tests/regression/tools/live/live_test.c

   1 /*
   2  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #include <assert.h>
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <unistd.h>
  13 #include <common/compat/time.h>
  14 #include <sys/types.h>
  15 #include <inttypes.h>
  16 #include <stdlib.h>
  17 #include <sys/socket.h>
  18 #include <netinet/in.h>
  19 #include <netdb.h>
  20 #include <fcntl.h>
  21 #include <sys/mman.h>
  22 #include <sys/stat.h>
  23
  24 #include <tap/tap.h>
  25 #include <lttng/lttng.h>
  26
  27 #include <urcu/list.h>
  28 #include <common/common.h>
  29
  30 #include <bin/lttng-relayd/lttng-viewer-abi.h>
  31 #include <common/index/ctf-index.h>
  32
  33 #include <common/compat/errno.h>
  34 #include <common/compat/endian.h>
  35
  36 #define SESSION1 "test1"
  37 #define RELAYD_URL "net://localhost"
  38 #define LIVE_TIMER 2000000
  39
  40 /* Number of TAP tests in this file */
  41 #define NUM_TESTS 11
  42 #define mmap_size 524288
  43
  44 static int control_sock;
  45 struct live_session *session;
  46
  47 static int first_packet_offset;
  48 static int first_packet_len;
  49 static int first_packet_stream_id = -1;
  50
  51 struct viewer_stream {
  52         uint64_t id;
  53         uint64_t ctf_trace_id;
  54         void *mmap_base;
  55         int fd;
  56         int metadata_flag;
  57         int first_read;
  58         char path[PATH_MAX];
  59 };
  60
  61 struct live_session {
  62         struct viewer_stream *streams;
  63         uint64_t live_timer_interval;
  64         uint64_t stream_count;
  65 };
  66
  67 static
  68 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
  69 {
  70         ssize_t ret;
  71         size_t copied = 0, to_copy = len;
  72
  73         do {
  74                 ret = recv(fd, buf + copied, to_copy, 0);
  75                 if (ret > 0) {
  76                         assert(ret <= to_copy);
  77                         copied += ret;
  78                         to_copy -= ret;
  79                 }
  80         } while ((ret > 0 && to_copy > 0)
  81                 || (ret < 0 && errno == EINTR));
  82         if (ret > 0)
  83                 ret = copied;
  84         /* ret = 0 means orderly shutdown, ret < 0 is error. */
  85         return ret;
  86 }
  87
  88 static
  89 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
  90 {
  91         ssize_t ret;
  92
  93         do {
  94                 ret = send(fd, buf, len, MSG_NOSIGNAL);
  95         } while (ret < 0 && errno == EINTR);
  96         return ret;
  97 }
  98
  99 static
 100 int connect_viewer(const char *hostname)
 101 {
 102         struct hostent *host;
 103         struct sockaddr_in server_addr;
 104         int ret;
 105
 106         host = gethostbyname(hostname);
 107         if (!host) {
 108                 ret = -1;
 109                 goto end;
 110         }
 111
 112         if ((control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 113                 PERROR("Socket");
 114                 ret = -1;
 115                 goto end;
 116         }
 117
 118         server_addr.sin_family = AF_INET;
 119         server_addr.sin_port = htons(5344);
 120         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 121         bzero(&(server_addr.sin_zero), 8);
 122
 123         if (connect(control_sock, (struct sockaddr *) &server_addr,
 124                                 sizeof(struct sockaddr)) == -1) {
 125                 PERROR("Connect");
 126                 ret = -1;
 127                 goto end;
 128         }
 129
 130         server_addr.sin_family = AF_INET;
 131         server_addr.sin_port = htons(5345);
 132         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 133         bzero(&(server_addr.sin_zero), 8);
 134
 135         ret = 0;
 136
 137 end:
 138         return ret;
 139 }
 140
 141 static
 142 int establish_connection(void)
 143 {
 144         struct lttng_viewer_cmd cmd;
 145         struct lttng_viewer_connect connect;
 146         ssize_t ret_len;
 147
 148         cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
 149         cmd.data_size = htobe64(sizeof(connect));
 150         cmd.cmd_version = htobe32(0);
 151
 152         memset(&connect, 0, sizeof(connect));
 153         connect.major = htobe32(VERSION_MAJOR);
 154         connect.minor = htobe32(VERSION_MINOR);
 155         connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
 156
 157         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 158         if (ret_len < 0) {
 159                 diag("Error sending cmd");
 160                 goto error;
 161         }
 162         ret_len = lttng_live_send(control_sock, &connect, sizeof(connect));
 163         if (ret_len < 0) {
 164                 diag("Error sending version");
 165                 goto error;
 166         }
 167
 168         ret_len = lttng_live_recv(control_sock, &connect, sizeof(connect));
 169         if (ret_len == 0) {
 170                 diag("[error] Remote side has closed connection");
 171                 goto error;
 172         }
 173         if (ret_len < 0) {
 174                 diag("Error receiving version");
 175                 goto error;
 176         }
 177         return 0;
 178
 179 error:
 180         return -1;
 181 }
 182
 183 /*
 184  * Returns the number of sessions, should be 1 during the unit test.
