src/bin/lttng-sessiond/consumer.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 <sys/types.h>
  25 #include <unistd.h>
  26
  27 #include <common/common.h>
  28 #include <common/defaults.h>
  29 #include <common/uri.h>
  30
  31 #include "consumer.h"
  32
  33 /*
  34  * Receive a reply command status message from the consumer. Consumer socket
  35  * lock MUST be acquired before calling this function.
  36  *
  37  * Return 0 on success, -1 on recv error or a negative lttng error code which
  38  * was possibly returned by the consumer.
  39  */
  40 int consumer_recv_status_reply(struct consumer_socket *sock)
  41 {
  42         int ret;
  43         struct lttcomm_consumer_status_msg reply;
  44
  45         assert(sock);
  46
  47         ret = lttcomm_recv_unix_sock(sock->fd, &reply, sizeof(reply));
  48         if (ret <= 0) {
  49                 if (ret == 0) {
  50                         /* Orderly shutdown. Don't return 0 which means success. */
  51                         ret = -1;
  52                 }
  53                 /* The above call will print a PERROR on error. */
  54                 DBG("Fail to receive status reply on sock %d", sock->fd);
  55                 goto end;
  56         }
  57
  58         if (reply.ret_code == LTTNG_OK) {
  59                 /* All good. */
  60                 ret = 0;
  61         } else {
  62                 ret = -reply.ret_code;
  63                 DBG("Consumer ret code %d", ret);
  64         }
  65
  66 end:
  67         return ret;
  68 }
  69
  70 /*
  71  * Once the ASK_CHANNEL command is sent to the consumer, the channel
  72  * information are sent back. This call receives that data and populates key
  73  * and stream_count.
  74  *
  75  * On success return 0 and both key and stream_count are set. On error, a
  76  * negative value is sent back and both parameters are untouched.
  77  */
  78 int consumer_recv_status_channel(struct consumer_socket *sock,
  79                 unsigned long *key, unsigned int *stream_count)
  80 {
  81         int ret;
  82         struct lttcomm_consumer_status_channel reply;
  83
  84         assert(sock);
  85         assert(stream_count);
  86         assert(key);
  87
  88         ret = lttcomm_recv_unix_sock(sock->fd, &reply, sizeof(reply));
  89         if (ret <= 0) {
  90                 if (ret == 0) {
  91                         /* Orderly shutdown. Don't return 0 which means success. */
  92                         ret = -1;
  93                 }
  94                 /* The above call will print a PERROR on error. */
  95                 DBG("Fail to receive status reply on sock %d", sock->fd);
  96                 goto end;
  97         }
  98
  99         /* An error is possible so don't touch the key and stream_count. */
 100         if (reply.ret_code != LTTNG_OK) {
 101                 ret = -1;
 102                 goto end;
 103         }
 104
 105         *key = reply.key;
 106         *stream_count = reply.stream_count;
 107
 108 end:
 109         return ret;
 110 }
 111
 112 /*
 113  * Send destroy relayd command to consumer.
 114  *
 115  * On success return positive value. On error, negative value.
 116  */
 117 int consumer_send_destroy_relayd(struct consumer_socket *sock,
 118                 struct consumer_output *consumer)
 119 {
 120         int ret;
 121         struct lttcomm_consumer_msg msg;
 122
 123         assert(consumer);
 124         assert(sock);
 125
 126         DBG2("Sending destroy relayd command to consumer sock %d", sock->fd);
 127
 128         /* Bail out if consumer is disabled */
 129         if (!consumer->enabled) {
 130                 ret = LTTNG_OK;
 131                 DBG3("Consumer is disabled");
 132                 goto error;
 133         }
 134
 135         msg.cmd_type = LTTNG_CONSUMER_DESTROY_RELAYD;
 136         msg.u.destroy_relayd.net_seq_idx = consumer->net_seq_index;
 137
 138         pthread_mutex_lock(sock->lock);
 139         ret = lttcomm_send_unix_sock(sock->fd, &msg, sizeof(msg));
 140         if (ret < 0) {
 141                 /* Indicate that the consumer is probably closing at this point. */
 142                 DBG("send consumer destroy relayd command");
 143                 goto error_send;
 144         }
 145
 146         /* Don't check the return value. The caller will do it. */
 147         ret = consumer_recv_status_reply(sock);
 148
 149         DBG2("Consumer send destroy relayd command done");
 150
 151 error_send:
 152         pthread_mutex_unlock(sock->lock);
 153 error:
 154         return ret;
 155 }
 156
 157 /*
 158  * For each consumer socket in the consumer output object, send a destroy
 159  * relayd command.
