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 BT_INIT_LIST_HEAD(&trace
->stream_list
);
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 assert(!stream
->in_trace
);
402 stream
->in_trace
= 1;
403 stream
->ctf_trace
= trace
;
404 bt_list_add(&stream
->trace_stream_node
, &trace
->stream_list
);
410 int open_metadata_fp_write(struct lttng_live_viewer_stream
*stream
,
411 char **metadata_buf
, size_t *size
)
415 stream
->metadata_fp_write
=
416 babeltrace_open_memstream(metadata_buf
, size
);
417 if (!stream
->metadata_fp_write
) {
418 perror("Metadata open_memstream");
425 int lttng_live_attach_session(struct lttng_live_ctx
*ctx
, uint64_t id
)
427 struct lttng_viewer_cmd cmd
;
428 struct lttng_viewer_attach_session_request rq
;
429 struct lttng_viewer_attach_session_response rp
;
430 struct lttng_viewer_stream stream
;
431 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
432 char cmd_buf
[cmd_buf_len
];
436 if (lttng_live_should_quit()) {
441 cmd
.cmd
= htobe32(LTTNG_VIEWER_ATTACH_SESSION
);
442 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
443 cmd
.cmd_version
= htobe32(0);
445 memset(&rq
, 0, sizeof(rq
));
446 rq
.session_id
= htobe64(id
);
447 // TODO: add cmd line parameter to select seek beginning
448 // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
449 rq
.seek
= htobe32(LTTNG_VIEWER_SEEK_LAST
);
452 * Merge the cmd and connection request to prevent a write-write
453 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
454 * second write to be performed quickly in presence of Nagle's algorithm.
456 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
457 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
459 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
461 perror("[error] Error sending attach command and request");
464 assert(ret_len
== cmd_buf_len
);
466 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
468 fprintf(stderr
, "[error] Remote side has closed connection\n");
472 perror("[error] Error receiving attach response");
475 assert(ret_len
== sizeof(rp
));
477 switch(be32toh(rp
.status
)) {
478 case LTTNG_VIEWER_ATTACH_OK
:
480 case LTTNG_VIEWER_ATTACH_UNK
:
481 ret
= -LTTNG_VIEWER_ATTACH_UNK
;
483 case LTTNG_VIEWER_ATTACH_ALREADY
:
484 fprintf(stderr
, "[error] There is already a viewer attached to this session\n");
486 case LTTNG_VIEWER_ATTACH_NOT_LIVE
:
487 fprintf(stderr
, "[error] Not a live session\n");
489 case LTTNG_VIEWER_ATTACH_SEEK_ERR
:
490 fprintf(stderr
, "[error] Wrong seek parameter\n");
493 fprintf(stderr
, "[error] Unknown attach return code %u\n",
497 if (be32toh(rp
.status
) != LTTNG_VIEWER_ATTACH_OK
) {
501 ctx
->session
->stream_count
+= be32toh(rp
.streams_count
);
503 * When the session is created but not started, we do an active wait
504 * until it starts. It allows the viewer to start processing the trace
505 * as soon as the session starts.
507 if (ctx
->session
->stream_count
== 0) {
511 printf_verbose("Waiting for %d streams:\n",
512 be32toh(rp
.streams_count
));
513 for (i
= 0; i
< be32toh(rp
.streams_count
); i
++) {
514 struct lttng_live_viewer_stream
*lvstream
;
516 lvstream
= g_new0(struct lttng_live_viewer_stream
, 1);
517 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
,
520 fprintf(stderr
, "[error] Remote side has closed connection\n");
525 perror("[error] Error receiving stream");
529 assert(ret_len
== sizeof(stream
));
530 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
531 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
533 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
534 be64toh(stream
.id
), stream
.path_name
,
535 stream
.channel_name
);
536 lvstream
->id
= be64toh(stream
.id
);
537 lvstream
->session
= ctx
->session
;
539 lvstream
->mmap_size
= 0;
540 lvstream
->ctf_stream_id
= -1ULL;
542 if (be32toh(stream
.metadata_flag
)) {
543 lvstream
->metadata_flag
= 1;
545 ret
= lttng_live_ctf_trace_assign(lvstream
,
546 be64toh(stream
.ctf_trace_id
));
551 bt_list_add(&lvstream
->session_stream_node
,
552 &ctx
->session
->stream_list
);
563 * Ask the relay for new streams.
565 * Returns the number of new streams received or a negative value on error.
568 int ask_new_streams(struct lttng_live_ctx
*ctx
)
570 int i
, ret
= 0, nb_streams
= 0;
574 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
575 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
576 ret
= lttng_live_get_new_streams(ctx
, id
);
577 printf_verbose("Asking for new streams returns %d\n", ret
);
578 if (lttng_live_should_quit()) {
583 if (ret
== -LTTNG_VIEWER_NEW_STREAMS_HUP
) {
584 printf_verbose("Session %" PRIu64
" closed\n",
587 * The streams have already been closed during
588 * the reading, so we only need to get rid of
589 * the trace in our internal table of sessions.
