tests/regression/tools/live/live_test.cpp

   1 /*
   2  * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <unistd.h>
  12 #include <common/compat/time.hpp>
  13 #include <sys/types.h>
  14 #include <inttypes.h>
  15 #include <stdlib.h>
  16 #include <sys/socket.h>
  17 #include <netinet/in.h>
  18 #include <netdb.h>
  19 #include <fcntl.h>
  20 #include <sys/mman.h>
  21 #include <sys/stat.h>
  22
  23 #include <tap/tap.h>
  24 #include <lttng/lttng.h>
  25
  26 #include <urcu/list.h>
  27 #include <common/common.hpp>
  28
  29 #include <bin/lttng-relayd/lttng-viewer-abi.hpp>
  30 #include <common/index/ctf-index.hpp>
  31
  32 #include <common/compat/errno.hpp>
  33 #include <common/compat/endian.hpp>
  34
  35 #define SESSION1 "test1"
  36 #define RELAYD_URL "net://localhost"
  37 #define LIVE_TIMER 2000000
  38
  39 /* Number of TAP tests in this file */
  40 #define NUM_TESTS 11
  41 #define mmap_size 524288
  42
  43 #ifdef HAVE_LIBLTTNG_UST_CTL
  44 #include <lttng/lttng-export.h>
  45 #include <lttng/ust-sigbus.h>
  46 LTTNG_EXPORT DEFINE_LTTNG_UST_SIGBUS_STATE();
  47 #endif
  48
  49 namespace {
  50 struct live_session *session;
  51 int control_sock;
  52
  53 int first_packet_offset;
  54 int first_packet_len;
  55 int first_packet_stream_id = -1;
  56
  57 struct viewer_stream {
  58         uint64_t id;
  59         uint64_t ctf_trace_id;
  60         void *mmap_base;
  61         int fd;
  62         int metadata_flag;
  63         int first_read;
  64         char path[PATH_MAX];
  65 };
  66
  67 struct live_session {
  68         struct viewer_stream *streams;
  69         uint64_t live_timer_interval;
  70         uint64_t stream_count;
  71 };
  72 } /* namespace */
  73
  74 static
  75 ssize_t lttng_live_recv(int fd, void *buf, size_t len)
  76 {
  77         ssize_t ret;
  78         size_t copied = 0, to_copy = len;
  79
  80         do {
  81                 ret = recv(fd, (char *) buf + copied, to_copy, 0);
  82                 if (ret > 0) {
  83                         LTTNG_ASSERT(ret <= to_copy);
  84                         copied += ret;
  85                         to_copy -= ret;
  86                 }
  87         } while ((ret > 0 && to_copy > 0)
  88                 || (ret < 0 && errno == EINTR));
  89         if (ret > 0)
  90                 ret = copied;
  91         /* ret = 0 means orderly shutdown, ret < 0 is error. */
  92         return ret;
  93 }
  94
  95 static
  96 ssize_t lttng_live_send(int fd, const void *buf, size_t len)
  97 {
  98         ssize_t ret;
  99
 100         do {
 101                 ret = send(fd, buf, len, MSG_NOSIGNAL);
 102         } while (ret < 0 && errno == EINTR);
 103         return ret;
 104 }
 105
 106 static
 107 int connect_viewer(const char *hostname)
 108 {
 109         struct hostent *host;
 110         struct sockaddr_in server_addr;
 111         int ret;
 112
 113         host = gethostbyname(hostname);
 114         if (!host) {
 115                 ret = -1;
 116                 goto end;
 117         }
 118
 119         if ((control_sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 120                 PERROR("Socket");
 121                 ret = -1;
 122                 goto end;
 123         }
 124
 125         server_addr.sin_family = AF_INET;
 126         server_addr.sin_port = htons(5344);
 127         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 128         bzero(&(server_addr.sin_zero), 8);
 129
 130         if (connect(control_sock, (struct sockaddr *) &server_addr,
 131                                 sizeof(struct sockaddr)) == -1) {
 132                 PERROR("Connect");
 133                 ret = -1;
 134                 goto end;
 135         }
 136
 137         server_addr.sin_family = AF_INET;
 138         server_addr.sin_port = htons(5345);
 139         server_addr.sin_addr = *((struct in_addr *) host->h_addr);
 140         bzero(&(server_addr.sin_zero), 8);
 141
 142         ret = 0;
 143
 144 end:
 145         return ret;
 146 }
 147
 148 static
 149 int establish_connection(void)
 150 {
 151         struct lttng_viewer_cmd cmd;
 152         struct lttng_viewer_connect connect;
 153         ssize_t ret_len;
 154
 155         cmd.cmd = htobe32(LTTNG_VIEWER_CONNECT);
 156         cmd.data_size = htobe64(sizeof(connect));
 157         cmd.cmd_version = htobe32(0);
 158
 159         memset(&connect, 0, sizeof(connect));
 160         connect.major = htobe32(VERSION_MAJOR);
 161         connect.minor = htobe32(VERSION_MINOR);
 162         connect.type = htobe32(LTTNG_VIEWER_CLIENT_COMMAND);
