formats/lttng-live/lttng-live-comm.c

   1 /*
   2  * Copyright (C) 2013 - Julien Desfossez <jdesfossez@efficios.com>
   3  *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   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:
  11  *
  12  * The above copyright notice and this permission notice shall be included in
  13  * all copies or substantial portions of the Software.
  14  *
  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
  21  * SOFTWARE.
  22  */
  23
  24 #include <sys/socket.h>
  25 #include <sys/types.h>
  26 #include <netinet/in.h>
  27 #include <netdb.h>
  28 #include <stdio.h>
  29 #include <string.h>
  30 #include <stdlib.h>
  31 #include <unistd.h>
  32 #include <errno.h>
  33 #include <inttypes.h>
  34 #include <fcntl.h>
  35 #include <sys/mman.h>
  36 #include <poll.h>
  37
  38 #include <babeltrace/ctf/ctf-index.h>
  39
  40 #include <babeltrace/babeltrace.h>
  41 #include <babeltrace/ctf/events.h>
  42 #include <babeltrace/ctf/callbacks.h>
  43 #include <babeltrace/ctf/iterator.h>
  44
  45 /* for packet_index */
  46 #include <babeltrace/ctf/types.h>
  47
  48 #include <babeltrace/ctf/metadata.h>
  49 #include <babeltrace/ctf-text/types.h>
  50 #include <babeltrace/ctf/events-internal.h>
  51 #include <formats/ctf/events-private.h>
  52
  53 #include <babeltrace/compat/memstream.h>
  54
  55 #include "lttng-live.h"
  56 #include "lttng-viewer-abi.h"
  57
  58 #define ACTIVE_POLL_DELAY       100     /* ms */
  59
  60 /*
  61  * Memory allocation zeroed
  62  */
  63 #define zmalloc(x) calloc(1, x)
  64
  65 #ifndef max_t
  66 #define max_t(type, a, b)       \
  67         ((type) (a) > (type) (b) ? (type) (a) : (type) (b))
  68 #endif
  69
  70 static void ctf_live_packet_seek(struct bt_stream_pos *stream_pos,
  71                 size_t index, int whence);
  72 static void add_traces(gpointer key, gpointer value, gpointer user_data);
  73 static int del_traces(gpointer key, gpointer value, gpointer user_data);
  74 static int get_new_metadata(struct lttng_live_ctx *ctx,
  75                 struct lttng_live_viewer_stream *viewer_stream,
  76                 char **metadata_buf);
  77
  78 static
  79 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
  80 {
  81         ssize_t ret;
  82         size_t copied = 0, to_copy = len;
  83
  84         do {
  85                 ret = recv(fd, buf + copied, to_copy, 0);
  86                 if (ret > 0) {
  87                         assert(ret <= to_copy);
  88                         copied += ret;
  89                         to_copy -= ret;
  90                 }
  91         } while ((ret > 0 && to_copy > 0)
  92                 || (ret < 0 && errno == EINTR));
  93         if (ret > 0)
  94                 ret = copied;
  95         /* ret = 0 means orderly shutdown, ret < 0 is error. */
  96         return ret;
  97 }
  98
  99 static
 100 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
 101 {
 102         ssize_t ret;
 103
 104         do {
 105                 ret = send(fd, buf, len, MSG_NOSIGNAL);
 106         } while (ret < 0 && errno == EINTR);
 107         return ret;
 108 }
 109
 110 int lttng_live_connect_viewer(struct lttng_live_ctx *ctx)
 111 {
 112         struct hostent *host;
 113         struct sockaddr_in server_addr;
 114         int ret;
 115
 116         if (lttng_live_should_quit()) {
 117                 ret = -1;
 118                 goto end;
 119         }
 120
 121         host = gethostbyname(ctx->relay_hostname);
 122         if (!host) {
 123                 fprintf(stderr, "[error] Cannot lookup hostname %s\n",
 124                         ctx->relay_hostname);
 125                 goto error;
 126         }
 127
 128         if ((ctx->control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 129                 perror("Socket");
 130                 goto error;
 131         }
 132
 133         server_addr.sin_family = AF_INET;
 134         server_addr.sin_port = htons(ctx->port);
 135         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 136         bzero(&(server_addr.sin_zero), 8);
 137
 138         if (connect(ctx->control_sock, (struct sockaddr *) &server_addr,
 139                                 sizeof(struct sockaddr)) == -1) {
 140                 perror("Connect");
 141                 goto error;
 142         }
 143
 144         ret = 0;
 145
 146 end:
 147         return ret;
 148
 149 error:
 150         fprintf(stderr, "[error] Connection failed\n");
 151         return -1;
 152 }
 153
 154 int lttng_live_establish_connection(struct lttng_live_ctx *ctx)
 155 {
 156         struct lttng_viewer_cmd cmd;
 157         struct lttng_viewer_connect connect;
 158         int ret;
 159         ssize_t ret_len;
 160
 161         if (lttng_live_should_quit()) {
 162                 ret = -1;
 163                 goto end;
 164         }
 165
 166         cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
 167         cmd.data_size = sizeof(connect);
 168         cmd.cmd_version = 0;
 169
 170         connect.viewer_session_id = -1ULL;      /* will be set on recv */
 171         connect.major = htobe32(LTTNG_LIVE_MAJOR);
 172         connect.minor = htobe32(LTTNG_LIVE_MINOR);
 173         connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
 174
 175         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 176         if (ret_len < 0) {
 177                 perror("[error] Error sending cmd");
 178                 goto error;
 179         }
 180         assert(ret_len == sizeof(cmd));
 181
 182         ret_len = lttng_live_send(ctx->control_sock, &connect, sizeof(connect));
 183         if (ret_len < 0) {
 184                 perror("[error] Error sending version");
 185                 goto error;
 186         }
 187         assert(ret_len == sizeof(connect));
 188
 189         ret_len = lttng_live_recv(ctx->control_sock, &connect, sizeof(connect));
 190         if (ret_len == 0) {
 191                 fprintf(stderr, "[error] Remote side has closed connection\n");
 192                 goto error;
 193         }
 194         if (ret_len < 0) {
 195                 perror("[error] Error receiving version");
 196                 goto error;
 197         }
 198         assert(ret_len == sizeof(connect));
 199
 200         printf_verbose("Received viewer session ID : %" PRIu64 "\n",
 201                         be64toh(connect.viewer_session_id));
 202         printf_verbose("Relayd version : %u.%u\n", be32toh(connect.major),
 203                         be32toh(connect.minor));
 204         ret = 0;
 205 end:
 206         return ret;
 207
 208 error:
 209         fprintf(stderr, "[error] Unable to establish connection\n");
 210         return -1;
 211 }
 212
 213 static
 214 void free_session_list(GPtrArray *session_list)
 215 {
 216         int i;
 217         struct lttng_live_relay_session *relay_session;
 218
 219         for (i = 0; i < session_list->len; i++) {
 220                 relay_session = g_ptr_array_index(session_list, i);
 221                 free(relay_session->name);