591 g_array_remove_index(ctx
->session_ids
, i
);
593 * We can't continue iterating on the g_array
594 * after a remove, we have to start again.
605 if (ctx
->session_ids
->len
== 0) {
606 /* All sessions are closed. */
617 int append_metadata(struct lttng_live_ctx
*ctx
,
618 struct lttng_live_viewer_stream
*viewer_stream
)
621 struct lttng_live_viewer_stream
*metadata
;
622 char *metadata_buf
= NULL
;
624 if (!viewer_stream
->ctf_trace
->handle
) {
625 printf_verbose("append_metadata: trace handle not ready yet.\n");
629 printf_verbose("get_next_index: new metadata needed\n");
630 ret
= get_new_metadata(ctx
, viewer_stream
, &metadata_buf
);
636 metadata
= viewer_stream
->ctf_trace
->metadata_stream
;
637 metadata
->ctf_trace
->metadata_fp
=
638 babeltrace_fmemopen(metadata_buf
,
639 metadata
->metadata_len
, "rb");
640 if (!metadata
->ctf_trace
->metadata_fp
) {
641 perror("Metadata fmemopen");
646 ret
= ctf_append_trace_metadata(
647 viewer_stream
->ctf_trace
->handle
->td
,
648 metadata
->ctf_trace
->metadata_fp
);
649 /* We accept empty metadata packets */
650 if (ret
!= 0 && ret
!= -ENOENT
) {
651 fprintf(stderr
, "[error] Appending metadata\n");
661 int get_data_packet(struct lttng_live_ctx
*ctx
,
662 struct ctf_stream_pos
*pos
,
663 struct lttng_live_viewer_stream
*stream
, uint64_t offset
,
666 struct lttng_viewer_cmd cmd
;
667 struct lttng_viewer_get_packet rq
;
668 struct lttng_viewer_trace_packet rp
;
669 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
670 char cmd_buf
[cmd_buf_len
];
675 if (lttng_live_should_quit()) {
680 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_PACKET
);
681 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
682 cmd
.cmd_version
= htobe32(0);
684 memset(&rq
, 0, sizeof(rq
));
685 rq
.stream_id
= htobe64(stream
->id
);
686 rq
.offset
= htobe64(offset
);
687 rq
.len
= htobe32(len
);
690 * Merge the cmd and connection request to prevent a write-write
691 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
692 * second write to be performed quickly in presence of Nagle's algorithm.
694 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
695 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
697 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
699 perror("[error] Error sending get_data_packet cmd and request");
702 assert(ret_len
== cmd_buf_len
);
704 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
706 fprintf(stderr
, "[error] Remote side has closed connection\n");
710 perror("[error] Error receiving data response");
713 if (ret_len
!= sizeof(rp
)) {
714 fprintf(stderr
, "[error] get_data_packet: expected %zu"
715 ", received %zd\n", sizeof(rp
),
720 rp
.flags
= be32toh(rp
.flags
);
722 switch (be32toh(rp
.status
)) {
723 case LTTNG_VIEWER_GET_PACKET_OK
:
724 len
= be32toh(rp
.len
);
725 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
728 case LTTNG_VIEWER_GET_PACKET_RETRY
:
729 /* Unimplemented by relay daemon */
730 printf_verbose("get_data_packet: retry\n");
732 case LTTNG_VIEWER_GET_PACKET_ERR
:
733 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
734 printf_verbose("get_data_packet: new metadata needed\n");
735 ret
= append_metadata(ctx
, stream
);
739 if (rp
.flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
740 printf_verbose("get_data_packet: new streams needed\n");
741 ret
= ask_new_streams(ctx
);
744 } else if (ret
> 0) {
745 ret
= add_traces(ctx
);
751 if (rp
.flags
& (LTTNG_VIEWER_FLAG_NEW_METADATA
752 | LTTNG_VIEWER_FLAG_NEW_STREAM
)) {
755 fprintf(stderr
, "[error] get_data_packet: error\n");
757 case LTTNG_VIEWER_GET_PACKET_EOF
:
761 printf_verbose("get_data_packet: unknown\n");
769 if (len
> stream
->mmap_size
) {
772 new_size
= max_t(uint64_t, len
, stream
->mmap_size
<< 1);
775 ret
= munmap_align(pos
->base_mma
);
777 perror("[error] Unable to unmap old base");
780 pos
->base_mma
= NULL
;
782 pos
->base_mma
= mmap_align(new_size
,
783 PROT_READ
| PROT_WRITE
,
784 MAP_PRIVATE
| MAP_ANONYMOUS
, -1, 0);
785 if (pos
->base_mma
== MAP_FAILED
) {
786 perror("[error] mmap error");
787 pos
->base_mma
= NULL
;
791 stream
->mmap_size
= new_size
;
792 printf_verbose("Expanding stream mmap size to %" PRIu64
" bytes\n",
796 ret_len
= lttng_live_recv(ctx
->control_sock
,
797 mmap_align_addr(pos
->base_mma
), len
);
799 fprintf(stderr
, "[error] Remote side has closed connection\n");
803 perror("[error] Error receiving trace packet");
806 assert(ret_len
== len
);
816 int get_one_metadata_packet(struct lttng_live_ctx
*ctx
,
817 struct lttng_live_viewer_stream
*metadata_stream
)
821 struct lttng_viewer_cmd cmd
;
822 struct lttng_viewer_get_metadata rq
;
823 struct lttng_viewer_metadata_packet rp
;
826 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
827 char cmd_buf
[cmd_buf_len
];
829 if (lttng_live_should_quit()) {
834 rq
.stream_id
= htobe64(metadata_stream
->id
);
835 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_METADATA
);
836 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
837 cmd
.cmd_version
= htobe32(0);
840 * Merge the cmd and connection request to prevent a write-write
841 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
842 * second write to be performed quickly in presence of Nagle's algorithm.
