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
->trace_id
= -1;
394 printf_verbose("Create trace ctf_trace_id %" PRIu64
"\n", ctf_trace_id
);
395 BT_INIT_LIST_HEAD(&trace
->stream_list
);
396 g_hash_table_insert(stream
->session
->ctf_traces
,
397 &trace
->ctf_trace_id
,
400 if (stream
->metadata_flag
)
401 trace
->metadata_stream
= stream
;
403 assert(!stream
->in_trace
);
404 stream
->in_trace
= 1;
405 stream
->ctf_trace
= trace
;
406 bt_list_add(&stream
->trace_stream_node
, &trace
->stream_list
);
412 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
413 char **metadata_buf
, size_t *size
)
417 stream
->metadata_fp_write
=
418 babeltrace_open_memstream(metadata_buf
, size
);
419 if (!stream
->metadata_fp_write
) {
420 perror("Metadata open_memstream");
427 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
429 struct lttng_viewer_cmd cmd
;
430 struct lttng_viewer_attach_session_request rq
;
431 struct lttng_viewer_attach_session_response rp
;
432 struct lttng_viewer_stream stream
;
433 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
434 char cmd_buf
[cmd_buf_len
];
438 if (lttng_live_should_quit()) {
443 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
444 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
445 cmd
.cmd_version
= htobe32(0);
447 memset(&rq
, 0, sizeof(rq
));
448 rq
.session_id
= htobe64(id
);
449 // TODO: add cmd line parameter to select seek beginning
450 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
451 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
454 * Merge the cmd and connection request to prevent a write-write
455 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
456 * second write to be performed quickly in presence of Nagle's algorithm.
458 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
459 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
461 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
463 perror("[error] Error sending attach command and request");
466 assert(ret_len
== cmd_buf_len
);
468 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
470 fprintf(stderr
, "[error] Remote side has closed connection\n");
474 perror("[error] Error receiving attach response");
477 assert(ret_len
== sizeof(rp
));
479 switch(be32toh(rp
.status
)) {
480 case LTTNG_VIEWER_ATTACH_OK
:
482 case LTTNG_VIEWER_ATTACH_UNK
:
483 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
485 case LTTNG_VIEWER_ATTACH_ALREADY
:
486 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
488 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
489 fprintf(stderr
, "[error] Not a live session\n");
491 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
492 fprintf(stderr
, "[error] Wrong seek parameter\n");
495 fprintf(stderr
, "[error] Unknown attach return code %u\n",
499 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
503 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
505 * When the session is created but not started, we do an active wait
506 * until it starts. It allows the viewer to start processing the trace
507 * as soon as the session starts.
509 if (ctx
->session
->stream_count
== 0) {
513 printf_verbose("Waiting for %d streams:\n",
514 be32toh(rp
.streams_count
));
515 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
516 struct lttng_live_viewer_stream
*lvstream
;
518 lvstream
= g_new0(struct lttng_live_viewer_stream
, 1);
519 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
,
522 fprintf(stderr
, "[error] Remote side has closed connection\n");
527 perror("[error] Error receiving stream");
531 assert(ret_len
== sizeof(stream
));
532 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
533 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
535 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
536 be64toh(stream
.id
), stream
.path_name
,
537 stream
.channel_name
);
538 lvstream
->id
= be64toh(stream
.id
);
539 lvstream
->session
= ctx
->session
;
541 lvstream
->mmap_size
= 0;
542 lvstream
->ctf_stream_id
= -1ULL;
544 if (be32toh(stream
.metadata_flag
)) {
545 lvstream
->metadata_flag
= 1;
547 ret
= lttng_live_ctf_trace_assign(lvstream
,
548 be64toh(stream
.ctf_trace_id
));
553 bt_list_add(&lvstream
->session_stream_node
,
554 &ctx
->session
->stream_list
);
565 * Ask the relay for new streams.
567 * Returns the number of new streams received or a negative value on error.
570 int ask_new_streams(struct lttng_live_ctx
*ctx
)
572 int i
, ret
= 0, nb_streams
= 0;
576 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
577 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
578 ret
= lttng_live_get_new_streams(ctx
, id
);
579 printf_verbose("Asking for new streams returns %d\n", ret
);
580 if (lttng_live_should_quit()) {
585 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
586 printf_verbose("Session %" PRIu64
" closed\n",
589 * The streams have already been closed during
590 * the reading, so we only need to get rid of
591 * the trace in our internal table of sessions.
593 g_array_remove_index(ctx
->session_ids
, i
);
595 * We can't continue iterating on the g_array
596 * after a remove, we have to start again.
