src/common/relayd/relayd.c

   1 /*
   2  * Copyright (C) 2012 - David Goulet <dgoulet@efficios.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License, version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along with
  14  * this program; if not, write to the Free Software Foundation, Inc., 51
  15  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <assert.h>
  20 #include <stdio.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <inttypes.h>
  25
  26 #include <common/common.h>
  27 #include <common/defaults.h>
  28 #include <common/sessiond-comm/relayd.h>
  29 #include <common/index/ctf-index.h>
  30
  31 #include "relayd.h"
  32
  33 /*
  34  * Send command. Fill up the header and append the data.
  35  */
  36 static int send_command(struct lttcomm_relayd_sock *rsock,
  37                 enum lttcomm_relayd_command cmd, void *data, size_t size,
  38                 int flags)
  39 {
  40         int ret;
  41         struct lttcomm_relayd_hdr header;
  42         char *buf;
  43         uint64_t buf_size = sizeof(header);
  44
  45         if (rsock->sock.fd < 0) {
  46                 return -ECONNRESET;
  47         }
  48
  49         if (data) {
  50                 buf_size += size;
  51         }
  52
  53         buf = zmalloc(buf_size);
  54         if (buf == NULL) {
  55                 PERROR("zmalloc relayd send command buf");
  56                 ret = -1;
  57                 goto alloc_error;
  58         }
  59
  60         memset(&header, 0, sizeof(header));
  61         header.cmd = htobe32(cmd);
  62         header.data_size = htobe64(size);
  63
  64         /* Zeroed for now since not used. */
  65         header.cmd_version = 0;
  66         header.circuit_id = 0;
  67
  68         /* Prepare buffer to send. */
  69         memcpy(buf, &header, sizeof(header));
  70         if (data) {
  71                 memcpy(buf + sizeof(header), data, size);
  72         }
  73
  74         ret = rsock->sock.ops->sendmsg(&rsock->sock, buf, buf_size, flags);
  75         if (ret < 0) {
  76                 ret = -errno;
  77                 goto error;
  78         }
  79
  80         DBG3("Relayd sending command %d of size %" PRIu64, cmd, buf_size);
  81
  82 error:
  83         free(buf);
  84 alloc_error:
  85         return ret;
  86 }
  87
  88 /*
  89  * Receive reply data on socket. This MUST be call after send_command or else
  90  * could result in unexpected behavior(s).
  91  */
  92 static int recv_reply(struct lttcomm_relayd_sock *rsock, void *data, size_t size)
  93 {
  94         int ret;
  95
  96         if (rsock->sock.fd < 0) {
  97                 return -ECONNRESET;
  98         }
  99
 100         DBG3("Relayd waiting for reply of size %zu", size);
 101
 102         ret = rsock->sock.ops->recvmsg(&rsock->sock, data, size, 0);
 103         if (ret <= 0 || ret != size) {
 104                 if (ret == 0) {
 105                         /* Orderly shutdown. */
 106                         DBG("Socket %d has performed an orderly shutdown", rsock->sock.fd);
 107                 } else {
 108                         DBG("Receiving reply failed on sock %d for size %zu with ret %d",
 109                                         rsock->sock.fd, size, ret);
 110                 }
 111                 /* Always return -1 here and the caller can use errno. */
 112                 ret = -1;
 113                 goto error;
 114         }
 115
 116 error:
 117         return ret;
 118 }
 119
 120 /*
 121  * Starting at 2.4, RELAYD_CREATE_SESSION takes additional parameters to
 122  * support the live reading capability.