844 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
845 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
847 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
849 perror("[error] Error sending get_metadata cmd and request");
852 assert(ret_len
== cmd_buf_len
);
854 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
856 fprintf(stderr
, "[error] Remote side has closed connection\n");
860 perror("[error] Error receiving metadata response");
863 assert(ret_len
== sizeof(rp
));
865 switch (be32toh(rp
.status
)) {
866 case LTTNG_VIEWER_METADATA_OK
:
867 printf_verbose("get_metadata : OK\n");
869 case LTTNG_VIEWER_NO_NEW_METADATA
:
870 printf_verbose("get_metadata : NO NEW\n");
873 case LTTNG_VIEWER_METADATA_ERR
:
874 printf_verbose("get_metadata : ERR\n");
877 printf_verbose("get_metadata : UNKNOWN\n");
881 len
= be64toh(rp
.len
);
882 printf_verbose("Writing %" PRIu64
" bytes to metadata\n", len
);
889 perror("relay data zmalloc");
892 ret_len
= lttng_live_recv(ctx
->control_sock
, data
, len
);
894 fprintf(stderr
, "[error] Remote side has closed connection\n");
895 goto error_free_data
;
898 perror("[error] Error receiving trace packet");
899 goto error_free_data
;
901 assert(ret_len
== len
);
904 ret_len
= fwrite(data
, 1, len
,
905 metadata_stream
->metadata_fp_write
);
906 } while (ret_len
< 0 && errno
== EINTR
);
908 fprintf(stderr
, "[error] Writing in the metadata fp\n");
909 goto error_free_data
;
911 assert(ret_len
== len
);
912 metadata_stream
->metadata_len
+= len
;
925 * Return 0 on success, a negative value on error.
928 int get_new_metadata(struct lttng_live_ctx
*ctx
,
929 struct lttng_live_viewer_stream
*viewer_stream
,
933 struct lttng_live_viewer_stream
*metadata_stream
;
934 size_t size
, len_read
= 0;
936 metadata_stream
= viewer_stream
->ctf_trace
->metadata_stream
;
937 if (!metadata_stream
) {
938 fprintf(stderr
, "[error] No metadata stream\n");
942 metadata_stream
->metadata_len
= 0;
943 ret
= open_metadata_fp_write(metadata_stream
, metadata_buf
, &size
);
949 if (lttng_live_should_quit()) {
954 * get_one_metadata_packet returns the number of bytes
955 * received, 0 when we have received everything, a
956 * negative value on error.
958 ret
= get_one_metadata_packet(ctx
, metadata_stream
);
963 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
966 break; /* Stop on error. */
968 } while (ret
> 0 || !len_read
);
970 if (babeltrace_close_memstream(metadata_buf
, &size
,
971 metadata_stream
->metadata_fp_write
)) {
972 perror("babeltrace_close_memstream");
974 metadata_stream
->metadata_fp_write
= NULL
;
981 * Assign the fields from a lttng_viewer_index to a packet_index.
984 void lttng_index_to_packet_index(struct lttng_viewer_index
*lindex
,
985 struct packet_index
*pindex
)
990 pindex
->offset
= be64toh(lindex
->offset
);
991 pindex
->packet_size
= be64toh(lindex
->packet_size
);
992 pindex
->content_size
= be64toh(lindex
->content_size
);
993 pindex
->ts_cycles
.timestamp_begin
= be64toh(lindex
->timestamp_begin
);
994 pindex
->ts_cycles
.timestamp_end
= be64toh(lindex
->timestamp_end
);
995 pindex
->events_discarded
= be64toh(lindex
->events_discarded
);
999 * Get one index for a stream.
1001 * Returns 0 on success or a negative value on error.
