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 #ifdef HAVE_LIBLTTNG_UST_CTL
  45 #include <lttng/ust-sigbus.h>
  46 DEFINE_LTTNG_UST_SIGBUS_STATE();
  47 #endif
  48
  49 static int control_sock;
  50 struct live_session *session;
  51
  52 static int first_packet_offset;
  53 static int first_packet_len;
  54 static int first_packet_stream_id = -1;
  55
  56 struct viewer_stream {
  57         uint64_t id;
  58         uint64_t ctf_trace_id;
  59         void *mmap_base;
  60         int fd;
  61         int metadata_flag;
  62         int first_read;
  63         char path[PATH_MAX];
  64 };
  65
  66 struct live_session {
  67         struct viewer_stream *streams;
  68         uint64_t live_timer_interval;
  69         uint64_t stream_count;
  70 };
  71
  72 static
  73 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
  74 {
  75         ssize_t ret;
  76         size_t copied = 0, to_copy = len;
  77
  78         do {
  79                 ret = recv(fd, buf + copied, to_copy, 0);
  80                 if (ret > 0) {
  81                         assert(ret <= to_copy);
  82                         copied += ret;
  83                         to_copy -= ret;
  84                 }
  85         } while ((ret > 0 && to_copy > 0)
  86                 || (ret < 0 && errno == EINTR));
  87         if (ret > 0)
  88                 ret = copied;
  89         /* ret = 0 means orderly shutdown, ret < 0 is error. */
  90         return ret;
  91 }
  92
  93 static
  94 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
  95 {
  96         ssize_t ret;
  97
  98         do {
  99                 ret = send(fd, buf, len, MSG_NOSIGNAL);
 100         } while (ret < 0 && errno == EINTR);
 101         return ret;
 102 }
 103
 104 static
 105 int connect_viewer(const char *hostname)
 106 {
 107         struct hostent *host;
 108         struct sockaddr_in server_addr;
 109         int ret;
 110
 111         host = gethostbyname(hostname);
 112         if (!host) {
 113                 ret = -1;
 114                 goto end;
 115         }
 116
 117         if ((control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 118                 PERROR("Socket");
 119                 ret = -1;
 120                 goto end;
 121         }
 122
 123         server_addr.sin_family = AF_INET;
 124         server_addr.sin_port = htons(5344);
 125         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 126         bzero(&(server_addr.sin_zero), 8);
 127
 128         if (connect(control_sock, (struct sockaddr *) &server_addr,
 129                                 sizeof(struct sockaddr)) == -1) {
 130                 PERROR("Connect");
 131                 ret = -1;
 132                 goto end;
 133         }
 134
 135         server_addr.sin_family = AF_INET;
 136         server_addr.sin_port = htons(5345);
 137         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 138         bzero(&(server_addr.sin_zero), 8);
 139
 140         ret = 0;
 141
 142 end:
 143         return ret;
 144 }
 145
 146 static
 147 int establish_connection(void)
 148 {
 149         struct lttng_viewer_cmd cmd;
 150         struct lttng_viewer_connect connect;
 151         ssize_t ret_len;
 152
 153         cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
 154         cmd.data_size = htobe64(sizeof(connect));
 155         cmd.cmd_version = htobe32(0);
 156
 157         memset(&connect, 0, sizeof(connect));
 158         connect.major = htobe32(VERSION_MAJOR);
 159         connect.minor = htobe32(VERSION_MINOR);
 160         connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
 161
 162         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 163         if (ret_len < 0) {
 164                 diag("Error sending cmd");
 165                 goto error;
 166         }
 167         ret_len = lttng_live_send(control_sock, &connect, sizeof(connect));
 168         if (ret_len < 0) {
 169                 diag("Error sending version");
 170                 goto error;
 171         }
 172
 173         ret_len = lttng_live_recv(control_sock, &connect, sizeof(connect));
 174         if (ret_len == 0) {
 175                 diag("[error] Remote side has closed connection");
 176                 goto error;
 177         }
 178         if (ret_len < 0) {
 179                 diag("Error receiving version");
 180                 goto error;
 181         }
 182         return 0;
 183
 184 error:
 185         return -1;
 186 }
 187
 188 /*
 189  * Returns the number of sessions, should be 1 during the unit test.