607 if (ctx
->session_ids
->len
== 0) {
608 /* All sessions are closed. */
619 int append_metadata(struct lttng_live_ctx
*ctx
,
620 struct lttng_live_viewer_stream
*viewer_stream
)
623 struct lttng_live_viewer_stream
*metadata
;
624 char *metadata_buf
= NULL
;
626 if (!viewer_stream
->ctf_trace
->handle
) {
627 printf_verbose("append_metadata: trace handle not ready yet.\n");
631 printf_verbose("get_next_index: new metadata needed\n");
632 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
638 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
639 metadata
->ctf_trace
->metadata_fp
=
640 babeltrace_fmemopen(metadata_buf
,
641 metadata
->metadata_len
, "rb");
642 if (!metadata
->ctf_trace
->metadata_fp
) {
643 perror("Metadata fmemopen");
648 ret
= ctf_append_trace_metadata(
649 viewer_stream
->ctf_trace
->handle
->td
,
650 metadata
->ctf_trace
->metadata_fp
);
651 /* We accept empty metadata packets */
652 if (ret
!= 0 && ret
!= -ENOENT
) {
653 fprintf(stderr
, "[error] Appending metadata\n");
663 int get_data_packet(struct lttng_live_ctx
*ctx
,
664 struct ctf_stream_pos
*pos
,
665 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
668 struct lttng_viewer_cmd cmd
;
669 struct lttng_viewer_get_packet rq
;
670 struct lttng_viewer_trace_packet rp
;
671 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
672 char cmd_buf
[cmd_buf_len
];
677 if (lttng_live_should_quit()) {
682 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
683 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
684 cmd
.cmd_version
= htobe32(0);
686 memset(&rq
, 0, sizeof(rq
));
687 rq
.stream_id
= htobe64(stream
->id
);
688 rq
.offset
= htobe64(offset
);
689 rq
.len
= htobe32(len
);
692 * Merge the cmd and connection request to prevent a write-write
693 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
694 * second write to be performed quickly in presence of Nagle's algorithm.
696 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
697 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
699 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
701 perror("[error] Error sending get_data_packet cmd and request");
704 assert(ret_len
== cmd_buf_len
);
706 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
708 fprintf(stderr
, "[error] Remote side has closed connection\n");
712 perror("[error] Error receiving data response");
715 if (ret_len
!= sizeof(rp
)) {
716 fprintf(stderr
, "[error] get_data_packet: expected %zu"
717 ", received %zd\n", sizeof(rp
),
722 rp
.flags
= be32toh(rp
.flags
);
724 switch (be32toh(rp
.status
)) {
725 case LTTNG_VIEWER_GET_PACKET_OK
:
726 len
= be32toh(rp
.len
);
727 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
730 case LTTNG_VIEWER_GET_PACKET_RETRY
:
731 /* Unimplemented by relay daemon */
732 printf_verbose("get_data_packet: retry\n");
734 case LTTNG_VIEWER_GET_PACKET_ERR
:
735 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
736 printf_verbose("get_data_packet: new metadata needed\n");
737 ret
= append_metadata(ctx
, stream
);
741 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
742 printf_verbose("get_data_packet: new streams needed\n");
743 ret
= ask_new_streams(ctx
);
746 } else if (ret
> 0) {
747 ret
= add_traces(ctx
);
753 if (rp
.flags
& (LTTNG_VIEWER_FLAG_NEW_METADATA
754 | LTTNG_VIEWER_FLAG_NEW_STREAM
)) {
757 fprintf(stderr
, "[error] get_data_packet: error\n");
759 case LTTNG_VIEWER_GET_PACKET_EOF
:
763 printf_verbose("get_data_packet: unknown\n");
771 if (len
> stream
->mmap_size
) {
774 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
777 ret
= munmap_align(pos
->base_mma
);
779 perror("[error] Unable to unmap old base");
782 pos
->base_mma
= NULL
;
784 pos
->base_mma
= mmap_align(new_size
,
785 PROT_READ
| PROT_WRITE
,
786 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
787 if (pos
->base_mma
== MAP_FAILED
) {
788 perror("[error] mmap error");
789 pos
->base_mma
= NULL
;
793 stream
->mmap_size
= new_size
;
794 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
798 ret_len
= lttng_live_recv(ctx
->control_sock
,
799 mmap_align_addr(pos
->base_mma
), len
);
801 fprintf(stderr
, "[error] Remote side has closed connection\n");
805 perror("[error] Error receiving trace packet");
808 assert(ret_len
== len
);
818 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
819 struct lttng_live_viewer_stream
*metadata_stream
)
823 struct lttng_viewer_cmd cmd
;
824 struct lttng_viewer_get_metadata rq
;
825 struct lttng_viewer_metadata_packet rp
;
828 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
829 char cmd_buf
[cmd_buf_len
];
831 if (lttng_live_should_quit()) {
836 rq
.stream_id
= htobe64(metadata_stream
->id
);
837 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
838 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
839 cmd
.cmd_version
= htobe32(0);
842 * Merge the cmd and connection request to prevent a write-write
843 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
844 * second write to be performed quickly in presence of Nagle's algorithm.
