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