source3/rpc_server/mdssd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *
   4  *  mds service daemon
   5  *
   6  *  Copyright (c) 2014      Ralph Boehme <rb@sernet.de>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "messages.h"
  24 #include "ntdomain.h"
  25
  26 #include "lib/id_cache.h"
  27
  28 #include "../lib/tsocket/tsocket.h"
  29 #include "lib/server_prefork.h"
  30 #include "lib/server_prefork_util.h"
  31 #include "librpc/rpc/dcerpc_ep.h"
  32 #include "librpc/rpc/dcesrv_core.h"
  33
  34 #include "rpc_server/rpc_server.h"
  35 #include "rpc_server/rpc_service_setup.h"
  36 #include "rpc_server/rpc_ep_register.h"
  37 #include "rpc_server/rpc_sock_helper.h"
  38 #include "rpc_server/rpc_modules.h"
  39
  40 #include "librpc/gen_ndr/srv_mdssvc.h"
  41 #include "rpc_server/mdssvc/srv_mdssvc_nt.h"
  42 #include "rpc_server/mdssd.h"
  43
  44 #undef DBGC_CLASS
  45 #define DBGC_CLASS DBGC_RPC_SRV
  46
  47 #define DAEMON_NAME "mdssd"
  48 #define MDSSD_MAX_SOCKETS 64
  49
  50 static struct server_id parent_id;
  51 static struct prefork_pool *mdssd_pool = NULL;
  52 static int mdssd_child_id = 0;
  53
  54 static struct pf_daemon_config default_pf_mdssd_cfg = {
  55         .prefork_status = PFH_INIT,
  56         .min_children = 5,
  57         .max_children = 25,
  58         .spawn_rate = 5,
  59         .max_allowed_clients = 1000,
  60         .child_min_life = 60 /* 1 minute minimum life time */
  61 };
  62 static struct pf_daemon_config pf_mdssd_cfg = { 0 };
  63
  64 static void mdssd_smb_conf_updated(struct messaging_context *msg,
  65                                    void *private_data,
  66                                    uint32_t msg_type,
  67                                    struct server_id server_id,
  68                                    DATA_BLOB *data)
  69 {
  70         struct tevent_context *ev_ctx;
  71
  72         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  73         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
  74
  75         change_to_root_user();
  76         lp_load_global(get_dyn_CONFIGFILE());
  77
  78         reopen_logs();
  79         if (mdssd_child_id == 0) {
  80                 pfh_daemon_config(DAEMON_NAME,
  81                                   &pf_mdssd_cfg,
  82                                   &default_pf_mdssd_cfg);
  83                 pfh_manage_pool(ev_ctx, msg, &pf_mdssd_cfg, mdssd_pool);
  84         }
  85 }
  86
  87 static void mdssd_sig_term_handler(struct tevent_context *ev,
  88                                    struct tevent_signal *se,
  89                                    int signum,
  90                                    int count,
  91                                    void *siginfo,
  92                                    void *private_data)
  93 {
  94         exit_server_cleanly("termination signal");
  95 }
  96
  97 static void mdssd_setup_sig_term_handler(struct tevent_context *ev_ctx)
  98 {
  99         struct tevent_signal *se;
 100
 101         se = tevent_add_signal(ev_ctx,
 102                                ev_ctx,
 103                                SIGTERM, 0,
 104                                mdssd_sig_term_handler,
 105                                NULL);
 106         if (!se) {
 107                 exit_server("failed to setup SIGTERM handler");
 108         }
 109 }
 110
 111 static void mdssd_sig_hup_handler(struct tevent_context *ev,
 112                                   struct tevent_signal *se,
 113                                   int signum,
 114                                   int count,
 115                                   void *siginfo,
 116                                   void *pvt)
 117 {
 118
 119         change_to_root_user();
 120         lp_load_global(get_dyn_CONFIGFILE());
 121
 122         reopen_logs();
 123         pfh_daemon_config(DAEMON_NAME,
 124                           &pf_mdssd_cfg,
 125                           &default_pf_mdssd_cfg);
 126
 127         /* relay to all children */
 128         prefork_send_signal_to_all(mdssd_pool, SIGHUP);
 129 }
 130
 131 static void mdssd_setup_sig_hup_handler(struct tevent_context *ev_ctx)
 132 {
 133         struct tevent_signal *se;
 134
 135         se = tevent_add_signal(ev_ctx,
 136                                ev_ctx,
