmap old base");
761 pos
->base_mma
= NULL
;
763 pos
->base_mma
= mmap_align(new_size
,
764 PROT_READ
| PROT_WRITE
,
765 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
766 if (pos
->base_mma
== MAP_FAILED
) {
767 perror("[error] mmap error");
768 pos
->base_mma
= NULL
;
772 stream
->mmap_size
= new_size
;
773 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
777 ret_len
= lttng_live_recv(ctx
->control_sock
,
778 mmap_align_addr(pos
->base_mma
), len
);
780 fprintf(stderr
, "[error] Remote side has closed connection\n");
784 perror("[error] Error receiving trace packet");
787 assert(ret_len
== len
);
797 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
798 struct lttng_live_viewer_stream
*metadata_stream
)
802 struct lttng_viewer_cmd cmd
;
803 struct lttng_viewer_get_metadata rq
;
804 struct lttng_viewer_metadata_packet rp
;
807 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
808 char cmd_buf
[cmd_buf_len
];
810 if (lttng_live_should_quit()) {
815 rq
.stream_id
= htobe64(metadata_stream
->id
);
816 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
817 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
818 cmd
.cmd_version
= htobe32(0);
821 * Merge the cmd and connection request to prevent a write-write
822 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
823 * second write to be performed quickly in presence of Nagle's algorithm.
825 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
826 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
828 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
830 perror("[error] Error sending get_metadata cmd and request");
833 assert(ret_len
== cmd_buf_len
);
835 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
837 fprintf(stderr
, "[error] Remote side has closed connection\n");
841 perror("[error] Error receiving metadata response");
844 assert(ret_len
== sizeof(rp
));
846 switch (be32toh(rp
.status
)) {
847 case LTTNG_VIEWER_METADATA_OK
:
848 printf_verbose("get_metadata : OK\n");
850 case LTTNG_VIEWER_NO_NEW_METADATA
:
851 printf_verbose("get_metadata : NO NEW\n");
854 case LTTNG_VIEWER_METADATA_ERR
:
855 printf_verbose("get_metadata : ERR\n");
858 printf_verbose("get_metadata : UNKNOWN\n");
862 len
= be64toh(rp
.len
);
863 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
870 perror("relay data zmalloc");
873 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
875 fprintf(stderr
, "[error] Remote side has closed connection\n");
876 goto error_free_data
;
879 perror("[error] Error receiving trace packet");
880 goto error_free_data
;
882 assert(ret_len
== len
);
885 ret_len
= fwrite(data
, 1, len
,
886 metadata_stream
->metadata_fp_write
);
887 } while (ret_len
< 0 && errno
== EINTR
);
889 fprintf(stderr
, "[error] Writing in the metadata fp\n");
890 goto error_free_data
;
892 assert(ret_len
== len
);
893 metadata_stream
->metadata_len
+= len
;
906 * Return 0 on success, a negative value on error.
909 int get_new_metadata(struct lttng_live_ctx
*ctx
,
910 struct lttng_live_viewer_stream
*viewer_stream
,
914 struct lttng_live_viewer_stream
*metadata_stream
;
915 size_t size
, len_read
= 0;
917 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
918 if (!metadata_stream
) {
919 fprintf(stderr
, "[error] No metadata stream\n");
923 metadata_stream
->metadata_len
= 0;
924 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
930 if (lttng_live_should_quit()) {
935 * get_one_metadata_packet returns the number of bytes
936 * received, 0 when we have received everything, a
937 * negative value on error.
939 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
944 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
946 } while (ret
> 0 || !len_read
);
948 if (babeltrace_close_memstream(metadata_buf
, &size
,
949 metadata_stream
->metadata_fp_write
)) {
950 perror("babeltrace_close_memstream");
952 metadata_stream
->metadata_fp_write
= NULL
;
959 * Assign the fields from a lttng_viewer_index to a packet_index.
962 void lttng_index_to_packet_index(struct lttng_viewer_index
*lindex
,
963 struct packet_index
*pindex
)
968 pindex
->offset
= be64toh(lindex
->offset
);
969 pindex
->packet_size
= be64toh(lindex
->packet_size
);
970 pindex
->content_size
= be64toh(lindex
->content_size
);
971 pindex
->ts_cycles
.timestamp_begin
= be64toh(lindex
->timestamp_begin
);
972 pindex
->ts_cycles
.timestamp_end
= be64toh(lindex
->timestamp_end
);
973 pindex
->events_discarded
= be64toh(lindex
->events_discarded
);
977 * Get one index for a stream.
979 * Returns 0 on success or a negative value on error.