 190  */
 191 static
 192 int list_sessions(uint64_t *session_id)
 193 {
 194         struct lttng_viewer_cmd cmd;
 195         struct lttng_viewer_list_sessions list;
 196         struct lttng_viewer_session lsession;
 197         int i;
 198         ssize_t ret_len;
 199         int first_session = 0;
 200
 201         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 202         cmd.data_size = htobe64(0);
 203         cmd.cmd_version = htobe32(0);
 204
 205         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 206         if (ret_len < 0) {
 207                 diag("Error sending cmd");
 208                 goto error;
 209         }
 210
 211         ret_len = lttng_live_recv(control_sock, &list, sizeof(list));
 212         if (ret_len == 0) {
 213                 diag("[error] Remote side has closed connection");
 214                 goto error;
 215         }
 216         if (ret_len < 0) {
 217                 diag("Error receiving session list");
 218                 goto error;
 219         }
 220
 221         for (i = 0; i < be32toh(list.sessions_count); i++) {
 222                 ret_len = lttng_live_recv(control_sock, &lsession, sizeof(lsession));
 223                 if (ret_len < 0) {
 224                         diag("Error receiving session");
 225                         goto error;
 226                 }
 227                 if (lsession.streams > 0 && first_session <= 0) {
 228                         first_session = be64toh(lsession.id);
 229                         *session_id = first_session;
 230                 }
 231         }
 232
 233         return be32toh(list.sessions_count);
 234
 235 error:
 236         return -1;
 237 }
 238
 239 static
 240 int create_viewer_session(void)
 241 {
 242         struct lttng_viewer_cmd cmd;
 243         struct lttng_viewer_create_session_response resp;
 244         ssize_t ret_len;
 245
 246         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
 247         cmd.data_size = htobe64(0);
 248         cmd.cmd_version = htobe32(0);
 249
 250         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 251         if (ret_len < 0) {
 252                 diag("[error] Error sending cmd");
 253                 goto error;
 254         }
 255         assert(ret_len == sizeof(cmd));
 256
 257         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 258         if (ret_len == 0) {
 259                 diag("[error] Remote side has closed connection");
 260                 goto error;
 261         }
 262         if (ret_len < 0) {
 263                 diag("[error] Error receiving create session reply");
 264                 goto error;
 265         }
 266         assert(ret_len == sizeof(resp));
 267
 268         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
 269                 diag("[error] Error creating viewer session");
 270                 goto error;
 271         }
 272         return 0;
 273
 274 error:
 275         return -1;
 276 }
 277
 278 static
 279 int attach_session(uint64_t id)
 280 {
 281         struct lttng_viewer_cmd cmd;
 282         struct lttng_viewer_attach_session_request rq;
 283         struct lttng_viewer_attach_session_response rp;
 284         struct lttng_viewer_stream stream;
 285         int i;
 286         ssize_t ret_len;
 287
 288         session = zmalloc(sizeof(struct live_session));
 289         if (!session) {
 290                 goto error;
 291         }
 292
 293         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 294         cmd.data_size = htobe64(sizeof(rq));
 295         cmd.cmd_version = htobe32(0);
 296
 297         memset(&rq, 0, sizeof(rq));
 298         rq.session_id = htobe64(id);
 299         rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 300
 301         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 302         if (ret_len < 0) {
 303                 diag("Error sending cmd LTTNG_VIEWER_ATTACH_SESSION");
 304                 goto error;
 305         }
 306         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 307         if (ret_len < 0) {
 308                 diag("Error sending attach request");
 309                 goto error;
 310         }
 311
 312         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 313         if (ret_len == 0) {
 314                 diag("[error] Remote side has closed connection");
 315                 goto error;
 316         }
 317         if (ret_len < 0) {
 318                 diag("Error receiving attach response");
 319                 goto error;
 320         }
 321         if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
 322                 goto error;
 323         }
 324
 325         session->stream_count = be32toh(rp.streams_count);
 326         if (session->stream_count == 0) {
 327                 diag("Got session stream count == 0");
 328                 goto error;
 329         }
 330         session->streams = zmalloc(session->stream_count *
