ltt-sessiond/ltt-sessiond.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version 2
   7  * of the License, or (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <fcntl.h>
  21 #include <getopt.h>
  22 #include <grp.h>
  23 #include <limits.h>
  24 #include <pthread.h>
  25 #include <signal.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <sys/ipc.h>
  30 #include <sys/shm.h>
  31 #include <sys/socket.h>
  32 #include <sys/stat.h>
  33 #include <sys/types.h>
  34 #include <unistd.h>
  35
  36 #include <urcu/list.h>          /* URCU list library (-lurcu) */
  37 #include <ust/ustctl.h>         /* UST control lib (-lust) */
  38
  39 #include "liblttsessiondcomm.h"
  40 #include "ltt-sessiond.h"
  41
  42 const char default_home_dir[] = DEFAULT_HOME_DIR;
  43 const char default_tracing_group[] = DEFAULT_TRACING_GROUP;
  44 const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR;
  45 const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE;
  46
  47 /* Static functions */
  48 static int set_signal_handler(void);
  49 static int set_socket_perms(void);
  50 static void sighandler(int);
  51 static void daemonize(void);
  52 static void cleanup(void);
  53 static int check_existing_daemon(void);
  54 static int notify_apps(const char*);
  55 static int connect_app(pid_t);
  56 static int init_daemon_socket(void);
  57 static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg*);
  58
  59 static void *thread_manage_clients(void *);
  60 static void *thread_manage_apps(void *);
  61
  62 static int create_session(const char*, uuid_t *);
  63 static void destroy_session(uuid_t);
  64
  65 static struct ltt_session *find_session(uuid_t);
  66
  67 /* Variables */
  68 const char *progname;
  69 const char *opt_tracing_group;
  70 static int opt_daemon;
  71 static int is_root;                     /* Set to 1 if the daemon is running as root */
  72
  73 static char apps_unix_sock_path[PATH_MAX];                      /* Global application Unix socket path */
  74 static char client_unix_sock_path[PATH_MAX];            /* Global client Unix socket path */
  75
  76 static int client_socket;
  77 static int apps_socket;
  78
  79 static struct ltt_session *current_session;
  80 static int session_count;
  81
  82 /* Init session's list */
  83 static struct ltt_session_list ltt_session_list = {
  84         .head = CDS_LIST_HEAD_INIT(ltt_session_list.head),
  85 };
  86
  87 static struct ltt_traceable_app_list ltt_traceable_app_list = {
  88         .head = CDS_LIST_HEAD_INIT(ltt_traceable_app_list.head),
  89 };
  90
  91 /*
  92  *      thread_manage_apps
  93  *
  94  *      This thread manage the application socket communication
  95  */
  96 static void *thread_manage_apps(void *data)
  97 {
  98         int sock, ret;
  99         struct ltt_traceable_app *lta;
 100
 101         /* TODO: Something more elegant is needed but fine for now */
 102         struct {
 103                 int reg;        /* 1:register, 0:unregister */
 104                 pid_t pid;
 105                 uid_t uid;
 106         } reg_msg;
 107
 108         /* Notify all applications to register */
 109         notify_apps(default_global_apps_pipe);
 110
 111         ret = lttcomm_listen_unix_sock(apps_socket);
 112         if (ret < 0) {
 113                 goto error;
 114         }
 115
 116         while (1) {
 117                 /* Blocking call, waiting for transmission */
 118                 sock = lttcomm_accept_unix_sock(apps_socket);
 119                 if (sock < 0) {
 120                         goto error;
 121                 }
 122
 123                 /* Basic recv here to handle the very simple data
 124                  * that the libust send to register (reg_msg).
 125                  */
 126                 ret = recv(sock, &reg_msg, sizeof(reg_msg), 0);
 127                 if (ret < 0) {
 128                         perror("recv");
 129                         continue;
 130                 }
 131
 132                 /* Add application to the global traceable list */
 133                 if (reg_msg.reg == 1) {
 134                         /* Registering */
 135                         lta = malloc(sizeof(struct ltt_traceable_app));
 136                         lta->pid = reg_msg.pid;
 137                         lta->uid = reg_msg.uid;
 138                         cds_list_add(&lta->list, &ltt_traceable_app_list.head);
 139                 } else {
 140                         /* Unregistering */
 141                         lta = NULL;
 142                         cds_list_for_each_entry(lta, &ltt_traceable_app_list.head, list) {
 143                                 if (lta->pid == reg_msg.pid && lta->uid == reg_msg.uid) {
 144                                         cds_list_del(&lta->list);
 145                                         break;
 146                                 }
 147                         }
 148
 149                         /* If an item was found, free it from memory */
 150                         if (lta) {
 151                                 free(lta);
 152                         }
 153                 }
 154         }
 155
 156 error:
 157
 158         return NULL;
 159 }
 160
 161 /*
 162  *      thread_manage_clients
 163  *
 164  *      This thread manage all clients request using the unix
 165  *      client socket for communication.