 137                                SIGHUP, 0,
 138                                mdssd_sig_hup_handler,
 139                                NULL);
 140         if (!se) {
 141                 DEBUG(0, ("failed to setup SIGHUP handler\n"));
 142                 exit(1);
 143         }
 144 }
 145
 146 /**********************************************************
 147  * Children
 148  **********************************************************/
 149
 150 static void mdssd_chld_sig_hup_handler(struct tevent_context *ev,
 151                                        struct tevent_signal *se,
 152                                        int signum,
 153                                        int count,
 154                                        void *siginfo,
 155                                        void *pvt)
 156 {
 157         change_to_root_user();
 158         reopen_logs();
 159 }
 160
 161 static bool mdssd_setup_chld_hup_handler(struct tevent_context *ev_ctx)
 162 {
 163         struct tevent_signal *se;
 164
 165         se = tevent_add_signal(ev_ctx,
 166                                ev_ctx,
 167                                SIGHUP, 0,
 168                                mdssd_chld_sig_hup_handler,
 169                                NULL);
 170         if (!se) {
 171                 DEBUG(1, ("failed to setup SIGHUP handler"));
 172                 return false;
 173         }
 174
 175         return true;
 176 }
 177
 178 static void parent_ping(struct messaging_context *msg_ctx,
 179                         void *private_data,
 180                         uint32_t msg_type,
 181                         struct server_id server_id,
 182                         DATA_BLOB *data)
 183 {
 184         /*
 185          * The fact we received this message is enough to let make the
 186          * event loop if it was idle. mdssd_children_main will cycle
 187          * through mdssd_next_client at least once. That function will
 188          * take whatever action is necessary
 189          */
 190         DEBUG(10, ("Got message that the parent changed status.\n"));
 191         return;
 192 }
 193
 194 static bool mdssd_child_init(struct tevent_context *ev_ctx,
 195                              int child_id,
 196                              struct pf_worker_data *pf)
 197 {
 198         NTSTATUS status;
 199         struct messaging_context *msg_ctx = global_messaging_context();
 200         bool ok;
 201
 202         status = reinit_after_fork(msg_ctx, ev_ctx,
 203                                    true, "mdssd-child");
 204         if (!NT_STATUS_IS_OK(status)) {
 205                 DEBUG(0,("reinit_after_fork() failed\n"));
 206                 smb_panic("reinit_after_fork() failed");
 207         }
 208
 209         mdssd_child_id = child_id;
 210         reopen_logs();
 211
 212         ok = mdssd_setup_chld_hup_handler(ev_ctx);
 213         if (!ok) {
 214                 return false;
 215         }
 216
 217         messaging_register(msg_ctx, ev_ctx,
 218                            MSG_SMB_CONF_UPDATED, mdssd_smb_conf_updated);
 219         messaging_register(msg_ctx, ev_ctx,
 220                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 221
 222         return true;
 223 }
 224
 225 struct mdssd_children_data {
 226         struct tevent_context *ev_ctx;
 227         struct messaging_context *msg_ctx;
 228         struct dcesrv_context *dce_ctx;
 229         struct pf_worker_data *pf;
 230         int listen_fd_size;
 231         struct pf_listen_fd *listen_fds;
 232 };
 233
 234 static void mdssd_next_client(void *pvt);
 235
 236 static int mdssd_children_main(struct tevent_context *ev_ctx,
 237                                struct messaging_context *msg_ctx,
 238                                struct pf_worker_data *pf,
 239                                int child_id,
 240                                int listen_fd_size,
 241                                struct pf_listen_fd *listen_fds,
 242                                void *private_data)
 243 {
 244         struct mdssd_children_data *data;
 245         bool ok;
 246         int ret = 0;
 247         struct dcesrv_context *dce_ctx = NULL;
 248
 249         dce_ctx = talloc_get_type_abort(private_data, struct dcesrv_context);