 331                         sizeof(struct viewer_stream));
 332         if (!session->streams) {
 333                 goto error;
 334         }
 335
 336         for (i = 0; i < be32toh(rp.streams_count); i++) {
 337                 ret_len = lttng_live_recv(control_sock, &stream, sizeof(stream));
 338                 if (ret_len == 0) {
 339                         diag("[error] Remote side has closed connection");
 340                         goto error;
 341                 }
 342                 if (ret_len < 0) {
 343                         diag("Error receiving stream");
 344                         goto error;
 345                 }
 346                 session->streams[i].id = be64toh(stream.id);
 347
 348                 session->streams[i].ctf_trace_id = be64toh(stream.ctf_trace_id);
 349                 session->streams[i].first_read = 1;
 350                 session->streams[i].mmap_base = mmap(NULL, mmap_size,
 351                                 PROT_READ | PROT_WRITE,
 352                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 353                 if (session->streams[i].mmap_base == MAP_FAILED) {
 354                         diag("mmap error");
 355                         goto error;
 356                 }
 357
 358                 if (be32toh(stream.metadata_flag)) {
 359                         session->streams[i].metadata_flag = 1;
 360                 }
 361         }
 362         return session->stream_count;
 363
 364 error:
 365         return -1;
 366 }
 367
 368 static
 369 int get_metadata(void)
 370 {
 371         struct lttng_viewer_cmd cmd;
 372         struct lttng_viewer_get_metadata rq;
 373         struct lttng_viewer_metadata_packet rp;
 374         ssize_t ret_len;
 375         int ret;
 376         uint64_t i;
 377         char *data = NULL;
 378         uint64_t len = 0;
 379         int metadata_stream_id = -1;
 380
 381         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 382         cmd.data_size = htobe64(sizeof(rq));
 383         cmd.cmd_version = htobe32(0);
 384
 385         for (i = 0; i < session->stream_count; i++) {
 386                 if (session->streams[i].metadata_flag) {
 387                         metadata_stream_id = i;
 388                         break;
 389                 }
 390         }
 391
 392         if (metadata_stream_id < 0) {
 393                 diag("No metadata stream found");
 394                 goto error;
 395         }
 396
 397         rq.stream_id = htobe64(session->streams[metadata_stream_id].id);
 398
 399 retry:
 400         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 401         if (ret_len < 0) {
 402                 diag("Error sending cmd");
 403                 goto error;
 404         }
 405         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 406         if (ret_len < 0) {
 407                 diag("Error sending get_metadata request");
 408                 goto error;
 409         }
 410         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 411         if (ret_len == 0) {
 412                 diag("[error] Remote side has closed connection");
 413                 goto error;
 414         }
 415         if (ret_len < 0) {
 416                 diag("Error receiving metadata response");
 417                 goto error;
 418         }
 419         switch (be32toh(rp.status)) {
 420         case LTTNG_VIEWER_METADATA_OK:
 421                 break;
 422         case LTTNG_VIEWER_NO_NEW_METADATA:
 423                 diag("Got LTTNG_VIEWER_NO_NEW_METADATA:");
 424                 usleep(50);
 425                 goto retry;
 426         case LTTNG_VIEWER_METADATA_ERR:
 427                 diag("Got LTTNG_VIEWER_METADATA_ERR:");
 428                 goto error;
 429         default:
 430                 diag("Got unknown status during LTTNG_VIEWER_GET_METADATA");
 431                 goto error;
 432         }
 433
 434         len = be64toh(rp.len);
 435         if (len <= 0) {
 436                 goto error;
 437         }
 438
 439         data = zmalloc(len);
 440         if (!data) {
 441                 PERROR("relay data zmalloc");
 442                 goto error;
 443         }
 444         ret_len = lttng_live_recv(control_sock, data, len);
 445         if (ret_len == 0) {
 446                 diag("[error] Remote side has closed connection");
 447                 goto error_free_data;
 448         }
 449         if (ret_len < 0) {
 450                 diag("Error receiving trace packet");
 451                 goto error_free_data;
 452         }
 453         free(data);
 454         ret = len;
 455
 456         return ret;
 457
 458 error_free_data:
 459         free(data);
 460 error:
 461         return -1;
 462 }
 463
 464 static
 465 int get_next_index(void)
 466 {
 467         struct lttng_viewer_cmd cmd;
 468         struct lttng_viewer_get_next_index rq;
 469         struct lttng_viewer_index rp;
 470         ssize_t ret_len;
 471         int id;
 472