 185  */
 186 static
 187 int list_sessions(uint64_t *session_id)
 188 {
 189         struct lttng_viewer_cmd cmd;
 190         struct lttng_viewer_list_sessions list;
 191         struct lttng_viewer_session lsession;
 192         int i;
 193         ssize_t ret_len;
 194         int first_session = 0;
 195
 196         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 197         cmd.data_size = htobe64(0);
 198         cmd.cmd_version = htobe32(0);
 199
 200         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 201         if (ret_len < 0) {
 202                 diag("Error sending cmd");
 203                 goto error;
 204         }
 205
 206         ret_len = lttng_live_recv(control_sock, &list, sizeof(list));
 207         if (ret_len == 0) {
 208                 diag("[error] Remote side has closed connection");
 209                 goto error;
 210         }
 211         if (ret_len < 0) {
 212                 diag("Error receiving session list");
 213                 goto error;
 214         }
 215
 216         for (i = 0; i < be32toh(list.sessions_count); i++) {
 217                 ret_len = lttng_live_recv(control_sock, &lsession, sizeof(lsession));
 218                 if (ret_len < 0) {
 219                         diag("Error receiving session");
 220                         goto error;
 221                 }
 222                 if (lsession.streams > 0 && first_session <= 0) {
 223                         first_session = be64toh(lsession.id);
 224                         *session_id = first_session;
 225                 }
 226         }
 227
 228         return be32toh(list.sessions_count);
 229
 230 error:
 231         return -1;
 232 }
 233
 234 static
 235 int create_viewer_session(void)
 236 {
 237         struct lttng_viewer_cmd cmd;
 238         struct lttng_viewer_create_session_response resp;
 239         ssize_t ret_len;
 240
 241         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
 242         cmd.data_size = htobe64(0);
 243         cmd.cmd_version = htobe32(0);
 244
 245         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 246         if (ret_len < 0) {
 247                 diag("[error] Error sending cmd");
 248                 goto error;
 249         }
 250         assert(ret_len == sizeof(cmd));
 251
 252         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 253         if (ret_len == 0) {
 254                 diag("[error] Remote side has closed connection");
 255                 goto error;
 256         }
 257         if (ret_len < 0) {
 258                 diag("[error] Error receiving create session reply");
 259                 goto error;
 260         }
 261         assert(ret_len == sizeof(resp));
 262
 263         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
 264                 diag("[error] Error creating viewer session");
 265                 goto error;
 266         }
 267         return 0;
 268
 269 error:
 270         return -1;
 271 }
 272
 273 static
 274 int attach_session(uint64_t id)
 275 {
 276         struct lttng_viewer_cmd cmd;
 277         struct lttng_viewer_attach_session_request rq;
 278         struct lttng_viewer_attach_session_response rp;
 279         struct lttng_viewer_stream stream;
 280         int i;
 281         ssize_t ret_len;
 282
 283         session = zmalloc(sizeof(struct live_session));
 284         if (!session) {
 285                 goto error;
 286         }
 287
 288         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 289         cmd.data_size = htobe64(sizeof(rq));
 290         cmd.cmd_version = htobe32(0);
 291
 292         memset(&rq, 0, sizeof(rq));
 293         rq.session_id = htobe64(id);
 294         rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 295
 296         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 297         if (ret_len < 0) {
 298                 diag("Error sending cmd LTTNG_VIEWER_ATTACH_SESSION");
 299                 goto error;
 300         }
 301         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 302         if (ret_len < 0) {
 303                 diag("Error sending attach request");
 304                 goto error;
 305         }
 306
 307         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 308         if (ret_len == 0) {
 309                 diag("[error] Remote side has closed connection");
 310                 goto error;
 311         }
 312         if (ret_len < 0) {
 313                 diag("Error receiving attach response");
 314                 goto error;
 315         }
 316         if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
 317                 goto error;
 318         }
 319
 320         session->stream_count = be32toh(rp.streams_count);
 321         if (session->stream_count == 0) {
 322                 diag("Got session stream count == 0");
 323                 goto error;
 324         }
 325         session->streams = zmalloc(session->stream_count *