 160  */
 161 void consumer_output_send_destroy_relayd(struct consumer_output *consumer)
 162 {
 163         struct lttng_ht_iter iter;
 164         struct consumer_socket *socket;
 165
 166         assert(consumer);
 167
 168         /* Destroy any relayd connection */
 169         if (consumer && consumer->type == CONSUMER_DST_NET) {
 170                 rcu_read_lock();
 171                 cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
 172                                 node.node) {
 173                         int ret;
 174
 175                         /* Send destroy relayd command */
 176                         ret = consumer_send_destroy_relayd(socket, consumer);
 177                         if (ret < 0) {
 178                                 DBG("Unable to send destroy relayd command to consumer");
 179                                 /* Continue since we MUST delete everything at this point. */
 180                         }
 181                 }
 182                 rcu_read_unlock();
 183         }
 184 }
 185
 186 /*
 187  * From a consumer_data structure, allocate and add a consumer socket to the
 188  * consumer output.
 189  *
 190  * Return 0 on success, else negative value on error
 191  */
 192 int consumer_create_socket(struct consumer_data *data,
 193                 struct consumer_output *output)
 194 {
 195         int ret = 0;
 196         struct consumer_socket *socket;
 197
 198         assert(data);
 199
 200         if (output == NULL || data->cmd_sock < 0) {
 201                 /*
 202                  * Not an error. Possible there is simply not spawned consumer or it's
 203                  * disabled for the tracing session asking the socket.
 204                  */
 205                 goto error;
 206         }
 207
 208         rcu_read_lock();
 209         socket = consumer_find_socket(data->cmd_sock, output);
 210         rcu_read_unlock();
 211         if (socket == NULL) {
 212                 socket = consumer_allocate_socket(data->cmd_sock);
 213                 if (socket == NULL) {
 214                         ret = -1;
 215                         goto error;
 216                 }
 217
 218                 socket->registered = 0;
 219                 socket->lock = &data->lock;
 220                 rcu_read_lock();
 221                 consumer_add_socket(socket, output);
 222                 rcu_read_unlock();
 223         }
 224
 225         DBG3("Consumer socket created (fd: %d) and added to output",
 226                         data->cmd_sock);
 227
 228 error:
 229         return ret;
 230 }
 231
 232 /*
 233  * Find a consumer_socket in a consumer_output hashtable. Read side lock must
 234  * be acquired before calling this function and across use of the
 235  * returned consumer_socket.
 236  */
 237 struct consumer_socket *consumer_find_socket(int key,
 238                 struct consumer_output *consumer)
 239 {
 240         struct lttng_ht_iter iter;
 241         struct lttng_ht_node_ulong *node;
 242         struct consumer_socket *socket = NULL;
 243
 244         /* Negative keys are lookup failures */
 245         if (key < 0 || consumer == NULL) {
 246                 return NULL;
 247         }
 248
 249         lttng_ht_lookup(consumer->socks, (void *)((unsigned long) key),
 250                         &iter);
 251         node = lttng_ht_iter_get_node_ulong(&iter);
 252         if (node != NULL) {
 253                 socket = caa_container_of(node, struct consumer_socket, node);
 254         }
 255
 256         return socket;
 257 }
 258
 259 /*
 260  * Allocate a new consumer_socket and return the pointer.