1004 int get_next_index(struct lttng_live_ctx
*ctx
,
1005 struct lttng_live_viewer_stream
*viewer_stream
,
1006 struct packet_index
*index
, uint64_t *stream_id
)
1008 struct lttng_viewer_cmd cmd
;
1009 struct lttng_viewer_get_next_index rq
;
1012 struct lttng_viewer_index
*rp
= &viewer_stream
->current_index
;
1013 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
1014 char cmd_buf
[cmd_buf_len
];
1016 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEXT_INDEX
);
1017 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
1018 cmd
.cmd_version
= htobe32(0);
1020 memset(&rq
, 0, sizeof(rq
));
1021 rq
.stream_id
= htobe64(viewer_stream
->id
);
1024 * Merge the cmd and connection request to prevent a write-write
1025 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1026 * second write to be performed quickly in presence of Nagle's algorithm.
1028 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1029 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1031 if (lttng_live_should_quit()) {
1035 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd_buf
, cmd_buf_len
);
1037 perror("[error] Error sending get_next_index cmd and request");
1040 assert(ret_len
== cmd_buf_len
);
1042 ret_len
= lttng_live_recv(ctx
->control_sock
, rp
, sizeof(*rp
));
1044 fprintf(stderr
, "[error] Remote side has closed connection\n");
1048 perror("[error] Error receiving index response");
1051 assert(ret_len
== sizeof(*rp
));
1053 rp
->flags
= be32toh(rp
->flags
);
1055 switch (be32toh(rp
->status
)) {
1056 case LTTNG_VIEWER_INDEX_INACTIVE
:
1057 printf_verbose("get_next_index: inactive\n");
1059 if (index
->ts_cycles
.timestamp_end
==
1060 be64toh(rp
->timestamp_end
)) {
1061 /* Already seen this timestamp. */
1062 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1065 memset(index
, 0, sizeof(struct packet_index
));
1066 index
->ts_cycles
.timestamp_end
= be64toh(rp
->timestamp_end
);
1067 *stream_id
= be64toh(rp
->stream_id
);
1069 case LTTNG_VIEWER_INDEX_OK
:
1070 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
1071 rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
);
1072 lttng_index_to_packet_index(rp
, index
);
1073 *stream_id
= be64toh(rp
->stream_id
);
1074 viewer_stream
->data_pending
= 1;
1076 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_METADATA
) {
1077 ret
= append_metadata(ctx
, viewer_stream
);
1081 if (rp
->flags
& LTTNG_VIEWER_FLAG_NEW_STREAM
) {
1082 printf_verbose("get_next_index: need new streams\n");
1083 ret
= ask_new_streams(ctx
);
1086 } else if (ret
> 0) {
1087 ret
= add_traces(ctx
);
1094 case LTTNG_VIEWER_INDEX_RETRY
:
1095 printf_verbose("get_next_index: retry\n");
1096 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1098 case LTTNG_VIEWER_INDEX_HUP
:
1099 printf_verbose("get_next_index: stream hung up\n");
1100 viewer_stream
->id
= -1ULL;
1101 index
->offset
= EOF
;
1102 ctx
->session
->stream_count
--;
1103 viewer_stream
->in_trace
= 0;
1104 bt_list_del(&viewer_stream
->trace_stream_node
);
1105 bt_list_del(&viewer_stream
->session_stream_node
);
1106 g_free(viewer_stream
);
1108 case LTTNG_VIEWER_INDEX_ERR
:
1109 fprintf(stderr
, "[error] get_next_index: error\n");
1112 fprintf(stderr
, "[error] get_next_index: unkwown value\n");
1124 void read_packet_header(struct ctf_stream_pos
*pos
,
1125 struct ctf_file_stream
*file_stream
)
1129 /* update trace_packet_header and stream_packet_context */
1130 if (!(pos
->prot
& PROT_WRITE
) &&
1131 file_stream
->parent
.trace_packet_header
) {
1132 /* Read packet header */
1133 ret
= generic_rw(&pos
->parent
,
1134 &file_stream
->parent
.trace_packet_header
->p
);
1137 fprintf(stderr
, "[error] trace packet "
1138 "header read failed\n");
1142 if (!(pos
->prot
& PROT_WRITE
) &&
1143 file_stream
->parent
.stream_packet_context
) {
1144 /* Read packet context */
1145 ret
= generic_rw(&pos
->parent
,
1146 &file_stream
->parent
.stream_packet_context
->p
);
1149 fprintf(stderr
, "[error] stream packet "
1150 "context read failed\n");
1154 pos
->data_offset
= pos
->offset
;
1161 * Handle the seek parameters.
1162 * Returns 0 if the packet_seek can continue, a positive value to
1163 * cleanly exit the packet_seek, a negative value on error.
1166 int handle_seek_position(size_t index
, int whence
,
1167 struct lttng_live_viewer_stream
*viewer_stream
,
1168 struct ctf_stream_pos
*pos
,
1169 struct ctf_file_stream
*file_stream
)
1179 * We only allow to seek to 0.