 326                         sizeof(struct viewer_stream));
 327         if (!session->streams) {
 328                 goto error;
 329         }
 330
 331         for (i = 0; i < be32toh(rp.streams_count); i++) {
 332                 ret_len = lttng_live_recv(control_sock, &stream, sizeof(stream));
 333                 if (ret_len == 0) {
 334                         diag("[error] Remote side has closed connection");
 335                         goto error;
 336                 }
 337                 if (ret_len < 0) {
 338                         diag("Error receiving stream");
 339                         goto error;
 340                 }
 341                 session->streams[i].id = be64toh(stream.id);
 342
 343                 session->streams[i].ctf_trace_id = be64toh(stream.ctf_trace_id);
 344                 session->streams[i].first_read = 1;
 345                 session->streams[i].mmap_base = mmap(NULL, mmap_size,
 346                                 PROT_READ | PROT_WRITE,
 347                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 348                 if (session->streams[i].mmap_base == MAP_FAILED) {
 349                         diag("mmap error");
 350                         goto error;
 351                 }
 352
 353                 if (be32toh(stream.metadata_flag)) {
 354                         session->streams[i].metadata_flag = 1;
 355                 }
 356         }
 357         return session->stream_count;
 358
 359 error:
 360         return -1;
 361 }
 362
 363 static
 364 int get_metadata(void)
 365 {
 366         struct lttng_viewer_cmd cmd;
 367         struct lttng_viewer_get_metadata rq;
 368         struct lttng_viewer_metadata_packet rp;
 369         ssize_t ret_len;
 370         int ret;
 371         uint64_t i;
 372         char *data = NULL;
 373         uint64_t len = 0;
 374         int metadata_stream_id = -1;
 375
 376         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 377         cmd.data_size = htobe64(sizeof(rq));
 378         cmd.cmd_version = htobe32(0);
 379
 380         for (i = 0; i < session->stream_count; i++) {
 381                 if (session->streams[i].metadata_flag) {
 382                         metadata_stream_id = i;
 383                         break;
 384                 }
 385         }
 386
 387         if (metadata_stream_id < 0) {
 388                 diag("No metadata stream found");
 389                 goto error;
 390         }
 391
 392         rq.stream_id = htobe64(session->streams[metadata_stream_id].id);
 393
 394 retry:
 395         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 396         if (ret_len < 0) {
 397                 diag("Error sending cmd");
 398                 goto error;
 399         }
 400         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 401         if (ret_len < 0) {
 402                 diag("Error sending get_metadata request");
 403                 goto error;
 404         }
 405         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 406         if (ret_len == 0) {
 407                 diag("[error] Remote side has closed connection");
 408                 goto error;
 409         }
 410         if (ret_len < 0) {
 411                 diag("Error receiving metadata response");
 412                 goto error;
 413         }
 414         switch (be32toh(rp.status)) {
 415         case LTTNG_VIEWER_METADATA_OK:
 416                 break;
 417         case LTTNG_VIEWER_NO_NEW_METADATA:
 418                 diag("Got LTTNG_VIEWER_NO_NEW_METADATA:");
 419                 usleep(50);
 420                 goto retry;
 421         case LTTNG_VIEWER_METADATA_ERR:
 422                 diag("Got LTTNG_VIEWER_METADATA_ERR:");
 423                 goto error;
 424         default:
 425                 diag("Got unknown status during LTTNG_VIEWER_GET_METADATA");
 426                 goto error;
 427         }
 428
 429         len = be64toh(rp.len);
 430         if (len <= 0) {
 431                 goto error;
 432         }
 433
 434         data = zmalloc(len);
 435         if (!data) {
 436                 PERROR("relay data zmalloc");
 437                 goto error;
 438         }
 439         ret_len = lttng_live_recv(control_sock, data, len);
 440         if (ret_len == 0) {
 441                 diag("[error] Remote side has closed connection");
 442                 goto error_free_data;
 443         }
 444         if (ret_len < 0) {
 445                 diag("Error receiving trace packet");
 446                 goto error_free_data;
 447         }
 448         free(data);
 449         ret = len;
 450
 451         return ret;
 452
 453 error_free_data:
 454         free(data);
 455 error:
 456         return -1;
 457 }
 458
 459 static
 460 int get_next_index(void)
 461 {
 462         struct lttng_viewer_cmd cmd;
 463         struct lttng_viewer_get_next_index rq;
 464         struct lttng_viewer_index rp;
 465         ssize_t ret_len;
 466         int id;
 467