 250
 251         ok = mdssd_child_init(ev_ctx, child_id, pf);
 252         if (!ok) {
 253                 return 1;
 254         }
 255
 256         data = talloc(ev_ctx, struct mdssd_children_data);
 257         if (!data) {
 258                 return 1;
 259         }
 260         data->pf = pf;
 261         data->ev_ctx = ev_ctx;
 262         data->msg_ctx = msg_ctx;
 263         data->dce_ctx = dce_ctx;
 264         data->listen_fd_size = listen_fd_size;
 265         data->listen_fds = listen_fds;
 266
 267         /* loop until it is time to exit */
 268         while (pf->status != PF_WORKER_EXITING) {
 269                 /* try to see if it is time to schedule the next client */
 270                 mdssd_next_client(data);
 271
 272                 ret = tevent_loop_once(ev_ctx);
 273                 if (ret != 0) {
 274                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 275                                   ret, strerror(errno)));
 276                         pf->status = PF_WORKER_EXITING;
 277                 }
 278         }
 279
 280         return ret;
 281 }
 282
 283 static void mdssd_client_terminated(struct dcesrv_connection *conn, void *pvt)
 284 {
 285         struct mdssd_children_data *data;
 286
 287         data = talloc_get_type_abort(pvt, struct mdssd_children_data);
 288
 289         pfh_client_terminated(data->pf);
 290
 291         mdssd_next_client(pvt);
 292 }
 293
 294 struct mdssd_new_client {
 295         struct mdssd_children_data *data;
 296 };
 297
 298 static void mdssd_handle_client(struct tevent_req *req);
 299
 300 static void mdssd_next_client(void *pvt)
 301 {
 302         struct tevent_req *req;
 303         struct mdssd_children_data *data;
 304         struct mdssd_new_client *next;
 305
 306         data = talloc_get_type_abort(pvt, struct mdssd_children_data);
 307
 308         if (!pfh_child_allowed_to_accept(data->pf)) {
 309                 /* nothing to do for now we are already listening
 310                  * or we are not allowed to listen further */
 311                 return;
 312         }
 313
 314         next = talloc_zero(data, struct mdssd_new_client);
 315         if (!next) {
 316                 DEBUG(1, ("Out of memory!?\n"));
 317                 return;
 318         }
 319         next->data = data;
 320
 321         req = prefork_listen_send(next,
 322                                   data->ev_ctx,
 323                                   data->pf,
 324                                   data->listen_fd_size,
 325                                   data->listen_fds);
 326         if (!req) {
 327                 DEBUG(1, ("Failed to make listening request!?\n"));
 328                 talloc_free(next);
 329                 return;
 330         }
 331         tevent_req_set_callback(req, mdssd_handle_client, next);
 332 }
 333
 334 static void mdssd_handle_client(struct tevent_req *req)
 335 {
 336         struct mdssd_children_data *data;
 337         struct mdssd_new_client *client;
 338         const DATA_BLOB ping = data_blob_null;
 339         int rc;
 340         int sd;
 341         TALLOC_CTX *tmp_ctx;
 342         struct tsocket_address *srv_addr;
 343         struct tsocket_address *cli_addr;
 344         void *listen_fd_data = NULL;
 345         struct dcesrv_endpoint *ep = NULL;
 346         enum dcerpc_transport_t transport;
 347         dcerpc_ncacn_termination_fn term_fn = NULL;
 348         void *term_fn_data = NULL;
 349
 350         client = tevent_req_callback_data(req, struct mdssd_new_client);
 351         data = client->data;
 352
 353         tmp_ctx = talloc_stackframe();
 354         if (tmp_ctx == NULL) {
 355                 DEBUG(1, ("Failed to allocate stackframe!\n"));
 356                 return;
 357         }
 358
 359         rc = prefork_listen_recv(req,
 360                                  tmp_ctx,
 361                                  &sd,
 362                                  &listen_fd_data,
 363                                  &srv_addr,
 364                                  &cli_addr);
 365
 366         /* this will free the request too */
 367         talloc_free(client);
 368
 369         if (rc != 0) {
 370                 DEBUG(6, ("No client connection was available after all!\n"));