 261  */
 262 struct consumer_socket *consumer_allocate_socket(int fd)
 263 {
 264         struct consumer_socket *socket = NULL;
 265
 266         socket = zmalloc(sizeof(struct consumer_socket));
 267         if (socket == NULL) {
 268                 PERROR("zmalloc consumer socket");
 269                 goto error;
 270         }
 271
 272         socket->fd = fd;
 273         lttng_ht_node_init_ulong(&socket->node, fd);
 274
 275 error:
 276         return socket;
 277 }
 278
 279 /*
 280  * Add consumer socket to consumer output object. Read side lock must be
 281  * acquired before calling this function.
 282  */
 283 void consumer_add_socket(struct consumer_socket *sock,
 284                 struct consumer_output *consumer)
 285 {
 286         assert(sock);
 287         assert(consumer);
 288
 289         lttng_ht_add_unique_ulong(consumer->socks, &sock->node);
 290 }
 291
 292 /*
 293  * Delte consumer socket to consumer output object. Read side lock must be
 294  * acquired before calling this function.
 295  */
 296 void consumer_del_socket(struct consumer_socket *sock,
 297                 struct consumer_output *consumer)
 298 {
 299         int ret;
 300         struct lttng_ht_iter iter;
 301
 302         assert(sock);
 303         assert(consumer);
 304
 305         iter.iter.node = &sock->node.node;
 306         ret = lttng_ht_del(consumer->socks, &iter);
 307         assert(!ret);
 308 }
 309
 310 /*
 311  * RCU destroy call function.
 312  */
 313 static void destroy_socket_rcu(struct rcu_head *head)
 314 {
 315         struct lttng_ht_node_ulong *node =
 316                 caa_container_of(head, struct lttng_ht_node_ulong, head);
 317         struct consumer_socket *socket =
 318                 caa_container_of(node, struct consumer_socket, node);
 319
 320         free(socket);
 321 }
 322
 323 /*
 324  * Destroy and free socket pointer in a call RCU. Read side lock must be
 325  * acquired before calling this function.
 326  */
 327 void consumer_destroy_socket(struct consumer_socket *sock)
 328 {
 329         assert(sock);
 330
 331         /*
 332          * We DO NOT close the file descriptor here since it is global to the
 333          * session daemon and is closed only if the consumer dies or a custom
 334          * consumer was registered,
 335          */
 336         if (sock->registered) {
 337                 DBG3("Consumer socket was registered. Closing fd %d", sock->fd);
 338                 lttcomm_close_unix_sock(sock->fd);
 339         }
 340
 341         call_rcu(&sock->node.head, destroy_socket_rcu);
 342 }
 343
 344 /*
 345  * Allocate and assign data to a consumer_output object.
 346  *
 347  * Return pointer to structure.
 348  */
 349 struct consumer_output *consumer_create_output(enum consumer_dst_type type)
 350 {
 351         struct consumer_output *output = NULL;
 352
 353         output = zmalloc(sizeof(struct consumer_output));
 354         if (output == NULL) {
 355                 PERROR("zmalloc consumer_output");
 356                 goto error;
 357         }
 358
 359         /* By default, consumer output is enabled */
 360         output->enabled = 1;
 361         output->type = type;
 362         output->net_seq_index = -1;
 363
 364         output->socks = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 365
 366 error:
 367         return output;
 368 }
 369
 370 /*
 371  * Delete the consumer_output object from the list and free the ptr.
 372  */
 373 void consumer_destroy_output(struct consumer_output *obj)
 374 {
 375         if (obj == NULL) {
 376                 return;
 377         }
 378
 379         if (obj->socks) {
 380                 struct lttng_ht_iter iter;
 381                 struct consumer_socket *socket;
 382
 383                 rcu_read_lock();
 384                 cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
 385                         consumer_del_socket(socket, obj);
 386                         consumer_destroy_socket(socket);
 387                 }
 388                 rcu_read_unlock();
 389
 390                 /* Finally destroy HT */
 391                 lttng_ht_destroy(obj->socks);
 392         }
 393
 394         free(obj);
 395 }
 396
 397 /*
 398  * Copy consumer output and returned the newly allocated copy.
