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
 205         if (LTTNG_LIVE_MAJOR != be32toh(connect.major)) {
 206                 fprintf(stderr, "[error] Incompatible lttng-relayd protocol\n");
 207                 goto error;
 208         }
 209         /* Use the smallest protocol version implemented. */
 210         if (LTTNG_LIVE_MINOR > be32toh(connect.minor)) {
 211                 ctx->minor =  be32toh(connect.minor);
 212         } else {
 213                 ctx->minor =  LTTNG_LIVE_MINOR;
 214         }
 215         ctx->major = LTTNG_LIVE_MAJOR;
 216         ret = 0;
 217 end:
 218         return ret;
 219
 220 error:
 221         fprintf(stderr, "[error] Unable to establish connection\n");
 222         return -1;
 223 }
 224
 225 static
 226 void free_session_list(GPtrArray *session_list)
 227 {
 228         int i;
 229         struct lttng_live_relay_session *relay_session;
 230
 231         for (i = 0; i < session_list->len; i++) {
 232                 relay_session = g_ptr_array_index(session_list, i);
 233                 free(relay_session->name);
 234                 free(relay_session->hostname);
 235         }
 236         g_ptr_array_free(session_list, TRUE);
 237 }
 238
 239 static
 240 void print_session_list(GPtrArray *session_list, const char *path)
 241 {
 242         int i;
 243         struct lttng_live_relay_session *relay_session;
 244
 245         for (i = 0; i < session_list->len; i++) {
 246                 relay_session = g_ptr_array_index(session_list, i);
 247                 fprintf(stdout, "%s/host/%s/%s (timer = %u, "
 248                                 "%u stream(s), %u client(s) connected)\n",
 249                                 path, relay_session->hostname,
 250                                 relay_session->name, relay_session->timer,
 251                                 relay_session->streams, relay_session->clients);
 252         }
 253 }
 254
 255 static
 256 void update_session_list(GPtrArray *session_list, char *hostname,
 257                 char *session_name, uint32_t streams, uint32_t clients,
 258                 uint32_t timer)
 259 {
 260         int i, found = 0;
 261         struct lttng_live_relay_session *relay_session;
 262
 263         for (i = 0; i < session_list->len; i++) {
 264                 relay_session = g_ptr_array_index(session_list, i);
 265                 if ((strncmp(relay_session->hostname, hostname, NAME_MAX) == 0) &&
 266                                 strncmp(relay_session->name,
 267                                         session_name, NAME_MAX) == 0) {
 268                         relay_session->streams += streams;
 269                         if (relay_session->clients < clients)
 270                                 relay_session->clients = clients;
 271                         found = 1;
 272                         break;
 273                 }
 274         }
 275         if (found)
 276                 return;
 277
 278         relay_session = g_new0(struct lttng_live_relay_session, 1);
 279         relay_session->hostname = strndup(hostname, NAME_MAX);
 280         relay_session->name = strndup(session_name, NAME_MAX);
 281         relay_session->clients = clients;
 282         relay_session->streams = streams;
 283         relay_session->timer = timer;
 284         g_ptr_array_add(session_list, relay_session);
 285 }
 286
 287 int lttng_live_list_sessions(struct lttng_live_ctx *ctx, const char *path)
 288 {
 289         struct lttng_viewer_cmd cmd;
 290         struct lttng_viewer_list_sessions list;
 291         struct lttng_viewer_session lsession;
 292         int i, ret, sessions_count, print_list = 0;
 293         ssize_t ret_len;
 294         uint64_t session_id;
 295         GPtrArray *session_list = NULL;
 296
 297         if (lttng_live_should_quit()) {
 298                 ret = -1;
 299                 goto end;
 300         }
 301
 302         if (strlen(ctx->session_name) == 0) {
 303                 print_list = 1;
 304                 session_list = g_ptr_array_new();
 305         }
 306
 307         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 308         cmd.data_size = 0;
 309         cmd.cmd_version = 0;
 310
 311         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 312         if (ret_len < 0) {
 313                 perror("[error] Error sending cmd");
 314                 goto error;
 315         }
 316         assert(ret_len == sizeof(cmd));
 317
 318         ret_len = lttng_live_recv(ctx->control_sock, &list, sizeof(list));
 319         if (ret_len == 0) {
 320                 fprintf(stderr, "[error] Remote side has closed connection\n");
 321                 goto error;
 322         }
 323         if (ret_len < 0) {
 324                 perror("[error] Error receiving session list");
 325                 goto error;
 326         }
 327         assert(ret_len == sizeof(list));
 328
 329         sessions_count = be32toh(list.sessions_count);
 330         for (i = 0; i < sessions_count; i++) {
 331                 ret_len = lttng_live_recv(ctx->control_sock, &lsession, sizeof(lsession));
 332                 if (ret_len == 0) {
 333                         fprintf(stderr, "[error] Remote side has closed connection\n");
 334                         goto error;
 335                 }
 336                 if (ret_len < 0) {
 337                         perror("[error] Error receiving session");
 338                         goto error;
 339                 }
 340                 assert(ret_len == sizeof(lsession));
 341                 lsession.hostname[LTTNG_VIEWER_HOST_NAME_MAX - 1] = '\0';
 342                 lsession.session_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 343                 session_id = be64toh(lsession.id);
 344
 345                 if (print_list) {
 346                         update_session_list(session_list,
 347                                         lsession.hostname,
 348                                         lsession.session_name,
 349                                         be32toh(lsession.streams),
 350                                         be32toh(lsession.clients),
 351                                         be32toh(lsession.live_timer));
 352                 } else {
 353                         if ((strncmp(lsession.session_name, ctx->session_name,
 354                                 NAME_MAX) == 0) && (strncmp(lsession.hostname,
 355                                         ctx->traced_hostname, NAME_MAX) == 0)) {
 356                                 printf_verbose("Reading from session %" PRIu64 "\n",
 357                                                 session_id);
 358                                 g_array_append_val(ctx->session_ids,
 359                                                 session_id);
 360                         }
 361                 }
 362         }
 363
 364         if (print_list) {
 365                 print_session_list(session_list, path);
 366                 free_session_list(session_list);
 367         }
 368         ret = 0;