 371                 goto done;
 372         }
 373
 374         ep = talloc_get_type_abort(listen_fd_data, struct dcesrv_endpoint);
 375         transport = dcerpc_binding_get_transport(ep->ep_description);
 376         if (transport == NCACN_NP) {
 377                 term_fn = mdssd_client_terminated;
 378                 term_fn_data = data;
 379         }
 380
 381         /* Warn parent that our status changed */
 382         messaging_send(data->msg_ctx, parent_id,
 383                         MSG_PREFORK_CHILD_EVENT, &ping);
 384
 385         DBG_INFO("MDSSD preforked child %d got client connection on '%s'\n",
 386                   (int)(data->pf->pid), dcerpc_binding_string(tmp_ctx,
 387                           ep->ep_description));
 388
 389         dcerpc_ncacn_accept(data->ev_ctx,
 390                             data->msg_ctx,
 391                             data->dce_ctx,
 392                             ep,
 393                             cli_addr,
 394                             srv_addr,
 395                             sd,
 396                             term_fn,
 397                             term_fn_data);
 398
 399 done:
 400         talloc_free(tmp_ctx);
 401 }
 402
 403 /*
 404  * MAIN
 405  */
 406
 407 static void child_ping(struct messaging_context *msg_ctx,
 408                         void *private_data,
 409                         uint32_t msg_type,
 410                         struct server_id server_id,
 411                         DATA_BLOB *data)
 412 {
 413         struct tevent_context *ev_ctx;
 414
 415         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 416
 417         DEBUG(10, ("Got message that a child changed status.\n"));
 418         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 419 }
 420
 421 static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
 422                                  struct messaging_context *msg_ctx,
 423                                  struct timeval current_time);
 424
 425 static void mdssd_check_children(struct tevent_context *ev_ctx,
 426                                     struct tevent_timer *te,
 427                                     struct timeval current_time,
 428                                     void *pvt);
 429
 430 static void mdssd_sigchld_handler(struct tevent_context *ev_ctx,
 431                                   struct prefork_pool *pfp,
 432                                   void *pvt)
 433 {
 434         struct messaging_context *msg_ctx;
 435
 436         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 437
 438         /* run pool management so we can fork/retire or increase
 439          * the allowed connections per child based on load */
 440         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 441 }
 442
 443 static bool mdssd_setup_children_monitor(struct tevent_context *ev_ctx,
 444                                          struct messaging_context *msg_ctx)
 445 {
 446         bool ok;
 447
 448         /* add our oun sigchld callback */
 449         prefork_set_sigchld_callback(mdssd_pool, mdssd_sigchld_handler, msg_ctx);
 450
 451         ok = mdssd_schedule_check(ev_ctx, msg_ctx, tevent_timeval_current());
 452
 453         return ok;
 454 }
 455
 456 static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
 457                                  struct messaging_context *msg_ctx,
 458                                  struct timeval current_time)
 459 {
 460         struct tevent_timer *te;
 461         struct timeval next_event;
 462
 463         /* check situation again in 10 seconds */
 464         next_event = tevent_timeval_current_ofs(10, 0);
 465
 466         /* TODO: check when the socket becomes readable, so that children
 467          * are checked only when there is some activity ? */
 468         te = tevent_add_timer(ev_ctx, mdssd_pool, next_event,
 469                               mdssd_check_children, msg_ctx);
 470         if (!te) {
 471                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 472                 return false;
 473         }
 474
 475         return true;
 476 }
 477
 478 static void mdssd_check_children(struct tevent_context *ev_ctx,
 479                                  struct tevent_timer *te,