982 int get_next_index(struct lttng_live_ctx
*ctx
,
983 struct lttng_live_viewer_stream
*viewer_stream
,
984 struct packet_index
*index
, uint64_t *stream_id
)
986 struct lttng_viewer_cmd cmd
;
987 struct lttng_viewer_get_next_index rq
;
990 struct lttng_viewer_index
*rp
= &viewer_stream
->current_index
;
991 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
992 char cmd_buf
[cmd_buf_len
];
994 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
995 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
996 cmd
.cmd_version
= htobe32(0);
998 memset(&rq
, 0, sizeof(rq
));
999 rq
.stream_id
= htobe64(viewer_stream
->id
);
1002 * Merge the cmd and connection request to prevent a write-write
1003 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1004 * second write to be performed quickly in presence of Nagle's algorithm.
1006 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1007 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1009 if (lttng_live_should_quit()) {
1013 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd_buf
, cmd_buf_len
);
1015 perror("[error] Error sending get_next_index cmd and request");
1018 assert(ret_len
== cmd_buf_len
);
1020 ret_len
= lttng_live_recv(ctx
->control_sock
, rp
, sizeof(*rp
));
1022 fprintf(stderr
, "[error] Remote side has closed connection\n");
1026 perror("[error] Error receiving index response");
1029 assert(ret_len
== sizeof(*rp
));
1031 rp
->flags
= be32toh(rp
->flags
);
1033 switch (be32toh(rp
->status
)) {
1034 case LTTNG_VIEWER_INDEX_INACTIVE
:
1035 printf_verbose("get_next_index: inactive\n");
1037 if (index
->ts_cycles
.timestamp_end
==
1038 be64toh(rp
->timestamp_end
)) {
1039 /* Already seen this timestamp. */
1040 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1043 memset(index
, 0, sizeof(struct packet_index
));
1044 index
->ts_cycles
.timestamp_end
= be64toh(rp
->timestamp_end
);
1045 *stream_id
= be64toh(rp
->stream_id
);
1047 case LTTNG_VIEWER_INDEX_OK
:
1048 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1049 rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
1050 lttng_index_to_packet_index(rp
, index
);
1051 *stream_id
= be64toh(rp
->stream_id
);
1052 viewer_stream
->data_pending
= 1;
1054 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
1055 ret
= append_metadata(ctx
, viewer_stream
);
1059 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
1060 printf_verbose("get_next_index: need new streams\n");
1061 ret
= ask_new_streams(ctx
);
1064 } else if (ret
> 0) {
1065 ret
= add_traces(ctx
);
1072 case LTTNG_VIEWER_INDEX_RETRY
:
1073 printf_verbose("get_next_index: retry\n");
1074 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1076 case LTTNG_VIEWER_INDEX_HUP
:
1077 printf_verbose("get_next_index: stream hung up\n");
1078 viewer_stream
->id
= -1ULL;
1079 index
->offset
= EOF
;
1080 ctx
->session
->stream_count
--;
1082 case LTTNG_VIEWER_INDEX_ERR
:
1083 fprintf(stderr
, "[error] get_next_index: error\n");
1086 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1098 void read_packet_header(struct ctf_stream_pos
*pos
,
1099 struct ctf_file_stream
*file_stream
)
1103 /* update trace_packet_header and stream_packet_context */
1104 if (!(pos
->prot
& PROT_WRITE
) &&
1105 file_stream
->parent
.trace_packet_header
) {
1106 /* Read packet header */
1107 ret
= generic_rw(&pos
->parent
,
1108 &file_stream
->parent
.trace_packet_header
->p
);
1111 fprintf(stderr
, "[error] trace packet "
1112 "header read failed\n");
1116 if (!(pos
->prot
& PROT_WRITE
) &&
1117 file_stream
->parent
.stream_packet_context
) {
1118 /* Read packet context */
1119 ret
= generic_rw(&pos
->parent
,
1120 &file_stream
->parent
.stream_packet_context
->p
);
1123 fprintf(stderr
, "[error] stream packet "
1124 "context read failed\n");
1128 pos
->data_offset
= pos
->offset
;
1135 * Handle the seek parameters.
1136 * Returns 0 if the packet_seek can continue, a positive value to
1137 * cleanly exit the packet_seek, a negative value on error.
1140 int handle_seek_position(size_t index
, int whence
,
1141 struct lttng_live_viewer_stream
*viewer_stream
,
1142 struct ctf_stream_pos
*pos
,
1143 struct ctf_file_stream
*file_stream
)
1153 * We only allow to seek to 0.