 123  */
 124 static int relayd_create_session_2_4(struct lttcomm_relayd_sock *rsock,
 125                 uint64_t *session_id, char *session_name, char *hostname,
 126                 int session_live_timer, unsigned int snapshot)
 127 {
 128         int ret;
 129         struct lttcomm_relayd_create_session_2_4 msg;
 130
 131         strncpy(msg.session_name, session_name, sizeof(msg.session_name));
 132         strncpy(msg.hostname, hostname, sizeof(msg.hostname));
 133         msg.live_timer = htobe32(session_live_timer);
 134         msg.snapshot = htobe32(snapshot);
 135
 136         /* Send command */
 137         ret = send_command(rsock, RELAYD_CREATE_SESSION, &msg, sizeof(msg), 0);
 138         if (ret < 0) {
 139                 goto error;
 140         }
 141
 142 error:
 143         return ret;
 144 }
 145
 146 /*
 147  * RELAYD_CREATE_SESSION from 2.1 to 2.3.
 148  */
 149 static int relayd_create_session_2_1(struct lttcomm_relayd_sock *rsock,
 150                 uint64_t *session_id)
 151 {
 152         int ret;
 153
 154         /* Send command */
 155         ret = send_command(rsock, RELAYD_CREATE_SESSION, NULL, 0, 0);
 156         if (ret < 0) {
 157                 goto error;
 158         }
 159
 160 error:
 161         return ret;
 162 }
 163
 164 /*
 165  * Send a RELAYD_CREATE_SESSION command to the relayd with the given socket and
 166  * set session_id of the relayd if we have a successful reply from the relayd.
 167  *
 168  * On success, return 0 else a negative value which is either an errno error or
 169  * a lttng error code from the relayd.
 170  */
 171 int relayd_create_session(struct lttcomm_relayd_sock *rsock, uint64_t *session_id,
 172                 char *session_name, char *hostname, int session_live_timer,
 173                 unsigned int snapshot)
 174 {
 175         int ret;
 176         struct lttcomm_relayd_status_session reply;
 177
 178         assert(rsock);
 179         assert(session_id);
 180
 181         DBG("Relayd create session");
 182
 183         switch(rsock->minor) {
 184                 case 1:
 185                 case 2:
 186                 case 3:
 187                         ret = relayd_create_session_2_1(rsock, session_id);
 188                         break;
 189                 case 4:
 190                 default:
 191                         ret = relayd_create_session_2_4(rsock, session_id, session_name,
 192                                         hostname, session_live_timer, snapshot);
 193                         break;
 194         }
 195
 196         if (ret < 0) {
 197                 goto error;
 198         }
 199
 200         /* Receive response */
 201         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 202         if (ret < 0) {
 203                 goto error;
 204         }
 205
 206         reply.session_id = be64toh(reply.session_id);
 207         reply.ret_code = be32toh(reply.ret_code);
 208
 209         /* Return session id or negative ret code. */
 210         if (reply.ret_code != LTTNG_OK) {
 211                 ret = -1;
 212                 ERR("Relayd create session replied error %d", reply.ret_code);
 213                 goto error;
 214         } else {
 215                 ret = 0;
 216                 *session_id = reply.session_id;
 217         }
 218
 219         DBG("Relayd session created with id %" PRIu64, reply.session_id);
 220
 221 error:
 222         return ret;
 223 }
 224
 225 /*
 226  * Add stream on the relayd and assign stream handle to the stream_id argument.
 227  *
 228  * On success return 0 else return ret_code negative value.