 369 end:
 370         return ret;
 371
 372 error:
 373         fprintf(stderr, "[error] Unable to list sessions\n");
 374         return -1;
 375 }
 376
 377 int lttng_live_ctf_trace_assign(struct lttng_live_viewer_stream *stream,
 378                 uint64_t ctf_trace_id)
 379 {
 380         struct lttng_live_ctf_trace *trace;
 381         int ret = 0;
 382
 383         trace = g_hash_table_lookup(stream->session->ctf_traces,
 384                         (gpointer) ctf_trace_id);
 385         if (!trace) {
 386                 trace = g_new0(struct lttng_live_ctf_trace, 1);
 387                 trace->ctf_trace_id = ctf_trace_id;
 388                 trace->streams = g_ptr_array_new();
 389                 g_hash_table_insert(stream->session->ctf_traces,
 390                                 (gpointer) ctf_trace_id,
 391                                 trace);
 392         }
 393         if (stream->metadata_flag)
 394                 trace->metadata_stream = stream;
 395
 396         stream->ctf_trace = trace;
 397         g_ptr_array_add(trace->streams, stream);
 398
 399         return ret;
 400 }
 401
 402 static
 403 int open_metadata_fp_write(struct lttng_live_viewer_stream *stream,
 404                 char **metadata_buf, size_t *size)
 405 {
 406         int ret = 0;
 407
 408         stream->metadata_fp_write =
 409                 babeltrace_open_memstream(metadata_buf, size);
 410         if (!stream->metadata_fp_write) {
 411                 perror("Metadata open_memstream");
 412                 ret = -1;
 413         }
 414
 415         return ret;
 416 }
 417
 418 int lttng_live_attach_session(struct lttng_live_ctx *ctx, uint64_t id)
 419 {
 420         struct lttng_viewer_cmd cmd;
 421         struct lttng_viewer_attach_session_request rq;
 422         struct lttng_viewer_attach_session_response rp;
 423         struct lttng_viewer_stream stream;
 424         int ret, i;
 425         ssize_t ret_len;
 426
 427         if (lttng_live_should_quit()) {
 428                 ret = -1;
 429                 goto end;
 430         }
 431
 432         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 433         cmd.data_size = sizeof(rq);
 434         cmd.cmd_version = 0;
 435
 436         memset(&rq, 0, sizeof(rq));
 437         rq.session_id = htobe64(id);
 438         // TODO: add cmd line parameter to select seek beginning
 439         // rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 440         rq.seek = htobe32(LTTNG_VIEWER_SEEK_LAST);
 441
 442         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 443         if (ret_len < 0) {
 444                 perror("[error] Error sending cmd");
 445                 goto error;
 446         }
 447         assert(ret_len == sizeof(cmd));
 448
 449         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 450         if (ret_len < 0) {
 451                 perror("[error] Error sending attach request");
 452                 goto error;
 453         }
 454         assert(ret_len == sizeof(rq));
 455
 456         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 457         if (ret_len == 0) {
 458                 fprintf(stderr, "[error] Remote side has closed connection\n");
 459                 goto error;
 460         }
 461         if (ret_len < 0) {
 462                 perror("[error] Error receiving attach response");
 463                 goto error;
 464         }
 465         assert(ret_len == sizeof(rp));
 466
 467         switch(be32toh(rp.status)) {
 468         case LTTNG_VIEWER_ATTACH_OK:
 469                 break;
 470         case LTTNG_VIEWER_ATTACH_UNK:
 471                 ret = -LTTNG_VIEWER_ATTACH_UNK;
 472                 goto end;
 473         case LTTNG_VIEWER_ATTACH_ALREADY:
 474                 fprintf(stderr, "[error] There is already a viewer attached to this session\n");
 475                 goto error;
 476         case LTTNG_VIEWER_ATTACH_NOT_LIVE:
 477                 fprintf(stderr, "[error] Not a live session\n");
 478                 goto error;
 479         case LTTNG_VIEWER_ATTACH_SEEK_ERR:
 480                 fprintf(stderr, "[error] Wrong seek parameter\n");
 481                 goto error;
 482         default:
 483                 fprintf(stderr, "[error] Unknown attach return code %u\n",
 484                                 be32toh(rp.status));
 485                 goto error;
 486         }
 487         if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
 488                 goto error;
 489         }
 490
 491         ctx->session->stream_count += be32toh(rp.streams_count);
 492         /*
 493          * When the session is created but not started, we do an active wait
 494          * until it starts. It allows the viewer to start processing the trace
 495          * as soon as the session starts.
 496          */
 497         if (ctx->session->stream_count == 0) {
 498                 ret = 0;
 499                 goto end;
 500         }
 501         printf_verbose("Waiting for %" PRIu64 " streams:\n",
 502                 ctx->session->stream_count);
 503         ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
 504                         ctx->session->stream_count);
 505         for (i = 0; i < be32toh(rp.streams_count); i++) {
 506                 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
 507                 if (ret_len == 0) {
 508                         fprintf(stderr, "[error] Remote side has closed connection\n");
 509                         goto error;
 510                 }
 511                 if (ret_len < 0) {
 512                         perror("[error] Error receiving stream");
 513                         goto error;
 514                 }
 515                 assert(ret_len == sizeof(stream));
 516                 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
 517                 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
 518
 519                 printf_verbose("    stream %" PRIu64 " : %s/%s\n",
 520                                 be64toh(stream.id), stream.path_name,
 521                                 stream.channel_name);
 522                 ctx->session->streams[i].id = be64toh(stream.id);
 523                 ctx->session->streams[i].session = ctx->session;
 524
 525                 ctx->session->streams[i].first_read = 1;
 526                 ctx->session->streams[i].mmap_size = 0;
 527
 528                 if (be32toh(stream.metadata_flag)) {
 529                         ctx->session->streams[i].metadata_flag = 1;
 530                 }
 531                 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
 532                                 be64toh(stream.ctf_trace_id));
 533                 if (ret < 0) {
 534                         goto error;
 535                 }
 536
 537         }
 538         ret = 0;
 539 end:
 540         return ret;
 541
 542 error:
 543         return -1;
 544 }
 545
 546 /*
 547  * Ask the relay for new streams.
 548  *
 549  * Returns the number of new streams received or a negative value on error.