846 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
847 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
849 printf_verbose("get_metadata for trace_id: %d, ctf_trace_id: %" PRIu64
"\n",
850 metadata_stream
->ctf_trace
->trace_id
,
851 metadata_stream
->ctf_trace
->ctf_trace_id
);
852 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
854 perror("[error] Error sending get_metadata cmd and request");
857 assert(ret_len
== cmd_buf_len
);
859 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
861 fprintf(stderr
, "[error] Remote side has closed connection\n");
865 perror("[error] Error receiving metadata response");
868 assert(ret_len
== sizeof(rp
));
870 switch (be32toh(rp
.status
)) {
871 case LTTNG_VIEWER_METADATA_OK
:
872 printf_verbose("get_metadata : OK\n");
874 case LTTNG_VIEWER_NO_NEW_METADATA
:
875 printf_verbose("get_metadata : NO NEW\n");
878 case LTTNG_VIEWER_METADATA_ERR
:
879 printf_verbose("get_metadata : ERR\n");
882 printf_verbose("get_metadata : UNKNOWN\n");
886 len
= be64toh(rp
.len
);
887 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
894 perror("relay data zmalloc");
897 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
899 fprintf(stderr
, "[error] Remote side has closed connection\n");
900 goto error_free_data
;
903 perror("[error] Error receiving trace packet");
904 goto error_free_data
;
906 assert(ret_len
== len
);
909 ret_len
= fwrite(data
, 1, len
,
910 metadata_stream
->metadata_fp_write
);
911 } while (ret_len
< 0 && errno
== EINTR
);
913 fprintf(stderr
, "[error] Writing in the metadata fp\n");
914 goto error_free_data
;
916 assert(ret_len
== len
);
917 metadata_stream
->metadata_len
+= len
;
930 * Return 0 on success, a negative value on error.
933 int get_new_metadata(struct lttng_live_ctx
*ctx
,
934 struct lttng_live_viewer_stream
*viewer_stream
,
938 struct lttng_live_viewer_stream
*metadata_stream
;
939 size_t size
, len_read
= 0;
941 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
942 if (!metadata_stream
) {
943 fprintf(stderr
, "[error] No metadata stream\n");
947 metadata_stream
->metadata_len
= 0;
948 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
954 if (lttng_live_should_quit()) {
959 * get_one_metadata_packet returns the number of bytes
960 * received, 0 when we have received everything, a
961 * negative value on error.
963 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
968 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
971 break; /* Stop on error. */
973 } while (ret
> 0 || !len_read
);
975 if (babeltrace_close_memstream(metadata_buf
, &size
,
976 metadata_stream
->metadata_fp_write
)) {
977 perror("babeltrace_close_memstream");
979 metadata_stream
->metadata_fp_write
= NULL
;
986 * Assign the fields from a lttng_viewer_index to a packet_index.
989 void lttng_index_to_packet_index(struct lttng_viewer_index
*lindex
,
990 struct packet_index
*pindex
)
995 pindex
->offset
= be64toh(lindex
->offset
);
996 pindex
->packet_size
= be64toh(lindex
->packet_size
);
997 pindex
->content_size
= be64toh(lindex
->content_size
);
998 pindex
->ts_cycles
.timestamp_begin
= be64toh(lindex
->timestamp_begin
);
999 pindex
->ts_cycles
.timestamp_end
= be64toh(lindex
->timestamp_end
);
1000 pindex
->events_discarded
= be64toh(lindex
->events_discarded
);
1004 * Get one index for a stream.
1006 * Returns 0 on success or a negative value on error.