 166  */
 167 static void *thread_manage_clients(void *data)
 168 {
 169         int sock, ret;
 170         struct lttcomm_session_msg lsm;
 171         struct lttcomm_lttng_msg *llm;
 172
 173         ret = lttcomm_listen_unix_sock(client_socket);
 174         if (ret < 0) {
 175                 goto error;
 176         }
 177
 178         while (1) {
 179                 /* Blocking call, waiting for transmission */
 180                 sock = lttcomm_accept_unix_sock(client_socket);
 181                 if (sock < 0) {
 182                         goto error;
 183                 }
 184
 185                 /*
 186                  * Data is received from the lttng client. The struct
 187                  * lttcomm_session_msg (lsm) contains the command and data
 188                  * request of the client.
 189                  */
 190                 ret = lttcomm_recv_unix_sock(sock, &lsm, sizeof(lsm));
 191                 if (ret < 0) {
 192                         continue;
 193                 }
 194
 195                 /* This function dispatch the work to the LTTng or UST libs
 196                  * and make sure that the reply structure (llm) is filled.
 197                  */
 198                 llm = process_client_msg(&lsm);
 199
 200                 /* Having a valid lttcomm_lttng_msg struct, reply is sent back
 201                  * to the client directly.
 202                  */
 203                 if (llm != NULL) {
 204                         ret = lttcomm_send_unix_sock(sock, llm,
 205                                         sizeof(struct lttcomm_lttng_msg));
 206                         free(llm);
 207                         if (ret < 0) {
 208                                 continue;
 209                         }
 210                 } else {
 211                         /* The lttcomm_lttng_msg struct was not allocated
 212                          * correctly. Fatal error since the daemon is not able
 213                          * to respond. However, we still permit client connection.
 214                          *
 215                          * TODO: We should have a default llm that tells the client
 216                          * that the sessiond had a fatal error and thus the client could
 217                          * take action to restart ltt-sessiond or inform someone.
 218                          */
 219                 }
 220         }
 221
 222 error:
 223         return NULL;
 224 }
 225
 226 /*
 227  *      connect_app
 228  *
 229  *      Return a socket connected to the libust communication socket
 230  *      of the application identified by the pid.
 231  */
 232 static int connect_app(pid_t pid)
 233 {
 234         int sock;
 235
 236         sock = ustctl_connect_pid(pid);
 237         if (sock < 0) {
 238                 fprintf(stderr, "Fail connecting to the PID %d\n", pid);
 239         }
 240
 241         return sock;
 242 }
 243
 244 /*
 245  *      notify_apps
 246  *
 247  *  Notify apps by writing 42 to a named pipe using name.
 248  *      Every applications waiting for a ltt-sessiond will be notified
 249  *      and re-register automatically to the session daemon.
 250  *
 251  *      Return open or write error value.
 252  */
 253 static int notify_apps(const char *name)
 254 {
 255         int fd;
 256         int ret = -1;
 257
 258         /* Try opening the global pipe */
 259         fd = open(name, O_WRONLY);
 260         if (fd < 0) {
 261                 goto error;
 262         }
 263
 264         /* Notify by writing on the pipe */
 265         ret = write(fd, "42", 2);
 266         if (ret < 0) {
 267                 perror("write");
 268         }
 269
 270 error:
 271         return ret;
 272 }
 273
 274 /*
 275  *      find_session
 276  *
 277  *      Return a ltt_session structure ptr that matches the uuid.