 222                 free(relay_session->hostname);
 223         }
 224         g_ptr_array_free(session_list, TRUE);
 225 }
 226
 227 static
 228 void print_session_list(GPtrArray *session_list, const char *path)
 229 {
 230         int i;
 231         struct lttng_live_relay_session *relay_session;
 232
 233         for (i = 0; i < session_list->len; i++) {
 234                 relay_session = g_ptr_array_index(session_list, i);
 235                 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
 236                                 "%u stream(s), %u client(s) connected)\n",
 237                                 path, relay_session->hostname,
 238                                 relay_session->name, relay_session->timer,
 239                                 relay_session->streams, relay_session->clients);
 240         }
 241 }
 242
 243 static
 244 void update_session_list(GPtrArray *session_list, char *hostname,
 245                 char *session_name, uint32_t streams, uint32_t clients,
 246                 uint32_t timer)
 247 {
 248         int i, found = 0;
 249         struct lttng_live_relay_session *relay_session;
 250
 251         for (i = 0; i < session_list->len; i++) {
 252                 relay_session = g_ptr_array_index(session_list, i);
 253                 if ((strncmp(relay_session->hostname, hostname, NAME_MAX) == 0) &&
 254                                 strncmp(relay_session->name,
 255                                         session_name, NAME_MAX) == 0) {
 256                         relay_session->streams += streams;
 257                         if (relay_session->clients < clients)
 258                                 relay_session->clients = clients;
 259                         found = 1;
 260                         break;
 261                 }
 262         }
 263         if (found)
 264                 return;
 265
 266         relay_session = g_new0(struct lttng_live_relay_session, 1);
 267         relay_session->hostname = strndup(hostname, NAME_MAX);
 268         relay_session->name = strndup(session_name, NAME_MAX);
 269         relay_session->clients = clients;
 270         relay_session->streams = streams;
 271         relay_session->timer = timer;
 272         g_ptr_array_add(session_list, relay_session);
 273 }
 274
 275 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
 276 {
 277         struct lttng_viewer_cmd cmd;
 278         struct lttng_viewer_list_sessions list;
 279         struct lttng_viewer_session lsession;
 280         int i, ret, sessions_count, print_list = 0;
 281         ssize_t ret_len;
 282         uint64_t session_id;
 283         GPtrArray *session_list = NULL;
 284
 285         if (lttng_live_should_quit()) {
 286                 ret = -1;
 287                 goto end;
 288         }
 289
 290         if (strlen(ctx->session_name) == 0) {
 291                 print_list = 1;
 292                 session_list = g_ptr_array_new();
 293         }
 294
 295         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 296         cmd.data_size = 0;
 297         cmd.cmd_version = 0;
 298
 299         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 300         if (ret_len < 0) {
 301                 perror("[error] Error sending cmd");
 302                 goto error;
 303         }
 304         assert(ret_len == sizeof(cmd));
 305
 306         ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
 307         if (ret_len == 0) {
 308                 fprintf(stderr, "[error] Remote side has closed connection\n");
 309                 goto error;
 310         }
 311         if (ret_len < 0) {
 312                 perror("[error] Error receiving session list");
 313                 goto error;
 314         }
 315         assert(ret_len == sizeof(list));
 316
 317         sessions_count = be32toh(list.sessions_count);
 318         for (i = 0; i < sessions_count; i++) {
 319                 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
 320                 if (ret_len == 0) {
 321                         fprintf(stderr, "[error] Remote side has closed connection\n");
 322                         goto error;
 323                 }
 324                 if (ret_len < 0) {
 325                         perror("[error] Error receiving session");
 326                         goto error;
 327                 }
 328                 assert(ret_len == sizeof(lsession));
 329                 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
 330                 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 331                 session_id = be64toh(lsession.id);
 332
 333                 if (print_list) {
 334                         update_session_list(session_list,
 335                                         lsession.hostname,
 336                                         lsession.session_name,
 337                                         be32toh(lsession.streams),
 338                                         be32toh(lsession.clients),
 339                                         be32toh(lsession.live_timer));
 340                 } else {
 341                         if ((strncmp(lsession.session_name, ctx->session_name,
 342                                 NAME_MAX) == 0) && (strncmp(lsession.hostname,
 343                                         ctx->traced_hostname, NAME_MAX) == 0)) {
 344                                 printf_verbose("Reading from session %" PRIu64 "\n",
 345                                                 session_id);
 346                                 g_array_append_val(ctx->session_ids,
 347                                                 session_id);
 348                         }
 349                 }
 350         }
 351
 352         if (print_list) {
 353                 print_session_list(session_list, path);
 354                 free_session_list(session_list);
 355         }
 356         ret = 0;
 357 end:
 358         return ret;
 359
 360 error:
 361         fprintf(stderr, "[error] Unable to list sessions\n");
 362         return -1;
 363 }
 364
 365 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
 366                 uint64_t ctf_trace_id)
 367 {
 368         struct lttng_live_ctf_trace *trace;
 369         int ret = 0;
 370
 371         trace = g_hash_table_lookup(stream->session->ctf_traces,
 372                         (gpointer) ctf_trace_id);
 373         if (!trace) {
 374                 trace = g_new0(struct lttng_live_ctf_trace, 1);
 375                 trace->ctf_trace_id = ctf_trace_id;
 376                 trace->streams = g_ptr_array_new();
 377                 g_hash_table_insert(stream->session->ctf_traces,
 378                                 (gpointer) ctf_trace_id,
 379                                 trace);
 380         }
 381         if (stream->metadata_flag)
 382                 trace->metadata_stream = stream;
 383
 384         stream->ctf_trace = trace;
 385         g_ptr_array_add(trace->streams, stream);
 386
 387         return ret;
 388 }
 389
 390 static