 473         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
 474         cmd.data_size = htobe64(sizeof(rq));
 475         cmd.cmd_version = htobe32(0);
 476
 477         for (id = 0; id < session->stream_count; id++) {
 478                 if (session->streams[id].metadata_flag) {
 479                         continue;
 480                 }
 481                 memset(&rq, 0, sizeof(rq));
 482                 rq.stream_id = htobe64(session->streams[id].id);
 483
 484 retry:
 485                 ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 486                 if (ret_len < 0) {
 487                         diag("Error sending cmd");
 488                         goto error;
 489                 }
 490                 ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 491                 if (ret_len < 0) {
 492                         diag("Error sending get_next_index request");
 493                         goto error;
 494                 }
 495                 ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 496                 if (ret_len == 0) {
 497                         diag("[error] Remote side has closed connection");
 498                         goto error;
 499                 }
 500                 if (ret_len < 0) {
 501                         diag("Error receiving index response");
 502                         goto error;
 503                 }
 504
 505                 rp.flags = be32toh(rp.flags);
 506
 507                 switch (be32toh(rp.status)) {
 508                 case LTTNG_VIEWER_INDEX_INACTIVE:
 509                         /* Skip this stream. */
 510                         diag("Got LTTNG_VIEWER_INDEX_INACTIVE");
 511                         continue;
 512                 case LTTNG_VIEWER_INDEX_OK:
 513                         break;
 514                 case LTTNG_VIEWER_INDEX_RETRY:
 515                         sleep(1);
 516                         goto retry;
 517                 case LTTNG_VIEWER_INDEX_HUP:
 518                         diag("Got LTTNG_VIEWER_INDEX_HUP");
 519                         session->streams[id].id = -1ULL;
 520                         session->streams[id].fd = -1;
 521                         goto error;
 522                 case LTTNG_VIEWER_INDEX_ERR:
 523                         diag("Got LTTNG_VIEWER_INDEX_ERR");
 524                         goto error;
 525                 default:
 526                         diag("Unknown reply status during LTTNG_VIEWER_GET_NEXT_INDEX (%d)", be32toh(rp.status));
 527                         goto error;
 528                 }
 529                 if (first_packet_stream_id < 0) {
 530                         /*
 531                          * Initialize the first packet stream id. That is,
 532                          * the first active stream encoutered.
 533                          */
 534                         first_packet_offset = be64toh(rp.offset);
 535                         first_packet_len = be64toh(rp.packet_size) / CHAR_BIT;
 536                         first_packet_stream_id = id;
 537                         diag("Got first packet index with offset %d and len %d",
 538                                         first_packet_offset, first_packet_len);
 539                 }
 540         }
 541         return 0;
 542
 543 error:
 544         return -1;
 545 }
 546
 547 static
 548 int get_data_packet(int id, uint64_t offset,
 549                 uint64_t len)
 550 {
 551         struct lttng_viewer_cmd cmd;
 552         struct lttng_viewer_get_packet rq;
 553         struct lttng_viewer_trace_packet rp;
 554         ssize_t ret_len;
 555
 556         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
 557         cmd.data_size = htobe64(sizeof(rq));
 558         cmd.cmd_version = htobe32(0);
 559
 560         memset(&rq, 0, sizeof(rq));
 561         rq.stream_id = htobe64(session->streams[id].id);
 562         /* Already in big endian. */
 563         rq.offset = offset;
 564         rq.len = htobe32(len);
 565
 566         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 567         if (ret_len < 0) {
 568                 diag("Error sending cmd");
 569                 goto error;
 570         }
 571         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 572         if (ret_len < 0) {
 573                 diag("Error sending get_data_packet request");
 574                 goto error;
 575         }
 576         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 577         if (ret_len == 0) {
 578                 diag("[error] Remote side has closed connection");
 579                 goto error;
 580         }
 581         if (ret_len < 0) {
 582                 diag("Error receiving data response");
 583                 goto error;
 584         }
 585         rp.flags = be32toh(rp.flags);
 586
 587         switch (be32toh(rp.status)) {
 588         case LTTNG_VIEWER_GET_PACKET_OK:
 589                 len = be32toh(rp.len);
 590                 if (len == 0) {