 468         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
 469         cmd.data_size = htobe64(sizeof(rq));
 470         cmd.cmd_version = htobe32(0);
 471
 472         for (id = 0; id < session->stream_count; id++) {
 473                 if (session->streams[id].metadata_flag) {
 474                         continue;
 475                 }
 476                 memset(&rq, 0, sizeof(rq));
 477                 rq.stream_id = htobe64(session->streams[id].id);
 478
 479 retry:
 480                 ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 481                 if (ret_len < 0) {
 482                         diag("Error sending cmd");
 483                         goto error;
 484                 }
 485                 ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 486                 if (ret_len < 0) {
 487                         diag("Error sending get_next_index request");
 488                         goto error;
 489                 }
 490                 ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 491                 if (ret_len == 0) {
 492                         diag("[error] Remote side has closed connection");
 493                         goto error;
 494                 }
 495                 if (ret_len < 0) {
 496                         diag("Error receiving index response");
 497                         goto error;
 498                 }
 499
 500                 rp.flags = be32toh(rp.flags);
 501
 502                 switch (be32toh(rp.status)) {
 503                 case LTTNG_VIEWER_INDEX_INACTIVE:
 504                         /* Skip this stream. */
 505                         diag("Got LTTNG_VIEWER_INDEX_INACTIVE");
 506                         continue;
 507                 case LTTNG_VIEWER_INDEX_OK:
 508                         break;
 509                 case LTTNG_VIEWER_INDEX_RETRY:
 510                         sleep(1);
 511                         goto retry;
 512                 case LTTNG_VIEWER_INDEX_HUP:
 513                         diag("Got LTTNG_VIEWER_INDEX_HUP");
 514                         session->streams[id].id = -1ULL;
 515                         session->streams[id].fd = -1;
 516                         goto error;
 517                 case LTTNG_VIEWER_INDEX_ERR:
 518                         diag("Got LTTNG_VIEWER_INDEX_ERR");
 519                         goto error;
 520                 default:
 521                         diag("Unknown reply status during LTTNG_VIEWER_GET_NEXT_INDEX (%d)", be32toh(rp.status));
 522                         goto error;
 523                 }
 524                 if (first_packet_stream_id < 0) {
 525                         /*
 526                          * Initialize the first packet stream id. That is,
 527                          * the first active stream encoutered.
 528                          */
 529                         first_packet_offset = be64toh(rp.offset);
 530                         first_packet_len = be64toh(rp.packet_size) / CHAR_BIT;
 531                         first_packet_stream_id = id;
 532                         diag("Got first packet index with offset %d and len %d",
 533                                         first_packet_offset, first_packet_len);
 534                 }
 535         }
 536         return 0;
 537
 538 error:
 539         return -1;
 540 }
 541
 542 static
 543 int get_data_packet(int id, uint64_t offset,
 544                 uint64_t len)
 545 {
 546         struct lttng_viewer_cmd cmd;
 547         struct lttng_viewer_get_packet rq;
 548         struct lttng_viewer_trace_packet rp;
 549         ssize_t ret_len;
 550
 551         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
 552         cmd.data_size = htobe64(sizeof(rq));
 553         cmd.cmd_version = htobe32(0);
 554
 555         memset(&rq, 0, sizeof(rq));
 556         rq.stream_id = htobe64(session->streams[id].id);
 557         /* Already in big endian. */
 558         rq.offset = offset;
 559         rq.len = htobe32(len);
 560
 561         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 562         if (ret_len < 0) {
 563                 diag("Error sending cmd");
 564                 goto error;
 565         }
 566         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 567         if (ret_len < 0) {
 568                 diag("Error sending get_data_packet request");
 569                 goto error;
 570         }
 571         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 572         if (ret_len == 0) {
 573                 diag("[error] Remote side has closed connection");
 574                 goto error;
 575         }
 576         if (ret_len < 0) {
 577                 diag("Error receiving data response");
 578                 goto error;
 579         }
 580         rp.flags = be32toh(rp.flags);
 581
 582         switch (be32toh(rp.status)) {
 583         case LTTNG_VIEWER_GET_PACKET_OK:
 584                 len = be32toh(rp.len);
 585                 if (len == 0) {