1182 fprintf(stderr
, "[error] Arbitrary seek in lttng-live "
1183 "trace not supported\n");
1193 fprintf(stderr
, "[error] Invalid seek parameter\n");
1202 void ctf_live_packet_seek(struct bt_stream_pos
*stream_pos
, size_t index
,
1205 struct ctf_stream_pos
*pos
;
1206 struct ctf_file_stream
*file_stream
;
1207 struct packet_index
*prev_index
= NULL
, *cur_index
;
1208 struct lttng_live_viewer_stream
*viewer_stream
;
1209 struct lttng_live_session
*session
;
1210 uint64_t stream_id
= -1ULL;
1213 pos
= ctf_pos(stream_pos
);
1214 file_stream
= container_of(pos
, struct ctf_file_stream
, pos
);
1215 viewer_stream
= (struct lttng_live_viewer_stream
*) pos
->priv
;
1216 session
= viewer_stream
->session
;
1218 ret
= handle_seek_position(index
, whence
, viewer_stream
, pos
,
1225 switch (pos
->packet_index
->len
) {
1227 g_array_set_size(pos
->packet_index
, 1);
1228 cur_index
= &g_array_index(pos
->packet_index
,
1229 struct packet_index
, 0);
1232 g_array_set_size(pos
->packet_index
, 2);
1233 prev_index
= &g_array_index(pos
->packet_index
,
1234 struct packet_index
, 0);
1235 cur_index
= &g_array_index(pos
->packet_index
,
1236 struct packet_index
, 1);
1239 g_array_index(pos
->packet_index
,
1240 struct packet_index
, 0) =
1241 g_array_index(pos
->packet_index
,
1242 struct packet_index
, 1);
1243 prev_index
= &g_array_index(pos
->packet_index
,
1244 struct packet_index
, 0);
1245 cur_index
= &g_array_index(pos
->packet_index
,
1246 struct packet_index
, 1);
1253 if (viewer_stream
->data_pending
) {
1254 lttng_index_to_packet_index(&viewer_stream
->current_index
, cur_index
);
1256 printf_verbose("get_next_index for stream %" PRIu64
"\n", viewer_stream
->id
);
1257 ret
= get_next_index(session
->ctx
, viewer_stream
, cur_index
, &stream_id
);
1260 if (!lttng_live_should_quit()) {
1261 fprintf(stderr
, "[error] get_next_index failed\n");
1265 printf_verbose("Index received : packet_size : %" PRIu64
1266 ", offset %" PRIu64
", content_size %" PRIu64
1267 ", timestamp_end : %" PRIu64
"\n",
1268 cur_index
->packet_size
, cur_index
->offset
,
1269 cur_index
->content_size
,
1270 cur_index
->ts_cycles
.timestamp_end
);
1275 * On the first time we receive an index, the stream_id needs to
1276 * be set for the stream in order to use it, we don't want any
1277 * data at this stage.
1279 if (file_stream
->parent
.stream_id
== -1ULL) {
1281 * Warning: with lttng-tools < 2.4.2, the beacon does not
1282 * contain the real stream ID, it is memset to 0, so this
1283 * might create a problem when a session has multiple
1284 * channels. We can't detect it at this stage, lttng-tools
1285 * has to be upgraded to fix this problem.
1287 printf_verbose("Assigning stream_id %" PRIu64
"\n",
1289 file_stream
->parent
.stream_id
= stream_id
;
1290 viewer_stream
->ctf_stream_id
= stream_id
;
1295 pos
->packet_size
= cur_index
->packet_size
;
1296 pos
->content_size
= cur_index
->content_size
;
1297 pos
->mmap_base_offset
= 0;
1298 if (cur_index
->offset
== EOF
) {
1304 if (cur_index
->content_size
== 0) {
1305 /* Beacon packet index */
1306 if (file_stream
->parent
.stream_class
) {
1307 file_stream
->parent
.cycles_timestamp
=
1308 cur_index
->ts_cycles
.timestamp_end
;
1309 file_stream
->parent
.real_timestamp
= ctf_get_real_timestamp(
1310 &file_stream
->parent
,
1311 cur_index
->ts_cycles
.timestamp_end
);
1314 * Duplicate the data from the previous index, because
1315 * the one we just received is only a beacon with no
1316 * relevant information except the timestamp_end. We
1317 * don't need to keep this timestamp_end because we already
1318 * updated the file_stream timestamps, so we only need
1319 * to keep the last real index data as prev_index. That
1320 * way, we keep the original prev timestamps and
1321 * discarded events counter. This is the same behaviour
1322 * as if we were reading a local trace, we would not
1323 * have fake indexes between real indexes.