1009 int get_next_index(struct lttng_live_ctx
*ctx
,
1010 struct lttng_live_viewer_stream
*viewer_stream
,
1011 struct packet_index
*index
, uint64_t *stream_id
)
1013 struct lttng_viewer_cmd cmd
;
1014 struct lttng_viewer_get_next_index rq
;
1017 struct lttng_viewer_index
*rp
= &viewer_stream
->current_index
;
1018 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
1019 char cmd_buf
[cmd_buf_len
];
1021 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
1022 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
1023 cmd
.cmd_version
= htobe32(0);
1025 memset(&rq
, 0, sizeof(rq
));
1026 rq
.stream_id
= htobe64(viewer_stream
->id
);
1029 * Merge the cmd and connection request to prevent a write-write
1030 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1031 * second write to be performed quickly in presence of Nagle's algorithm.
1033 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1034 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1036 if (lttng_live_should_quit()) {
1040 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd_buf
, cmd_buf_len
);
1042 perror("[error] Error sending get_next_index cmd and request");
1045 assert(ret_len
== cmd_buf_len
);
1047 ret_len
= lttng_live_recv(ctx
->control_sock
, rp
, sizeof(*rp
));
1049 fprintf(stderr
, "[error] Remote side has closed connection\n");
1053 perror("[error] Error receiving index response");
1056 assert(ret_len
== sizeof(*rp
));
1058 rp
->flags
= be32toh(rp
->flags
);
1060 switch (be32toh(rp
->status
)) {
1061 case LTTNG_VIEWER_INDEX_INACTIVE
:
1062 printf_verbose("get_next_index: inactive\n");
1064 if (index
->ts_cycles
.timestamp_end
==
1065 be64toh(rp
->timestamp_end
)) {
1066 /* Already seen this timestamp. */
1067 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1070 memset(index
, 0, sizeof(struct packet_index
));
1071 index
->ts_cycles
.timestamp_end
= be64toh(rp
->timestamp_end
);
1072 *stream_id
= be64toh(rp
->stream_id
);
1074 case LTTNG_VIEWER_INDEX_OK
:
1075 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1076 rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
1077 lttng_index_to_packet_index(rp
, index
);
1078 *stream_id
= be64toh(rp
->stream_id
);
1079 viewer_stream
->data_pending
= 1;
1081 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
1082 ret
= append_metadata(ctx
, viewer_stream
);
1086 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
1087 printf_verbose("get_next_index: need new streams\n");
1088 ret
= ask_new_streams(ctx
);
1091 } else if (ret
> 0) {
1092 ret
= add_traces(ctx
);
1099 case LTTNG_VIEWER_INDEX_RETRY
:
1100 printf_verbose("get_next_index: retry\n");
1101 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1103 case LTTNG_VIEWER_INDEX_HUP
:
1104 printf_verbose("get_next_index: stream hung up\n");
1105 viewer_stream
->id
= -1ULL;
1106 index
->offset
= EOF
;
1107 ctx
->session
->stream_count
--;
1108 viewer_stream
->in_trace
= 0;
1109 bt_list_del(&viewer_stream
->trace_stream_node
);
1110 bt_list_del(&viewer_stream
->session_stream_node
);
1111 *stream_id
= be64toh(rp
->stream_id
);
1112 g_free(viewer_stream
);
1114 case LTTNG_VIEWER_INDEX_ERR
:
1115 fprintf(stderr
, "[error] get_next_index: error\n");
1118 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1130 void read_packet_header(struct ctf_stream_pos
*pos
,
1131 struct ctf_file_stream
*file_stream
)
1135 /* update trace_packet_header and stream_packet_context */
1136 if (!(pos
->prot
& PROT_WRITE
) &&
1137 file_stream
->parent
.trace_packet_header
) {
1138 /* Read packet header */
1139 ret
= generic_rw(&pos
->parent
,
1140 &file_stream
->parent
.trace_packet_header
->p
);
1143 fprintf(stderr
, "[error] trace packet "
1144 "header read failed\n");
1148 if (!(pos
->prot
& PROT_WRITE
) &&
1149 file_stream
->parent
.stream_packet_context
) {
1150 /* Read packet context */
1151 ret
= generic_rw(&pos
->parent
,
1152 &file_stream
->parent
.stream_packet_context
->p
);
1155 fprintf(stderr
, "[error] stream packet "
1156 "context read failed\n");
1160 pos
->data_offset
= pos
->offset
;
1167 * Handle the seek parameters.
1168 * Returns 0 if the packet_seek can continue, a positive value to
1169 * cleanly exit the packet_seek, a negative value on error.
1172 int handle_seek_position(size_t index
, int whence
,
1173 struct lttng_live_viewer_stream
*viewer_stream
,
1174 struct ctf_stream_pos
*pos
,
1175 struct ctf_file_stream
*file_stream
)
1185 * We only allow to seek to 0.