 550  */
 551 static
 552 int ask_new_streams(struct lttng_live_ctx *ctx)
 553 {
 554         int i, ret = 0, nb_streams = 0;
 555         uint64_t id;
 556
 557 restart:
 558         for (i = 0; i < ctx->session_ids->len; i++) {
 559                 id = g_array_index(ctx->session_ids, uint64_t, i);
 560                 ret = lttng_live_get_new_streams(ctx, id);
 561                 printf_verbose("Asking for new streams returns %d\n", ret);
 562                 if (ret < 0) {
 563                         if (lttng_live_should_quit()) {
 564                                 goto end;
 565                         }
 566                         if (ret == -LTTNG_VIEWER_NEW_STREAMS_HUP) {
 567                                 printf_verbose("Session %" PRIu64 " closed\n",
 568                                                 id);
 569                                 /*
 570                                  * The streams have already been closed during
 571                                  * the reading, so we only need to get rid of
 572                                  * the trace in our internal table of sessions.
 573                                  */
 574                                 g_array_remove_index(ctx->session_ids, i);
 575                                 /*
 576                                  * We can't continue iterating on the g_array
 577                                  * after a remove, we have to start again.
 578                                  */
 579                                 goto restart;
 580                         } else {
 581                                 ret = -1;
 582                                 goto end;
 583                         }
 584                 } else {
 585                         nb_streams += ret;
 586                 }
 587         }
 588         ret = nb_streams;
 589
 590 end:
 591         return ret;
 592 }
 593
 594 static
 595 int append_metadata(struct lttng_live_ctx *ctx,
 596                 struct lttng_live_viewer_stream *viewer_stream)
 597 {
 598         int ret;
 599         struct lttng_live_viewer_stream *metadata;
 600         char *metadata_buf = NULL;
 601
 602         printf_verbose("get_next_index: new metadata needed\n");
 603         ret = get_new_metadata(ctx, viewer_stream, &metadata_buf);
 604         if (ret < 0) {
 605                 free(metadata_buf);
 606                 goto error;
 607         }
 608
 609         metadata = viewer_stream->ctf_trace->metadata_stream;
 610         metadata->ctf_trace->metadata_fp =
 611                 babeltrace_fmemopen(metadata_buf,
 612                                 metadata->metadata_len, "rb");
 613         if (!metadata->ctf_trace->metadata_fp) {
 614                 perror("Metadata fmemopen");
 615                 free(metadata_buf);
 616                 ret = -1;
 617                 goto error;
 618         }
 619         ret = ctf_append_trace_metadata(
 620                         viewer_stream->ctf_trace->handle->td,
 621                         metadata->ctf_trace->metadata_fp);
 622         /* We accept empty metadata packets */
 623         if (ret != 0 && ret != -ENOENT) {
 624                 fprintf(stderr, "[error] Appending metadata\n");
 625                 goto error;
 626         }
 627         ret = 0;
 628
 629 error:
 630         return ret;
 631 }
 632
 633 static
 634 int get_data_packet(struct lttng_live_ctx *ctx,
 635                 struct ctf_stream_pos *pos,
 636                 struct lttng_live_viewer_stream *stream, uint64_t offset,
 637                 uint64_t len)
 638 {
 639         struct lttng_viewer_cmd cmd;
 640         struct lttng_viewer_get_packet rq;
 641         struct lttng_viewer_trace_packet rp;
 642         ssize_t ret_len;
 643         int ret;
 644
 645 retry:
 646         if (lttng_live_should_quit()) {
 647                 ret = -1;
 648                 goto end;
 649         }
 650         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
 651         cmd.data_size = sizeof(rq);
 652         cmd.cmd_version = 0;
 653
 654         memset(&rq, 0, sizeof(rq));
 655         rq.stream_id = htobe64(stream->id);
 656         rq.offset = htobe64(offset);
 657         rq.len = htobe32(len);
 658
 659         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 660         if (ret_len < 0) {
 661                 perror("[error] Error sending cmd");
 662                 goto error;
 663         }
 664         assert(ret_len == sizeof(cmd));
 665
 666         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 667         if (ret_len < 0) {
 668                 perror("[error] Error sending get_data_packet request");
 669                 goto error;
 670         }
 671         assert(ret_len == sizeof(rq));
 672
 673         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 674         if (ret_len == 0) {
 675                 fprintf(stderr, "[error] Remote side has closed connection\n");
 676                 goto error;
 677         }
 678         if (ret_len < 0) {
 679                 perror("[error] Error receiving data response");
 680                 goto error;
 681         }
 682         if (ret_len != sizeof(rp)) {
 683                 fprintf(stderr, "[error] get_data_packet: expected %" PRId64
 684                                 ", received %" PRId64 "\n", sizeof(rp),
 685                                 ret_len);
 686                 goto error;
 687         }
 688
 689         rp.flags = be32toh(rp.flags);
 690
 691         switch (be32toh(rp.status)) {
 692         case LTTNG_VIEWER_GET_PACKET_OK:
 693                 len = be32toh(rp.len);
 694                 printf_verbose("get_data_packet: Ok, packet size : %" PRIu64
 695                                 "\n", len);
 696                 break;
 697         case LTTNG_VIEWER_GET_PACKET_RETRY:
 698                 /* Unimplemented by relay daemon */
 699                 printf_verbose("get_data_packet: retry\n");
 700                 goto error;
 701         case LTTNG_VIEWER_GET_PACKET_ERR:
 702                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 703                         printf_verbose("get_data_packet: new metadata needed\n");
 704                         ret = append_metadata(ctx, stream);
 705                         if (ret)
 706                                 goto error;
 707                 }
 708                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
 709                         printf_verbose("get_data_packet: new streams needed\n");
 710                         ret = ask_new_streams(ctx);
 711                         if (ret < 0)
 712                                 goto error;
 713                         else if (ret > 0)
 714                                 g_hash_table_foreach(ctx->session->ctf_traces,
 715                                                 add_traces, ctx->bt_ctx);
 716                 }
 717                 if (rp.flags & (LTTNG_VIEWER_FLAG_NEW_METADATA
 718                                 | LTTNG_VIEWER_FLAG_NEW_STREAM)) {
 719                         goto retry;
 720                 }
 721                 fprintf(stderr, "[error] get_data_packet: error\n");