 480                                  struct timeval current_time,
 481                                  void *pvt)
 482 {
 483         struct messaging_context *msg_ctx;
 484
 485         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 486
 487         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 488
 489         mdssd_schedule_check(ev_ctx, msg_ctx, current_time);
 490 }
 491
 492 /*
 493  * start it up
 494  */
 495
 496 static NTSTATUS mdssd_create_sockets(struct tevent_context *ev_ctx,
 497                                      struct messaging_context *msg_ctx,
 498                                      struct dcesrv_context *dce_ctx,
 499                                      struct pf_listen_fd *listen_fd,
 500                                      int *listen_fd_size)
 501 {
 502         NTSTATUS status;
 503         int fd = -1;
 504         int rc;
 505         uint32_t i;
 506         struct dcesrv_endpoint *e = NULL;
 507
 508         DBG_INFO("Initializing DCE/RPC connection endpoints\n");
 509
 510         for (e = dce_ctx->endpoint_list; e; e = e->next) {
 511                 status = dcesrv_create_endpoint_sockets(ev_ctx,
 512                                                         msg_ctx,
 513                                                         dce_ctx,
 514                                                         e,
 515                                                         listen_fd,
 516                                                         listen_fd_size);
 517                 if (!NT_STATUS_IS_OK(status)) {
 518                         char *ep_string = dcerpc_binding_string(
 519                                         dce_ctx, e->ep_description);
 520                         DBG_ERR("Failed to create endpoint '%s': %s\n",
 521                                 ep_string, nt_errstr(status));
 522                         TALLOC_FREE(ep_string);
 523                         goto done;
 524                 }
 525         }
 526
 527         for (i = 0; i < *listen_fd_size; i++) {
 528                 rc = listen(listen_fd[i].fd, pf_mdssd_cfg.max_allowed_clients);
 529                 if (rc == -1) {
 530                         char *ep_string = dcerpc_binding_string(
 531                                         dce_ctx, e->ep_description);
 532                         DBG_ERR("Failed to listen on endpoint '%s': %s\n",
 533                                 ep_string, strerror(errno));
 534                         status = map_nt_error_from_unix(errno);
 535                         TALLOC_FREE(ep_string);
 536                         goto done;
 537                 }
 538         }
 539
 540         for (e = dce_ctx->endpoint_list; e; e = e->next) {
 541                 struct dcesrv_if_list *ifl = NULL;
 542                 for (ifl = e->interface_list; ifl; ifl = ifl->next) {
 543                         status = rpc_ep_register(ev_ctx,
 544                                                  msg_ctx,
 545                                                  dce_ctx,
 546                                                  ifl->iface);
 547                         if (!NT_STATUS_IS_OK(status)) {
 548                                 DBG_ERR("Failed to register interface in "
 549                                         "endpoint mapper: %s",
 550                                         nt_errstr(status));
 551                                 goto done;
 552                         }
 553                 }
 554         }
 555
 556         status = NT_STATUS_OK;
 557 done:
 558         if (fd != -1) {
 559                 close(fd);
 560         }
 561         return status;
 562 }
 563
 564 void start_mdssd(struct tevent_context *ev_ctx,
 565                  struct messaging_context *msg_ctx,
 566                  struct dcesrv_context *dce_ctx)
 567 {
 568         NTSTATUS status;
 569         struct pf_listen_fd listen_fd[MDSSD_MAX_SOCKETS];
 570         int listen_fd_size = 0;
 571         pid_t pid;
 572         int rc;
 573         bool ok;
 574
 575         DEBUG(1, ("Forking Metadata Service Daemon\n"));
 576
 577         /*
 578          * Block signals before forking child as it will have to
 579          * set its own handlers. Child will re-enable SIGHUP as
 580          * soon as the handlers are set up.