 229  */
 230 int relayd_add_stream(struct lttcomm_relayd_sock *rsock, const char *channel_name,
 231                 const char *pathname, uint64_t *stream_id,
 232                 uint64_t tracefile_size, uint64_t tracefile_count)
 233 {
 234         int ret;
 235         struct lttcomm_relayd_add_stream msg;
 236         struct lttcomm_relayd_add_stream_2_2 msg_2_2;
 237         struct lttcomm_relayd_status_stream reply;
 238
 239         /* Code flow error. Safety net. */
 240         assert(rsock);
 241         assert(channel_name);
 242         assert(pathname);
 243
 244         DBG("Relayd adding stream for channel name %s", channel_name);
 245
 246         /* Compat with relayd 2.1 */
 247         if (rsock->minor == 1) {
 248                 memset(&msg, 0, sizeof(msg));
 249                 strncpy(msg.channel_name, channel_name, sizeof(msg.channel_name));
 250                 strncpy(msg.pathname, pathname, sizeof(msg.pathname));
 251
 252                 /* Send command */
 253                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg, sizeof(msg), 0);
 254                 if (ret < 0) {
 255                         goto error;
 256                 }
 257         } else {
 258                 memset(&msg_2_2, 0, sizeof(msg_2_2));
 259                 /* Compat with relayd 2.2+ */
 260                 strncpy(msg_2_2.channel_name, channel_name, sizeof(msg_2_2.channel_name));
 261                 strncpy(msg_2_2.pathname, pathname, sizeof(msg_2_2.pathname));
 262                 msg_2_2.tracefile_size = htobe64(tracefile_size);
 263                 msg_2_2.tracefile_count = htobe64(tracefile_count);
 264
 265                 /* Send command */
 266                 ret = send_command(rsock, RELAYD_ADD_STREAM, (void *) &msg_2_2, sizeof(msg_2_2), 0);
 267                 if (ret < 0) {
 268                         goto error;
 269                 }
 270         }
 271
 272         /* Waiting for reply */
 273         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 274         if (ret < 0) {
 275                 goto error;
 276         }
 277
 278         /* Back to host bytes order. */
 279         reply.handle = be64toh(reply.handle);
 280         reply.ret_code = be32toh(reply.ret_code);
 281
 282         /* Return session id or negative ret code. */
 283         if (reply.ret_code != LTTNG_OK) {
 284                 ret = -1;
 285                 ERR("Relayd add stream replied error %d", reply.ret_code);
 286         } else {
 287                 /* Success */
 288                 ret = 0;
 289                 *stream_id = reply.handle;
 290         }
 291
 292         DBG("Relayd stream added successfully with handle %" PRIu64,
 293                 reply.handle);
 294
 295 error:
 296         return ret;
 297 }
 298
 299 /*
 300  * Inform the relay that all the streams for the current channel has been sent.
 301  *
 302  * On success return 0 else return ret_code negative value.
 303  */
 304 int relayd_streams_sent(struct lttcomm_relayd_sock *rsock)
 305 {
 306         int ret;
 307         struct lttcomm_relayd_generic_reply reply;
 308
 309         /* Code flow error. Safety net. */
 310         assert(rsock);
 311
 312         DBG("Relayd sending streams sent.");
 313
 314         /* This feature was introduced in 2.4, ignore it for earlier versions. */
 315         if (rsock->minor < 4) {
 316                 ret = 0;
 317                 goto end;
 318         }
 319
 320         /* Send command */
 321         ret = send_command(rsock, RELAYD_STREAMS_SENT, NULL, 0, 0);
 322         if (ret < 0) {
 323                 goto error;
 324         }
 325
 326         /* Waiting for reply */
 327         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 328         if (ret < 0) {
 329                 goto error;
 330         }
 331
 332         /* Back to host bytes order. */
 333         reply.ret_code = be32toh(reply.ret_code);
 334
 335         /* Return session id or negative ret code. */
 336         if (reply.ret_code != LTTNG_OK) {
 337                 ret = -1;
 338                 ERR("Relayd streams sent replied error %d", reply.ret_code);
 339                 goto error;
 340         } else {
 341                 /* Success */
 342                 ret = 0;
 343         }
 344
 345         DBG("Relayd streams sent success");
 346
 347 error:
 348 end:
 349         return ret;
 350 }
 351
 352 /*
 353  * Check version numbers on the relayd.
 354  * If major versions are compatible, we assign minor_to_use to the
 355  * minor version of the procotol we are going to use for this session.
 356  *
 357  * Return 0 if compatible else negative value.