 722                 goto error;
 723         case LTTNG_VIEWER_GET_PACKET_EOF:
 724                 ret = -2;
 725                 goto end;
 726         default:
 727                 printf_verbose("get_data_packet: unknown\n");
 728                 goto error;
 729         }
 730
 731         if (len == 0) {
 732                 goto error;
 733         }
 734
 735         if (len > stream->mmap_size) {
 736                 uint64_t new_size;
 737
 738                 new_size = max_t(uint64_t, len, stream->mmap_size << 1);
 739                 if (pos->base_mma) {
 740                         /* unmap old base */
 741                         ret = munmap_align(pos->base_mma);
 742                         if (ret) {
 743                                 perror("[error] Unable to unmap old base");
 744                                 goto error;
 745                         }
 746                         pos->base_mma = NULL;
 747                 }
 748                 pos->base_mma = mmap_align(new_size,
 749                                 PROT_READ | PROT_WRITE,
 750                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 751                 if (pos->base_mma == MAP_FAILED) {
 752                         perror("[error] mmap error");
 753                         pos->base_mma = NULL;
 754                         goto error;
 755                 }
 756
 757                 stream->mmap_size = new_size;
 758                 printf_verbose("Expanding stream mmap size to %" PRIu64 " bytes\n",
 759                                 stream->mmap_size);
 760         }
 761
 762         ret_len = lttng_live_recv(ctx->control_sock,
 763                         mmap_align_addr(pos->base_mma), len);
 764         if (ret_len == 0) {
 765                 fprintf(stderr, "[error] Remote side has closed connection\n");
 766                 goto error;
 767         }
 768         if (ret_len < 0) {
 769                 perror("[error] Error receiving trace packet");
 770                 goto error;
 771         }
 772         assert(ret_len == len);
 773         ret = 0;
 774 end:
 775         return ret;
 776
 777 error:
 778         return -1;
 779 }
 780
 781 static
 782 int get_one_metadata_packet(struct lttng_live_ctx *ctx,
 783                 struct lttng_live_viewer_stream *metadata_stream)
 784 {
 785         uint64_t len = 0;
 786         int ret;
 787         struct lttng_viewer_cmd cmd;
 788         struct lttng_viewer_get_metadata rq;
 789         struct lttng_viewer_metadata_packet rp;
 790         char *data = NULL;
 791         ssize_t ret_len;
 792
 793         if (lttng_live_should_quit()) {
 794                 ret = -1;
 795                 goto end;
 796         }
 797
 798         rq.stream_id = htobe64(metadata_stream->id);
 799         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 800         cmd.data_size = sizeof(rq);
 801         cmd.cmd_version = 0;
 802
 803         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 804         if (ret_len < 0) {
 805                 perror("[error] Error sending cmd");
 806                 goto error;
 807         }
 808         assert(ret_len == sizeof(cmd));
 809
 810         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 811         if (ret_len < 0) {
 812                 perror("[error] Error sending get_metadata request");
 813                 goto error;
 814         }
 815         assert(ret_len == sizeof(rq));
 816
 817         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 818         if (ret_len == 0) {
 819                 fprintf(stderr, "[error] Remote side has closed connection\n");
 820                 goto error;
 821         }
 822         if (ret_len < 0) {
 823                 perror("[error] Error receiving metadata response");
 824                 goto error;
 825         }
 826         assert(ret_len == sizeof(rp));
 827
 828         switch (be32toh(rp.status)) {
 829                 case LTTNG_VIEWER_METADATA_OK:
 830                         printf_verbose("get_metadata : OK\n");
 831                         break;
 832                 case LTTNG_VIEWER_NO_NEW_METADATA:
 833                         printf_verbose("get_metadata : NO NEW\n");
 834                         ret = 0;
 835                         goto end;
 836                 case LTTNG_VIEWER_METADATA_ERR:
 837                         printf_verbose("get_metadata : ERR\n");
 838                         goto error;
 839                 default:
 840                         printf_verbose("get_metadata : UNKNOWN\n");
 841                         goto error;
 842         }
 843
 844         len = be64toh(rp.len);
 845         printf_verbose("Writing %" PRIu64" bytes to metadata\n", len);
 846         if (len <= 0) {
 847                 goto error;
 848         }
 849
 850         data = zmalloc(len);
 851         if (!data) {
 852                 perror("relay data zmalloc");
 853                 goto error;
 854         }
 855         ret_len = lttng_live_recv(ctx->control_sock, data, len);
 856         if (ret_len == 0) {
 857                 fprintf(stderr, "[error] Remote side has closed connection\n");
 858                 goto error_free_data;
 859         }
 860         if (ret_len < 0) {
 861                 perror("[error] Error receiving trace packet");
 862                 goto error_free_data;
 863         }
 864         assert(ret_len == len);
 865
 866         do {
 867                 ret_len = fwrite(data, 1, len,
 868                                 metadata_stream->metadata_fp_write);
 869         } while (ret_len < 0 && errno == EINTR);
 870         if (ret_len < 0) {
 871                 fprintf(stderr, "[error] Writing in the metadata fp\n");
 872                 goto error_free_data;
 873         }
 874         assert(ret_len == len);
 875         metadata_stream->metadata_len += len;
 876         free(data);
 877         ret = len;
 878 end:
 879         return ret;
 880
 881 error_free_data:
 882         free(data);
 883 error:
 884         return -1;
 885 }
 886
 887 /*
 888  * Return 0 on success, a negative value on error.
 889  */
 890 static
 891 int get_new_metadata(struct lttng_live_ctx *ctx,
 892                 struct lttng_live_viewer_stream *viewer_stream,
 893                 char **metadata_buf)
 894 {
 895         int ret = 0;
 896         struct lttng_live_viewer_stream *metadata_stream;
 897         size_t size, len_read = 0;
 898
 899         metadata_stream = viewer_stream->ctf_trace->metadata_stream;
 900         if (!metadata_stream) {
 901                 fprintf(stderr, "[error] No metadata stream\n");
 902                 ret = -1;
 903                 goto error;
 904         }
 905         metadata_stream->metadata_len = 0;
 906         ret = open_metadata_fp_write(metadata_stream, metadata_buf, &size);
 907         if (ret < 0) {
 908                 goto error;
 909         }
 910
 911         do {
 912                 /*
 913                  * get_one_metadata_packet returns the number of bytes
 914                  * received, 0 when we have received everything, a
 915                  * negative value on error.