1188 fprintf(stderr
, "[error] Arbitrary seek in lttng-live "
1189 "trace not supported\n");
1199 fprintf(stderr
, "[error] Invalid seek parameter\n");
1208 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1211 struct ctf_stream_pos
*pos
;
1212 struct ctf_file_stream
*file_stream
;
1213 struct packet_index
*prev_index
= NULL
, *cur_index
;
1214 struct lttng_live_viewer_stream
*viewer_stream
;
1215 struct lttng_live_session
*session
;
1216 uint64_t stream_id
= -1ULL;
1219 pos
= ctf_pos(stream_pos
);
1220 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1221 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1222 session
= viewer_stream
->session
;
1224 ret
= handle_seek_position(index
, whence
, viewer_stream
, pos
,
1227 ret
= -BT_PACKET_SEEK_ERROR
;
1232 switch (pos
->packet_index
->len
) {
1234 g_array_set_size(pos
->packet_index
, 1);
1235 cur_index
= &g_array_index(pos
->packet_index
,
1236 struct packet_index
, 0);
1239 g_array_set_size(pos
->packet_index
, 2);
1240 prev_index
= &g_array_index(pos
->packet_index
,
1241 struct packet_index
, 0);
1242 cur_index
= &g_array_index(pos
->packet_index
,
1243 struct packet_index
, 1);
1246 g_array_index(pos
->packet_index
,
1247 struct packet_index
, 0) =
1248 g_array_index(pos
->packet_index
,
1249 struct packet_index
, 1);
1250 prev_index
= &g_array_index(pos
->packet_index
,
1251 struct packet_index
, 0);
1252 cur_index
= &g_array_index(pos
->packet_index
,
1253 struct packet_index
, 1);
1260 if (viewer_stream
->data_pending
) {
1261 lttng_index_to_packet_index(&viewer_stream
->current_index
, cur_index
);
1263 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1264 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
, &stream_id
);
1267 if (!lttng_live_should_quit()) {
1268 fprintf(stderr
, "[error] get_next_index failed\n");
1270 ret
= -BT_PACKET_SEEK_ERROR
;
1273 printf_verbose("Index received : packet_size : %" PRIu64
1274 ", offset %" PRIu64
", content_size %" PRIu64
1275 ", timestamp_end : %" PRIu64
"\n",
1276 cur_index
->packet_size
, cur_index
->offset
,
1277 cur_index
->content_size
,
1278 cur_index
->ts_cycles
.timestamp_end
);
1279 if (cur_index
->offset
== EOF
) {
1281 ret
= -BT_PACKET_SEEK_ERROR
;
1287 * On the first time we receive an index, the stream_id needs to
1288 * be set for the stream in order to use it, we don't want any
1289 * data at this stage.
1291 if (file_stream
->parent
.stream_id
== -1ULL) {
1293 * Warning: with lttng-tools < 2.4.2, the beacon does not
1294 * contain the real stream ID, it is memset to 0, so this
1295 * might create a problem when a session has multiple
1296 * channels. We can't detect it at this stage, lttng-tools
1297 * has to be upgraded to fix this problem.
1299 printf_verbose("Assigning stream_id %" PRIu64
"\n",
1301 file_stream
->parent
.stream_id
= stream_id
;
1302 viewer_stream
->ctf_stream_id
= stream_id
;
1308 pos
->packet_size
= cur_index
->packet_size
;
1309 pos
->content_size
= cur_index
->content_size
;
1310 pos
->mmap_base_offset
= 0;
1311 if (cur_index
->offset
== EOF
) {
1317 if (cur_index
->content_size
== 0) {
1318 /* Beacon packet index */
1319 if (file_stream
->parent
.stream_class
) {
1320 file_stream
->parent
.cycles_timestamp
=
1321 cur_index
->ts_cycles
.timestamp_end
;
1322 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1323 &file_stream
->parent
,
1324 cur_index
->ts_cycles
.timestamp_end
);
1327 * Duplicate the data from the previous index, because
1328 * the one we just received is only a beacon with no
1329 * relevant information except the timestamp_end. We
1330 * don't need to keep this timestamp_end because we already
1331 * updated the file_stream timestamps, so we only need
1332 * to keep the last real index data as prev_index. That
1333 * way, we keep the original prev timestamps and
1334 * discarded events counter. This is the same behaviour
1335 * as if we were reading a local trace, we would not
1336 * have fake indexes between real indexes.