 581          */
 582         BlockSignals(true, SIGTERM);
 583         BlockSignals(true, SIGHUP);
 584
 585         pid = fork();
 586         if (pid == -1) {
 587                 DEBUG(0, ("Failed to fork mdssd [%s], aborting ...\n",
 588                            strerror(errno)));
 589                 exit(1);
 590         }
 591
 592         /* parent or error */
 593         if (pid != 0) {
 594
 595                 /* Re-enable SIGHUP before returnig */
 596                 BlockSignals(false, SIGTERM);
 597                 BlockSignals(false, SIGHUP);
 598
 599                 return;
 600         }
 601
 602         status = smbd_reinit_after_fork(msg_ctx, ev_ctx, true, "mdssd-master");
 603         if (!NT_STATUS_IS_OK(status)) {
 604                 DEBUG(0,("reinit_after_fork() failed\n"));
 605                 smb_panic("reinit_after_fork() failed");
 606         }
 607
 608         reopen_logs();
 609
 610         /* save the parent process id so the children can use it later */
 611         parent_id = messaging_server_id(msg_ctx);
 612
 613         pfh_daemon_config(DAEMON_NAME,
 614                           &pf_mdssd_cfg,
 615                           &default_pf_mdssd_cfg);
 616
 617         mdssd_setup_sig_term_handler(ev_ctx);
 618         mdssd_setup_sig_hup_handler(ev_ctx);
 619
 620         BlockSignals(false, SIGTERM);
 621         BlockSignals(false, SIGHUP);
 622
 623         /* The module setup function will register the endpoint server,
 624          * necessary to setup the endpoints below. It is not possible to
 625          * register it here because MDS service is built as a module.
 626          */
 627         ok = setup_rpc_module(ev_ctx, msg_ctx, "mdssvc");
 628         if (!ok) {
 629                 DBG_ERR("Failed to setup DCE/RPC module\n");
 630                 exit(1);
 631         }
 632
 633         DBG_INFO("Reinitializing DCE/RPC server context\n");
 634
 635         status = dcesrv_reinit_context(dce_ctx);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 DBG_ERR("Failed to reinit DCE/RPC context: %s\n",
 638                         nt_errstr(status));
 639                 exit(1);
 640         }
 641
 642         DBG_INFO("Initializing DCE/RPC registered endpoint servers\n");
 643
 644         /* Init ep servers */
 645         status = dcesrv_init_ep_server(dce_ctx, "mdssvc");
 646         if (!NT_STATUS_IS_OK(status)) {
 647                 DBG_ERR("Failed to init DCE/RPC endpoint server: %s\n",
 648                         nt_errstr(status));
 649                 exit(1);
 650         }
 651
 652         status = mdssd_create_sockets(ev_ctx,
 653                                       msg_ctx,
 654                                       dce_ctx,
 655                                       listen_fd,
 656                                       &listen_fd_size);
 657         if (!NT_STATUS_IS_OK(status)) {
 658                 exit(1);
 659         }
 660
 661         /* start children before any more initialization is done */
 662         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 663                                  ev_ctx,
 664                                  msg_ctx,
 665                                  listen_fd_size,
 666                                  listen_fd,
 667                                  pf_mdssd_cfg.min_children,
 668                                  pf_mdssd_cfg.max_children,
 669                                  &mdssd_children_main,
 670                                  dce_ctx,
 671                                  &mdssd_pool);
 672         if (!ok) {
 673                 exit(1);
 674         }
 675
 676         messaging_register(msg_ctx,
 677                            ev_ctx,
 678                            MSG_SMB_CONF_UPDATED,
 679                            mdssd_smb_conf_updated);
 680         messaging_register(msg_ctx, ev_ctx,
 681                            MSG_PREFORK_CHILD_EVENT, child_ping);
 682
 683         ok = mdssd_setup_children_monitor(ev_ctx, msg_ctx);
 684         if (!ok) {
 685                 exit(1);
 686         }
 687
 688         DEBUG(1, ("mdssd Daemon Started (%u)\n", (unsigned int)getpid()));
 689
 690         /* loop forever */
 691         rc = tevent_loop_wait(ev_ctx);
 692
 693         /* should not be reached */
 694         DEBUG(0,("mdssd: tevent_loop_wait() exited with %d - %s\n",
 695                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 696         exit(1);
 697 }