 399  */
 400 struct consumer_output *consumer_copy_output(struct consumer_output *obj)
 401 {
 402         struct lttng_ht *tmp_ht_ptr;
 403         struct lttng_ht_iter iter;
 404         struct consumer_socket *socket, *copy_sock;
 405         struct consumer_output *output;
 406
 407         assert(obj);
 408
 409         output = consumer_create_output(obj->type);
 410         if (output == NULL) {
 411                 goto error;
 412         }
 413         /* Avoid losing the HT reference after the memcpy() */
 414         tmp_ht_ptr = output->socks;
 415
 416         memcpy(output, obj, sizeof(struct consumer_output));
 417
 418         /* Putting back the HT pointer and start copying socket(s). */
 419         output->socks = tmp_ht_ptr;
 420
 421         rcu_read_lock();
 422         cds_lfht_for_each_entry(obj->socks->ht, &iter.iter, socket, node.node) {
 423                 /* Create new socket object. */
 424                 copy_sock = consumer_allocate_socket(socket->fd);
 425                 if (copy_sock == NULL) {
 426                         rcu_read_unlock();
 427                         goto malloc_error;
 428                 }
 429
 430                 copy_sock->registered = socket->registered;
 431                 copy_sock->lock = socket->lock;
 432                 consumer_add_socket(copy_sock, output);
 433         }
 434         rcu_read_unlock();
 435
 436 error:
 437         return output;
 438
 439 malloc_error:
 440         consumer_destroy_output(output);
 441         return NULL;
 442 }
 443
 444 /*
 445  * Set network URI to the consumer output object.
 446  *
 447  * Return 0 on success. Return 1 if the URI were equal. Else, negative value on
 448  * error.
 449  */
 450 int consumer_set_network_uri(struct consumer_output *obj,
 451                 struct lttng_uri *uri)
 452 {
 453         int ret;
 454         char tmp_path[PATH_MAX];
 455         char hostname[HOST_NAME_MAX];
 456         struct lttng_uri *dst_uri = NULL;
 457
 458         /* Code flow error safety net. */
 459         assert(obj);
 460         assert(uri);
 461
 462         switch (uri->stype) {
 463         case LTTNG_STREAM_CONTROL:
 464                 dst_uri = &obj->dst.net.control;
 465                 obj->dst.net.control_isset = 1;
 466                 if (uri->port == 0) {
 467                         /* Assign default port. */
 468                         uri->port = DEFAULT_NETWORK_CONTROL_PORT;
 469                 }
 470                 DBG3("Consumer control URI set with port %d", uri->port);
 471                 break;
 472         case LTTNG_STREAM_DATA:
 473                 dst_uri = &obj->dst.net.data;
 474                 obj->dst.net.data_isset = 1;
 475                 if (uri->port == 0) {
 476                         /* Assign default port. */
 477                         uri->port = DEFAULT_NETWORK_DATA_PORT;
 478                 }
 479                 DBG3("Consumer data URI set with port %d", uri->port);
 480                 break;
 481         default:
 482                 ERR("Set network uri type unknown %d", uri->stype);
 483                 goto error;
 484         }
 485
 486         ret = uri_compare(dst_uri, uri);
 487         if (!ret) {
 488                 /* Same URI, don't touch it and return success. */
 489                 DBG3("URI network compare are the same");
 490                 goto equal;
 491         }
 492
 493         /* URIs were not equal, replacing it. */
 494         memset(dst_uri, 0, sizeof(struct lttng_uri));
 495         memcpy(dst_uri, uri, sizeof(struct lttng_uri));
 496         obj->type = CONSUMER_DST_NET;
 497
 498         /* Handle subdir and add hostname in front. */
 499         if (dst_uri->stype == LTTNG_STREAM_CONTROL) {
