multipathd/main.c

   1 /*
   2  * Copyright (c) 2004, 2005 Christophe Varoqui
   3  * Copyright (c) 2005 Kiyoshi Ueda, NEC
   4  * Copyright (c) 2005 Benjamin Marzinski, Redhat
   5  * Copyright (c) 2005 Edward Goggin, EMC
   6  */
   7 #include <unistd.h>
   8 #include <sys/stat.h>
   9 #include <libdevmapper.h>
  10 #include <wait.h>
  11 #include <sys/mman.h>
  12 #include <sys/types.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15
  16 /*
  17  * libsysfs
  18  */
  19 #include <sysfs/libsysfs.h>
  20 #include <sysfs/dlist.h>
  21
  22 /*
  23  * libcheckers
  24  */
  25 #include <checkers.h>
  26 #include <path_state.h>
  27
  28 /*
  29  * libmultipath
  30  */
  31 #include <parser.h>
  32 #include <vector.h>
  33 #include <memory.h>
  34 #include <config.h>
  35 #include <callout.h>
  36 #include <util.h>
  37 #include <blacklist.h>
  38 #include <hwtable.h>
  39 #include <defaults.h>
  40 #include <structs.h>
  41 #include <dmparser.h>
  42 #include <devmapper.h>
  43 #include <dict.h>
  44 #include <discovery.h>
  45 #include <debug.h>
  46 #include <propsel.h>
  47 #include <uevent.h>
  48 #include <switchgroup.h>
  49 #include <path_state.h>
  50 #include <print.h>
  51
  52 #include "main.h"
  53 #include "pidfile.h"
  54 #include "uxlsnr.h"
  55 #include "uxclnt.h"
  56 #include "cli.h"
  57 #include "cli_handlers.h"
  58
  59 #define FILE_NAME_SIZE 256
  60 #define CMDSIZE 160
  61
  62 #define LOG_MSG(a,b) \
  63         if (strlen(b)) { \
  64                 condlog(a, "%s: %s", pp->dev_t, b); \
  65                 memset(b, 0, MAX_CHECKER_MSG_SIZE); \
  66         }
  67
  68 #ifdef LCKDBG
  69 #define lock(a) \
  70         fprintf(stderr, "%s:%s(%i) lock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  71         pthread_mutex_lock(a)
  72 #define unlock(a) \
  73         fprintf(stderr, "%s:%s(%i) unlock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  74         pthread_mutex_unlock(a)
  75 #define lock_cleanup_pop(a) \
  76         fprintf(stderr, "%s:%s(%i) unlock %p\n", __FILE__, __FUNCTION__, __LINE__, a); \
  77         pthread_cleanup_pop(1);
  78 #else
  79 #define lock(a) pthread_mutex_lock(a)
  80 #define unlock(a) pthread_mutex_unlock(a)
  81 #define lock_cleanup_pop(a) pthread_cleanup_pop(1);
  82 #endif
  83
  84 pthread_cond_t exit_cond = PTHREAD_COND_INITIALIZER;
  85 pthread_mutex_t exit_mutex = PTHREAD_MUTEX_INITIALIZER;
  86
  87 /*
  88  * structs
  89  */
  90 struct event_thread {
  91         struct dm_task *dmt;
  92         pthread_t thread;
  93         int event_nr;
  94         char mapname[WWID_SIZE];
  95         struct vectors *vecs;
  96 };
  97
  98 static struct event_thread *
  99 alloc_waiter (void)
 100 {
 101
 102         struct event_thread * wp;
 103
 104         wp = (struct event_thread *)MALLOC(sizeof(struct event_thread));
 105
 106         return wp;
 107 }
 108
 109 static void
 110 free_waiter (void * data)
 111 {
 112         struct event_thread * wp = (struct event_thread *)data;
 113
 114         if (wp->dmt)
 115                 dm_task_destroy(wp->dmt);
 116         FREE(wp);
 117 }
 118
 119 static void
 120 stop_waiter_thread (struct multipath * mpp, struct vectors * vecs)
 121 {
 122         struct event_thread * wp = (struct event_thread *)mpp->waiter;
 123         pthread_t thread;
 124
 125         if (!wp) {
 126                 condlog(3, "%s: no waiter thread", mpp->alias);
 127                 return;
 128         }
 129         thread = wp->thread;
 130
 131         if (!wp) {