 278  */
 279 static struct ltt_session *find_session(uuid_t session_id)
 280 {
 281         struct ltt_session *iter = NULL;
 282
 283         /* Sanity check for NULL session_id */
 284         if (uuid_is_null(session_id)) {
 285                 goto end;
 286         }
 287
 288         cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
 289                 if (uuid_compare(iter->uuid, session_id)) {
 290                         break;
 291                 }
 292         }
 293
 294 end:
 295         return iter;
 296 }
 297
 298 /*
 299  *      destroy_session
 300  *
 301  *  Delete session from the global session list
 302  *  and free the memory.
 303  */
 304 static void destroy_session(uuid_t session_id)
 305 {
 306         struct ltt_session *iter = NULL;
 307
 308         cds_list_for_each_entry(iter, &ltt_session_list.head, list) {
 309                 if (uuid_compare(iter->uuid, session_id)) {
 310                         cds_list_del(&iter->list);
 311                         break;
 312                 }
 313         }
 314
 315         if (iter) {
 316                 free(iter);
 317                 session_count--;
 318         }
 319 }
 320
 321 /*
 322  *      create_session
 323  *
 324  *      Create a brand new session,
 325  */
 326 static int create_session(const char *name, uuid_t *session_id)
 327 {
 328         struct ltt_session *new_session;
 329
 330         /* Allocate session data structure */
 331         new_session = malloc(sizeof(struct ltt_session));
 332         if (new_session == NULL) {
 333                 perror("malloc");
 334                 goto error;
 335         }
 336
 337         if (name != NULL) {
 338                 if (asprintf(&new_session->name, "%s", name) < 0) {
 339                         goto error;
 340                 }
 341         } else {
 342                 /* Generate session name based on the session count */
 343                 if (asprintf(&new_session->name, "%s%d", "auto", session_count) < 0) {
 344                         goto error;
 345                 }
 346         }
 347
 348         /* UUID generation */
 349         uuid_generate(new_session->uuid);
 350         uuid_copy(*session_id, new_session->uuid);
 351
 352         /* Set consumer (identifier) to 0. This means that there is
 353          * NO consumer attach to that session yet.
 354          */
 355         new_session->ust_consumer = 0;
 356         new_session->lttng_consumer = 0;
 357
 358         /* Init list */
 359         CDS_INIT_LIST_HEAD(&new_session->ust_traces);
 360         CDS_INIT_LIST_HEAD(&new_session->lttng_traces);
 361
 362         /* Add new session to the global session list */
 363         cds_list_add(&new_session->list, &ltt_session_list.head);
 364
 365         session_count++;
 366
 367         return 0;
 368
 369 error:
 370         return -1;
 371 }
 372
 373 /*
 374  *      ust_list_apps
 375  *
 376  *  List traceable user-space application and fill an
 377  *  array of pids.
 378  *
 379  *  Return size of the array.
 380  */
 381 static size_t ust_list_apps(pid_t *pids)
 382 {
 383         size_t size = 0;
 384         struct ltt_traceable_app *iter = NULL;
 385
 386         cds_list_for_each_entry(iter, &ltt_traceable_app_list.head, list) {
 387                 if (size >= MAX_APPS_PID) {
 388                         break;
 389                 }
 390
 391                 pids[size] = iter->pid;
 392                 size++;
 393         }
 394
 395         return size;
 396 }
 397
 398 /*
 399  *      process_client_msg
 400  *
 401  *      This takes the lttcomm_session_msg struct and process the command requested
 402  *      by the client. It then creates the reply by allocating a lttcomm_lttng_msg
 403  *      and fill it with the necessary information.
 404  *
 405  *      It's the caller responsability to free that structure when done with it.
 406  *
 407  *      Return pointer to lttcomm_lttng_msg allocated struct.
 408  */
 409 static struct lttcomm_lttng_msg *process_client_msg(struct lttcomm_session_msg *lsm)
 410 {
 411         struct lttcomm_lttng_msg *llm;
 412
 413         /* Allocate the reply message structure */
 414         llm = malloc(sizeof(struct lttcomm_lttng_msg));
 415         if (llm == NULL) {
 416                 perror("malloc");
 417                 goto end;
 418         }
 419
 420         /* Copy common data to identify the response
 421          * on the lttng client side.
 422          */
 423         llm->cmd_type = lsm->cmd_type;
 424         llm->pid = lsm->pid;
 425         if (!uuid_is_null(lsm->session_id)) {
 426                 uuid_copy(llm->session_id, lsm->session_id);
 427         }
 428         strncpy(llm->trace_name, lsm->trace_name, sizeof(llm->trace_name));
 429
 430         /* Default return code.