 500                 /* Get hostname to append it in the pathname */
 501                 ret = gethostname(hostname, sizeof(hostname));
 502                 if (ret < 0) {
 503                         PERROR("gethostname. Fallback on default localhost");
 504                         strncpy(hostname, "localhost", sizeof(hostname));
 505                 }
 506                 hostname[sizeof(hostname) - 1] = '\0';
 507
 508                 /* Setup consumer subdir if none present in the control URI */
 509                 if (strlen(dst_uri->subdir) == 0) {
 510                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 511                                         hostname, obj->subdir);
 512                 } else {
 513                         ret = snprintf(tmp_path, sizeof(tmp_path), "%s/%s",
 514                                         hostname, dst_uri->subdir);
 515                 }
 516                 if (ret < 0) {
 517                         PERROR("snprintf set consumer uri subdir");
 518                         goto error;
 519                 }
 520
 521                 strncpy(obj->subdir, tmp_path, sizeof(obj->subdir));
 522                 DBG3("Consumer set network uri subdir path %s", tmp_path);
 523         }
 524
 525         return 0;
 526 equal:
 527         return 1;
 528 error:
 529         return -1;
 530 }
 531
 532 /*
 533  * Send file descriptor to consumer via sock.
 534  */
 535 int consumer_send_fds(struct consumer_socket *sock, int *fds, size_t nb_fd)
 536 {
 537         int ret;
 538
 539         assert(fds);
 540         assert(sock);
 541         assert(nb_fd > 0);
 542
 543         ret = lttcomm_send_fds_unix_sock(sock->fd, fds, nb_fd);
 544         if (ret < 0) {
 545                 /* The above call will print a PERROR on error. */
 546                 DBG("Error when sending consumer fds on sock %d", sock->fd);
 547                 goto error;
 548         }
 549
 550         ret = consumer_recv_status_reply(sock);
 551
 552 error:
 553         return ret;
 554 }
 555
 556 /*
 557  * Consumer send communication message structure to consumer.
 558  */
 559 int consumer_send_msg(struct consumer_socket *sock,
 560                 struct lttcomm_consumer_msg *msg)
 561 {
 562         int ret;
 563
 564         assert(msg);
 565         assert(sock);
 566         assert(sock->fd >= 0);
 567
 568         ret = lttcomm_send_unix_sock(sock->fd, msg,
 569                         sizeof(struct lttcomm_consumer_msg));
 570         if (ret < 0) {
 571                 /* The above call will print a PERROR on error. */
 572                 DBG("Error when sending consumer channel on sock %d", sock->fd);
 573                 goto error;
 574         }
 575
 576         ret = consumer_recv_status_reply(sock);
 577
 578 error:
 579         return ret;
 580 }
 581
 582 /*
 583  * Consumer send channel communication message structure to consumer.
 584  */
 585 int consumer_send_channel(struct consumer_socket *sock,
 586                 struct lttcomm_consumer_msg *msg)
 587 {
 588         int ret;
 589
 590         assert(msg);
 591         assert(sock);
 592         assert(sock->fd >= 0);
 593
 594         ret = lttcomm_send_unix_sock(sock->fd, msg,
 595                         sizeof(struct lttcomm_consumer_msg));
 596         if (ret < 0) {
 597                 /* The above call will print a PERROR on error. */
 598                 DBG("Error when sending consumer channel on sock %d", sock->fd);
 599                 goto error;
 600         }
 601
 602         ret = consumer_recv_status_reply(sock);
 603
 604 error:
 605         return ret;
 606 }
 607
 608 /*
 609  * Populate the given consumer msg structure with the ask_channel command
 610  * information.