 916                  */
 917                 ret = get_one_metadata_packet(ctx, metadata_stream);
 918                 if (ret > 0) {
 919                         len_read += ret;
 920                 }
 921                 if (!len_read) {
 922                         (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
 923                 }
 924         } while (ret > 0 || !len_read);
 925
 926         if (fclose(metadata_stream->metadata_fp_write))
 927                 perror("fclose");
 928         metadata_stream->metadata_fp_write = NULL;
 929
 930 error:
 931         return ret;
 932 }
 933
 934 /*
 935  * Get one index for a stream.
 936  *
 937  * Returns 0 on success or a negative value on error.
 938  */
 939 static
 940 int get_next_index(struct lttng_live_ctx *ctx,
 941                 struct lttng_live_viewer_stream *viewer_stream,
 942                 struct packet_index *index)
 943 {
 944         struct lttng_viewer_cmd cmd;
 945         struct lttng_viewer_get_next_index rq;
 946         struct lttng_viewer_index rp;
 947         int ret;
 948         ssize_t ret_len;
 949
 950         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
 951         cmd.data_size = sizeof(rq);
 952         cmd.cmd_version = 0;
 953
 954         memset(&rq, 0, sizeof(rq));
 955         rq.stream_id = htobe64(viewer_stream->id);
 956
 957 retry:
 958         if (lttng_live_should_quit()) {
 959                 ret = -1;
 960                 goto end;
 961         }
 962         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
 963         if (ret_len < 0) {
 964                 perror("[error] Error sending cmd");
 965                 goto error;
 966         }
 967         assert(ret_len == sizeof(cmd));
 968
 969         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
 970         if (ret_len < 0) {
 971                 perror("[error] Error sending get_next_index request");
 972                 goto error;
 973         }
 974         assert(ret_len == sizeof(rq));
 975
 976         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
 977         if (ret_len == 0) {
 978                 fprintf(stderr, "[error] Remote side has closed connection\n");
 979                 goto error;
 980         }
 981         if (ret_len < 0) {
 982                 perror("[error] Error receiving index response");
 983                 goto error;
 984         }
 985         assert(ret_len == sizeof(rp));
 986
 987         rp.flags = be32toh(rp.flags);
 988
 989         switch (be32toh(rp.status)) {
 990         case LTTNG_VIEWER_INDEX_INACTIVE:
 991                 printf_verbose("get_next_index: inactive\n");
 992                 memset(index, 0, sizeof(struct packet_index));
 993                 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
 994                 break;
 995         case LTTNG_VIEWER_INDEX_OK:
 996                 printf_verbose("get_next_index: Ok, need metadata update : %u\n",
 997                                 rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA);
 998                 index->offset = be64toh(rp.offset);
 999                 index->packet_size = be64toh(rp.packet_size);
1000                 index->content_size = be64toh(rp.content_size);
1001                 index->ts_cycles.timestamp_begin = be64toh(rp.timestamp_begin);
1002                 index->ts_cycles.timestamp_end = be64toh(rp.timestamp_end);
1003                 index->events_discarded = be64toh(rp.events_discarded);
1004
1005                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
1006                         ret = append_metadata(ctx, viewer_stream);
1007                         if (ret)
1008                                 goto error;
1009                 }
1010                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_STREAM) {
1011                         printf_verbose("get_next_index: need new streams\n");
1012                         ret = ask_new_streams(ctx);
1013                         if (ret < 0)
1014                                 goto error;
1015                         else if (ret > 0)
1016                                 g_hash_table_foreach(ctx->session->ctf_traces,
1017                                                 add_traces, ctx->bt_ctx);
1018                 }
1019                 break;
1020         case LTTNG_VIEWER_INDEX_RETRY:
1021                 printf_verbose("get_next_index: retry\n");
1022                 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1023                 goto retry;
1024         case LTTNG_VIEWER_INDEX_HUP:
1025                 printf_verbose("get_next_index: stream hung up\n");
1026                 viewer_stream->id = -1ULL;
1027                 index->offset = EOF;
1028                 ctx->session->stream_count--;
1029                 break;
1030         case LTTNG_VIEWER_INDEX_ERR:
1031                 fprintf(stderr, "[error] get_next_index: error\n");
1032                 goto error;
1033         default:
1034                 fprintf(stderr, "[error] get_next_index: unkwown value\n");
1035                 goto error;
1036         }
1037         ret = 0;
1038 end:
1039         return ret;
1040
1041 error:
1042         return -1;
1043 }
1044
1045 static
1046 void ctf_live_packet_seek(struct bt_stream_pos *stream_pos, size_t index,
1047                 int whence)
1048 {
1049         struct ctf_stream_pos *pos;
1050         struct ctf_file_stream *file_stream;
1051         struct packet_index *prev_index = NULL, *cur_index;
1052         struct lttng_live_viewer_stream *viewer_stream;
1053         struct lttng_live_session *session;
1054         int ret;
1055
1056 retry:
1057         pos = ctf_pos(stream_pos);
1058         file_stream = container_of(pos, struct ctf_file_stream, pos);
1059         viewer_stream = (struct lttng_live_viewer_stream *) pos->priv;
1060         session = viewer_stream->session;
1061
1062         switch (pos->packet_index->len) {
1063         case 0:
1064                 g_array_set_size(pos->packet_index, 1);
1065                 cur_index = &g_array_index(pos->packet_index,
1066                                 struct packet_index, 0);
1067                 break;
1068         case 1:
1069                 g_array_set_size(pos->packet_index, 2);
1070                 prev_index = &g_array_index(pos->packet_index,
1071                                 struct packet_index, 0);
1072                 cur_index = &g_array_index(pos->packet_index,
1073                                 struct packet_index, 1);
1074                 break;
1075         case 2:
1076                 g_array_index(pos->packet_index,
1077                         struct packet_index, 0) =
1078                                 g_array_index(pos->packet_index,
1079                                         struct packet_index, 1);
1080                 prev_index = &g_array_index(pos->packet_index,
1081                                 struct packet_index, 0);
1082                 cur_index = &g_array_index(pos->packet_index,
1083                                 struct packet_index, 1);
1084                 break;
1085         default:
1086                 abort();
1087                 break;
1088         }