 391 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
 392                 char **metadata_buf, size_t *size)
 393 {
 394         int ret = 0;
 395
 396         stream->metadata_fp_write =
 397                 babeltrace_open_memstream(metadata_buf, size);
 398         if (!stream->metadata_fp_write) {
 399                 perror("Metadata open_memstream");
 400                 ret = -1;
 401         }
 402
 403         return ret;
 404 }
 405
 406 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
 407 {
 408         struct lttng_viewer_cmd cmd;
 409         struct lttng_viewer_attach_session_request rq;
 410         struct lttng_viewer_attach_session_response rp;
 411         struct lttng_viewer_stream stream;
 412         int ret, i;
 413         ssize_t ret_len;
 414
 415         if (lttng_live_should_quit()) {
 416                 ret = -1;
 417                 goto end;
 418         }
 419
 420         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 421         cmd.data_size = sizeof(rq);
 422         cmd.cmd_version = 0;
 423
 424         memset(&rq, 0, sizeof(rq));
 425         rq.session_id = htobe64(id);
 426         // TODO: add cmd line parameter to select seek beginning
 427         // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 428         rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
 429
 430         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 431         if (ret_len < 0) {
 432                 perror("[error] Error sending cmd");
 433                 goto error;
 434         }
 435         assert(ret_len == sizeof(cmd));
 436
 437         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 438         if (ret_len < 0) {
 439                 perror("[error] Error sending attach request");
 440                 goto error;
 441         }
 442         assert(ret_len == sizeof(rq));
 443
 444         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 445         if (ret_len == 0) {
 446                 fprintf(stderr, "[error] Remote side has closed connection\n");
 447                 goto error;
 448         }
 449         if (ret_len < 0) {
 450                 perror("[error] Error receiving attach response");
 451                 goto error;
 452         }
 453         assert(ret_len == sizeof(rp));
 454
 455         switch(be32toh(rp.status)) {
 456         case LTTNG_VIEWER_ATTACH_OK:
 457                 break;
 458         case LTTNG_VIEWER_ATTACH_UNK:
 459                 ret = -LTTNG_VIEWER_ATTACH_UNK;
 460                 goto end;
 461         case LTTNG_VIEWER_ATTACH_ALREADY:
 462                 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
 463                 goto error;
 464         case LTTNG_VIEWER_ATTACH_NOT_LIVE:
 465                 fprintf(stderr, "[error] Not a live session\n");
 466                 goto error;
 467         case LTTNG_VIEWER_ATTACH_SEEK_ERR:
 468                 fprintf(stderr, "[error] Wrong seek parameter\n");
 469                 goto error;
 470         default:
 471                 fprintf(stderr, "[error] Unknown attach return code %u\n",
 472                                 be32toh(rp.status));
 473                 goto error;
 474         }
 475         if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
 476                 goto error;
 477         }
 478
 479         ctx->session->stream_count += be32toh(rp.streams_count);
 480         /*
 481          * When the session is created but not started, we do an active wait
 482          * until it starts. It allows the viewer to start processing the trace
 483          * as soon as the session starts.
 484          */
 485         if (ctx->session->stream_count == 0) {
 486                 ret = 0;
 487                 goto end;
 488         }
 489         printf_verbose("Waiting for %" PRIu64 " streams:\n",
 490                 ctx->session->stream_count);
 491         ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
 492                         ctx->session->stream_count);
 493         for (i = 0; i < be32toh(rp.streams_count); i++) {
 494                 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
 495                 if (ret_len == 0) {
 496                         fprintf(stderr, "[error] Remote side has closed connection\n");
 497                         goto error;
 498                 }
 499                 if (ret_len < 0) {
 500                         perror("[error] Error receiving stream");
 501                         goto error;
 502                 }
 503                 assert(ret_len == sizeof(stream));
 504                 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
 505                 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 506
 507                 printf_verbose("    stream %" PRIu64 " : %s/%s\n",
 508                                 be64toh(stream.id), stream.path_name,
 509                                 stream.channel_name);
 510                 ctx->session->streams[i].id = be64toh(stream.id);
 511                 ctx->session->streams[i].session = ctx->session;
 512
 513                 ctx->session->streams[i].first_read = 1;
 514                 ctx->session->streams[i].mmap_size = 0;
 515
 516                 if (be32toh(stream.metadata_flag)) {
 517                         ctx->session->streams[i].metadata_flag = 1;
 518                 }
 519                 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
 520                                 be64toh(stream.ctf_trace_id));
 521                 if (ret < 0) {
 522                         goto error;
 523                 }
 524
 525         }
 526         ret = 0;
 527 end:
 528         return ret;
 529
 530 error:
 531         return -1;
 532 }
 533
 534 static
 535 int ask_new_streams(struct lttng_live_ctx *ctx)
 536 {
 537         int i, ret = 0;
 538         uint64_t id;
 539
 540 restart:
 541         for (i = 0; i < ctx->session_ids->len; i++) {
 542                 id = g_array_index(ctx->session_ids, uint64_t, i);
 543                 ret = lttng_live_get_new_streams(ctx, id);
 544                 printf_verbose("Asking for new streams returns %d\n",
 545                                 ret);
 546                 if (ret < 0) {
 547                         if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
 548                                 printf_verbose("Session %" PRIu64 " closed\n",
 549                                                 id);
 550                                 /*
 551                                  * The streams have already been closed during
 552                                  * the reading, so we only need to get rid of
 553                                  * the trace in our internal table of sessions.
 554                                  */
 555                                 g_array_remove_index(ctx->session_ids, i);
 556                                 /*
 557                                  * We can't continue iterating on the g_array
 558                                  * after a remove, we have to start again.