1338 memcpy(cur_index
, prev_index
, sizeof(struct packet_index
));
1341 /* Real packet index */
1342 if (file_stream
->parent
.stream_class
) {
1343 /* Convert the timestamps and append to the real_index. */
1344 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1345 &file_stream
->parent
,
1346 cur_index
->ts_cycles
.timestamp_begin
);
1347 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1348 &file_stream
->parent
,
1349 cur_index
->ts_cycles
.timestamp_end
);
1352 ctf_update_current_packet_index(&file_stream
->parent
,
1353 prev_index
, cur_index
);
1356 * We need to check if we are in trace read or called
1357 * from packet indexing. In this last case, the
1358 * collection is not there, so we cannot print the
1361 if ((&file_stream
->parent
)->stream_class
->trace
->parent
.collection
) {
1362 ctf_print_discarded_lost(stderr
, &file_stream
->parent
);
1365 file_stream
->parent
.cycles_timestamp
=
1366 cur_index
->ts_cycles
.timestamp_begin
;
1367 file_stream
->parent
.real_timestamp
=
1368 cur_index
->ts_real
.timestamp_begin
;
1372 * Flush the output between attempts to grab a packet, thus
1373 * ensuring we flush at least at the periodical timer period.
1374 * This ensures the output remains reactive for interactive users and
1375 * that the output is flushed when redirected to a file by the shell.
1377 if (fflush(LTTNG_LIVE_OUTPUT_FP
) < 0) {
1382 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1386 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1388 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1390 cur_index
->packet_size
/ CHAR_BIT
);
1393 } else if (ret
< 0) {
1395 if (!lttng_live_should_quit()) {
1396 fprintf(stderr
, "[error] get_data_packet failed\n");
1397 ret
= -BT_PACKET_SEEK_ERROR
;
1403 viewer_stream
->data_pending
= 0;
1405 read_packet_header(pos
, file_stream
);
1408 bt_packet_seek_set_error(ret
);
1411 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1413 struct lttng_viewer_cmd cmd
;
1414 struct lttng_viewer_create_session_response resp
;
1418 if (lttng_live_should_quit()) {
1423 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1424 cmd
.data_size
= htobe64((uint64_t) 0);
1425 cmd
.cmd_version
= htobe32(0);
1427 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1429 perror("[error] Error sending cmd");
1432 assert(ret_len
== sizeof(cmd
));
1434 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1436 fprintf(stderr
, "[error] Remote side has closed connection\n");
1440 perror("[error] Error receiving create session reply");
1443 assert(ret_len
== sizeof(resp
));
1445 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1446 fprintf(stderr
, "[error] Error creating viewer session\n");
1458 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1460 struct bt_context
*bt_ctx
= user_data
;
1461 struct lttng_live_ctf_trace
*trace
= value
;
1463 struct lttng_live_viewer_stream
*lvstream
, *tmp
;
1466 * We don't have ownership of the live viewer stream, just
1467 * remove them from our list.
1469 bt_list_for_each_entry_safe(lvstream
, tmp
, &trace
->stream_list
,
1470 trace_stream_node
) {
1471 lvstream
->in_trace
= 0;
1472 bt_list_del(&lvstream
->trace_stream_node
);
1474 if (trace
->in_use
&& trace
->trace_id
>= 0) {
1475 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1477 fprintf(stderr
, "[error] removing trace from context\n");
1480 /* remove the key/value pair from the HT. */
1485 int add_one_trace(struct lttng_live_ctx
*ctx
,
1486 struct lttng_live_ctf_trace
*trace
)
1489 struct bt_context
*bt_ctx
= ctx
->bt_ctx
;
1490 struct lttng_live_viewer_stream
*stream
;
1491 struct bt_mmap_stream
*new_mmap_stream
;
1492 struct bt_mmap_stream_list mmap_list
;
1493 struct bt_trace_descriptor
*td
;
1494 struct bt_trace_handle
*handle
;
1496 printf_verbose("Add one trace ctf_trace_id: %" PRIu64
1497 " (metadata_stream: %p)\n",
1498 trace
->ctf_trace_id
, trace
->metadata_stream
);
1500 * We don't know how many streams we will receive for a trace, so
1501 * once we are done receiving the traces, we add all the traces
1502 * received to the bt_context.
1503 * We can receive streams during the attach command or the
1504 * get_new_streams, so we have to make sure not to add multiple
1505 * times the same traces.
1506 * If a trace is already in the context, we just skip this function.