1089         printf_verbose("get_next_index for stream %" PRIu64 "\n", viewer_stream->id);
1090         ret = get_next_index(session->ctx, viewer_stream, cur_index);
1091         if (ret < 0) {
1092                 pos->offset = EOF;
1093                 if (!lttng_live_should_quit()) {
1094                         fprintf(stderr, "[error] get_next_index failed\n");
1095                 }
1096                 return;
1097         }
1098
1099         pos->packet_size = cur_index->packet_size;
1100         pos->content_size = cur_index->content_size;
1101         pos->mmap_base_offset = 0;
1102         if (cur_index->offset == EOF) {
1103                 pos->offset = EOF;
1104         } else {
1105                 pos->offset = 0;
1106         }
1107
1108         if (cur_index->content_size == 0) {
1109                 file_stream->parent.cycles_timestamp =
1110                                 cur_index->ts_cycles.timestamp_end;
1111                 file_stream->parent.real_timestamp = ctf_get_real_timestamp(
1112                                 &file_stream->parent,
1113                                 cur_index->ts_cycles.timestamp_end);
1114         } else {
1115                 /* Convert the timestamps and append to the real_index. */
1116                 cur_index->ts_real.timestamp_begin = ctf_get_real_timestamp(
1117                                 &file_stream->parent,
1118                                 cur_index->ts_cycles.timestamp_begin);
1119                 cur_index->ts_real.timestamp_end = ctf_get_real_timestamp(
1120                                 &file_stream->parent,
1121                                 cur_index->ts_cycles.timestamp_end);
1122
1123                 ctf_update_current_packet_index(&file_stream->parent,
1124                                 prev_index, cur_index);
1125
1126                 file_stream->parent.cycles_timestamp =
1127                                 cur_index->ts_cycles.timestamp_begin;
1128                 file_stream->parent.real_timestamp =
1129                                 cur_index->ts_real.timestamp_begin;
1130         }
1131
1132         if (pos->packet_size == 0 || pos->offset == EOF) {
1133                 goto end;
1134         }
1135
1136         printf_verbose("get_data_packet for stream %" PRIu64 "\n",
1137                         viewer_stream->id);
1138         ret = get_data_packet(session->ctx, pos, viewer_stream,
1139                         cur_index->offset,
1140                         cur_index->packet_size / CHAR_BIT);
1141         if (ret == -2) {
1142                 goto retry;
1143         } else if (ret < 0) {
1144                 pos->offset = EOF;
1145                 if (!lttng_live_should_quit()) {
1146                         fprintf(stderr, "[error] get_data_packet failed\n");
1147                 }
1148                 return;
1149         }
1150
1151         printf_verbose("Index received : packet_size : %" PRIu64
1152                         ", offset %" PRIu64 ", content_size %" PRIu64
1153                         ", timestamp_end : %" PRIu64 "\n",
1154                         cur_index->packet_size, cur_index->offset,
1155                         cur_index->content_size,
1156                         cur_index->ts_cycles.timestamp_end);
1157
1158         /* update trace_packet_header and stream_packet_context */
1159         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
1160                 /* Read packet header */
1161                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1162                 if (ret) {
1163                         pos->offset = EOF;
1164                         fprintf(stderr, "[error] trace packet header read failed\n");
1165                         goto end;
1166                 }
1167         }
1168         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
1169                 /* Read packet context */
1170                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1171                 if (ret) {
1172                         pos->offset = EOF;
1173                         fprintf(stderr, "[error] stream packet context read failed\n");
1174                         goto end;
1175                 }
1176         }
1177         pos->data_offset = pos->offset;
1178
1179 end:
1180         return;
1181 }
1182
1183 int lttng_live_create_viewer_session(struct lttng_live_ctx *ctx)
1184 {
1185         struct lttng_viewer_cmd cmd;
1186         struct lttng_viewer_create_session_response resp;
1187         int ret;
1188         ssize_t ret_len;
1189
1190         if (lttng_live_should_quit()) {
1191                 ret = -1;
1192                 goto end;
1193         }
1194
1195         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
1196         cmd.data_size = 0;
1197         cmd.cmd_version = 0;
1198
1199         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1200         if (ret_len < 0) {
1201                 perror("[error] Error sending cmd");
1202                 goto error;
1203         }
1204         assert(ret_len == sizeof(cmd));
1205
1206         ret_len = lttng_live_recv(ctx->control_sock, &resp, sizeof(resp));
1207         if (ret_len == 0) {
1208                 fprintf(stderr, "[error] Remote side has closed connection\n");
1209                 goto error;
1210         }
1211         if (ret_len < 0) {
1212                 perror("[error] Error receiving create session reply");
1213                 goto error;
1214         }
1215         assert(ret_len == sizeof(resp));
1216
1217         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
1218                 fprintf(stderr, "[error] Error creating viewer session\n");
1219                 goto error;
1220         }
1221         ret = 0;
1222 end:
1223         return ret;
1224
1225 error:
1226         return -1;
1227 }
1228
1229 static
1230 int del_traces(gpointer key, gpointer value, gpointer user_data)
1231 {
1232         struct bt_context *bt_ctx = user_data;
1233         struct lttng_live_ctf_trace *trace = value;
1234         int ret;
1235
1236         ret = bt_context_remove_trace(bt_ctx, trace->trace_id);
1237         if (ret < 0)
1238                 fprintf(stderr, "[error] removing trace from context\n");
1239
1240         /* remove the key/value pair from the HT. */
1241         return 1;
1242 }
1243
1244 static
1245 void add_traces(gpointer key, gpointer value, gpointer user_data)
1246 {
1247         int i, ret;
1248         struct bt_context *bt_ctx = user_data;
1249         struct lttng_live_ctf_trace *trace = value;
1250         struct lttng_live_viewer_stream *stream;
1251         struct bt_mmap_stream *new_mmap_stream;
1252         struct bt_mmap_stream_list mmap_list;
1253         struct lttng_live_ctx *ctx = NULL;
1254         struct bt_trace_descriptor *td;
1255         struct bt_trace_handle *handle;
1256
1257         /*
1258          * We don't know how many streams we will receive for a trace, so
1259          * once we are done receiving the traces, we add all the traces
1260          * received to the bt_context.
1261          * We can receive streams during the attach command or the
1262          * get_new_streams, so we have to make sure not to add multiple
1263          * times the same traces.