 559                                  */
 560                                 goto restart;
 561                         } else {
 562                                 ret = -1;
 563                                 goto end;
 564                         }
 565                 }
 566         }
 567
 568 end:
 569         return ret;
 570 }
 571
 572 static
 573 int append_metadata(struct lttng_live_ctx *ctx,
 574                 struct lttng_live_viewer_stream *viewer_stream)
 575 {
 576         int ret;
 577         struct lttng_live_viewer_stream *metadata;
 578         char *metadata_buf = NULL;
 579
 580         printf_verbose("get_next_index: new metadata needed\n");
 581         ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
 582         if (ret < 0) {
 583                 free(metadata_buf);
 584                 goto error;
 585         }
 586
 587         metadata = viewer_stream->ctf_trace->metadata_stream;
 588         metadata->ctf_trace->metadata_fp =
 589                 babeltrace_fmemopen(metadata_buf,
 590                                 metadata->metadata_len, "rb");
 591         if (!metadata->ctf_trace->metadata_fp) {
 592                 perror("Metadata fmemopen");
 593                 free(metadata_buf);
 594                 ret = -1;
 595                 goto error;
 596         }
 597         ret = ctf_append_trace_metadata(
 598                         viewer_stream->ctf_trace->handle->td,
 599                         metadata->ctf_trace->metadata_fp);
 600         /* We accept empty metadata packets */
 601         if (ret != 0 && ret != -ENOENT) {
 602                 fprintf(stderr, "[error] Appending metadata\n");
 603                 goto error;
 604         }
 605         ret = 0;
 606
 607 error:
 608         return ret;
 609 }
 610
 611 static
 612 int get_data_packet(struct lttng_live_ctx *ctx,
 613                 struct ctf_stream_pos *pos,
 614                 struct lttng_live_viewer_stream *stream, uint64_t offset,
 615                 uint64_t len)
 616 {
 617         struct lttng_viewer_cmd cmd;
 618         struct lttng_viewer_get_packet rq;
 619         struct lttng_viewer_trace_packet rp;
 620         ssize_t ret_len;
 621         int ret;
 622
 623 retry:
 624         if (lttng_live_should_quit()) {
 625                 ret = -1;
 626                 goto end;
 627         }
 628         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
 629         cmd.data_size = sizeof(rq);
 630         cmd.cmd_version = 0;
 631
 632         memset(&rq, 0, sizeof(rq));
 633         rq.stream_id = htobe64(stream->id);
 634         rq.offset = htobe64(offset);
 635         rq.len = htobe32(len);
 636
 637         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 638         if (ret_len < 0) {
 639                 perror("[error] Error sending cmd");
 640                 goto error;
 641         }
 642         assert(ret_len == sizeof(cmd));
 643
 644         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 645         if (ret_len < 0) {
 646                 perror("[error] Error sending get_data_packet request");
 647                 goto error;
 648         }
 649         assert(ret_len == sizeof(rq));
 650
 651         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 652         if (ret_len == 0) {
 653                 fprintf(stderr, "[error] Remote side has closed connection\n");
 654                 goto error;
 655         }
 656         if (ret_len < 0) {
 657                 perror("[error] Error receiving data response");
 658                 goto error;
 659         }
 660         if (ret_len != sizeof(rp)) {
 661                 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
 662                                 ", received %" PRId64 "\n", sizeof(rp),
 663                                 ret_len);
 664                 goto error;
 665         }
 666
 667         rp.flags = be32toh(rp.flags);
 668
 669         switch (be32toh(rp.status)) {
 670         case LTTNG_VIEWER_GET_PACKET_OK:
 671                 len = be32toh(rp.len);
 672                 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
 673                                 "\n", len);
 674                 break;
 675         case LTTNG_VIEWER_GET_PACKET_RETRY:
 676                 /* Unimplemented by relay daemon */
 677                 printf_verbose("get_data_packet: retry\n");
 678                 goto error;
 679         case LTTNG_VIEWER_GET_PACKET_ERR:
 680                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 681                         printf_verbose("get_data_packet: new metadata needed\n");
 682                         ret = append_metadata(ctx, stream);
 683                         if (ret)
 684                                 goto error;
 685                 }
 686                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
 687                         printf_verbose("get_data_packet: new streams needed\n");
 688                         ret = ask_new_streams(ctx);
 689                         if (ret < 0)
 690                                 goto error;
 691                         g_hash_table_foreach(ctx->session->ctf_traces,
 692                                         add_traces, ctx->bt_ctx);
 693                 }
 694                 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
 695                                 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
 696                         goto retry;
 697                 }
 698                 fprintf(stderr, "[error] get_data_packet: error\n");
 699                 goto error;
 700         case LTTNG_VIEWER_GET_PACKET_EOF:
 701                 ret = -2;
 702                 goto end;
 703         default:
 704                 printf_verbose("get_data_packet: unknown\n");
 705                 goto error;
 706         }
 707
 708         if (len == 0) {
 709                 goto error;
 710         }
 711
 712         if (len > stream->mmap_size) {
 713                 uint64_t new_size;
 714
 715                 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
 716                 if (pos->base_mma) {
 717                         /* unmap old base */
 718                         ret = munmap_align(pos->base_mma);
 719                         if (ret) {
 720                                 perror("[error] Unable to unmap old base");
 721                                 goto error;
 722                         }
 723                         pos->base_mma = NULL;
 724                 }
 725                 pos->base_mma = mmap_align(new_size,
 726                                 PROT_READ | PROT_WRITE,