 431          * In a our world, everything is OK... right?
 432          */
 433         llm->ret_code = LTTCOMM_OK;
 434
 435         /* Process by command type */
 436         switch (lsm->cmd_type) {
 437                 case UST_LIST_APPS:
 438                 {
 439                         llm->u.list_apps.size = ust_list_apps(llm->u.list_apps.pids);
 440                         break;
 441                 }
 442                 default:
 443                         /* Undefined command */
 444                         llm->ret_code = LTTCOMM_UND;
 445                         break;
 446         }
 447
 448 end:
 449         return llm;
 450 }
 451
 452 /*
 453  * usage function on stderr
 454  */
 455 static void usage(void)
 456 {
 457         fprintf(stderr, "Usage:\n%s OPTIONS\n\nOptions:\n"
 458                         "\t-h, --help\t\tDisplay this usage.\n"
 459                         "\t-c, --client-sock PATH\t\tSpecify path for the client unix socket\n"
 460                         "\t-a, --apps-sock PATH\t\tSpecify path for apps unix socket.\n"
 461                         "\t-d, --daemonize\t\tStart as a daemon.\n"
 462                         "\t-g, --group NAME\t\tSpecify the tracing group name. (default: tracing)\n"
 463                         "\t-V, --version\t\tShow version number.\n",
 464                         progname);
 465 }
 466
 467 /*
 468  * daemon argument parsing
 469  */
 470 static int parse_args(int argc, char **argv)
 471 {
 472         int c;
 473
 474         static struct option long_options[] = {
 475                 { "client-sock", 1, 0, 'c' },
 476                 { "apps-sock", 1, 0, 'a' },
 477                 { "daemonize", 0, 0, 'd' },
 478                 { "help", 0, 0, 'h' },
 479                 { "group", 1, 0, 'g' },
 480                 { "version", 0, 0, 'V' },
 481                 { NULL, 0, 0, 0 }
 482         };
 483
 484         while (1) {
 485                 int option_index = 0;
 486                 c = getopt_long(argc, argv, "dhV" "a:c:g:s:", long_options, &option_index);
 487                 if (c == -1) {
 488                         break;
 489                 }
 490
 491                 switch (c) {
 492                 case 0:
 493                         fprintf(stderr, "option %s", long_options[option_index].name);
 494                         if (optarg) {
 495                                 fprintf(stderr, " with arg %s\n", optarg);
 496                         }
 497                         break;
 498                 case 's':
 499                         snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg);
 500                         break;
 501                 case 'a':
 502                         snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg);
 503                         break;
 504                 case 'd':
 505                         opt_daemon = 1;
 506                         break;
 507                 case 'g':
 508                         opt_tracing_group = strdup(optarg);
 509                         break;
 510                 case 'h':
 511                         usage();
 512                         exit(EXIT_FAILURE);
 513                 case 'V':
 514                         fprintf(stdout, "%s\n", VERSION);
 515                         exit(EXIT_SUCCESS);
 516                 default:
 517                         /* Unknown option or other error.
 518                          * Error is printed by getopt, just return */
 519                         return -1;
 520                 }
 521         }
 522
 523         return 0;
 524 }
 525
 526 /*
 527  *      init_daemon_socket
 528  *
 529  *      Creates the two needed socket by the daemon.
 530  *              apps_socket - The communication socket for all UST apps.
 531  *              client_socket - The communication of the cli tool (lttng).
 532  */
 533 static int init_daemon_socket()
 534 {
 535         int ret = 0;
 536         mode_t old_umask;
 537
 538         old_umask = umask(0);
 539
 540         /* Create client tool unix socket */
 541         client_socket = lttcomm_create_unix_sock(client_unix_sock_path);
 542         if (client_socket < 0) {
 543                 ret = -1;
 544                 goto end;
 545         }
 546
 547         /* File permission MUST be 660 */
 548         ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
 549         if (ret < 0) {
 550                 perror("chmod");
 551                 goto end;
 552         }
 553
 554         /* Create the application unix socket */
 555         apps_socket = lttcomm_create_unix_sock(apps_unix_sock_path);
 556         if (apps_socket < 0) {
 557                 ret = -1;
 558                 goto end;
 559         }
 560
 561         /* File permission MUST be 660 */
 562         ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
 563         if (ret < 0) {
 564                 perror("chmod");
 565                 goto end;
 566         }
 567
 568 end:
 569         umask(old_umask);
 570         return ret;
 571 }
 572
 573 /*
 574  *      check_existing_daemon
 575  *
 576  *      Check if the global socket is available.