1156 fprintf(stderr
, "[error] Arbitrary seek in lttng-live "
1157 "trace not supported\n");
1167 fprintf(stderr
, "[error] Invalid seek parameter\n");
1176 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1179 struct ctf_stream_pos
*pos
;
1180 struct ctf_file_stream
*file_stream
;
1181 struct packet_index
*prev_index
= NULL
, *cur_index
;
1182 struct lttng_live_viewer_stream
*viewer_stream
;
1183 struct lttng_live_session
*session
;
1184 uint64_t stream_id
= -1ULL;
1187 pos
= ctf_pos(stream_pos
);
1188 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1189 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1190 session
= viewer_stream
->session
;
1192 ret
= handle_seek_position(index
, whence
, viewer_stream
, pos
,
1199 switch (pos
->packet_index
->len
) {
1201 g_array_set_size(pos
->packet_index
, 1);
1202 cur_index
= &g_array_index(pos
->packet_index
,
1203 struct packet_index
, 0);
1206 g_array_set_size(pos
->packet_index
, 2);
1207 prev_index
= &g_array_index(pos
->packet_index
,
1208 struct packet_index
, 0);
1209 cur_index
= &g_array_index(pos
->packet_index
,
1210 struct packet_index
, 1);
1213 g_array_index(pos
->packet_index
,
1214 struct packet_index
, 0) =
1215 g_array_index(pos
->packet_index
,
1216 struct packet_index
, 1);
1217 prev_index
= &g_array_index(pos
->packet_index
,
1218 struct packet_index
, 0);
1219 cur_index
= &g_array_index(pos
->packet_index
,
1220 struct packet_index
, 1);
1227 if (viewer_stream
->data_pending
) {
1228 lttng_index_to_packet_index(&viewer_stream
->current_index
, cur_index
);
1230 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1231 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
, &stream_id
);
1234 if (!lttng_live_should_quit()) {
1235 fprintf(stderr
, "[error] get_next_index failed\n");
1239 printf_verbose("Index received : packet_size : %" PRIu64
1240 ", offset %" PRIu64
", content_size %" PRIu64
1241 ", timestamp_end : %" PRIu64
"\n",
1242 cur_index
->packet_size
, cur_index
->offset
,
1243 cur_index
->content_size
,
1244 cur_index
->ts_cycles
.timestamp_end
);
1249 * On the first time we receive an index, the stream_id needs to
1250 * be set for the stream in order to use it, we don't want any
1251 * data at this stage.
1253 if (file_stream
->parent
.stream_id
== -1ULL) {
1255 * Warning: with lttng-tools < 2.4.2, the beacon does not
1256 * contain the real stream ID, it is memset to 0, so this
1257 * might create a problem when a session has multiple
1258 * channels. We can't detect it at this stage, lttng-tools
1259 * has to be upgraded to fix this problem.
1261 printf_verbose("Assigning stream_id %" PRIu64
"\n",
1263 file_stream
->parent
.stream_id
= stream_id
;
1264 viewer_stream
->ctf_stream_id
= stream_id
;
1269 pos
->packet_size
= cur_index
->packet_size
;
1270 pos
->content_size
= cur_index
->content_size
;
1271 pos
->mmap_base_offset
= 0;
1272 if (cur_index
->offset
== EOF
) {
1278 if (cur_index
->content_size
== 0) {
1279 if (file_stream
->parent
.stream_class
) {
1280 file_stream
->parent
.cycles_timestamp
=
1281 cur_index
->ts_cycles
.timestamp_end
;
1282 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1283 &file_stream
->parent
,
1284 cur_index
->ts_cycles
.timestamp_end
);
1287 if (file_stream
->parent
.stream_class
) {
1288 /* Convert the timestamps and append to the real_index. */
1289 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1290 &file_stream
->parent
,
1291 cur_index
->ts_cycles
.timestamp_begin
);
1292 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1293 &file_stream
->parent
,
1294 cur_index
->ts_cycles
.timestamp_end
);
1297 ctf_update_current_packet_index(&file_stream
->parent
,
1298 prev_index
, cur_index
);
1300 file_stream
->parent
.cycles_timestamp
=
1301 cur_index
->ts_cycles
.timestamp_begin
;
1302 file_stream
->parent
.real_timestamp
=
1303 cur_index
->ts_real
.timestamp_begin
;
1307 * Flush the output between attempts to grab a packet, thus
1308 * ensuring we flush at least at the periodical timer period.
1309 * This ensures the output remains reactive for interactive users and
1310 * that the output is flushed when redirected to a file by the shell.