 358  */
 359 int relayd_version_check(struct lttcomm_relayd_sock *rsock)
 360 {
 361         int ret;
 362         struct lttcomm_relayd_version msg;
 363
 364         /* Code flow error. Safety net. */
 365         assert(rsock);
 366
 367         DBG("Relayd version check for major.minor %u.%u", rsock->major,
 368                         rsock->minor);
 369
 370         memset(&msg, 0, sizeof(msg));
 371         /* Prepare network byte order before transmission. */
 372         msg.major = htobe32(rsock->major);
 373         msg.minor = htobe32(rsock->minor);
 374
 375         /* Send command */
 376         ret = send_command(rsock, RELAYD_VERSION, (void *) &msg, sizeof(msg), 0);
 377         if (ret < 0) {
 378                 goto error;
 379         }
 380
 381         /* Receive response */
 382         ret = recv_reply(rsock, (void *) &msg, sizeof(msg));
 383         if (ret < 0) {
 384                 goto error;
 385         }
 386
 387         /* Set back to host bytes order */
 388         msg.major = be32toh(msg.major);
 389         msg.minor = be32toh(msg.minor);
 390
 391         /*
 392          * Only validate the major version. If the other side is higher,
 393          * communication is not possible. Only major version equal can talk to each
 394          * other. If the minor version differs, the lowest version is used by both
 395          * sides.
 396          */
 397         if (msg.major != rsock->major) {
 398                 /* Not compatible */
 399                 ret = -1;
 400                 DBG2("Relayd version is NOT compatible. Relayd version %u != %u (us)",
 401                                 msg.major, rsock->major);
 402                 goto error;
 403         }
 404
 405         /*
 406          * If the relayd's minor version is higher, it will adapt to our version so
 407          * we can continue to use the latest relayd communication data structure.
 408          * If the received minor version is higher, the relayd should adapt to us.
 409          */
 410         if (rsock->minor > msg.minor) {
 411                 rsock->minor = msg.minor;
 412         }
 413
 414         /* Version number compatible */
 415         DBG2("Relayd version is compatible, using protocol version %u.%u",
 416                         rsock->major, rsock->minor);
 417         ret = 0;
 418
 419 error:
 420         return ret;
 421 }
 422
 423 /*
 424  * Add stream on the relayd and assign stream handle to the stream_id argument.
 425  *
 426  * On success return 0 else return ret_code negative value.
 427  */
 428 int relayd_send_metadata(struct lttcomm_relayd_sock *rsock, size_t len)
 429 {
 430         int ret;
 431
 432         /* Code flow error. Safety net. */
 433         assert(rsock);
 434
 435         DBG("Relayd sending metadata of size %zu", len);
 436
 437         /* Send command */
 438         ret = send_command(rsock, RELAYD_SEND_METADATA, NULL, len, 0);
 439         if (ret < 0) {
 440                 goto error;
 441         }
 442
 443         DBG2("Relayd metadata added successfully");
 444
 445         /*
 446          * After that call, the metadata data MUST be sent to the relayd so the
 447          * receive size on the other end matches the len of the metadata packet
 448          * header. This is why we don't wait for a reply here.
 449          */
 450
 451 error:
 452         return ret;
 453 }
 454
 455 /*
 456  * Connect to relay daemon with an allocated lttcomm_relayd_sock.
 457  */
 458 int relayd_connect(struct lttcomm_relayd_sock *rsock)
 459 {
 460         /* Code flow error. Safety net. */
 461         assert(rsock);
 462
 463         if (!rsock->sock.ops) {
 464                 /*
 465                  * Attempting a connect on a non-initialized socket.
 466                  */
 467                 return -ECONNRESET;
 468         }
 469
 470         DBG3("Relayd connect ...");
 471
 472         return rsock->sock.ops->connect(&rsock->sock);
 473 }
 474
 475 /*
 476  * Close relayd socket with an allocated lttcomm_relayd_sock.
 477  *
 478  * If no socket operations are found, simply return 0 meaning that everything
 479  * is fine. Without operations, the socket can not possibly be opened or used.
 480  * This is possible if the socket was allocated but not created. However, the
 481  * caller could simply use it to store a valid file descriptor for instance
 482  * passed over a Unix socket and call this to cleanup but still without a valid
 483  * ops pointer.