 132                 condlog(3, "%s: thread not started", mpp->alias);
 133                 return;
 134         }
 135         condlog(2, "%s: stop event checker thread", wp->mapname);
 136         pthread_kill(thread, SIGHUP);
 137 }
 138
 139 static void
 140 cleanup_lock (void * data)
 141 {
 142         pthread_mutex_unlock((pthread_mutex_t *)data);
 143 }
 144
 145 static void
 146 adopt_paths (struct vectors * vecs, struct multipath * mpp)
 147 {
 148         int i;
 149         struct path * pp;
 150
 151         if (!mpp)
 152                 return;
 153
 154         vector_foreach_slot (vecs->pathvec, pp, i) {
 155                 if (!strncmp(mpp->wwid, pp->wwid, WWID_SIZE)) {
 156                         condlog(4, "%s ownership set", pp->dev_t);
 157                         pp->mpp = mpp;
 158                 }
 159         }
 160 }
 161
 162 static void
 163 orphan_path (struct path * pp)
 164 {
 165         pp->mpp = NULL;
 166         pp->checkfn = NULL;
 167         pp->dmstate = PSTATE_UNDEF;
 168         pp->checker_context = NULL;
 169         pp->getuid = NULL;
 170         pp->getprio = NULL;
 171         pp->getprio_selected = 0;
 172
 173         if (pp->fd >= 0)
 174                 close(pp->fd);
 175
 176         pp->fd = -1;
 177 }
 178
 179 static void
 180 orphan_paths (struct vectors * vecs, struct multipath * mpp)
 181 {
 182         int i;
 183         struct path * pp;
 184
 185         vector_foreach_slot (vecs->pathvec, pp, i) {
 186                 if (pp->mpp == mpp) {
 187                         condlog(4, "%s is orphaned", pp->dev_t);
 188                         orphan_path(pp);
 189                 }
 190         }
 191 }
 192
 193 static int
 194 update_multipath_table (struct multipath *mpp, vector pathvec)
 195 {
 196         if (!mpp)
 197                 return 1;
 198
 199         if (dm_get_map(mpp->alias, &mpp->size, mpp->params))
 200                 return 1;
 201
 202         if (disassemble_map(pathvec, mpp->params, mpp))
 203                 return 1;
 204
 205         return 0;
 206 }
 207
 208 static int
 209 update_multipath_status (struct multipath *mpp)
 210 {
 211         if (!mpp)
 212                 return 1;
 213
 214         if(dm_get_status(mpp->alias, mpp->status))
 215                 return 1;
 216
 217         if (disassemble_status(mpp->status, mpp))
 218                 return 1;
 219
 220         return 0;
 221 }
 222
 223 static int
 224 update_multipath_strings (struct multipath *mpp, vector pathvec)
 225 {
 226         free_multipath_attributes(mpp);
 227         free_pgvec(mpp->pg, KEEP_PATHS);
 228         mpp->pg = NULL;
 229
 230         if (update_multipath_table(mpp, pathvec))
 231                 return 1;
 232
 233         if (update_multipath_status(mpp))
 234                 return 1;
 235
 236         return 0;
 237 }
 238
 239 static void
 240 set_multipath_wwid (struct multipath * mpp)
 241 {
 242         if (mpp->wwid)
 243                 return;
 244
 245         dm_get_uuid(mpp->alias, mpp->wwid);
 246 }
 247
 248 /*
 249  * mpp->no_path_retry:
 250  *   -2 (QUEUE) : queue_if_no_path enabled, never turned off
 251  *   -1 (FAIL)  : fail_if_no_path
 252  *    0 (UNDEF) : nothing
 253  *   >0         : queue_if_no_path enabled, turned off after polling n times
 254  */
 255 static void
 256 update_queue_mode_del_path(struct multipath *mpp)
 257 {
 258         if (--mpp->nr_active == 0 && mpp->no_path_retry > 0) {
 259                 /*
 260                  * Enter retry mode.