 163
 164         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 165         if (ret_len < 0) {
 166                 diag("Error sending cmd");
 167                 goto error;
 168         }
 169         ret_len = lttng_live_send(control_sock, &connect, sizeof(connect));
 170         if (ret_len < 0) {
 171                 diag("Error sending version");
 172                 goto error;
 173         }
 174
 175         ret_len = lttng_live_recv(control_sock, &connect, sizeof(connect));
 176         if (ret_len == 0) {
 177                 diag("[error] Remote side has closed connection");
 178                 goto error;
 179         }
 180         if (ret_len < 0) {
 181                 diag("Error receiving version");
 182                 goto error;
 183         }
 184         return 0;
 185
 186 error:
 187         return -1;
 188 }
 189
 190 /*
 191  * Returns the number of sessions, should be 1 during the unit test.
 192  */
 193 static
 194 int list_sessions(uint64_t *session_id)
 195 {
 196         struct lttng_viewer_cmd cmd;
 197         struct lttng_viewer_list_sessions list;
 198         struct lttng_viewer_session lsession;
 199         int i;
 200         ssize_t ret_len;
 201         int first_session = 0;
 202
 203         cmd.cmd = htobe32(LTTNG_VIEWER_LIST_SESSIONS);
 204         cmd.data_size = htobe64(0);
 205         cmd.cmd_version = htobe32(0);
 206
 207         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 208         if (ret_len < 0) {
 209                 diag("Error sending cmd");
 210                 goto error;
 211         }
 212
 213         ret_len = lttng_live_recv(control_sock, &list, sizeof(list));
 214         if (ret_len == 0) {
 215                 diag("[error] Remote side has closed connection");
 216                 goto error;
 217         }
 218         if (ret_len < 0) {
 219                 diag("Error receiving session list");
 220                 goto error;
 221         }
 222
 223         for (i = 0; i < be32toh(list.sessions_count); i++) {
 224                 ret_len = lttng_live_recv(control_sock, &lsession, sizeof(lsession));
 225                 if (ret_len < 0) {
 226                         diag("Error receiving session");
 227                         goto error;
 228                 }
 229                 if (lsession.streams > 0 && first_session <= 0) {
 230                         first_session = be64toh(lsession.id);
 231                         *session_id = first_session;
 232                 }
 233         }
 234
 235         return be32toh(list.sessions_count);
 236
 237 error:
 238         return -1;
 239 }
 240
 241 static
 242 int create_viewer_session(void)
 243 {
 244         struct lttng_viewer_cmd cmd;
 245         struct lttng_viewer_create_session_response resp;
 246         ssize_t ret_len;
 247
 248         cmd.cmd = htobe32(LTTNG_VIEWER_CREATE_SESSION);
 249         cmd.data_size = htobe64(0);
 250         cmd.cmd_version = htobe32(0);
 251
 252         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 253         if (ret_len < 0) {
 254                 diag("[error] Error sending cmd");
 255                 goto error;
 256         }
 257         LTTNG_ASSERT(ret_len == sizeof(cmd));
 258
 259         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 260         if (ret_len == 0) {
 261                 diag("[error] Remote side has closed connection");
 262                 goto error;
 263         }
 264         if (ret_len < 0) {
 265                 diag("[error] Error receiving create session reply");
 266                 goto error;
 267         }
 268         LTTNG_ASSERT(ret_len == sizeof(resp));
 269
 270         if (be32toh(resp.status) != LTTNG_VIEWER_CREATE_SESSION_OK) {
 271                 diag("[error] Error creating viewer session");
 272                 goto error;
 273         }
 274         return 0;
 275
 276 error:
 277         return -1;
 278 }
 279
 280 static
 281 int attach_session(uint64_t id)
 282 {
 283         struct lttng_viewer_cmd cmd;
 284         struct lttng_viewer_attach_session_request rq;
 285         struct lttng_viewer_attach_session_response rp;
 286         struct lttng_viewer_stream stream;
 287         int i;
 288         ssize_t ret_len;
 289
 290         session = zmalloc<live_session>();
 291         if (!session) {
 292                 goto error;
 293         }
 294
 295         cmd.cmd = htobe32(LTTNG_VIEWER_ATTACH_SESSION);
 296         cmd.data_size = htobe64(sizeof(rq));
 297         cmd.cmd_version = htobe32(0);
 298