 577  *      If yes, error is returned.
 578  */
 579 static int check_existing_daemon()
 580 {
 581         int ret;
 582
 583         ret = access(client_unix_sock_path, F_OK);
 584         if (ret == 0) {
 585                 ret = access(apps_unix_sock_path, F_OK);
 586         }
 587
 588         return ret;
 589 }
 590
 591 /*
 592  *      get_home_dir
 593  *
 594  *      Return pointer to home directory path using
 595  *      the env variable HOME.
 596  *
 597  *      Default : /tmp
 598  */
 599 static const char *get_home_dir(void)
 600 {
 601         const char *home_path;
 602
 603         if ((home_path = (const char *) getenv("HOME")) == NULL) {
 604                 home_path = default_home_dir;
 605         }
 606
 607         return home_path;
 608 }
 609
 610 /*
 611  *  set_socket_perms
 612  *
 613  *      Set the tracing group gid onto the client socket.
 614  */
 615 static int set_socket_perms(void)
 616 {
 617         int ret;
 618         struct group *grp;
 619
 620         /* Decide which group name to use */
 621         (opt_tracing_group != NULL) ?
 622                 (grp = getgrnam(opt_tracing_group)) :
 623                 (grp = getgrnam(default_tracing_group));
 624
 625         if (grp == NULL) {
 626                 fprintf(stderr, "Missing tracing group. Aborting execution.\n");
 627                 ret = -1;
 628                 goto end;
 629         }
 630
 631         ret = chown(client_unix_sock_path, 0, grp->gr_gid);
 632         if (ret < 0) {
 633                 perror("chown");
 634         }
 635
 636 end:
 637         return ret;
 638 }
 639
 640 /*
 641  *      daemonize
 642  *
 643  *      Daemonize ltt-sessiond.
 644  */
 645 static void daemonize(void)
 646 {
 647         pid_t pid, sid;
 648         const char *home_dir = get_home_dir();
 649
 650         /* Fork off the parent process */
 651         if ((pid = fork()) < 0) {
 652                 perror("fork");
 653                 exit(EXIT_FAILURE);
 654         }
 655
 656         /* Parent can now exit */
 657         if (pid > 0) {
 658                 exit(EXIT_SUCCESS);
 659         }
 660
 661         /* Change the file mode mask */
 662         umask(0);
 663
 664         /* Create a new SID for the child process */
 665         if ((sid = setsid()) < 0) {
 666                 perror("setsid");
 667                 exit(EXIT_FAILURE);
 668         }
 669
 670         /* Change the current working directory */
 671         if ((chdir(home_dir)) < 0) {
 672                 perror("chdir");
 673                 exit(EXIT_FAILURE);
 674         }
 675
 676         /* Close out the standard file descriptors */
 677         close(STDIN_FILENO);
 678         close(STDOUT_FILENO);
 679         close(STDERR_FILENO);
 680 }
 681
 682 /*
 683  *      set_signal_handler
 684  *
 685  *      Setup signal handler for :
 686  *              SIGINT, SIGTERM, SIGPIPE
 687  */
 688 static int set_signal_handler(void)
 689 {
 690         int ret = 0;
 691         struct sigaction sa;
 692         sigset_t sigset;
 693
 694         if ((ret = sigemptyset(&sigset)) < 0) {
 695                 perror("sigemptyset");
 696                 return ret;
 697         }
 698
 699         sa.sa_handler = sighandler;
 700         sa.sa_mask = sigset;
 701         sa.sa_flags = 0;
 702         if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
 703                 perror("sigaction");
 704                 return ret;
 705         }
 706
 707         if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
 708                 perror("sigaction");
 709                 return ret;
 710         }
 711
 712         if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
 713                 perror("sigaction");
 714                 return ret;
 715         }
 716
 717         return ret;
 718 }
 719
 720 /**
 721  *      sighandler
 722  *
 723  *      Signal handler for the daemon
 724  */
 725 static void sighandler(int sig)
 726 {
 727         switch (sig) {
 728                 case SIGPIPE:
 729                 case SIGINT:
 730                 case SIGTERM:
 731                         cleanup();
 732                         break;