1508 if (trace
->in_use
) {
1509 printf_verbose("Trace already in use\n");
1514 * add_one_trace can be called recursively if during the
1515 * bt_context_add_trace call we need to fetch new streams, so we need to
1516 * prevent a recursive call to process our current trace.
1520 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1522 bt_list_for_each_entry(stream
, &trace
->stream_list
, trace_stream_node
) {
1523 if (!stream
->metadata_flag
) {
1524 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1525 new_mmap_stream
->priv
= (void *) stream
;
1526 new_mmap_stream
->fd
= -1;
1527 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1529 char *metadata_buf
= NULL
;
1531 /* Get all possible metadata before starting */
1532 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1537 if (!stream
->metadata_len
) {
1538 fprintf(stderr
, "[error] empty metadata\n");
1544 printf_verbose("Metadata stream found\n");
1545 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1546 stream
->metadata_len
, "rb");
1547 if (!trace
->metadata_fp
) {
1548 perror("Metadata fmemopen");
1556 if (!trace
->metadata_fp
) {
1557 fprintf(stderr
, "[error] No metadata stream opened\n");
1562 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1563 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1565 fprintf(stderr
, "[error] Error adding trace\n");
1569 trace
->metadata_stream
->metadata_len
= 0;
1571 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1572 bt_ctx
->trace_handles
,
1573 (gpointer
) (unsigned long) ret
);
1575 trace
->handle
= handle
;
1576 if (bt_ctx
->current_iterator
) {
1577 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1580 trace
->trace_id
= ret
;
1581 printf_verbose("Trace now in use, id = %d\n", trace
->trace_id
);
1586 bt_context_put(bt_ctx
);
1592 * Make sure all the traces we know have a metadata stream or loop on
1593 * ask_new_streams until it is done. This must be called before we call
1596 * Return 0 when all known traces have a metadata stream, a negative value
1600 int check_traces_metadata(struct lttng_live_ctx
*ctx
)
1603 struct lttng_live_ctf_trace
*trace
;
1609 g_hash_table_iter_init(&it
, ctx
->session
->ctf_traces
);
1610 while (g_hash_table_iter_next(&it
, &key
, &value
)) {
1611 trace
= (struct lttng_live_ctf_trace
*) value
;
1612 printf_verbose("Check trace %" PRIu64
" metadata\n", trace
->ctf_trace_id
);
1613 while (!trace
->metadata_stream
) {
1614 printf_verbose("Waiting for metadata stream\n");
1615 if (lttng_live_should_quit()) {
1619 ret
= ask_new_streams(ctx
);
1622 } else if (ret
== 0) {
1623 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1626 * If ask_new_stream got streams from a trace we did not know
1627 * about until now, we have to reinitialize the iterator.
1637 printf_verbose("End check traces metadata\n");
1642 int add_traces(struct lttng_live_ctx
*ctx
)
1645 struct lttng_live_ctf_trace
*trace
;
1649 unsigned int nr_traces
;
1651 printf_verbose("Begin add traces\n");
1654 nr_traces
= g_hash_table_size(ctx
->session
->ctf_traces
);
1656 ret
= check_traces_metadata(ctx
);
1661 g_hash_table_iter_init(&it
, ctx
->session
->ctf_traces
);
1662 while (g_hash_table_iter_next(&it
, &key
, &value
)) {
1663 trace
= (struct lttng_live_ctf_trace
*) value
;
1664 ret
= add_one_trace(ctx
, trace
);
1669 * If a new trace got added while we were adding the trace, the
1670 * iterator is invalid and we have to restart.
1672 if (g_hash_table_size(ctx
->session
->ctf_traces
) != nr_traces
) {
1673 printf_verbose("New trace(s) added during add_one_trace()\n");
1681 printf_verbose("End add traces\n");
1686 * Request new streams for a session.
1687 * Returns the number of streams received or a negative value on error.
1689 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1691 struct lttng_viewer_cmd cmd
;
1692 struct lttng_viewer_new_streams_request rq
;
1693 struct lttng_viewer_new_streams_response rp
;
1694 struct lttng_viewer_stream stream
;
1695 int ret
, i
, nb_streams
= 0;
1697 uint32_t stream_count
;
1698 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
1699 char cmd_buf
[cmd_buf_len
];
1701 if (lttng_live_should_quit()) {
1706 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1707 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
1708 cmd
.cmd_version
= htobe32(0);
1710 memset(&rq
, 0, sizeof(rq
));
1711 rq
.session_id
= htobe64(id
);
1714 * Merge the cmd and connection request to prevent a write-write
1715 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1716 * second write to be performed quickly in presence of Nagle's algorithm.