1264          * If a trace is already in the context, we just skip this function.
1265          */
1266         if (trace->in_use)
1267                 return;
1268
1269         BT_INIT_LIST_HEAD(&mmap_list.head);
1270
1271         for (i = 0; i < trace->streams->len; i++) {
1272                 stream = g_ptr_array_index(trace->streams, i);
1273                 ctx = stream->session->ctx;
1274
1275                 if (!stream->metadata_flag) {
1276                         new_mmap_stream = zmalloc(sizeof(struct bt_mmap_stream));
1277                         new_mmap_stream->priv = (void *) stream;
1278                         new_mmap_stream->fd = -1;
1279                         bt_list_add(&new_mmap_stream->list, &mmap_list.head);
1280                 } else {
1281                         char *metadata_buf = NULL;
1282
1283                         /* Get all possible metadata before starting */
1284                         ret = get_new_metadata(ctx, stream, &metadata_buf);
1285                         if (ret) {
1286                                 free(metadata_buf);
1287                                 goto end_free;
1288                         }
1289                         if (!stream->metadata_len) {
1290                                 fprintf(stderr, "[error] empty metadata\n");
1291                                 ret = -1;
1292                                 free(metadata_buf);
1293                                 goto end_free;
1294                         }
1295
1296                         trace->metadata_fp = babeltrace_fmemopen(metadata_buf,
1297                                         stream->metadata_len, "rb");
1298                         if (!trace->metadata_fp) {
1299                                 perror("Metadata fmemopen");
1300                                 ret = -1;
1301                                 free(metadata_buf);
1302                                 goto end_free;
1303                         }
1304                 }
1305         }
1306
1307         if (!trace->metadata_fp) {
1308                 fprintf(stderr, "[error] No metadata stream opened\n");
1309                 goto end_free;
1310         }
1311
1312         ret = bt_context_add_trace(bt_ctx, NULL, "ctf",
1313                         ctf_live_packet_seek, &mmap_list, trace->metadata_fp);
1314         if (ret < 0) {
1315                 fprintf(stderr, "[error] Error adding trace\n");
1316                 goto end_free;
1317         }
1318         trace->metadata_stream->metadata_len = 0;
1319
1320         handle = (struct bt_trace_handle *) g_hash_table_lookup(
1321                         bt_ctx->trace_handles,
1322                         (gpointer) (unsigned long) ret);
1323         td = handle->td;
1324         trace->handle = handle;
1325         if (bt_ctx->current_iterator) {
1326                 bt_iter_add_trace(bt_ctx->current_iterator, td);
1327         }
1328
1329         trace->trace_id = ret;
1330         trace->in_use = 1;
1331
1332         goto end;
1333
1334 end_free:
1335         bt_context_put(bt_ctx);
1336 end:
1337         return;
1338 }
1339
1340 /*
1341  * Request new streams for a session.
1342  * Returns the number of streams received or a negative value on error.
1343  */
1344 int lttng_live_get_new_streams(struct lttng_live_ctx *ctx, uint64_t id)
1345 {
1346         struct lttng_viewer_cmd cmd;
1347         struct lttng_viewer_new_streams_request rq;
1348         struct lttng_viewer_new_streams_response rp;
1349         struct lttng_viewer_stream stream;
1350         int ret, i, nb_streams = 0;
1351         ssize_t ret_len;
1352         uint32_t stream_count;
1353
1354         if (lttng_live_should_quit()) {
1355                 ret = -1;
1356                 goto end;
1357         }
1358
1359         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEW_STREAMS);
1360         cmd.data_size = sizeof(rq);
1361         cmd.cmd_version = 0;
1362
1363         memset(&rq, 0, sizeof(rq));
1364         rq.session_id = htobe64(id);
1365
1366         ret_len = lttng_live_send(ctx->control_sock, &cmd, sizeof(cmd));
1367         if (ret_len < 0) {
1368                 perror("[error] Error sending cmd");
1369                 goto error;
1370         }
1371         assert(ret_len == sizeof(cmd));
1372
1373         ret_len = lttng_live_send(ctx->control_sock, &rq, sizeof(rq));
1374         if (ret_len < 0) {
1375                 perror("[error] Error sending get_new_streams request");
1376                 goto error;
1377         }
1378         assert(ret_len == sizeof(rq));
1379
1380         ret_len = lttng_live_recv(ctx->control_sock, &rp, sizeof(rp));
1381         if (ret_len == 0) {
1382                 fprintf(stderr, "[error] Remote side has closed connection\n");
1383                 goto error;
1384         }
1385         if (ret_len < 0) {
1386                 perror("[error] Error receiving get_new_streams response");
1387                 goto error;
1388         }
1389         assert(ret_len == sizeof(rp));
1390
1391         switch(be32toh(rp.status)) {
1392         case LTTNG_VIEWER_NEW_STREAMS_OK:
1393                 break;
1394         case LTTNG_VIEWER_NEW_STREAMS_NO_NEW:
1395                 ret = 0;
1396                 goto end;
1397         case LTTNG_VIEWER_NEW_STREAMS_HUP:
1398                 ret = -LTTNG_VIEWER_NEW_STREAMS_HUP;
1399                 goto end;
1400         case LTTNG_VIEWER_NEW_STREAMS_ERR:
1401                 fprintf(stderr, "[error] get_new_streams error\n");
1402                 goto error;
1403         default:
1404                 fprintf(stderr, "[error] Unknown return code %u\n",
1405                                 be32toh(rp.status));
1406                 goto error;
1407         }
1408
1409         stream_count = be32toh(rp.streams_count);
1410         ctx->session->stream_count += stream_count;
1411         /*
1412          * When the session is created but not started, we do an active wait
1413          * until it starts. It allows the viewer to start processing the trace
1414          * as soon as the session starts.