 484  *
 485  * Return the close returned value. On error, a negative value is usually
 486  * returned back from close(2).
 487  */
 488 int relayd_close(struct lttcomm_relayd_sock *rsock)
 489 {
 490         int ret;
 491
 492         /* Code flow error. Safety net. */
 493         assert(rsock);
 494
 495         /* An invalid fd is fine, return success. */
 496         if (rsock->sock.fd < 0) {
 497                 ret = 0;
 498                 goto end;
 499         }
 500
 501         DBG3("Relayd closing socket %d", rsock->sock.fd);
 502
 503         if (rsock->sock.ops) {
 504                 ret = rsock->sock.ops->close(&rsock->sock);
 505         } else {
 506                 /* Default call if no specific ops found. */
 507                 ret = close(rsock->sock.fd);
 508                 if (ret < 0) {
 509                         PERROR("relayd_close default close");
 510                 }
 511         }
 512         rsock->sock.fd = -1;
 513
 514 end:
 515         return ret;
 516 }
 517
 518 /*
 519  * Send data header structure to the relayd.
 520  */
 521 int relayd_send_data_hdr(struct lttcomm_relayd_sock *rsock,
 522                 struct lttcomm_relayd_data_hdr *hdr, size_t size)
 523 {
 524         int ret;
 525
 526         /* Code flow error. Safety net. */
 527         assert(rsock);
 528         assert(hdr);
 529
 530         if (rsock->sock.fd < 0) {
 531                 return -ECONNRESET;
 532         }
 533
 534         DBG3("Relayd sending data header of size %zu", size);
 535
 536         /* Again, safety net */
 537         if (size == 0) {
 538                 size = sizeof(struct lttcomm_relayd_data_hdr);
 539         }
 540
 541         /* Only send data header. */
 542         ret = rsock->sock.ops->sendmsg(&rsock->sock, hdr, size, 0);
 543         if (ret < 0) {
 544                 ret = -errno;
 545                 goto error;
 546         }
 547
 548         /*
 549          * The data MUST be sent right after that command for the receive on the
 550          * other end to match the size in the header.
 551          */
 552
 553 error:
 554         return ret;
 555 }
 556
 557 /*
 558  * Send close stream command to the relayd.
 559  */
 560 int relayd_send_close_stream(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 561                 uint64_t last_net_seq_num)
 562 {
 563         int ret;
 564         struct lttcomm_relayd_close_stream msg;
 565         struct lttcomm_relayd_generic_reply reply;
 566
 567         /* Code flow error. Safety net. */
 568         assert(rsock);
 569
 570         DBG("Relayd closing stream id %" PRIu64, stream_id);
 571
 572         memset(&msg, 0, sizeof(msg));
 573         msg.stream_id = htobe64(stream_id);
 574         msg.last_net_seq_num = htobe64(last_net_seq_num);
 575
 576         /* Send command */
 577         ret = send_command(rsock, RELAYD_CLOSE_STREAM, (void *) &msg, sizeof(msg), 0);
 578         if (ret < 0) {
 579                 goto error;
 580         }
 581
 582         /* Receive response */
 583         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 584         if (ret < 0) {
 585                 goto error;
 586         }
 587
 588         reply.ret_code = be32toh(reply.ret_code);
 589
 590         /* Return session id or negative ret code. */
 591         if (reply.ret_code != LTTNG_OK) {
 592                 ret = -1;
 593                 ERR("Relayd close stream replied error %d", reply.ret_code);
 594         } else {
 595                 /* Success */
 596                 ret = 0;
 597         }
 598
 599         DBG("Relayd close stream id %" PRIu64 " successfully", stream_id);
 600
 601 error:
 602         return ret;
 603 }
 604
 605 /*
 606  * Check for data availability for a given stream id.
 607  *
 608  * Return 0 if NOT pending, 1 if so and a negative value on error.