 299         memset(&rq, 0, sizeof(rq));
 300         rq.session_id = htobe64(id);
 301         rq.seek = htobe32(LTTNG_VIEWER_SEEK_BEGINNING);
 302
 303         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 304         if (ret_len < 0) {
 305                 diag("Error sending cmd LTTNG_VIEWER_ATTACH_SESSION");
 306                 goto error;
 307         }
 308         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 309         if (ret_len < 0) {
 310                 diag("Error sending attach request");
 311                 goto error;
 312         }
 313
 314         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 315         if (ret_len == 0) {
 316                 diag("[error] Remote side has closed connection");
 317                 goto error;
 318         }
 319         if (ret_len < 0) {
 320                 diag("Error receiving attach response");
 321                 goto error;
 322         }
 323         if (be32toh(rp.status) != LTTNG_VIEWER_ATTACH_OK) {
 324                 goto error;
 325         }
 326
 327         session->stream_count = be32toh(rp.streams_count);
 328         if (session->stream_count == 0) {
 329                 diag("Got session stream count == 0");
 330                 goto error;
 331         }
 332         session->streams = calloc<viewer_stream>(session->stream_count);
 333         if (!session->streams) {
 334                 goto error;
 335         }
 336
 337         for (i = 0; i < be32toh(rp.streams_count); i++) {
 338                 ret_len = lttng_live_recv(control_sock, &stream, sizeof(stream));
 339                 if (ret_len == 0) {
 340                         diag("[error] Remote side has closed connection");
 341                         goto error;
 342                 }
 343                 if (ret_len < 0) {
 344                         diag("Error receiving stream");
 345                         goto error;
 346                 }
 347                 session->streams[i].id = be64toh(stream.id);
 348
 349                 session->streams[i].ctf_trace_id = be64toh(stream.ctf_trace_id);
 350                 session->streams[i].first_read = 1;
 351                 session->streams[i].mmap_base = mmap(NULL, mmap_size,
 352                                 PROT_READ | PROT_WRITE,
 353                                 MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
 354                 if (session->streams[i].mmap_base == MAP_FAILED) {
 355                         diag("mmap error");
 356                         goto error;
 357                 }
 358
 359                 if (be32toh(stream.metadata_flag)) {
 360                         session->streams[i].metadata_flag = 1;
 361                 }
 362         }
 363         return session->stream_count;
 364
 365 error:
 366         return -1;
 367 }
 368
 369 static
 370 int get_metadata(void)
 371 {
 372         struct lttng_viewer_cmd cmd;
 373         struct lttng_viewer_get_metadata rq;
 374         struct lttng_viewer_metadata_packet rp;
 375         ssize_t ret_len;
 376         int ret;
 377         uint64_t i;
 378         char *data = NULL;
 379         uint64_t len = 0;
 380         int metadata_stream_id = -1;
 381
 382         cmd.cmd = htobe32(LTTNG_VIEWER_GET_METADATA);
 383         cmd.data_size = htobe64(sizeof(rq));
 384         cmd.cmd_version = htobe32(0);
 385
 386         for (i = 0; i < session->stream_count; i++) {
 387                 if (session->streams[i].metadata_flag) {
 388                         metadata_stream_id = i;
 389                         break;
 390                 }
 391         }
 392
 393         if (metadata_stream_id < 0) {
 394                 diag("No metadata stream found");
 395                 goto error;
 396         }
 397
 398         rq.stream_id = htobe64(session->streams[metadata_stream_id].id);
 399
 400 retry:
 401         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 402         if (ret_len < 0) {
 403                 diag("Error sending cmd");
 404                 goto error;
 405         }
 406         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 407         if (ret_len < 0) {
 408                 diag("Error sending get_metadata request");
 409                 goto error;
 410         }
 411         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 412         if (ret_len == 0) {
 413                 diag("[error] Remote side has closed connection");
 414                 goto error;
 415         }
 416         if (ret_len < 0) {
 417                 diag("Error receiving metadata response");