 727                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 728                 if (pos->base_mma == MAP_FAILED) {
 729                         perror("[error] mmap error");
 730                         pos->base_mma = NULL;
 731                         goto error;
 732                 }
 733
 734                 stream->mmap_size = new_size;
 735                 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
 736                                 stream->mmap_size);
 737         }
 738
 739         ret_len = lttng_live_recv(ctx->control_sock,
 740                         mmap_align_addr(pos->base_mma), len);
 741         if (ret_len == 0) {
 742                 fprintf(stderr, "[error] Remote side has closed connection\n");
 743                 goto error;
 744         }
 745         if (ret_len < 0) {
 746                 perror("[error] Error receiving trace packet");
 747                 goto error;
 748         }
 749         assert(ret_len == len);
 750         ret = 0;
 751 end:
 752         return ret;
 753
 754 error:
 755         return -1;
 756 }
 757
 758 static
 759 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
 760                 struct lttng_live_viewer_stream *metadata_stream)
 761 {
 762         uint64_t len = 0;
 763         int ret;
 764         struct lttng_viewer_cmd cmd;
 765         struct lttng_viewer_get_metadata rq;
 766         struct lttng_viewer_metadata_packet rp;
 767         char *data = NULL;
 768         ssize_t ret_len;
 769
 770         if (lttng_live_should_quit()) {
 771                 ret = -1;
 772                 goto end;
 773         }
 774
 775         rq.stream_id = htobe64(metadata_stream->id);
 776         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 777         cmd.data_size = sizeof(rq);
 778         cmd.cmd_version = 0;
 779
 780         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 781         if (ret_len < 0) {
 782                 perror("[error] Error sending cmd");
 783                 goto error;
 784         }
 785         assert(ret_len == sizeof(cmd));
 786
 787         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 788         if (ret_len < 0) {
 789                 perror("[error] Error sending get_metadata request");
 790                 goto error;
 791         }
 792         assert(ret_len == sizeof(rq));
 793
 794         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 795         if (ret_len == 0) {
 796                 fprintf(stderr, "[error] Remote side has closed connection\n");
 797                 goto error;
 798         }
 799         if (ret_len < 0) {
 800                 perror("[error] Error receiving metadata response");
 801                 goto error;
 802         }
 803         assert(ret_len == sizeof(rp));
 804
 805         switch (be32toh(rp.status)) {
 806                 case LTTNG_VIEWER_METADATA_OK:
 807                         printf_verbose("get_metadata : OK\n");
 808                         break;
 809                 case LTTNG_VIEWER_NO_NEW_METADATA:
 810                         printf_verbose("get_metadata : NO NEW\n");
 811                         ret = 0;
 812                         goto end;
 813                 case LTTNG_VIEWER_METADATA_ERR:
 814                         printf_verbose("get_metadata : ERR\n");
 815                         goto error;
 816                 default:
 817                         printf_verbose("get_metadata : UNKNOWN\n");
 818                         goto error;
 819         }
 820
 821         len = be64toh(rp.len);
 822         printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
 823         if (len <= 0) {
 824                 goto error;
 825         }
 826
 827         data = zmalloc(len);
 828         if (!data) {
 829                 perror("relay data zmalloc");
 830                 goto error;
 831         }
 832         ret_len = lttng_live_recv(ctx->control_sock, data, len);
 833         if (ret_len == 0) {
 834                 fprintf(stderr, "[error] Remote side has closed connection\n");
 835                 goto error_free_data;
 836         }
 837         if (ret_len < 0) {
 838                 perror("[error] Error receiving trace packet");
 839                 goto error_free_data;
 840         }
 841         assert(ret_len == len);
 842
 843         do {
 844                 ret_len = fwrite(data, 1, len,
 845                                 metadata_stream->metadata_fp_write);
 846         } while (ret_len < 0 && errno == EINTR);
 847         if (ret_len < 0) {
 848                 fprintf(stderr, "[error] Writing in the metadata fp\n");
 849                 goto error_free_data;
 850         }
 851         assert(ret_len == len);
 852         metadata_stream->metadata_len += len;
 853         free(data);
 854         ret = len;
 855 end:
 856         return ret;
 857
 858 error_free_data:
 859         free(data);
 860 error:
 861         return -1;
 862 }
 863
 864 /*
 865  * Return 0 on success, a negative value on error.
 866  */
 867 static
 868 int get_new_metadata(struct lttng_live_ctx *ctx,
 869                 struct lttng_live_viewer_stream *viewer_stream,
 870                 char **metadata_buf)
 871 {
 872         int ret = 0;
 873         struct lttng_live_viewer_stream *metadata_stream;
 874         size_t size, len_read = 0;;
 875
 876         metadata_stream = viewer_stream->ctf_trace->metadata_stream;
 877         if (!metadata_stream) {
 878                 fprintf(stderr, "[error] No metadata stream\n");
 879                 ret = -1;
 880                 goto error;
 881         }
 882         metadata_stream->metadata_len = 0;
 883         ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
 884         if (ret < 0) {
 885                 goto error;
 886         }
 887
 888         do {
 889                 /*
 890                  * get_one_metadata_packet returns the number of bytes
 891                  * received, 0 when we have received everything, a
 892                  * negative value on error.
 893                  */
 894                 ret = get_one_metadata_packet(ctx, metadata_stream);
 895                 if (ret > 0) {
 896                         len_read += ret;
 897                 }
 898                 if (!len_read) {
 899                         (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
 900                 }
 901         } while (ret > 0 || !len_read);
 902
 903         if (fclose(metadata_stream->metadata_fp_write))
 904                 perror("fclose");
 905         metadata_stream->metadata_fp_write = NULL;
 906
 907 error:
 908         return ret;
 909 }
 910
 911 /*
 912  * Get one index for a stream.
 913  *
 914  * Returns 0 on success or a negative value on error.