 609  */
 610 int relayd_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t stream_id,
 611                 uint64_t last_net_seq_num)
 612 {
 613         int ret;
 614         struct lttcomm_relayd_data_pending msg;
 615         struct lttcomm_relayd_generic_reply reply;
 616
 617         /* Code flow error. Safety net. */
 618         assert(rsock);
 619
 620         DBG("Relayd data pending for stream id %" PRIu64, stream_id);
 621
 622         memset(&msg, 0, sizeof(msg));
 623         msg.stream_id = htobe64(stream_id);
 624         msg.last_net_seq_num = htobe64(last_net_seq_num);
 625
 626         /* Send command */
 627         ret = send_command(rsock, RELAYD_DATA_PENDING, (void *) &msg,
 628                         sizeof(msg), 0);
 629         if (ret < 0) {
 630                 goto error;
 631         }
 632
 633         /* Receive response */
 634         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 635         if (ret < 0) {
 636                 goto error;
 637         }
 638
 639         reply.ret_code = be32toh(reply.ret_code);
 640
 641         /* Return session id or negative ret code. */
 642         if (reply.ret_code >= LTTNG_OK) {
 643                 ERR("Relayd data pending replied error %d", reply.ret_code);
 644         }
 645
 646         /* At this point, the ret code is either 1 or 0 */
 647         ret = reply.ret_code;
 648
 649         DBG("Relayd data is %s pending for stream id %" PRIu64,
 650                         ret == 1 ? "" : "NOT", stream_id);
 651
 652 error:
 653         return ret;
 654 }
 655
 656 /*
 657  * Check on the relayd side for a quiescent state on the control socket.
 658  */
 659 int relayd_quiescent_control(struct lttcomm_relayd_sock *rsock,
 660                 uint64_t metadata_stream_id)
 661 {
 662         int ret;
 663         struct lttcomm_relayd_quiescent_control msg;
 664         struct lttcomm_relayd_generic_reply reply;
 665
 666         /* Code flow error. Safety net. */
 667         assert(rsock);
 668
 669         DBG("Relayd checking quiescent control state");
 670
 671         memset(&msg, 0, sizeof(msg));
 672         msg.stream_id = htobe64(metadata_stream_id);
 673
 674         /* Send command */
 675         ret = send_command(rsock, RELAYD_QUIESCENT_CONTROL, &msg, sizeof(msg), 0);
 676         if (ret < 0) {
 677                 goto error;
 678         }
 679
 680         /* Receive response */
 681         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 682         if (ret < 0) {
 683                 goto error;
 684         }
 685
 686         reply.ret_code = be32toh(reply.ret_code);
 687
 688         /* Return session id or negative ret code. */
 689         if (reply.ret_code != LTTNG_OK) {
 690                 ret = -1;
 691                 ERR("Relayd quiescent control replied error %d", reply.ret_code);
 692                 goto error;
 693         }
 694
 695         /* Control socket is quiescent */
 696         return 0;
 697
 698 error:
 699         return ret;
 700 }
 701
 702 /*
 703  * Begin a data pending command for a specific session id.
 704  */
 705 int relayd_begin_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id)
 706 {
 707         int ret;
 708         struct lttcomm_relayd_begin_data_pending msg;
 709         struct lttcomm_relayd_generic_reply reply;
 710
 711         /* Code flow error. Safety net. */
 712         assert(rsock);
 713
 714         DBG("Relayd begin data pending");
 715
 716         memset(&msg, 0, sizeof(msg));
 717         msg.session_id = htobe64(id);
 718
 719         /* Send command */
 720         ret = send_command(rsock, RELAYD_BEGIN_DATA_PENDING, &msg, sizeof(msg), 0);
 721         if (ret < 0) {
 722                 goto error;
 723         }
 724
 725         /* Receive response */
 726         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 727         if (ret < 0) {
 728                 goto error;
 729         }
 730
 731         reply.ret_code = be32toh(reply.ret_code);
 732
 733         /* Return session id or negative ret code. */
 734         if (reply.ret_code != LTTNG_OK) {
 735                 ret = -1;
 736                 ERR("Relayd begin data pending replied error %d", reply.ret_code);
 737                 goto error;
 738         }
 739
 740         return 0;
 741
 742 error:
 743         return ret;
 744 }
 745
 746 /*
 747  * End a data pending command for a specific session id.