 418                 goto error;
 419         }
 420         switch (be32toh(rp.status)) {
 421         case LTTNG_VIEWER_METADATA_OK:
 422                 break;
 423         case LTTNG_VIEWER_NO_NEW_METADATA:
 424                 diag("Got LTTNG_VIEWER_NO_NEW_METADATA:");
 425                 usleep(50);
 426                 goto retry;
 427         case LTTNG_VIEWER_METADATA_ERR:
 428                 diag("Got LTTNG_VIEWER_METADATA_ERR:");
 429                 goto error;
 430         default:
 431                 diag("Got unknown status during LTTNG_VIEWER_GET_METADATA");
 432                 goto error;
 433         }
 434
 435         len = be64toh(rp.len);
 436         if (len <= 0) {
 437                 goto error;
 438         }
 439
 440         data = calloc<char>(len);
 441         if (!data) {
 442                 PERROR("relay data zmalloc");
 443                 goto error;
 444         }
 445         ret_len = lttng_live_recv(control_sock, data, len);
 446         if (ret_len == 0) {
 447                 diag("[error] Remote side has closed connection");
 448                 goto error_free_data;
 449         }
 450         if (ret_len < 0) {
 451                 diag("Error receiving trace packet");
 452                 goto error_free_data;
 453         }
 454         free(data);
 455         ret = len;
 456
 457         return ret;
 458
 459 error_free_data:
 460         free(data);
 461 error:
 462         return -1;
 463 }
 464
 465 static
 466 int get_next_index(void)
 467 {
 468         struct lttng_viewer_cmd cmd;
 469         struct lttng_viewer_get_next_index rq;
 470         struct lttng_viewer_index rp;
 471         ssize_t ret_len;
 472         int id;
 473
 474         cmd.cmd = htobe32(LTTNG_VIEWER_GET_NEXT_INDEX);
 475         cmd.data_size = htobe64(sizeof(rq));
 476         cmd.cmd_version = htobe32(0);
 477
 478         for (id = 0; id < session->stream_count; id++) {
 479                 if (session->streams[id].metadata_flag) {
 480                         continue;
 481                 }
 482                 memset(&rq, 0, sizeof(rq));
 483                 rq.stream_id = htobe64(session->streams[id].id);
 484
 485 retry:
 486                 ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 487                 if (ret_len < 0) {
 488                         diag("Error sending cmd");
 489                         goto error;
 490                 }
 491                 ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 492                 if (ret_len < 0) {
 493                         diag("Error sending get_next_index request");
 494                         goto error;
 495                 }
 496                 ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 497                 if (ret_len == 0) {
 498                         diag("[error] Remote side has closed connection");
 499                         goto error;
 500                 }
 501                 if (ret_len < 0) {
 502                         diag("Error receiving index response");
 503                         goto error;
 504                 }
 505
 506                 rp.flags = be32toh(rp.flags);
 507
 508                 switch (be32toh(rp.status)) {
 509                 case LTTNG_VIEWER_INDEX_INACTIVE:
 510                         /* Skip this stream. */
 511                         diag("Got LTTNG_VIEWER_INDEX_INACTIVE");
 512                         continue;
 513                 case LTTNG_VIEWER_INDEX_OK:
 514                         break;
 515                 case LTTNG_VIEWER_INDEX_RETRY:
 516                         sleep(1);
 517                         goto retry;
 518                 case LTTNG_VIEWER_INDEX_HUP:
 519                         diag("Got LTTNG_VIEWER_INDEX_HUP");
 520                         session->streams[id].id = -1ULL;
 521                         session->streams[id].fd = -1;
 522                         goto error;
 523                 case LTTNG_VIEWER_INDEX_ERR:
 524                         diag("Got LTTNG_VIEWER_INDEX_ERR");
 525                         goto error;
 526                 default:
 527                         diag("Unknown reply status during LTTNG_VIEWER_GET_NEXT_INDEX (%d)", be32toh(rp.status));
 528                         goto error;
 529                 }
 530                 if (first_packet_stream_id < 0) {
 531                         /*
 532                          * Initialize the first packet stream id. That is,
 533                          * the first active stream encoutered.