 611  */
 612 void consumer_init_ask_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 613                 uint64_t subbuf_size,
 614                 uint64_t num_subbuf,
 615                 int overwrite,
 616                 unsigned int switch_timer_interval,
 617                 unsigned int read_timer_interval,
 618                 int output,
 619                 int type,
 620                 uint64_t session_id,
 621                 const char *pathname,
 622                 const char *name,
 623                 uid_t uid,
 624                 gid_t gid,
 625                 int relayd_id,
 626                 unsigned long key,
 627                 unsigned char *uuid)
 628 {
 629         assert(msg);
 630
 631         /* Zeroed structure */
 632         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 633
 634         msg->cmd_type = LTTNG_CONSUMER_ASK_CHANNEL_CREATION;
 635         msg->u.ask_channel.subbuf_size = subbuf_size;
 636         msg->u.ask_channel.num_subbuf = num_subbuf ;
 637         msg->u.ask_channel.overwrite = overwrite;
 638         msg->u.ask_channel.switch_timer_interval = switch_timer_interval;
 639         msg->u.ask_channel.read_timer_interval = read_timer_interval;
 640         msg->u.ask_channel.output = output;
 641         msg->u.ask_channel.type = type;
 642         msg->u.ask_channel.session_id = session_id;
 643         msg->u.ask_channel.uid = uid;
 644         msg->u.ask_channel.gid = gid;
 645         msg->u.ask_channel.relayd_id = relayd_id;
 646         msg->u.ask_channel.key = key;
 647
 648         memcpy(msg->u.ask_channel.uuid, uuid, sizeof(msg->u.ask_channel.uuid));
 649
 650         strncpy(msg->u.ask_channel.pathname, pathname,
 651                         sizeof(msg->u.ask_channel.pathname));
 652         msg->u.ask_channel.pathname[sizeof(msg->u.ask_channel.pathname)-1] = '\0';
 653
 654         strncpy(msg->u.ask_channel.name, name, sizeof(msg->u.ask_channel.name));
 655         msg->u.ask_channel.name[sizeof(msg->u.ask_channel.name) - 1] = '\0';
 656 }
 657
 658 /*
 659  * Init channel communication message structure.
 660  */
 661 void consumer_init_channel_comm_msg(struct lttcomm_consumer_msg *msg,
 662                 enum lttng_consumer_command cmd,
 663                 int channel_key,
 664                 uint64_t session_id,
 665                 const char *pathname,
 666                 uid_t uid,
 667                 gid_t gid,
 668                 int relayd_id,
 669                 const char *name,
 670                 unsigned int nb_init_streams,
 671                 enum lttng_event_output output,
 672                 int type)
 673 {
 674         assert(msg);
 675
 676         /* Zeroed structure */
 677         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 678
 679         /* Send channel */
 680         msg->cmd_type = cmd;
 681         msg->u.channel.channel_key = channel_key;
 682         msg->u.channel.session_id = session_id;
 683         msg->u.channel.uid = uid;
 684         msg->u.channel.gid = gid;
 685         msg->u.channel.relayd_id = relayd_id;
 686         msg->u.channel.nb_init_streams = nb_init_streams;
 687         msg->u.channel.output = output;
 688         msg->u.channel.type = type;
 689
 690         strncpy(msg->u.channel.pathname, pathname,
 691                         sizeof(msg->u.channel.pathname));
 692         msg->u.channel.pathname[sizeof(msg->u.channel.pathname) - 1] = '\0';
 693
 694         strncpy(msg->u.channel.name, name, sizeof(msg->u.channel.name));
 695         msg->u.channel.name[sizeof(msg->u.channel.name) - 1] = '\0';
 696 }
 697
 698 /*
 699  * Init stream communication message structure.
 700  */
 701 void consumer_init_stream_comm_msg(struct lttcomm_consumer_msg *msg,
 702                 enum lttng_consumer_command cmd,
 703                 int channel_key,
 704                 int stream_key,
 705                 int cpu)
 706 {
 707         assert(msg);
 708
 709         memset(msg, 0, sizeof(struct lttcomm_consumer_msg));
 710
 711         msg->cmd_type = cmd;
 712         msg->u.stream.channel_key = channel_key;
 713         msg->u.stream.stream_key = stream_key;
 714         msg->u.stream.cpu = cpu;
 715 }
 716
 717 /*
 718  * Send stream communication structure to the consumer.