 261                  * meaning of +1: retry_tick may be decremented in
 262                  *                checkerloop before starting retry.
 263                  */
 264                 mpp->retry_tick = mpp->no_path_retry * conf->checkint + 1;
 265                 condlog(1, "%s: Entering recovery mode: max_retries=%d",
 266                         mpp->alias, mpp->no_path_retry);
 267         }
 268         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 269 }
 270
 271 static void
 272 update_queue_mode_add_path(struct multipath *mpp)
 273 {
 274         if (mpp->nr_active++ == 0 && mpp->no_path_retry > 0) {
 275                 /* come back to normal mode from retry mode */
 276                 mpp->retry_tick = 0;
 277                 dm_queue_if_no_path(mpp->alias, 1);
 278                 condlog(2, "%s: queue_if_no_path enabled", mpp->alias);
 279                 condlog(1, "%s: Recovered to normal mode", mpp->alias);
 280         }
 281         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 282 }
 283
 284 static void
 285 set_no_path_retry(struct multipath *mpp)
 286 {
 287         mpp->retry_tick = 0;
 288         mpp->nr_active = pathcount(mpp, PATH_UP);
 289         select_no_path_retry(mpp);
 290
 291         switch (mpp->no_path_retry) {
 292         case NO_PATH_RETRY_UNDEF:
 293                 break;
 294         case NO_PATH_RETRY_FAIL:
 295                 dm_queue_if_no_path(mpp->alias, 0);
 296                 break;
 297         case NO_PATH_RETRY_QUEUE:
 298                 dm_queue_if_no_path(mpp->alias, 1);
 299                 break;
 300         default:
 301                 dm_queue_if_no_path(mpp->alias, 1);
 302                 if (mpp->nr_active == 0) {
 303                         /* Enter retry mode */
 304                         mpp->retry_tick = mpp->no_path_retry * conf->checkint;
 305                         condlog(1, "%s: Entering recovery mode: max_retries=%d",
 306                                 mpp->alias, mpp->no_path_retry);
 307                 }
 308                 break;
 309         }
 310 }
 311
 312 static struct hwentry *
 313 extract_hwe_from_path(struct multipath * mpp)
 314 {
 315         struct path * pp;
 316         struct pathgroup * pgp;
 317
 318         pgp = VECTOR_SLOT(mpp->pg, 0);
 319         pp = VECTOR_SLOT(pgp->paths, 0);
 320
 321         return pp->hwe;
 322 }
 323
 324 static void
 325 remove_map (struct multipath * mpp, struct vectors * vecs)
 326 {
 327         int i;
 328
 329         stop_waiter_thread(mpp, vecs);
 330
 331         /*
 332          * clear references to this map
 333          */
 334         orphan_paths(vecs, mpp);
 335
 336         /*
 337          * purge the multipath vector
 338          */
 339         i = find_slot(vecs->mpvec, (void *)mpp);
 340         vector_del_slot(vecs->mpvec, i);
 341
 342         /*
 343          * final free
 344          */
 345         free_multipath(mpp, KEEP_PATHS);
 346         mpp = NULL;
 347 }
 348
 349 static void
 350 remove_maps (struct vectors * vecs)
 351 {
 352         int i;
 353         struct multipath * mpp;
 354
 355         vector_foreach_slot (vecs->mpvec, mpp, i) {
 356                 remove_map(mpp, vecs);
 357                 i--;
 358         }
 359
 360         vector_free(vecs->mpvec);
 361         vecs->mpvec = NULL;
 362 }
 363
 364 static int
 365 setup_multipath (struct vectors * vecs, struct multipath * mpp)
 366 {
 367         if (dm_get_info(mpp->alias, &mpp->dmi))
 368                 goto out;
 369
 370         set_multipath_wwid(mpp);
 371         mpp->mpe = find_mpe(mpp->wwid);
 372         condlog(4, "discovered map %s", mpp->alias);
 373
 374         if (update_multipath_strings(mpp, vecs->pathvec))
 375                 goto out;
 376
 377         adopt_paths(vecs, mpp);
 378         mpp->hwe = extract_hwe_from_path(mpp);
 379         select_pgfailback(mpp);
 380         set_no_path_retry(mpp);
 381
 382         return 0;
 383 out:
 384         condlog(0, "%s: failed to setup multipath", mpp->alias);
 385         remove_map(mpp, vecs);
 386         return 1;
 387 }
 388
 389 static int
 390 need_switch_pathgroup (struct multipath * mpp, int refresh)
 391 {
 392         struct pathgroup * pgp;
 393         struct path * pp;
 394         int i, j;
 395