 915  */
 916 static
 917 int get_next_index(struct lttng_live_ctx *ctx,
 918                 struct lttng_live_viewer_stream *viewer_stream,
 919                 struct packet_index *index)
 920 {
 921         struct lttng_viewer_cmd cmd;
 922         struct lttng_viewer_get_next_index rq;
 923         struct lttng_viewer_index rp;
 924         int ret;
 925         ssize_t ret_len;
 926
 927         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
 928         cmd.data_size = sizeof(rq);
 929         cmd.cmd_version = 0;
 930
 931         memset(&rq, 0, sizeof(rq));
 932         rq.stream_id = htobe64(viewer_stream->id);
 933
 934 retry:
 935         if (lttng_live_should_quit()) {
 936                 ret = -1;
 937                 goto end;
 938         }
 939         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 940         if (ret_len < 0) {
 941                 perror("[error] Error sending cmd");
 942                 goto error;
 943         }
 944         assert(ret_len == sizeof(cmd));
 945
 946         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 947         if (ret_len < 0) {
 948                 perror("[error] Error sending get_next_index request");
 949                 goto error;
 950         }
 951         assert(ret_len == sizeof(rq));
 952
 953         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 954         if (ret_len == 0) {
 955                 fprintf(stderr, "[error] Remote side has closed connection\n");
 956                 goto error;
 957         }
 958         if (ret_len < 0) {
 959                 perror("[error] Error receiving index response");
 960                 goto error;
 961         }
 962         assert(ret_len == sizeof(rp));
 963
 964         rp.flags = be32toh(rp.flags);
 965
 966         switch (be32toh(rp.status)) {
 967         case LTTNG_VIEWER_INDEX_INACTIVE:
 968                 printf_verbose("get_next_index: inactive\n");
 969                 memset(index, 0, sizeof(struct packet_index));
 970                 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
 971                 break;
 972         case LTTNG_VIEWER_INDEX_OK:
 973                 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
 974                                 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
 975                 index->offset = be64toh(rp.offset);
 976                 index->packet_size = be64toh(rp.packet_size);
 977                 index->content_size = be64toh(rp.content_size);
 978                 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
 979                 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
 980                 index->events_discarded = be64toh(rp.events_discarded);
 981
 982                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 983                         ret = append_metadata(ctx, viewer_stream);
 984                         if (ret)
 985                                 goto error;
 986                 }
 987                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
 988                         ret = ask_new_streams(ctx);
 989                         if (ret < 0)
 990                                 goto error;
 991                         g_hash_table_foreach(ctx->session->ctf_traces,
 992                                         add_traces, ctx->bt_ctx);
 993                 }
 994                 break;
 995         case LTTNG_VIEWER_INDEX_RETRY:
 996                 printf_verbose("get_next_index: retry\n");
 997                 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
 998                 goto retry;
 999         case LTTNG_VIEWER_INDEX_HUP:
1000                 printf_verbose("get_next_index: stream hung up\n");
1001                 viewer_stream->id = -1ULL;
1002                 index->offset = EOF;
1003                 ctx->session->stream_count--;
1004                 break;
1005         case LTTNG_VIEWER_INDEX_ERR:
1006                 fprintf(stderr, "[error] get_next_index: error\n");
1007                 goto error;
1008         default:
1009                 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1010                 goto error;
1011         }
1012         ret = 0;
1013 end:
1014         return ret;
1015
1016 error:
1017         return -1;
1018 }
1019
1020 static
1021 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1022                 int whence)
1023 {
1024         struct ctf_stream_pos *pos;
1025         struct ctf_file_stream *file_stream;
1026         struct packet_index *prev_index = NULL, *cur_index;
1027         struct lttng_live_viewer_stream *viewer_stream;
1028         struct lttng_live_session *session;
1029         int ret;
1030
1031 retry:
1032         pos = ctf_pos(stream_pos);
1033         file_stream = container_of(pos, struct ctf_file_stream, pos);
1034         viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1035         session = viewer_stream->session;
1036
1037         switch (pos->packet_index->len) {
1038         case 0:
1039                 g_array_set_size(pos->packet_index, 1);
1040                 cur_index = &g_array_index(pos->packet_index,
1041                                 struct packet_index, 0);
1042                 break;
1043         case 1:
1044                 g_array_set_size(pos->packet_index, 2);
1045                 prev_index = &g_array_index(pos->packet_index,
1046                                 struct packet_index, 0);
1047                 cur_index = &g_array_index(pos->packet_index,
1048                                 struct packet_index, 1);
1049                 break;
1050         case 2:
1051                 g_array_index(pos->packet_index,
1052                         struct packet_index, 0) =
1053                                 g_array_index(pos->packet_index,
1054                                         struct packet_index, 1);
1055                 prev_index = &g_array_index(pos->packet_index,
1056                                 struct packet_index, 0);
1057                 cur_index = &g_array_index(pos->packet_index,
1058                                 struct packet_index, 1);
1059                 break;
1060         default:
1061                 abort();
1062                 break;
1063         }
1064         printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1065         ret = get_next_index(session->ctx, viewer_stream, cur_index);
1066         if (ret < 0) {
1067                 pos->offset = EOF;
1068                 fprintf(stderr, "[error] get_next_index failed\n");
1069                 return;
1070         }
1071
1072         pos->packet_size = cur_index->packet_size;
1073         pos->content_size = cur_index->content_size;
1074         pos->mmap_base_offset = 0;
1075         if (cur_index->offset == EOF) {
1076                 pos->offset = EOF;
1077         } else {
1078                 pos->offset = 0;
1079         }
1080
1081         if (cur_index->content_size == 0) {
1082                 file_stream->parent.cycles_timestamp =
1083                                 cur_index->ts_cycles.timestamp_end;
1084                 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1085                                 &file_stream->parent,
1086                                 cur_index->ts_cycles.timestamp_end);
1087         } else {
1088                 /* Convert the timestamps and append to the real_index. */
1089                 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1090                                 &file_stream->parent,
1091                                 cur_index->ts_cycles.timestamp_begin);
1092                 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1093                                 &file_stream->parent,
1094                                 cur_index->ts_cycles.timestamp_end);
1095
1096                 ctf_update_current_packet_index(&file_stream->parent,
1097                                 prev_index, cur_index);
1098
1099                 file_stream->parent.cycles_timestamp =
1100                                 cur_index->ts_cycles.timestamp_begin;
1101                 file_stream->parent.real_timestamp =
1102                                 cur_index->ts_real.timestamp_begin;
1103         }
1104
1105         if (pos->packet_size == 0 || pos->offset == EOF) {
1106                 goto end;
1107         }
1108
1109         printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1110                         viewer_stream->id);
1111         ret = get_data_packet(session->ctx, pos, viewer_stream,
1112                         cur_index->offset,
1113                         cur_index->packet_size / CHAR_BIT);
1114         if (ret == -2) {
1115                 goto retry;
1116         } else if (ret < 0) {
1117                 pos->offset = EOF;
1118                 fprintf(stderr, "[error] get_data_packet failed\n");
1119                 return;
1120         }
1121
1122         printf_verbose("Index received : packet_size : %" PRIu64
1123                         ", offset %" PRIu64 ", content_size %" PRIu64
1124                         ", timestamp_end : %" PRIu64 "\n",
1125                         cur_index->packet_size, cur_index->offset,
1126                         cur_index->content_size,
1127                         cur_index->ts_cycles.timestamp_end);
1128
1129         /* update trace_packet_header and stream_packet_context */
1130         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1131                 /* Read packet header */
1132                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1133                 if (ret) {