 748  *
 749  * Return 0 on success and set is_data_inflight to 0 if no data is being
 750  * streamed or 1 if it is the case.
 751  */
 752 int relayd_end_data_pending(struct lttcomm_relayd_sock *rsock, uint64_t id,
 753                 unsigned int *is_data_inflight)
 754 {
 755         int ret, recv_ret;
 756         struct lttcomm_relayd_end_data_pending msg;
 757         struct lttcomm_relayd_generic_reply reply;
 758
 759         /* Code flow error. Safety net. */
 760         assert(rsock);
 761
 762         DBG("Relayd end data pending");
 763
 764         memset(&msg, 0, sizeof(msg));
 765         msg.session_id = htobe64(id);
 766
 767         /* Send command */
 768         ret = send_command(rsock, RELAYD_END_DATA_PENDING, &msg, sizeof(msg), 0);
 769         if (ret < 0) {
 770                 goto error;
 771         }
 772
 773         /* Receive response */
 774         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 775         if (ret < 0) {
 776                 goto error;
 777         }
 778
 779         recv_ret = be32toh(reply.ret_code);
 780         if (recv_ret < 0) {
 781                 ret = recv_ret;
 782                 goto error;
 783         }
 784
 785         *is_data_inflight = recv_ret;
 786
 787         DBG("Relayd end data pending is data inflight: %d", recv_ret);
 788
 789         return 0;
 790
 791 error:
 792         return ret;
 793 }
 794
 795 /*
 796  * Send index to the relayd.
 797  */
 798 int relayd_send_index(struct lttcomm_relayd_sock *rsock,
 799                 struct ctf_packet_index *index, uint64_t relay_stream_id,
 800                 uint64_t net_seq_num)
 801 {
 802         int ret;
 803         struct lttcomm_relayd_index msg;
 804         struct lttcomm_relayd_generic_reply reply;
 805
 806         /* Code flow error. Safety net. */
 807         assert(rsock);
 808
 809         if (rsock->minor < 4) {
 810                 DBG("Not sending indexes before protocol 2.4");
 811                 ret = 0;
 812                 goto error;
 813         }
 814
 815         DBG("Relayd sending index for stream ID %" PRIu64, relay_stream_id);
 816
 817         memset(&msg, 0, sizeof(msg));
 818         msg.relay_stream_id = htobe64(relay_stream_id);
 819         msg.net_seq_num = htobe64(net_seq_num);
 820
 821         /* The index is already in big endian. */
 822         msg.packet_size = index->packet_size;
 823         msg.content_size = index->content_size;
 824         msg.timestamp_begin = index->timestamp_begin;
 825         msg.timestamp_end = index->timestamp_end;
 826         msg.events_discarded = index->events_discarded;
 827         msg.stream_id = index->stream_id;
 828
 829         /* Send command */
 830         ret = send_command(rsock, RELAYD_SEND_INDEX, &msg, sizeof(msg), 0);
 831         if (ret < 0) {
 832                 goto error;
 833         }
 834
 835         /* Receive response */
 836         ret = recv_reply(rsock, (void *) &reply, sizeof(reply));
 837         if (ret < 0) {
 838                 goto error;
 839         }
 840
 841         reply.ret_code = be32toh(reply.ret_code);
 842
 843         /* Return session id or negative ret code. */
 844         if (reply.ret_code != LTTNG_OK) {
 845                 ret = -1;
 846                 ERR("Relayd send index replied error %d", reply.ret_code);
 847         } else {
 848                 /* Success */
 849                 ret = 0;
 850         }
 851
 852 error:
 853         return ret;
 854 }