 733                 default:
 734                         break;
 735         }
 736
 737         exit(EXIT_SUCCESS);
 738 }
 739
 740 /*
 741  *      cleanup
 742  *
 743  *      Cleanup the daemon on exit
 744  */
 745 static void cleanup()
 746 {
 747         /* <fun> */
 748         fprintf(stdout, "\n\n%c[%d;%dm*** assert failed *** ==> %c[%dm", 27,1,31,27,0);
 749         fprintf(stdout, "%c[%d;%dm Matthew, BEET driven development works!%c[%dm\n",27,1,33,27,0);
 750         /* </fun> */
 751
 752         unlink(client_unix_sock_path);
 753         unlink(apps_unix_sock_path);
 754 }
 755
 756 /*
 757  * main
 758  */
 759 int main(int argc, char **argv)
 760 {
 761         int i;
 762         int ret = 0;
 763         void *status;
 764         pthread_t threads[2];
 765
 766         /* Parse arguments */
 767         progname = argv[0];
 768         if ((ret = parse_args(argc, argv) < 0)) {
 769                 goto error;
 770         }
 771
 772         /* Daemonize */
 773         if (opt_daemon) {
 774                 daemonize();
 775         }
 776
 777         /* Check if daemon is UID = 0 */
 778         is_root = !getuid();
 779
 780         /* Set all sockets path */
 781         if (is_root) {
 782                 if (strlen(apps_unix_sock_path) == 0) {
 783                         (snprintf(apps_unix_sock_path, PATH_MAX,
 784                                         DEFAULT_GLOBAL_APPS_UNIX_SOCK));
 785                 }
 786
 787                 if (strlen(client_unix_sock_path) == 0) {
 788                         (snprintf(client_unix_sock_path, PATH_MAX,
 789                                         DEFAULT_GLOBAL_CLIENT_UNIX_SOCK));
 790                 }
 791         } else {
 792                 if (strlen(apps_unix_sock_path) == 0) {
 793                         (snprintf(apps_unix_sock_path, PATH_MAX,
 794                                         DEFAULT_HOME_APPS_UNIX_SOCK, get_home_dir()));
 795                 }
 796
 797                 /* Set the cli tool unix socket path */
 798                 if (strlen(client_unix_sock_path) == 0) {
 799                         (snprintf(client_unix_sock_path, PATH_MAX,
 800                                         DEFAULT_HOME_CLIENT_UNIX_SOCK, get_home_dir()));
 801                 }
 802         }
 803
 804         /* See if daemon already exist. If any of the two
 805          * socket needed by the daemon are present, this test fails
 806          */
 807         if ((ret = check_existing_daemon()) == 0) {
 808                 fprintf(stderr, "Already running daemon.\n");
 809                 goto error;
 810         }
 811
 812         if (set_signal_handler() < 0) {
 813                 goto error;
 814         }
 815
 816         /* Setup the two needed unix socket */
 817         if (init_daemon_socket() < 0) {
 818                 goto error;
 819         }
 820
 821         /* Set credentials to socket */
 822         if (is_root && (set_socket_perms() < 0)) {
 823                 goto error;
 824         }
 825
 826         while (1) {
 827                 /* Create thread to manage the client socket */
 828                 ret = pthread_create(&threads[0], NULL, thread_manage_clients, (void *) NULL);
 829                 if (ret != 0) {
 830                         perror("pthread_create");
 831                         goto error;
 832                 }
 833
 834                 /* Create thread to manage application socket */
 835                 ret = pthread_create(&threads[1], NULL, thread_manage_apps, (void *) NULL);
 836                 if (ret != 0) {
 837                         perror("pthread_create");
 838                         goto error;
 839                 }
 840
 841                 for (i = 0; i < 2; i++) {
 842                         ret = pthread_join(threads[i], &status);
 843                         if (ret != 0) {
 844                                 perror("pthread_join");
 845                                 goto error;
 846                         }
 847                 }
 848         }
 849
 850         cleanup();
 851         return 0;
 852
 853 error:
 854         cleanup();
 855
 856         return EXIT_FAILURE;
 857 }