1134                         pos->offset = EOF;
1135                         fprintf(stderr, "[error] trace packet header read failed\n");
1136                         goto end;
1137                 }
1138         }
1139         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1140                 /* Read packet context */
1141                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1142                 if (ret) {
1143                         pos->offset = EOF;
1144                         fprintf(stderr, "[error] stream packet context read failed\n");
1145                         goto end;
1146                 }
1147         }
1148         pos->data_offset = pos->offset;
1149
1150 end:
1151         return;
1152 }
1153
1154 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1155 {
1156         struct lttng_viewer_cmd cmd;
1157         struct lttng_viewer_create_session_response resp;
1158         int ret;
1159         ssize_t ret_len;
1160
1161         if (lttng_live_should_quit()) {
1162                 ret = -1;
1163                 goto end;
1164         }
1165
1166         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1167         cmd.data_size = 0;
1168         cmd.cmd_version = 0;
1169
1170         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1171         if (ret_len < 0) {
1172                 perror("[error] Error sending cmd");
1173                 goto error;
1174         }
1175         assert(ret_len == sizeof(cmd));
1176
1177         ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1178         if (ret_len == 0) {
1179                 fprintf(stderr, "[error] Remote side has closed connection\n");
1180                 goto error;
1181         }
1182         if (ret_len < 0) {
1183                 perror("[error] Error receiving create session reply");
1184                 goto error;
1185         }
1186         assert(ret_len == sizeof(resp));
1187
1188         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1189                 fprintf(stderr, "[error] Error creating viewer session\n");
1190                 goto error;
1191         }
1192         ret = 0;
1193 end:
1194         return ret;
1195
1196 error:
1197         return -1;
1198 }
1199
1200 static
1201 int del_traces(gpointer key, gpointer value, gpointer user_data)
1202 {
1203         struct bt_context *bt_ctx = user_data;
1204         struct lttng_live_ctf_trace *trace = value;
1205         int ret;
1206
1207         ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1208         if (ret < 0)
1209                 fprintf(stderr, "[error] removing trace from context\n");
1210
1211         /* remove the key/value pair from the HT. */
1212         return 1;
1213 }
1214
1215 static
1216 void add_traces(gpointer key, gpointer value, gpointer user_data)
1217 {
1218         int i, ret;
1219         struct bt_context *bt_ctx = user_data;
1220         struct lttng_live_ctf_trace *trace = value;
1221         struct lttng_live_viewer_stream *stream;
1222         struct bt_mmap_stream *new_mmap_stream;
1223         struct bt_mmap_stream_list mmap_list;
1224         struct lttng_live_ctx *ctx = NULL;
1225         struct bt_trace_descriptor *td;
1226         struct bt_trace_handle *handle;
1227
1228         /*
1229          * We don't know how many streams we will receive for a trace, so
1230          * once we are done receiving the traces, we add all the traces
1231          * received to the bt_context.
1232          * We can receive streams during the attach command or the
1233          * get_new_streams, so we have to make sure not to add multiple
1234          * times the same traces.
1235          * If a trace is already in the context, we just skip this function.
1236          */
1237         if (trace->in_use)
1238                 return;
1239
1240         BT_INIT_LIST_HEAD(&mmap_list.head);
1241
1242         for (i = 0; i < trace->streams->len; i++) {
1243                 stream = g_ptr_array_index(trace->streams, i);
1244                 ctx = stream->session->ctx;
1245
1246                 if (!stream->metadata_flag) {
1247                         new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1248                         new_mmap_stream->priv = (void *) stream;
1249                         new_mmap_stream->fd = -1;
1250                         bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1251                 } else {
1252                         char *metadata_buf = NULL;
1253
1254                         /* Get all possible metadata before starting */
1255                         ret = get_new_metadata(ctx, stream, &metadata_buf);
1256                         if (ret) {
1257                                 free(metadata_buf);
1258                                 goto end_free;
1259                         }
1260                         if (!stream->metadata_len) {
1261                                 fprintf(stderr, "[error] empty metadata\n");
1262                                 ret = -1;
1263                                 free(metadata_buf);
1264                                 goto end_free;
1265                         }
1266
1267                         trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1268                                         stream->metadata_len, "rb");
1269                         if (!trace->metadata_fp) {
1270                                 perror("Metadata fmemopen");
1271                                 ret = -1;
1272                                 free(metadata_buf);
1273                                 goto end_free;
1274                         }
1275                 }
1276         }
1277
1278         if (!trace->metadata_fp) {
1279                 fprintf(stderr, "[error] No metadata stream opened\n");
1280                 goto end_free;
1281         }
1282
1283         ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1284                         ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1285         if (ret < 0) {
1286                 fprintf(stderr, "[error] Error adding trace\n");
1287                 goto end_free;
1288         }
1289         trace->metadata_stream->metadata_len = 0;
1290
1291         handle = (struct bt_trace_handle *) g_hash_table_lookup(
1292                         bt_ctx->trace_handles,
1293                         (gpointer) (unsigned long) ret);
1294         td = handle->td;
1295         trace->handle = handle;
1296         if (bt_ctx->current_iterator) {
1297                 bt_iter_add_trace(bt_ctx->current_iterator, td);
1298         }
1299
1300         trace->trace_id = ret;
1301         trace->in_use = 1;
1302
1303         goto end;
1304
1305 end_free:
1306         bt_context_put(bt_ctx);
1307 end:
1308         return;
1309 }
1310
1311 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1312 {
1313         struct lttng_viewer_cmd cmd;
1314         struct lttng_viewer_new_streams_request rq;
1315         struct lttng_viewer_new_streams_response rp;
1316         struct lttng_viewer_stream stream;
1317         int ret, i;
1318         ssize_t ret_len;
1319         uint32_t stream_count;
1320
1321         if (lttng_live_should_quit()) {
1322                 ret = -1;
1323                 goto end;
1324         }
1325
1326         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1327         cmd.data_size = sizeof(rq);
1328         cmd.cmd_version = 0;
1329
1330         memset(&rq, 0, sizeof(rq));
1331         rq.session_id = htobe64(id);
1332
1333         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1334         if (ret_len < 0) {
1335                 perror("[error] Error sending cmd");
1336                 goto error;
1337         }
1338         assert(ret_len == sizeof(cmd));
1339
1340         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
1341         if (ret_len < 0) {
1342                 perror("[error] Error sending get_new_streams request");
1343                 goto error;
1344         }
1345         assert(ret_len == sizeof(rq));
1346
1347         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1348         if (ret_len == 0) {
1349                 fprintf(stderr, "[error] Remote side has closed connection\n");
1350                 goto error;
1351         }
1352         if (ret_len < 0) {
1353                 perror("[error] Error receiving get_new_streams response");
1354                 goto error;
1355         }
1356         assert(ret_len == sizeof(rp));
1357
1358         switch(be32toh(rp.status)) {
1359         case LTTNG_VIEWER_NEW_STREAMS_OK:
1360                 break;
1361         case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1362                 ret = 0;
1363                 goto end;
1364         case LTTNG_VIEWER_NEW_STREAMS_HUP:
1365                 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1366                 goto end;
1367         case LTTNG_VIEWER_NEW_STREAMS_ERR:
1368                 fprintf(stderr, "[error] get_new_streams error\n");
1369                 goto error;
1370         default:
1371                 fprintf(stderr, "[error] Unknown return code %u\n",
1372                                 be32toh(rp.status));
1373                 goto error;
1374         }
1375
1376         stream_count = be32toh(rp.streams_count);
1377         ctx->session->stream_count += stream_count;
1378         /*
1379          * When the session is created but not started, we do an active wait
1380          * until it starts. It allows the viewer to start processing the trace
1381          * as soon as the session starts.