1718 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1719 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1721 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
1723 perror("[error] Error sending get_new_streams cmd and request");
1726 assert(ret_len
== cmd_buf_len
);
1728 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1730 fprintf(stderr
, "[error] Remote side has closed connection\n");
1734 perror("[error] Error receiving get_new_streams response");
1737 assert(ret_len
== sizeof(rp
));
1739 switch(be32toh(rp
.status
)) {
1740 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1742 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1745 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1746 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1748 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1749 fprintf(stderr
, "[error] get_new_streams error\n");
1752 fprintf(stderr
, "[error] Unknown return code %u\n",
1753 be32toh(rp
.status
));
1757 stream_count
= be32toh(rp
.streams_count
);
1758 ctx
->session
->stream_count
+= stream_count
;
1760 * When the session is created but not started, we do an active wait
1761 * until it starts. It allows the viewer to start processing the trace
1762 * as soon as the session starts.
1764 if (ctx
->session
->stream_count
== 0) {
1768 printf_verbose("Waiting for %d streams:\n", stream_count
);
1770 for (i
= 0; i
< stream_count
; i
++) {
1771 struct lttng_live_viewer_stream
*lvstream
;
1773 lvstream
= g_new0(struct lttng_live_viewer_stream
, 1);
1774 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
,
1777 fprintf(stderr
, "[error] Remote side has closed connection\n");
1782 perror("[error] Error receiving stream");
1786 assert(ret_len
== sizeof(stream
));
1787 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1788 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1790 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1791 be64toh(stream
.id
), stream
.path_name
,
1792 stream
.channel_name
);
1793 lvstream
->id
= be64toh(stream
.id
);
1794 lvstream
->session
= ctx
->session
;
1796 lvstream
->mmap_size
= 0;
1797 lvstream
->ctf_stream_id
= -1ULL;
1799 if (be32toh(stream
.metadata_flag
)) {
1800 lvstream
->metadata_flag
= 1;
1802 ret
= lttng_live_ctf_trace_assign(lvstream
,
1803 be64toh(stream
.ctf_trace_id
));
1809 bt_list_add(&lvstream
->session_stream_node
,
1810 &ctx
->session
->stream_list
);
1820 int lttng_live_read(struct lttng_live_ctx
*ctx
)
1824 struct bt_ctf_iter
*iter
;
1825 const struct bt_ctf_event
*event
;
1826 struct bt_iter_pos begin_pos
;
1827 struct bt_trace_descriptor
*td_write
;
1828 struct bt_format
*fmt_write
;
1829 struct ctf_text_stream_pos
*sout
;
1832 ctx
->bt_ctx
= bt_context_create();
1834 fprintf(stderr
, "[error] bt_context_create allocation\n");
1838 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1840 fprintf(stderr
, "[error] ctf-text error\n");
1844 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1846 fprintf(stderr
, "[error] Error opening output trace\n");
1850 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1852 if (!sout
->parent
.event_cb
) {
1856 ret
= lttng_live_create_viewer_session(ctx
);
1861 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1862 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1863 printf_verbose("Attaching to session %" PRIu64
"\n", id
);
1864 ret
= lttng_live_attach_session(ctx
, id
);
1865 printf_verbose("Attaching session returns %d\n", ret
);
1867 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1868 fprintf(stderr
, "[error] Unknown session ID\n");
1875 * As long as the session is active, we try to get new streams.
1880 if (lttng_live_should_quit()) {
1885 while (!ctx
->session
->stream_count
) {
1886 if (lttng_live_should_quit()
1887 || ctx
->session_ids
->len
== 0) {
1891 ret
= ask_new_streams(ctx
);
1896 if (!ctx
->session
->stream_count
) {
1897 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1901 ret
= add_traces(ctx
);
1906 begin_pos
.type
= BT_SEEK_BEGIN
;
1907 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1909 if (lttng_live_should_quit()) {
1913 fprintf(stderr
, "[error] Iterator creation error\n");
1917 if (lttng_live_should_quit()) {
1921 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1922 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1927 ret
= sout
->parent
.event_cb(&sout
->parent
,
1928 event
->parent
->stream
);
1930 fprintf(stderr
, "[error] Writing "
1935 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1940 bt_ctf_iter_destroy(iter
);
1941 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1942 del_traces
, ctx
->bt_ctx
);
1943 ctx
->session
->stream_count
= 0;
1947 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1948 del_traces
, ctx
->bt_ctx
);
1949 bt_context_put(ctx
->bt_ctx
);
1951 if (lttng_live_should_quit()) {