1312 if (fflush(LTTNG_LIVE_OUTPUT_FP
) < 0) {
1317 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1321 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1323 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1325 cur_index
->packet_size
/ CHAR_BIT
);
1328 } else if (ret
< 0) {
1330 if (!lttng_live_should_quit()) {
1331 fprintf(stderr
, "[error] get_data_packet failed\n");
1335 viewer_stream
->data_pending
= 0;
1337 read_packet_header(pos
, file_stream
);
1343 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1345 struct lttng_viewer_cmd cmd
;
1346 struct lttng_viewer_create_session_response resp
;
1350 if (lttng_live_should_quit()) {
1355 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1356 cmd
.data_size
= htobe64((uint64_t) 0);
1357 cmd
.cmd_version
= htobe32(0);
1359 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1361 perror("[error] Error sending cmd");
1364 assert(ret_len
== sizeof(cmd
));
1366 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1368 fprintf(stderr
, "[error] Remote side has closed connection\n");
1372 perror("[error] Error receiving create session reply");
1375 assert(ret_len
== sizeof(resp
));
1377 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1378 fprintf(stderr
, "[error] Error creating viewer session\n");
1390 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1392 struct bt_context
*bt_ctx
= user_data
;
1393 struct lttng_live_ctf_trace
*trace
= value
;
1396 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1398 fprintf(stderr
, "[error] removing trace from context\n");
1400 /* remove the key/value pair from the HT. */
1405 int add_one_trace(struct lttng_live_ctx
*ctx
,
1406 struct lttng_live_ctf_trace
*trace
)
1409 struct bt_context
*bt_ctx
= ctx
->bt_ctx
;
1410 struct lttng_live_viewer_stream
*stream
;
1411 struct bt_mmap_stream
*new_mmap_stream
;
1412 struct bt_mmap_stream_list mmap_list
;
1413 struct bt_trace_descriptor
*td
;
1414 struct bt_trace_handle
*handle
;
1417 * We don't know how many streams we will receive for a trace, so
1418 * once we are done receiving the traces, we add all the traces
1419 * received to the bt_context.
1420 * We can receive streams during the attach command or the
1421 * get_new_streams, so we have to make sure not to add multiple
1422 * times the same traces.
1423 * If a trace is already in the context, we just skip this function.
1425 if (trace
->in_use
) {
1430 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1432 for (i
= 0; i
< trace
->streams
->len
; i
++) {
1433 stream
= g_ptr_array_index(trace
->streams
, i
);
1435 if (!stream
->metadata_flag
) {
1436 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1437 new_mmap_stream
->priv
= (void *) stream
;
1438 new_mmap_stream
->fd
= -1;
1439 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1441 char *metadata_buf
= NULL
;
1443 /* Get all possible metadata before starting */
1444 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1449 if (!stream
->metadata_len
) {
1450 fprintf(stderr
, "[error] empty metadata\n");
1456 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1457 stream
->metadata_len
, "rb");
1458 if (!trace
->metadata_fp
) {
1459 perror("Metadata fmemopen");
1467 if (!trace
->metadata_fp
) {
1468 fprintf(stderr
, "[error] No metadata stream opened\n");
1473 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1474 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1476 fprintf(stderr
, "[error] Error adding trace\n");
1480 trace
->metadata_stream
->metadata_len
= 0;
1482 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1483 bt_ctx
->trace_handles
,
1484 (gpointer
) (unsigned long) ret
);
1486 trace
->handle
= handle
;
1487 if (bt_ctx
->current_iterator
) {
1488 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1491 trace
->trace_id
= ret
;
1497 bt_context_put(bt_ctx
);
1503 int add_traces(struct lttng_live_ctx
*ctx
)
1506 struct lttng_live_ctf_trace
*trace
;
1511 g_hash_table_iter_init(&it
, ctx
->session
->ctf_traces
);
1512 while (g_hash_table_iter_next(&it
, &key
, &value
)) {
1513 trace
= (struct lttng_live_ctf_trace
*) value
;
1514 ret
= add_one_trace(ctx
, trace
);
1527 * Request new streams for a session.
1528 * Returns the number of streams received or a negative value on error.
1530 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1532 struct lttng_viewer_cmd cmd
;
1533 struct lttng_viewer_new_streams_request rq
;
1534 struct lttng_viewer_new_streams_response rp
;
1535 struct lttng_viewer_stream stream
;
1536 int ret
, i
, nb_streams
= 0;
1538 uint32_t stream_count
;
1539 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
1540 char cmd_buf
[cmd_buf_len
];
1542 if (lttng_live_should_quit()) {
1547 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1548 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
1549 cmd
.cmd_version
= htobe32(0);
1551 memset(&rq
, 0, sizeof(rq
));
1552 rq
.session_id
= htobe64(id
);
1555 * Merge the cmd and connection request to prevent a write-write
1556 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1557 * second write to be performed quickly in presence of Nagle's algorithm.