1382          */
1383         if (ctx->session->stream_count == 0) {
1384                 ret = 0;
1385                 goto end;
1386         }
1387         printf_verbose("Waiting for %" PRIu64 " streams:\n",
1388                 ctx->session->stream_count);
1389         ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1390                         ctx->session->stream_count);
1391         for (i = 0; i < stream_count; i++) {
1392                 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1393                 if (ret_len == 0) {
1394                         fprintf(stderr, "[error] Remote side has closed connection\n");
1395                         goto error;
1396                 }
1397                 if (ret_len < 0) {
1398                         perror("[error] Error receiving stream");
1399                         goto error;
1400                 }
1401                 assert(ret_len == sizeof(stream));
1402                 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1403                 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1404
1405                 printf_verbose("    stream %" PRIu64 " : %s/%s\n",
1406                                 be64toh(stream.id), stream.path_name,
1407                                 stream.channel_name);
1408                 ctx->session->streams[i].id = be64toh(stream.id);
1409                 ctx->session->streams[i].session = ctx->session;
1410
1411                 ctx->session->streams[i].first_read = 1;
1412                 ctx->session->streams[i].mmap_size = 0;
1413
1414                 if (be32toh(stream.metadata_flag)) {
1415                         ctx->session->streams[i].metadata_flag = 1;
1416                 }
1417                 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1418                                 be64toh(stream.ctf_trace_id));
1419                 if (ret < 0) {
1420                         goto error;
1421                 }
1422
1423         }
1424         ret = 0;
1425 end:
1426         return ret;
1427
1428 error:
1429         return -1;
1430 }
1431
1432 void lttng_live_read(struct lttng_live_ctx *ctx)
1433 {
1434         int ret, i;
1435         struct bt_ctf_iter *iter;
1436         const struct bt_ctf_event *event;
1437         struct bt_iter_pos begin_pos;
1438         struct bt_trace_descriptor *td_write;
1439         struct bt_format *fmt_write;
1440         struct ctf_text_stream_pos *sout;
1441         uint64_t id;
1442
1443         ctx->bt_ctx = bt_context_create();
1444         if (!ctx->bt_ctx) {
1445                 fprintf(stderr, "[error] bt_context_create allocation\n");
1446                 goto end;
1447         }
1448
1449         fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1450         if (!fmt_write) {
1451                 fprintf(stderr, "[error] ctf-text error\n");
1452                 goto end;
1453         }
1454
1455         td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1456         if (!td_write) {
1457                 fprintf(stderr, "[error] Error opening output trace\n");
1458                 goto end_free;
1459         }
1460
1461         sout = container_of(td_write, struct ctf_text_stream_pos,
1462                         trace_descriptor);
1463         if (!sout->parent.event_cb) {
1464                 goto end_free;
1465         }
1466
1467         ret = lttng_live_create_viewer_session(ctx);
1468         if (ret < 0) {
1469                 goto end_free;
1470         }
1471
1472         for (i = 0; i < ctx->session_ids->len; i++) {
1473                 id = g_array_index(ctx->session_ids, uint64_t, i);
1474                 printf_verbose("Attaching to session %lu\n", id);
1475                 ret = lttng_live_attach_session(ctx, id);
1476                 printf_verbose("Attaching session returns %d\n", ret);
1477                 if (ret < 0) {
1478                         if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1479                                 fprintf(stderr, "[error] Unknown session ID\n");
1480                         }
1481                         goto end_free;
1482                 }
1483         }
1484
1485         /*
1486          * As long as the session is active, we try to get new streams.
1487          */
1488         for (;;) {
1489                 int flags;
1490
1491                 if (lttng_live_should_quit()) {
1492                         goto end_free;
1493                 }
1494
1495                 while (!ctx->session->stream_count) {
1496                         if (lttng_live_should_quit()
1497                                         || ctx->session_ids->len == 0) {
1498                                 goto end_free;
1499                         }
1500                         ret = ask_new_streams(ctx);
1501                         if (ret < 0) {
1502                                 goto end_free;
1503                         }
1504                         if (!ctx->session->stream_count) {
1505                                 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1506                         }
1507                 }
1508
1509                 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1510                                 ctx->bt_ctx);
1511
1512                 begin_pos.type = BT_SEEK_BEGIN;
1513                 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1514                 if (!iter) {
1515                         fprintf(stderr, "[error] Iterator creation error\n");
1516                         goto end;
1517                 }
1518                 for (;;) {
1519                         if (lttng_live_should_quit()) {
1520                                 goto end_free;
1521                         }
1522                         event = bt_ctf_iter_read_event_flags(iter, &flags);
1523                         if (!(flags & BT_ITER_FLAG_RETRY)) {
1524                                 if (!event) {
1525                                         /* End of trace */
1526                                         break;
1527                                 }
1528                                 ret = sout->parent.event_cb(&sout->parent,
1529                                                 event->parent->stream);
1530                                 if (ret) {
1531                                         fprintf(stderr, "[error] Writing "
1532                                                         "event failed.\n");
1533                                         goto end_free;
1534                                 }
1535                         }
1536                         ret = bt_iter_next(bt_ctf_get_iter(iter));
1537                         if (ret < 0) {
1538                                 goto end_free;
1539                         }
1540                 }
1541                 bt_ctf_iter_destroy(iter);
1542                 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1543                                 del_traces, ctx->bt_ctx);
1544                 ctx->session->stream_count = 0;
1545         }
1546
1547 end_free:
1548         bt_context_put(ctx->bt_ctx);
1549 end:
1550         return;
1551 }