 396         if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
 397                 return 0;
 398
 399         /*
 400          * Refresh path priority values
 401          */
 402         if (refresh)
 403                 vector_foreach_slot (mpp->pg, pgp, i)
 404                         vector_foreach_slot (pgp->paths, pp, j)
 405                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 406
 407         mpp->bestpg = select_path_group(mpp);
 408
 409         if (mpp->bestpg != mpp->nextpg)
 410                 return 1;
 411
 412         return 0;
 413 }
 414
 415 static void
 416 switch_pathgroup (struct multipath * mpp)
 417 {
 418         dm_switchgroup(mpp->alias, mpp->bestpg);
 419         condlog(2, "%s: switch to path group #%i",
 420                  mpp->alias, mpp->bestpg);
 421 }
 422
 423 static int
 424 update_multipath (struct vectors *vecs, char *mapname)
 425 {
 426         struct multipath *mpp;
 427         struct pathgroup  *pgp;
 428         struct path *pp;
 429         int i, j;
 430         int r = 1;
 431
 432         mpp = find_mp_by_alias(vecs->mpvec, mapname);
 433
 434         if (!mpp)
 435                 goto out;
 436
 437         free_pgvec(mpp->pg, KEEP_PATHS);
 438         mpp->pg = NULL;
 439
 440         if (setup_multipath(vecs, mpp))
 441                 goto out; /* mpp freed in setup_multipath */
 442
 443         /*
 444          * compare checkers states with DM states
 445          */
 446         vector_foreach_slot (mpp->pg, pgp, i) {
 447                 vector_foreach_slot (pgp->paths, pp, j) {
 448                         if (pp->dmstate != PSTATE_FAILED)
 449                                 continue;
 450
 451                         if (pp->state != PATH_DOWN) {
 452                                 condlog(2, "%s: mark as failed", pp->dev_t);
 453                                 pp->state = PATH_DOWN;
 454                                 update_queue_mode_del_path(mpp);
 455
 456                                 /*
 457                                  * if opportune,
 458                                  * schedule the next check earlier
 459                                  */
 460                                 if (pp->tick > conf->checkint)
 461                                         pp->tick = conf->checkint;
 462                         }
 463                 }
 464         }
 465         r = 0;
 466 out:
 467         if (r)
 468                 condlog(0, "failed to update multipath");
 469
 470         return r;
 471 }
 472
 473 static sigset_t unblock_sighup(void)
 474 {
 475         sigset_t set, old;
 476
 477         sigemptyset(&set);
 478         sigaddset(&set, SIGHUP);
 479         pthread_sigmask(SIG_UNBLOCK, &set, &old);
 480         return old;
 481 }
 482
 483 /*
 484  * returns the reschedule delay
 485  * negative means *stop*
 486  */
 487 static int
 488 waiteventloop (struct event_thread * waiter)
 489 {
 490         sigset_t set;
 491         int event_nr;
 492         int r;
 493
 494         if (!waiter->event_nr)
 495                 waiter->event_nr = dm_geteventnr(waiter->mapname);
 496
 497         if (!(waiter->dmt = dm_task_create(DM_DEVICE_WAITEVENT)))
 498                 return 1;
 499
 500         if (!dm_task_set_name(waiter->dmt, waiter->mapname)) {
 501                 dm_task_destroy(waiter->dmt);
 502                 return 1;
 503         }
 504
 505         if (waiter->event_nr && !dm_task_set_event_nr(waiter->dmt,
 506                                                       waiter->event_nr)) {
 507                 dm_task_destroy(waiter->dmt);
 508                 return 1;
 509         }
 510
 511         dm_task_no_open_count(waiter->dmt);
 512
 513         /* accept wait interruption */
 514         set = unblock_sighup();
 515
 516         /* interruption spits messages */
 517         dm_shut_log();
 518
 519         /* wait */
 520         r = dm_task_run(waiter->dmt);
 521
 522         /* wait is over : event or interrupt */
 523         pthread_sigmask(SIG_SETMASK, &set, NULL);
 524         //dm_restore_log();
 525
 526         if (!r) /* wait interrupted by signal */
 527                 return -1;
 528
 529         dm_task_destroy(waiter->dmt);
 530         waiter->dmt = NULL;
 531         waiter->event_nr++;
 532
 533         /*
 534          * upon event ...