 534                          */
 535                         first_packet_offset = be64toh(rp.offset);
 536                         first_packet_len = be64toh(rp.packet_size) / CHAR_BIT;
 537                         first_packet_stream_id = id;
 538                         diag("Got first packet index with offset %d and len %d",
 539                                         first_packet_offset, first_packet_len);
 540                 }
 541         }
 542         return 0;
 543
 544 error:
 545         return -1;
 546 }
 547
 548 static
 549 int get_data_packet(int id, uint64_t offset,
 550                 uint64_t len)
 551 {
 552         struct lttng_viewer_cmd cmd;
 553         struct lttng_viewer_get_packet rq;
 554         struct lttng_viewer_trace_packet rp;
 555         ssize_t ret_len;
 556
 557         cmd.cmd = htobe32(LTTNG_VIEWER_GET_PACKET);
 558         cmd.data_size = htobe64(sizeof(rq));
 559         cmd.cmd_version = htobe32(0);
 560
 561         memset(&rq, 0, sizeof(rq));
 562         rq.stream_id = htobe64(session->streams[id].id);
 563         /* Already in big endian. */
 564         rq.offset = offset;
 565         rq.len = htobe32(len);
 566
 567         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 568         if (ret_len < 0) {
 569                 diag("Error sending cmd");
 570                 goto error;
 571         }
 572         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 573         if (ret_len < 0) {
 574                 diag("Error sending get_data_packet request");
 575                 goto error;
 576         }
 577         ret_len = lttng_live_recv(control_sock, &rp, sizeof(rp));
 578         if (ret_len == 0) {
 579                 diag("[error] Remote side has closed connection");
 580                 goto error;
 581         }
 582         if (ret_len < 0) {
 583                 diag("Error receiving data response");
 584                 goto error;
 585         }
 586         rp.flags = be32toh(rp.flags);
 587
 588         switch (be32toh(rp.status)) {
 589         case LTTNG_VIEWER_GET_PACKET_OK:
 590                 len = be32toh(rp.len);
 591                 if (len == 0) {
 592                         diag("Got LTTNG_VIEWER_GET_PACKET_OK, but len == 0");
 593                         goto error;
 594                 }
 595                 break;
 596         case LTTNG_VIEWER_GET_PACKET_RETRY:
 597                 diag("Got LTTNG_VIEWER_GET_PACKET_RETRY:");
 598                 goto error;
 599         case LTTNG_VIEWER_GET_PACKET_ERR:
 600                 if (rp.flags & LTTNG_VIEWER_FLAG_NEW_METADATA) {
 601                         diag("Got LTTNG_VIEWER_GET_PACKET_ERR with NEW_METADATA flag");
 602                         goto end;
 603                 }
 604                 diag("Got LTTNG_VIEWER_GET_PACKET_ERR:");
 605                 goto error;
 606         default:
 607                 diag("Got unknown status code during LTTNG_VIEWER_GET_PACKET");
 608                 goto error;
 609         }
 610
 611         if (len > mmap_size) {
 612                 diag("mmap_size not big enough");
 613                 goto error;
 614         }
 615
 616         ret_len = lttng_live_recv(control_sock, session->streams[id].mmap_base, len);
 617         if (ret_len == 0) {
 618                 diag("[error] Remote side has closed connection");
 619                 goto error;
 620         }
 621         if (ret_len < 0) {
 622                 diag("Error receiving trace packet");
 623                 goto error;
 624         }
 625 end:
 626         return 0;
 627 error:
 628         return -1;
 629 }
 630
 631 static
 632 int detach_viewer_session(uint64_t id)
 633 {
 634         struct lttng_viewer_cmd cmd;
 635         struct lttng_viewer_detach_session_response resp;
 636         struct lttng_viewer_detach_session_request rq;
 637         int ret;
 638         ssize_t ret_len;
 639
 640         cmd.cmd = htobe32(LTTNG_VIEWER_DETACH_SESSION);
 641         cmd.data_size = htobe64(sizeof(rq));
 642         cmd.cmd_version = htobe32(0);
 643
 644         memset(&rq, 0, sizeof(rq));
 645         rq.session_id = htobe64(id);
 646
 647         ret_len = lttng_live_send(control_sock, &cmd, sizeof(cmd));
 648         if (ret_len < 0) {
 649                 fprintf(stderr, "[error] Error sending cmd\n");
 650                 ret = ret_len;
 651                 goto error;
 652         }
 653
 654         ret_len = lttng_live_send(control_sock, &rq, sizeof(rq));
 655         if (ret_len < 0) {
 656                 fprintf(stderr, "Error sending attach request\n");
 657                 ret = ret_len;
 658                 goto error;
 659         }
 660
 661         ret_len = lttng_live_recv(control_sock, &resp, sizeof(resp));
 662         if (ret_len < 0) {
 663                 fprintf(stderr, "[error] Error receiving detach session reply\n");
 664                 ret = ret_len;
 665                 goto error;
 666         }
 667
 668         if (be32toh(resp.status) != LTTNG_VIEWER_DETACH_SESSION_OK) {
 669                 fprintf(stderr, "[error] Error detaching viewer session\n");
 670                 ret = -1;
 671                 goto error;
 672         }
 673         ret = 0;
 674
 675 error:
 676         return ret;
 677 }
 678
 679 int main(void)
 680 {
 681         int ret;
 682         uint64_t session_id;
 683
 684         plan_tests(NUM_TESTS);
 685
 686         diag("Live unit tests");
 687
 688         ret = connect_viewer("localhost");
 689         ok(ret == 0, "Connect viewer to relayd");
 690
 691         ret = establish_connection();
 692         ok(ret == 0, "Established connection and version check with %d.%d",
 693                         VERSION_MAJOR, VERSION_MINOR);
 694
 695         ret = list_sessions(&session_id);
 696         ok(ret > 0, "List sessions : %d session(s)", ret);
 697         if (ret < 0) {
 698                 goto end;
 699         }
 700
 701         ret = create_viewer_session();
 702         ok(ret == 0, "Create viewer session");
 703
 704         ret = attach_session(session_id);
 705         ok(ret > 0, "Attach to session, %d stream(s) received", ret);
 706
 707         ret = get_metadata();
 708         ok(ret > 0, "Get metadata, received %d bytes", ret);
 709
 710         ret = get_next_index();
 711         ok(ret == 0, "Get one index per stream");
 712
 713         ret = get_data_packet(first_packet_stream_id, first_packet_offset,
 714                         first_packet_len);
 715         ok(ret == 0,
 716                         "Get one data packet for stream %d, offset %d, len %d",
 717                         first_packet_stream_id, first_packet_offset,
 718                         first_packet_len);
 719
 720         ret = detach_viewer_session(session_id);
 721         ok(ret == 0, "Detach viewer session");
 722
 723         ret = list_sessions(&session_id);
 724         ok(ret > 0, "List sessions : %d session(s)", ret);
 725
 726         ret = attach_session(session_id);
 727         ok(ret > 0, "Attach to session, %d streams received", ret);
 728 end:
 729         return exit_status();
 730 }