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