1415          */
1416         if (ctx->session->stream_count == 0) {
1417                 ret = 0;
1418                 goto end;
1419         }
1420         printf_verbose("Waiting for %" PRIu64 " streams:\n",
1421                 ctx->session->stream_count);
1422         ctx->session->streams = g_new0(struct lttng_live_viewer_stream,
1423                         ctx->session->stream_count);
1424         for (i = 0; i < stream_count; i++) {
1425                 ret_len = lttng_live_recv(ctx->control_sock, &stream, sizeof(stream));
1426                 if (ret_len == 0) {
1427                         fprintf(stderr, "[error] Remote side has closed connection\n");
1428                         goto error;
1429                 }
1430                 if (ret_len < 0) {
1431                         perror("[error] Error receiving stream");
1432                         goto error;
1433                 }
1434                 assert(ret_len == sizeof(stream));
1435                 stream.path_name[LTTNG_VIEWER_PATH_MAX - 1] = '\0';
1436                 stream.channel_name[LTTNG_VIEWER_NAME_MAX - 1] = '\0';
1437
1438                 printf_verbose("    stream %" PRIu64 " : %s/%s\n",
1439                                 be64toh(stream.id), stream.path_name,
1440                                 stream.channel_name);
1441                 ctx->session->streams[i].id = be64toh(stream.id);
1442                 ctx->session->streams[i].session = ctx->session;
1443
1444                 ctx->session->streams[i].first_read = 1;
1445                 ctx->session->streams[i].mmap_size = 0;
1446
1447                 if (be32toh(stream.metadata_flag)) {
1448                         ctx->session->streams[i].metadata_flag = 1;
1449                 }
1450                 ret = lttng_live_ctf_trace_assign(&ctx->session->streams[i],
1451                                 be64toh(stream.ctf_trace_id));
1452                 if (ret < 0) {
1453                         goto error;
1454                 }
1455                 nb_streams++;
1456
1457         }
1458         ret = nb_streams;
1459 end:
1460         return ret;
1461
1462 error:
1463         return -1;
1464 }
1465
1466 int lttng_live_read(struct lttng_live_ctx *ctx)
1467 {
1468         int ret = -1;
1469         int i;
1470         struct bt_ctf_iter *iter;
1471         const struct bt_ctf_event *event;
1472         struct bt_iter_pos begin_pos;
1473         struct bt_trace_descriptor *td_write;
1474         struct bt_format *fmt_write;
1475         struct ctf_text_stream_pos *sout;
1476         uint64_t id;
1477
1478         ctx->bt_ctx = bt_context_create();
1479         if (!ctx->bt_ctx) {
1480                 fprintf(stderr, "[error] bt_context_create allocation\n");
1481                 goto end;
1482         }
1483
1484         fmt_write = bt_lookup_format(g_quark_from_static_string("text"));
1485         if (!fmt_write) {
1486                 fprintf(stderr, "[error] ctf-text error\n");
1487                 goto end;
1488         }
1489
1490         td_write = fmt_write->open_trace(NULL, O_RDWR, NULL, NULL);
1491         if (!td_write) {
1492                 fprintf(stderr, "[error] Error opening output trace\n");
1493                 goto end_free;
1494         }
1495
1496         sout = container_of(td_write, struct ctf_text_stream_pos,
1497                         trace_descriptor);
1498         if (!sout->parent.event_cb) {
1499                 goto end_free;
1500         }
1501
1502         ret = lttng_live_create_viewer_session(ctx);
1503         if (ret < 0) {
1504                 goto end_free;
1505         }
1506
1507         for (i = 0; i < ctx->session_ids->len; i++) {
1508                 id = g_array_index(ctx->session_ids, uint64_t, i);
1509                 printf_verbose("Attaching to session %lu\n", id);
1510                 ret = lttng_live_attach_session(ctx, id);
1511                 printf_verbose("Attaching session returns %d\n", ret);
1512                 if (ret < 0) {
1513                         if (ret == -LTTNG_VIEWER_ATTACH_UNK) {
1514                                 fprintf(stderr, "[error] Unknown session ID\n");
1515                         }
1516                         goto end_free;
1517                 }
1518         }
1519
1520         /*
1521          * As long as the session is active, we try to get new streams.
1522          */
1523         for (;;) {
1524                 int flags;
1525
1526                 if (lttng_live_should_quit()) {
1527                         ret = 0;
1528                         goto end_free;
1529                 }
1530
1531                 while (!ctx->session->stream_count) {
1532                         if (lttng_live_should_quit()
1533                                         || ctx->session_ids->len == 0) {
1534                                 ret = 0;
1535                                 goto end_free;
1536                         }
1537                         ret = ask_new_streams(ctx);
1538                         if (ret < 0) {
1539                                 goto end_free;
1540                         }
1541                         if (!ctx->session->stream_count) {
1542                                 (void) poll(NULL, 0, ACTIVE_POLL_DELAY);
1543                         }
1544                 }
1545
1546                 g_hash_table_foreach(ctx->session->ctf_traces, add_traces,
1547                                 ctx->bt_ctx);
1548
1549                 begin_pos.type = BT_SEEK_BEGIN;
1550                 iter = bt_ctf_iter_create(ctx->bt_ctx, &begin_pos, NULL);
1551                 if (!iter) {
1552                         if (lttng_live_should_quit()) {
1553                                 ret = 0;
1554                                 goto end;
1555                         }
1556                         fprintf(stderr, "[error] Iterator creation error\n");
1557                         goto end;
1558                 }
1559                 for (;;) {
1560                         if (lttng_live_should_quit()) {
1561                                 ret = 0;
1562                                 goto end_free;
1563                         }
1564                         event = bt_ctf_iter_read_event_flags(iter, &flags);
1565                         if (!(flags & BT_ITER_FLAG_RETRY)) {
1566                                 if (!event) {
1567                                         /* End of trace */
1568                                         break;
1569                                 }
1570                                 ret = sout->parent.event_cb(&sout->parent,
1571                                                 event->parent->stream);
1572                                 if (ret) {
1573                                         fprintf(stderr, "[error] Writing "
1574                                                         "event failed.\n");
1575                                         goto end_free;
1576                                 }
1577                         }
1578                         ret = bt_iter_next(bt_ctf_get_iter(iter));
1579                         if (ret < 0) {
1580                                 goto end_free;
1581                         }
1582                 }
1583                 bt_ctf_iter_destroy(iter);
1584                 g_hash_table_foreach_remove(ctx->session->ctf_traces,
1585                                 del_traces, ctx->bt_ctx);
1586                 ctx->session->stream_count = 0;
1587         }
1588
1589 end_free:
1590         bt_context_put(ctx->bt_ctx);
1591 end:
1592         if (lttng_live_should_quit()) {
1593                 ret = 0;
1594         }
1595         return ret;
1596 }