 586                         diag("Got LTTNG_VIEWER_GET_PACKET_OK, but len == 0");
 587                         goto error;
 588                 }
 589                 break;
 590         case LTTNG_VIEWER_GET_PACKET_RETRY:
 591                 diag("Got LTTNG_VIEWER_GET_PACKET_RETRY:");
 592                 goto error;
 593         case LTTNG_VIEWER_GET_PACKET_ERR:
 594                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 595                         diag("Got LTTNG_VIEWER_GET_PACKET_ERR with NEW_METADATA flag");
 596                         goto end;
 597                 }
 598                 diag("Got LTTNG_VIEWER_GET_PACKET_ERR:");
 599                 goto error;
 600         default:
 601                 diag("Got unknown status code during LTTNG_VIEWER_GET_PACKET");
 602                 goto error;
 603         }
 604
 605         if (len > mmap_size) {
 606                 diag("mmap_size not big enough");
 607                 goto error;
 608         }
 609
 610         ret_len = lttng_live_recv(control_sock, session->streams[id].mmap_base, len);
 611         if (ret_len == 0) {
 612                 diag("[error] Remote side has closed connection");
 613                 goto error;
 614         }
 615         if (ret_len < 0) {
 616                 diag("Error receiving trace packet");
 617                 goto error;
 618         }
 619 end:
 620         return 0;
 621 error:
 622         return -1;
 623 }
 624
 625 static
 626 int detach_viewer_session(uint64_t id)
 627 {
 628         struct lttng_viewer_cmd cmd;
 629         struct lttng_viewer_detach_session_response resp;
 630         struct lttng_viewer_detach_session_request rq;
 631         int ret;
 632         ssize_t ret_len;
 633
 634         cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
 635         cmd.data_size = htobe64(sizeof(rq));
 636         cmd.cmd_version = htobe32(0);
 637
 638         memset(&rq, 0, sizeof(rq));
 639         rq.session_id = htobe64(id);
 640
 641         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 642         if (ret_len < 0) {
 643                 fprintf(stderr, "[error] Error sending cmd\n");
 644                 ret = ret_len;
 645                 goto error;
 646         }
 647
 648         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 649         if (ret_len < 0) {
 650                 fprintf(stderr, "Error sending attach request\n");
 651                 ret = ret_len;
 652                 goto error;
 653         }
 654
 655         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 656         if (ret_len < 0) {
 657                 fprintf(stderr, "[error] Error receiving detach session reply\n");
 658                 ret = ret_len;
 659                 goto error;
 660         }
 661
 662         if (be32toh(resp.status) != LTTNG_VIEWER_DETACH_SESSION_OK) {
 663                 fprintf(stderr, "[error] Error detaching viewer session\n");
 664                 ret = -1;
 665                 goto error;
 666         }
 667         ret = 0;
 668
 669 error:
 670         return ret;
 671 }
 672
 673 int main(int argc, char **argv)
 674 {
 675         int ret;
 676         uint64_t session_id;
 677
 678         plan_tests(NUM_TESTS);
 679
 680         diag("Live unit tests");
 681
 682         ret = connect_viewer("localhost");
 683         ok(ret == 0, "Connect viewer to relayd");
 684
 685         ret = establish_connection();
 686         ok(ret == 0, "Established connection and version check with %d.%d",
 687                         VERSION_MAJOR, VERSION_MINOR);
 688
 689         ret = list_sessions(&session_id);
 690         ok(ret > 0, "List sessions : %d session(s)", ret);
 691         if (ret < 0) {
 692                 goto end;
 693         }
 694
 695         ret = create_viewer_session();
 696         ok(ret == 0, "Create viewer session");
 697
 698         ret = attach_session(session_id);
 699         ok(ret > 0, "Attach to session, %d stream(s) received", ret);
 700
 701         ret = get_metadata();
 702         ok(ret > 0, "Get metadata, received %d bytes", ret);
 703
 704         ret = get_next_index();
 705         ok(ret == 0, "Get one index per stream");
 706
 707         ret = get_data_packet(first_packet_stream_id, first_packet_offset,
 708                         first_packet_len);
 709         ok(ret == 0,
 710                         "Get one data packet for stream %d, offset %d, len %d",
 711                         first_packet_stream_id, first_packet_offset,
 712                         first_packet_len);
 713
 714         ret = detach_viewer_session(session_id);
 715         ok(ret == 0, "Detach viewer session");
 716
 717         ret = list_sessions(&session_id);
 718         ok(ret > 0, "List sessions : %d session(s)", ret);
 719
 720         ret = attach_session(session_id);
 721         ok(ret > 0, "Attach to session, %d streams received", ret);
 722 end:
 723         return exit_status();
 724 }