1325 memcpy(cur_index
, prev_index
, sizeof(struct packet_index
));
1328 /* Real packet index */
1329 if (file_stream
->parent
.stream_class
) {
1330 /* Convert the timestamps and append to the real_index. */
1331 cur_index
->ts_real
.timestamp_begin
= ctf_get_real_timestamp(
1332 &file_stream
->parent
,
1333 cur_index
->ts_cycles
.timestamp_begin
);
1334 cur_index
->ts_real
.timestamp_end
= ctf_get_real_timestamp(
1335 &file_stream
->parent
,
1336 cur_index
->ts_cycles
.timestamp_end
);
1339 ctf_update_current_packet_index(&file_stream
->parent
,
1340 prev_index
, cur_index
);
1343 * We need to check if we are in trace read or called
1344 * from packet indexing. In this last case, the
1345 * collection is not there, so we cannot print the
1348 if ((&file_stream
->parent
)->stream_class
->trace
->parent
.collection
) {
1349 ctf_print_discarded_lost(stderr
, &file_stream
->parent
);
1352 file_stream
->parent
.cycles_timestamp
=
1353 cur_index
->ts_cycles
.timestamp_begin
;
1354 file_stream
->parent
.real_timestamp
=
1355 cur_index
->ts_real
.timestamp_begin
;
1359 * Flush the output between attempts to grab a packet, thus
1360 * ensuring we flush at least at the periodical timer period.
1361 * This ensures the output remains reactive for interactive users and
1362 * that the output is flushed when redirected to a file by the shell.
1364 if (fflush(LTTNG_LIVE_OUTPUT_FP
) < 0) {
1369 if (pos
->packet_size
== 0 || pos
->offset
== EOF
) {
1373 printf_verbose("get_data_packet for stream %" PRIu64
"\n",
1375 ret
= get_data_packet(session
->ctx
, pos
, viewer_stream
,
1377 cur_index
->packet_size
/ CHAR_BIT
);
1380 } else if (ret
< 0) {
1382 if (!lttng_live_should_quit()) {
1383 fprintf(stderr
, "[error] get_data_packet failed\n");
1387 viewer_stream
->data_pending
= 0;
1389 read_packet_header(pos
, file_stream
);
1395 int lttng_live_create_viewer_session(struct lttng_live_ctx
*ctx
)
1397 struct lttng_viewer_cmd cmd
;
1398 struct lttng_viewer_create_session_response resp
;
1402 if (lttng_live_should_quit()) {
1407 cmd
.cmd
= htobe32(LTTNG_VIEWER_CREATE_SESSION
);
1408 cmd
.data_size
= htobe64((uint64_t) 0);
1409 cmd
.cmd_version
= htobe32(0);
1411 ret_len
= lttng_live_send(ctx
->control_sock
, &cmd
, sizeof(cmd
));
1413 perror("[error] Error sending cmd");
1416 assert(ret_len
== sizeof(cmd
));
1418 ret_len
= lttng_live_recv(ctx
->control_sock
, &resp
, sizeof(resp
));
1420 fprintf(stderr
, "[error] Remote side has closed connection\n");
1424 perror("[error] Error receiving create session reply");
1427 assert(ret_len
== sizeof(resp
));
1429 if (be32toh(resp
.status
) != LTTNG_VIEWER_CREATE_SESSION_OK
) {
1430 fprintf(stderr
, "[error] Error creating viewer session\n");
1442 int del_traces(gpointer key
, gpointer value
, gpointer user_data
)
1444 struct bt_context
*bt_ctx
= user_data
;
1445 struct lttng_live_ctf_trace
*trace
= value
;
1447 struct lttng_live_viewer_stream
*lvstream
, *tmp
;
1450 * We don't have ownership of the live viewer stream, just
1451 * remove them from our list.
1453 bt_list_for_each_entry_safe(lvstream
, tmp
, &trace
->stream_list
,
1454 trace_stream_node
) {
1455 lvstream
->in_trace
= 0;
1456 bt_list_del(&lvstream
->trace_stream_node
);
1458 if (trace
->in_use
) {
1459 ret
= bt_context_remove_trace(bt_ctx
, trace
->trace_id
);
1461 fprintf(stderr
, "[error] removing trace from context\n");
1464 /* remove the key/value pair from the HT. */
1469 int add_one_trace(struct lttng_live_ctx
*ctx
,
1470 struct lttng_live_ctf_trace
*trace
)
1473 struct bt_context
*bt_ctx
= ctx
->bt_ctx
;
1474 struct lttng_live_viewer_stream
*stream
;
1475 struct bt_mmap_stream
*new_mmap_stream
;
1476 struct bt_mmap_stream_list mmap_list
;
1477 struct bt_trace_descriptor
*td
;
1478 struct bt_trace_handle
*handle
;
1481 * We don't know how many streams we will receive for a trace, so
1482 * once we are done receiving the traces, we add all the traces
1483 * received to the bt_context.
1484 * We can receive streams during the attach command or the
1485 * get_new_streams, so we have to make sure not to add multiple
1486 * times the same traces.
1487 * If a trace is already in the context, we just skip this function.