 535          */
 536         while (1) {
 537                 condlog(3, "%s: devmap event #%i",
 538                                 waiter->mapname, waiter->event_nr);
 539
 540                 /*
 541                  * event might be :
 542                  *
 543                  * 1) a table reload, which means our mpp structure is
 544                  *    obsolete : refresh it through update_multipath()
 545                  * 2) a path failed by DM : mark as such through
 546                  *    update_multipath()
 547                  * 3) map has gone away : stop the thread.
 548                  * 4) a path reinstate : nothing to do
 549                  * 5) a switch group : nothing to do
 550                  */
 551                 pthread_cleanup_push(cleanup_lock, waiter->vecs->lock);
 552                 lock(waiter->vecs->lock);
 553                 r = update_multipath(waiter->vecs, waiter->mapname);
 554                 lock_cleanup_pop(waiter->vecs->lock);
 555
 556                 if (r)
 557                         return -1; /* stop the thread */
 558
 559                 event_nr = dm_geteventnr(waiter->mapname);
 560
 561                 if (waiter->event_nr == event_nr)
 562                         return 1; /* upon problem reschedule 1s later */
 563
 564                 waiter->event_nr = event_nr;
 565         }
 566         return -1; /* never reach there */
 567 }
 568
 569 static void *
 570 waitevent (void * et)
 571 {
 572         int r;
 573         struct event_thread *waiter;
 574
 575         mlockall(MCL_CURRENT | MCL_FUTURE);
 576
 577         waiter = (struct event_thread *)et;
 578         pthread_cleanup_push(free_waiter, et);
 579
 580         while (1) {
 581                 r = waiteventloop(waiter);
 582
 583                 if (r < 0)
 584                         break;
 585
 586                 sleep(r);
 587         }
 588
 589         pthread_cleanup_pop(1);
 590         return NULL;
 591 }
 592
 593 static int
 594 start_waiter_thread (struct multipath * mpp, struct vectors * vecs)
 595 {
 596         pthread_attr_t attr;
 597         struct event_thread * wp;
 598
 599         if (!mpp)
 600                 return 0;
 601
 602         if (pthread_attr_init(&attr))
 603                 goto out;
 604
 605         pthread_attr_setstacksize(&attr, 32 * 1024);
 606         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 607
 608         wp = alloc_waiter();
 609
 610         if (!wp)
 611                 goto out;
 612
 613         mpp->waiter = (void *)wp;
 614         strncpy(wp->mapname, mpp->alias, WWID_SIZE);
 615         wp->vecs = vecs;
 616
 617         if (pthread_create(&wp->thread, &attr, waitevent, wp)) {
 618                 condlog(0, "%s: cannot create event checker", wp->mapname);
 619                 goto out1;
 620         }
 621         condlog(2, "%s: event checker started", wp->mapname);
 622
 623         return 0;
 624 out1:
 625         free_waiter(wp);
 626         mpp->waiter = NULL;
 627 out:
 628         condlog(0, "failed to start waiter thread");
 629         return 1;
 630 }
 631
 632 int
 633 uev_add_map (char * devname, struct vectors * vecs)
 634 {
 635         int major, minor;
 636         char dev_t[BLK_DEV_SIZE];
 637         char * alias;
 638         struct multipath * mpp;
 639
 640         if (sscanf(devname, "dm-%d", &minor) == 1 &&
 641             !sysfs_get_dev(sysfs_path, devname, dev_t, BLK_DEV_SIZE) &&
 642             sscanf(dev_t, "%d:%d", &major, &minor) == 2)
 643                 alias = dm_mapname(major, minor);
 644         else
 645                 alias = STRDUP(devname);
 646
 647         if (!alias)
 648                 return 1;
 649
 650         if (!dm_type(alias, DEFAULT_TARGET)) {
 651                 condlog(4, "%s: not a multipath map", alias);
 652                 FREE(alias);
 653                 return 0;
 654         }
 655
 656         mpp = find_mp_by_alias(vecs->mpvec, alias);
 657
 658         if (mpp) {
 659                 /*
 660                  * this should not happen,
 661                  * we missed a remove map event (not sent ?)