 719  */
 720 int consumer_send_stream(struct consumer_socket *sock,
 721                 struct consumer_output *dst, struct lttcomm_consumer_msg *msg,
 722                 int *fds, size_t nb_fd)
 723 {
 724         int ret;
 725
 726         assert(msg);
 727         assert(dst);
 728         assert(sock);
 729         assert(fds);
 730
 731         /* Send on socket */
 732         ret = lttcomm_send_unix_sock(sock->fd, msg,
 733                         sizeof(struct lttcomm_consumer_msg));
 734         if (ret < 0) {
 735                 /* The above call will print a PERROR on error. */
 736                 DBG("Error when sending consumer stream on sock %d", sock->fd);
 737                 goto error;
 738         }
 739
 740         ret = consumer_recv_status_reply(sock);
 741         if (ret < 0) {
 742                 goto error;
 743         }
 744
 745         ret = consumer_send_fds(sock, fds, nb_fd);
 746         if (ret < 0) {
 747                 goto error;
 748         }
 749
 750 error:
 751         return ret;
 752 }
 753
 754 /*
 755  * Send relayd socket to consumer associated with a session name.
 756  *
 757  * On success return positive value. On error, negative value.
 758  */
 759 int consumer_send_relayd_socket(struct consumer_socket *consumer_sock,
 760                 struct lttcomm_sock *sock, struct consumer_output *consumer,
 761                 enum lttng_stream_type type, unsigned int session_id)
 762 {
 763         int ret;
 764         struct lttcomm_consumer_msg msg;
 765
 766         /* Code flow error. Safety net. */
 767         assert(sock);
 768         assert(consumer);
 769         assert(consumer_sock);
 770
 771         /* Bail out if consumer is disabled */
 772         if (!consumer->enabled) {
 773                 ret = LTTNG_OK;
 774                 goto error;
 775         }
 776
 777         msg.cmd_type = LTTNG_CONSUMER_ADD_RELAYD_SOCKET;
 778         /*
 779          * Assign network consumer output index using the temporary consumer since
 780          * this call should only be made from within a set_consumer_uri() function
 781          * call in the session daemon.
 782          */
 783         msg.u.relayd_sock.net_index = consumer->net_seq_index;
 784         msg.u.relayd_sock.type = type;
 785         msg.u.relayd_sock.session_id = session_id;
 786         memcpy(&msg.u.relayd_sock.sock, sock, sizeof(msg.u.relayd_sock.sock));
 787
 788         DBG3("Sending relayd sock info to consumer on %d", consumer_sock->fd);
 789         ret = lttcomm_send_unix_sock(consumer_sock->fd, &msg, sizeof(msg));
 790         if (ret < 0) {
 791                 /* The above call will print a PERROR on error. */
 792                 DBG("Error when sending relayd sockets on sock %d", sock->fd);
 793                 goto error;
 794         }
 795
 796         ret = consumer_recv_status_reply(consumer_sock);
 797         if (ret < 0) {
 798                 goto error;
 799         }
 800
 801         DBG3("Sending relayd socket file descriptor to consumer");
 802         ret = consumer_send_fds(consumer_sock, &sock->fd, 1);
 803         if (ret < 0) {
 804                 goto error;
 805         }
 806
 807         DBG2("Consumer relayd socket sent");
 808
 809 error:
 810         return ret;
 811 }
 812
 813 /*
 814  * Set consumer subdirectory using the session name and a generated datetime if
 815  * needed. This is appended to the current subdirectory.