1559 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1560 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1562 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
1564 perror("[error] Error sending get_new_streams cmd and request");
1567 assert(ret_len
== cmd_buf_len
);
1569 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1571 fprintf(stderr
, "[error] Remote side has closed connection\n");
1575 perror("[error] Error receiving get_new_streams response");
1578 assert(ret_len
== sizeof(rp
));
1580 switch(be32toh(rp
.status
)) {
1581 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1583 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1586 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1587 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1589 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1590 fprintf(stderr
, "[error] get_new_streams error\n");
1593 fprintf(stderr
, "[error] Unknown return code %u\n",
1594 be32toh(rp
.status
));
1598 stream_count
= be32toh(rp
.streams_count
);
1599 ctx
->session
->stream_count
+= stream_count
;
1601 * When the session is created but not started, we do an active wait
1602 * until it starts. It allows the viewer to start processing the trace
1603 * as soon as the session starts.
1605 if (ctx
->session
->stream_count
== 0) {
1609 printf_verbose("Waiting for %" PRIu64
" streams:\n",
1610 ctx
->session
->stream_count
);
1611 ctx
->session
->streams
= g_new0(struct lttng_live_viewer_stream
,
1612 ctx
->session
->stream_count
);
1613 for (i
= 0; i
< stream_count
; i
++) {
1614 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
, sizeof(stream
));
1616 fprintf(stderr
, "[error] Remote side has closed connection\n");
1620 perror("[error] Error receiving stream");
1623 assert(ret_len
== sizeof(stream
));
1624 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1625 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1627 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1628 be64toh(stream
.id
), stream
.path_name
,
1629 stream
.channel_name
);
1630 ctx
->session
->streams
[i
].id
= be64toh(stream
.id
);
1631 ctx
->session
->streams
[i
].session
= ctx
->session
;
1633 ctx
->session
->streams
[i
].mmap_size
= 0;
1634 ctx
->session
->streams
[i
].ctf_stream_id
= -1ULL;
1636 if (be32toh(stream
.metadata_flag
)) {
1637 ctx
->session
->streams
[i
].metadata_flag
= 1;
1639 ret
= lttng_live_ctf_trace_assign(&ctx
->session
->streams
[i
],
1640 be64toh(stream
.ctf_trace_id
));
1655 int lttng_live_read(struct lttng_live_ctx
*ctx
)
1659 struct bt_ctf_iter
*iter
;
1660 const struct bt_ctf_event
*event
;
1661 struct bt_iter_pos begin_pos
;
1662 struct bt_trace_descriptor
*td_write
;
1663 struct bt_format
*fmt_write
;
1664 struct ctf_text_stream_pos
*sout
;
1667 ctx
->bt_ctx
= bt_context_create();
1669 fprintf(stderr
, "[error] bt_context_create allocation\n");
1673 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1675 fprintf(stderr
, "[error] ctf-text error\n");
1679 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1681 fprintf(stderr
, "[error] Error opening output trace\n");
1685 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1687 if (!sout
->parent
.event_cb
) {
1691 ret
= lttng_live_create_viewer_session(ctx
);
1696 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1697 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1698 printf_verbose("Attaching to session %" PRIu64
"\n", id
);
1699 ret
= lttng_live_attach_session(ctx
, id
);
1700 printf_verbose("Attaching session returns %d\n", ret
);
1702 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1703 fprintf(stderr
, "[error] Unknown session ID\n");
1710 * As long as the session is active, we try to get new streams.
1715 if (lttng_live_should_quit()) {
1720 while (!ctx
->session
->stream_count
) {
1721 if (lttng_live_should_quit()
1722 || ctx
->session_ids
->len
== 0) {
1726 ret
= ask_new_streams(ctx
);
1730 if (!ctx
->session
->stream_count
) {
1731 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1735 ret
= add_traces(ctx
);
1740 begin_pos
.type
= BT_SEEK_BEGIN
;
1741 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1743 if (lttng_live_should_quit()) {
1747 fprintf(stderr
, "[error] Iterator creation error\n");
1751 if (lttng_live_should_quit()) {
1755 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1756 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1761 ret
= sout
->parent
.event_cb(&sout
->parent
,
1762 event
->parent
->stream
);
1764 fprintf(stderr
, "[error] Writing "
1769 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1774 bt_ctf_iter_destroy(iter
);
1775 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1776 del_traces
, ctx
->bt_ctx
);
1777 ctx
->session
->stream_count
= 0;
1781 bt_context_put(ctx
->bt_ctx
);
1783 if (lttng_live_should_quit()) {