 662                  */
 663                 condlog(2, "%s: already registered", alias);
 664                 remove_map(mpp, vecs);
 665         }
 666
 667         /*
 668          * now we can allocate
 669          */
 670         mpp = alloc_multipath();
 671
 672         if (!mpp)
 673                 return 1;
 674
 675         mpp->alias = alias;
 676
 677         if (setup_multipath(vecs, mpp))
 678                 return 1; /* mpp freed in setup_multipath */
 679
 680         if (!vector_alloc_slot(vecs->mpvec))
 681                 goto out;
 682
 683         vector_set_slot(vecs->mpvec, mpp);
 684         adopt_paths(vecs, mpp);
 685
 686         if (start_waiter_thread(mpp, vecs))
 687                 goto out;
 688
 689         return 0;
 690 out:
 691         condlog(2, "%s: add devmap failed", mpp->alias);
 692         remove_map(mpp, vecs);
 693         return 1;
 694 }
 695
 696 int
 697 uev_remove_map (char * devname, struct vectors * vecs)
 698 {
 699         int minor;
 700         struct multipath * mpp;
 701
 702         if (sscanf(devname, "dm-%d", &minor) == 1)
 703                 mpp = find_mp_by_minor(vecs->mpvec, minor);
 704         else
 705                 mpp = find_mp_by_alias(vecs->mpvec, devname);
 706
 707         if (!mpp) {
 708                 condlog(3, "%s: devmap not registered, can't remove",
 709                         devname);
 710                 return 0;
 711         }
 712
 713         condlog(2, "remove %s devmap", mpp->alias);
 714         remove_map(mpp, vecs);
 715
 716         return 0;
 717 }
 718
 719 int
 720 uev_add_path (char * devname, struct vectors * vecs)
 721 {
 722         struct path * pp;
 723
 724         pp = find_path_by_dev(vecs->pathvec, devname);
 725
 726         if (pp) {
 727                 condlog(3, "%s: already in pathvec");
 728                 return 1;
 729         }
 730         pp = store_pathinfo(vecs->pathvec, conf->hwtable,
 731                        devname, DI_SYSFS | DI_WWID);
 732
 733         if (!pp) {
 734                 condlog(0, "%s: failed to store path info", devname);
 735                 return 1;
 736         }
 737
 738         condlog(2, "%s: path checker registered", devname);
 739         pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
 740
 741         if (pp->mpp) {
 742                 condlog(4, "%s: ownership set to %s",
 743                                 pp->dev_t, pp->mpp->alias);
 744         } else {
 745                 condlog(4, "%s: orphaned", pp->dev_t);
 746                 orphan_path(pp);
 747         }
 748
 749         return 0;
 750 }
 751
 752 int
 753 uev_remove_path (char * devname, struct vectors * vecs)
 754 {
 755         int i;
 756         struct path * pp;
 757
 758         pp = find_path_by_dev(vecs->pathvec, devname);
 759
 760         if (!pp) {
 761                 condlog(3, "%s: not in pathvec");
 762                 return 1;
 763         }
 764
 765         if (pp->mpp && pp->state == PATH_UP)
 766                 update_queue_mode_del_path(pp->mpp);
 767
 768         condlog(2, "remove %s path checker", devname);
 769         i = find_slot(vecs->pathvec, (void *)pp);
 770         vector_del_slot(vecs->pathvec, i);
 771         free_path(pp);
 772
 773         return 0;
 774 }
 775
 776 int
 777 show_paths (char ** r, int * len, struct vectors * vecs)
 778 {
 779         int i;
 780         struct path * pp;
 781         char * c;
 782         char * reply;
 783         int maxlen = INITIAL_REPLY_LEN;
 784         int again = 1;
 785
 786         get_path_layout(vecs->pathvec);