1489 if (trace
->in_use
) {
1494 BT_INIT_LIST_HEAD(&mmap_list
.head
);
1496 bt_list_for_each_entry(stream
, &trace
->stream_list
, trace_stream_node
) {
1497 if (!stream
->metadata_flag
) {
1498 new_mmap_stream
= zmalloc(sizeof(struct bt_mmap_stream
));
1499 new_mmap_stream
->priv
= (void *) stream
;
1500 new_mmap_stream
->fd
= -1;
1501 bt_list_add(&new_mmap_stream
->list
, &mmap_list
.head
);
1503 char *metadata_buf
= NULL
;
1505 /* Get all possible metadata before starting */
1506 ret
= get_new_metadata(ctx
, stream
, &metadata_buf
);
1511 if (!stream
->metadata_len
) {
1512 fprintf(stderr
, "[error] empty metadata\n");
1518 trace
->metadata_fp
= babeltrace_fmemopen(metadata_buf
,
1519 stream
->metadata_len
, "rb");
1520 if (!trace
->metadata_fp
) {
1521 perror("Metadata fmemopen");
1529 if (!trace
->metadata_fp
) {
1530 fprintf(stderr
, "[error] No metadata stream opened\n");
1535 ret
= bt_context_add_trace(bt_ctx
, NULL
, "ctf",
1536 ctf_live_packet_seek
, &mmap_list
, trace
->metadata_fp
);
1538 fprintf(stderr
, "[error] Error adding trace\n");
1542 trace
->metadata_stream
->metadata_len
= 0;
1544 handle
= (struct bt_trace_handle
*) g_hash_table_lookup(
1545 bt_ctx
->trace_handles
,
1546 (gpointer
) (unsigned long) ret
);
1548 trace
->handle
= handle
;
1549 if (bt_ctx
->current_iterator
) {
1550 bt_iter_add_trace(bt_ctx
->current_iterator
, td
);
1553 trace
->trace_id
= ret
;
1559 bt_context_put(bt_ctx
);
1565 int add_traces(struct lttng_live_ctx
*ctx
)
1568 struct lttng_live_ctf_trace
*trace
;
1573 g_hash_table_iter_init(&it
, ctx
->session
->ctf_traces
);
1574 while (g_hash_table_iter_next(&it
, &key
, &value
)) {
1575 trace
= (struct lttng_live_ctf_trace
*) value
;
1576 ret
= add_one_trace(ctx
, trace
);
1589 * Request new streams for a session.
1590 * Returns the number of streams received or a negative value on error.
1592 int lttng_live_get_new_streams(struct lttng_live_ctx
*ctx
, uint64_t id
)
1594 struct lttng_viewer_cmd cmd
;
1595 struct lttng_viewer_new_streams_request rq
;
1596 struct lttng_viewer_new_streams_response rp
;
1597 struct lttng_viewer_stream stream
;
1598 int ret
, i
, nb_streams
= 0;
1600 uint32_t stream_count
;
1601 const size_t cmd_buf_len
= sizeof(cmd
) + sizeof(rq
);
1602 char cmd_buf
[cmd_buf_len
];
1604 if (lttng_live_should_quit()) {
1609 cmd
.cmd
= htobe32(LTTNG_VIEWER_GET_NEW_STREAMS
);
1610 cmd
.data_size
= htobe64((uint64_t) sizeof(rq
));
1611 cmd
.cmd_version
= htobe32(0);
1613 memset(&rq
, 0, sizeof(rq
));
1614 rq
.session_id
= htobe64(id
);
1617 * Merge the cmd and connection request to prevent a write-write
1618 * sequence on the TCP socket. Otherwise, a delayed ACK will prevent the
1619 * second write to be performed quickly in presence of Nagle's algorithm.
1621 memcpy(cmd_buf
, &cmd
, sizeof(cmd
));
1622 memcpy(cmd_buf
+ sizeof(cmd
), &rq
, sizeof(rq
));
1624 ret_len
= lttng_live_send(ctx
->control_sock
, cmd_buf
, cmd_buf_len
);
1626 perror("[error] Error sending get_new_streams cmd and request");
1629 assert(ret_len
== cmd_buf_len
);
1631 ret_len
= lttng_live_recv(ctx
->control_sock
, &rp
, sizeof(rp
));
1633 fprintf(stderr
, "[error] Remote side has closed connection\n");
1637 perror("[error] Error receiving get_new_streams response");
1640 assert(ret_len
== sizeof(rp
));
1642 switch(be32toh(rp
.status
)) {
1643 case LTTNG_VIEWER_NEW_STREAMS_OK
:
1645 case LTTNG_VIEWER_NEW_STREAMS_NO_NEW
:
1648 case LTTNG_VIEWER_NEW_STREAMS_HUP
:
1649 ret
= -LTTNG_VIEWER_NEW_STREAMS_HUP
;
1651 case LTTNG_VIEWER_NEW_STREAMS_ERR
:
1652 fprintf(stderr
, "[error] get_new_streams error\n");
1655 fprintf(stderr
, "[error] Unknown return code %u\n",
1656 be32toh(rp
.status
));
1660 stream_count
= be32toh(rp
.streams_count
);
1661 ctx
->session
->stream_count
+= stream_count
;
1663 * When the session is created but not started, we do an active wait
1664 * until it starts. It allows the viewer to start processing the trace
1665 * as soon as the session starts.