 816  */
 817 int consumer_set_subdir(struct consumer_output *consumer,
 818                 const char *session_name)
 819 {
 820         int ret = 0;
 821         unsigned int have_default_name = 0;
 822         char datetime[16], tmp_path[PATH_MAX];
 823         time_t rawtime;
 824         struct tm *timeinfo;
 825
 826         assert(consumer);
 827         assert(session_name);
 828
 829         memset(tmp_path, 0, sizeof(tmp_path));
 830
 831         /* Flag if we have a default session. */
 832         if (strncmp(session_name, DEFAULT_SESSION_NAME "-",
 833                                 strlen(DEFAULT_SESSION_NAME) + 1) == 0) {
 834                 have_default_name = 1;
 835         } else {
 836                 /* Get date and time for session path */
 837                 time(&rawtime);
 838                 timeinfo = localtime(&rawtime);
 839                 strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
 840         }
 841
 842         if (have_default_name) {
 843                 ret = snprintf(tmp_path, sizeof(tmp_path),
 844                                 "%s/%s", consumer->subdir, session_name);
 845         } else {
 846                 ret = snprintf(tmp_path, sizeof(tmp_path),
 847                                 "%s/%s-%s/", consumer->subdir, session_name, datetime);
 848         }
 849         if (ret < 0) {
 850                 PERROR("snprintf session name date");
 851                 goto error;
 852         }
 853
 854         strncpy(consumer->subdir, tmp_path, sizeof(consumer->subdir));
 855         DBG2("Consumer subdir set to %s", consumer->subdir);
 856
 857 error:
 858         return ret;
 859 }
 860
 861 /*
 862  * Ask the consumer if the data is ready to read (NOT pending) for the specific
 863  * session id.
 864  *
 865  * This function has a different behavior with the consumer i.e. that it waits
 866  * for a reply from the consumer if yes or no the data is pending.
 867  */
 868 int consumer_is_data_pending(unsigned int id,
 869                 struct consumer_output *consumer)
 870 {
 871         int ret;
 872         int32_t ret_code = 0;  /* Default is that the data is NOT pending */
 873         struct consumer_socket *socket;
 874         struct lttng_ht_iter iter;
 875         struct lttcomm_consumer_msg msg;
 876
 877         assert(consumer);
 878
 879         msg.cmd_type = LTTNG_CONSUMER_DATA_PENDING;
 880
 881         msg.u.data_pending.session_id = (uint64_t) id;
 882
 883         DBG3("Consumer data pending for id %u", id);
 884
 885         /* Send command for each consumer */
 886         rcu_read_lock();
 887         cds_lfht_for_each_entry(consumer->socks->ht, &iter.iter, socket,
 888                         node.node) {
 889                 /* Code flow error */
 890                 assert(socket->fd >= 0);
 891
 892                 pthread_mutex_lock(socket->lock);
 893
 894                 ret = lttcomm_send_unix_sock(socket->fd, &msg, sizeof(msg));
 895                 if (ret < 0) {
 896                         /* The above call will print a PERROR on error. */
 897                         DBG("Error on consumer is data pending on sock %d", socket->fd);
 898                         pthread_mutex_unlock(socket->lock);
 899                         goto error_unlock;
 900                 }
 901
 902                 /*
 903                  * No need for a recv reply status because the answer to the command is
 904                  * the reply status message.
 905                  */
 906
 907                 ret = lttcomm_recv_unix_sock(socket->fd, &ret_code, sizeof(ret_code));
 908                 if (ret <= 0) {
 909                         if (ret == 0) {
 910                                 /* Orderly shutdown. Don't return 0 which means success. */
 911                                 ret = -1;
 912                         }
 913                         /* The above call will print a PERROR on error. */
 914                         DBG("Error on recv consumer is data pending on sock %d", socket->fd);
 915                         pthread_mutex_unlock(socket->lock);
 916                         goto error_unlock;
 917                 }
 918
 919                 pthread_mutex_unlock(socket->lock);
 920
 921                 if (ret_code == 1) {
 922                         break;
 923                 }
 924         }
 925         rcu_read_unlock();
 926
 927         DBG("Consumer data is %s pending for session id %u",
 928                         ret_code == 1 ? "" : "NOT", id);
 929         return ret_code;
 930
 931 error_unlock:
 932         rcu_read_unlock();
 933         return -1;
 934 }