 591                         diag("Got LTTNG_VIEWER_GET_PACKET_OK, but len == 0");
 592                         goto error;
 593                 }
 594                 break;
 595         case LTTNG_VIEWER_GET_PACKET_RETRY:
 596                 diag("Got LTTNG_VIEWER_GET_PACKET_RETRY:");
 597                 goto error;
 598         case LTTNG_VIEWER_GET_PACKET_ERR:
 599                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 600                         diag("Got LTTNG_VIEWER_GET_PACKET_ERR with NEW_METADATA flag");
 601                         goto end;
 602                 }
 603                 diag("Got LTTNG_VIEWER_GET_PACKET_ERR:");
 604                 goto error;
 605         default:
 606                 diag("Got unknown status code during LTTNG_VIEWER_GET_PACKET");
 607                 goto error;
 608         }
 609
 610         if (len > mmap_size) {
 611                 diag("mmap_size not big enough");
 612                 goto error;
 613         }
 614
 615         ret_len = lttng_live_recv(control_sock, session->streams[id].mmap_base, len);
 616         if (ret_len == 0) {
 617                 diag("[error] Remote side has closed connection");
 618                 goto error;
 619         }
 620         if (ret_len < 0) {
 621                 diag("Error receiving trace packet");
 622                 goto error;
 623         }
 624 end:
 625         return 0;
 626 error:
 627         return -1;
 628 }
 629
 630 static
 631 int detach_viewer_session(uint64_t id)
 632 {
 633         struct lttng_viewer_cmd cmd;
 634         struct lttng_viewer_detach_session_response resp;
 635         struct lttng_viewer_detach_session_request rq;
 636         int ret;
 637         ssize_t ret_len;
 638
 639         cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
 640         cmd.data_size = htobe64(sizeof(rq));
 641         cmd.cmd_version = htobe32(0);
 642
 643         memset(&rq, 0, sizeof(rq));
 644         rq.session_id = htobe64(id);
 645
 646         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 647         if (ret_len < 0) {
 648                 fprintf(stderr, "[error] Error sending cmd\n");
 649                 ret = ret_len;
 650                 goto error;
 651         }
 652
 653         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 654         if (ret_len < 0) {
 655                 fprintf(stderr, "Error sending attach request\n");
 656                 ret = ret_len;
 657                 goto error;
 658         }
 659
 660         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 661         if (ret_len < 0) {
 662                 fprintf(stderr, "[error] Error receiving detach session reply\n");
 663                 ret = ret_len;
 664                 goto error;
 665         }
 666
 667         if (be32toh(resp.status) != LTTNG_VIEWER_DETACH_SESSION_OK) {
 668                 fprintf(stderr, "[error] Error detaching viewer session\n");
 669                 ret = -1;
 670                 goto error;
 671         }
 672         ret = 0;
 673
 674 error:
 675         return ret;
 676 }
 677
 678 int main(int argc, char **argv)
 679 {
 680         int ret;
 681         uint64_t session_id;
 682
 683         plan_tests(NUM_TESTS);
 684
 685         diag("Live unit tests");
 686
 687         ret = connect_viewer("localhost");
 688         ok(ret == 0, "Connect viewer to relayd");
 689
 690         ret = establish_connection();
 691         ok(ret == 0, "Established connection and version check with %d.%d",
 692                         VERSION_MAJOR, VERSION_MINOR);
 693
 694         ret = list_sessions(&session_id);
 695         ok(ret > 0, "List sessions : %d session(s)", ret);
 696         if (ret < 0) {
 697                 goto end;
 698         }
 699
 700         ret = create_viewer_session();
 701         ok(ret == 0, "Create viewer session");
 702
 703         ret = attach_session(session_id);
 704         ok(ret > 0, "Attach to session, %d stream(s) received", ret);
 705
 706         ret = get_metadata();
 707         ok(ret > 0, "Get metadata, received %d bytes", ret);
 708
 709         ret = get_next_index();
 710         ok(ret == 0, "Get one index per stream");
 711
 712         ret = get_data_packet(first_packet_stream_id, first_packet_offset,
 713                         first_packet_len);
 714         ok(ret == 0,
 715                         "Get one data packet for stream %d, offset %d, len %d",
 716                         first_packet_stream_id, first_packet_offset,
 717                         first_packet_len);
 718
 719         ret = detach_viewer_session(session_id);
 720         ok(ret == 0, "Detach viewer session");
 721
 722         ret = list_sessions(&session_id);
 723         ok(ret > 0, "List sessions : %d session(s)", ret);
 724
 725         ret = attach_session(session_id);
 726         ok(ret > 0, "Attach to session, %d streams received", ret);
 727 end:
 728         return exit_status();
 729 }