1667 if (ctx
->session
->stream_count
== 0) {
1671 printf_verbose("Waiting for %d streams:\n", stream_count
);
1673 for (i
= 0; i
< stream_count
; i
++) {
1674 struct lttng_live_viewer_stream
*lvstream
;
1676 lvstream
= g_new0(struct lttng_live_viewer_stream
, 1);
1677 ret_len
= lttng_live_recv(ctx
->control_sock
, &stream
,
1680 fprintf(stderr
, "[error] Remote side has closed connection\n");
1685 perror("[error] Error receiving stream");
1689 assert(ret_len
== sizeof(stream
));
1690 stream
.path_name
[LTTNG_VIEWER_PATH_MAX
- 1] = '\0';
1691 stream
.channel_name
[LTTNG_VIEWER_NAME_MAX
- 1] = '\0';
1693 printf_verbose(" stream %" PRIu64
" : %s/%s\n",
1694 be64toh(stream
.id
), stream
.path_name
,
1695 stream
.channel_name
);
1696 lvstream
->id
= be64toh(stream
.id
);
1697 lvstream
->session
= ctx
->session
;
1699 lvstream
->mmap_size
= 0;
1700 lvstream
->ctf_stream_id
= -1ULL;
1702 if (be32toh(stream
.metadata_flag
)) {
1703 lvstream
->metadata_flag
= 1;
1705 ret
= lttng_live_ctf_trace_assign(lvstream
,
1706 be64toh(stream
.ctf_trace_id
));
1712 bt_list_add(&lvstream
->session_stream_node
,
1713 &ctx
->session
->stream_list
);
1723 int lttng_live_read(struct lttng_live_ctx
*ctx
)
1727 struct bt_ctf_iter
*iter
;
1728 const struct bt_ctf_event
*event
;
1729 struct bt_iter_pos begin_pos
;
1730 struct bt_trace_descriptor
*td_write
;
1731 struct bt_format
*fmt_write
;
1732 struct ctf_text_stream_pos
*sout
;
1735 ctx
->bt_ctx
= bt_context_create();
1737 fprintf(stderr
, "[error] bt_context_create allocation\n");
1741 fmt_write
= bt_lookup_format(g_quark_from_static_string("text"));
1743 fprintf(stderr
, "[error] ctf-text error\n");
1747 td_write
= fmt_write
->open_trace(NULL
, O_RDWR
, NULL
, NULL
);
1749 fprintf(stderr
, "[error] Error opening output trace\n");
1753 sout
= container_of(td_write
, struct ctf_text_stream_pos
,
1755 if (!sout
->parent
.event_cb
) {
1759 ret
= lttng_live_create_viewer_session(ctx
);
1764 for (i
= 0; i
< ctx
->session_ids
->len
; i
++) {
1765 id
= g_array_index(ctx
->session_ids
, uint64_t, i
);
1766 printf_verbose("Attaching to session %" PRIu64
"\n", id
);
1767 ret
= lttng_live_attach_session(ctx
, id
);
1768 printf_verbose("Attaching session returns %d\n", ret
);
1770 if (ret
== -LTTNG_VIEWER_ATTACH_UNK
) {
1771 fprintf(stderr
, "[error] Unknown session ID\n");
1778 * As long as the session is active, we try to get new streams.
1783 if (lttng_live_should_quit()) {
1788 while (!ctx
->session
->stream_count
) {
1789 if (lttng_live_should_quit()
1790 || ctx
->session_ids
->len
== 0) {
1794 ret
= ask_new_streams(ctx
);
1799 if (!ctx
->session
->stream_count
) {
1800 (void) poll(NULL
, 0, ACTIVE_POLL_DELAY
);
1804 ret
= add_traces(ctx
);
1809 begin_pos
.type
= BT_SEEK_BEGIN
;
1810 iter
= bt_ctf_iter_create(ctx
->bt_ctx
, &begin_pos
, NULL
);
1812 if (lttng_live_should_quit()) {
1816 fprintf(stderr
, "[error] Iterator creation error\n");
1820 if (lttng_live_should_quit()) {
1824 event
= bt_ctf_iter_read_event_flags(iter
, &flags
);
1825 if (!(flags
& BT_ITER_FLAG_RETRY
)) {
1830 ret
= sout
->parent
.event_cb(&sout
->parent
,
1831 event
->parent
->stream
);
1833 fprintf(stderr
, "[error] Writing "
1838 ret
= bt_iter_next(bt_ctf_get_iter(iter
));
1843 bt_ctf_iter_destroy(iter
);
1844 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1845 del_traces
, ctx
->bt_ctx
);
1846 ctx
->session
->stream_count
= 0;
1850 g_hash_table_foreach_remove(ctx
->session
->ctf_traces
,
1851 del_traces
, ctx
->bt_ctx
);
1852 bt_context_put(ctx
->bt_ctx
);
1854 if (lttng_live_should_quit()) {