 787         reply = MALLOC(maxlen);
 788
 789         while (again) {
 790                 if (!reply)
 791                         return 1;
 792
 793                 c = reply;
 794
 795                 if (VECTOR_SIZE(vecs->pathvec) > 0)
 796                         c += snprint_path_header(c, reply + maxlen - c,
 797                                                  PRINT_PATH_CHECKER);
 798
 799                 vector_foreach_slot(vecs->pathvec, pp, i)
 800                         c += snprint_path(c, reply + maxlen - c,
 801                                           PRINT_PATH_CHECKER, pp);
 802
 803                 again = ((c - reply) == (maxlen - 1));
 804
 805                 if (again)
 806                         reply = REALLOC(reply, maxlen *= 2);
 807
 808         }
 809         *r = reply;
 810         *len = (int)(c - reply + 1);
 811         return 0;
 812 }
 813
 814 int
 815 show_maps (char ** r, int *len, struct vectors * vecs)
 816 {
 817         int i;
 818         struct multipath * mpp;
 819         char * c;
 820         char * reply;
 821         int maxlen = INITIAL_REPLY_LEN;
 822         int again = 1;
 823
 824         get_map_layout(vecs->mpvec);
 825         reply = MALLOC(maxlen);
 826
 827         while (again) {
 828                 if (!reply)
 829                         return 1;
 830
 831                 c = reply;
 832                 if (VECTOR_SIZE(vecs->mpvec) > 0)
 833                         c += snprint_map_header(c, reply + maxlen - c,
 834                                                 PRINT_MAP_FAILBACK);
 835
 836                 vector_foreach_slot(vecs->mpvec, mpp, i)
 837                         c += snprint_map(c, reply + maxlen - c,
 838                                          PRINT_MAP_FAILBACK, mpp);
 839
 840                 again = ((c - reply) == (maxlen - 1));
 841
 842                 if (again)
 843                         reply = REALLOC(reply, maxlen *= 2);
 844         }
 845         *r = reply;
 846         *len = (int)(c - reply + 1);
 847         return 0;
 848 }
 849
 850 int
 851 dump_pathvec (char ** r, int * len, struct vectors * vecs)
 852 {
 853         int i;
 854         struct path * pp;
 855         char * reply;
 856         char * p;
 857
 858         *len = VECTOR_SIZE(vecs->pathvec) * sizeof(struct path);
 859         reply = (char *)MALLOC(*len);
 860         *r = reply;
 861
 862         if (!reply)
 863                 return 1;
 864
 865         p = reply;
 866
 867         vector_foreach_slot (vecs->pathvec, pp, i) {
 868                 memcpy((void *)p, pp, sizeof(struct path));
 869                 p += sizeof(struct path);
 870         }
 871
 872         /* return negative to hint caller not to add "ok" to the dump */
 873         return -1;
 874 }
 875
 876 static int
 877 map_discovery (struct vectors * vecs)
 878 {
 879         int i;
 880         struct multipath * mpp;
 881
 882         if (dm_get_maps(vecs->mpvec, "multipath"))
 883                 return 1;
 884
 885         vector_foreach_slot (vecs->mpvec, mpp, i) {
 886                 if (setup_multipath(vecs, mpp))
 887                         return 1;
 888                 start_waiter_thread(mpp, vecs);
 889         }
 890
 891         return 0;
 892 }
 893
 894 int
 895 reconfigure (struct vectors * vecs)
 896 {
 897         struct config * old = conf;
 898         struct multipath * mpp;
 899         struct path * pp;
 900         int i;
 901
 902         conf = NULL;
 903
 904         if (load_config(DEFAULT_CONFIGFILE)) {
 905                 conf = old;
 906                 condlog(2, "reconfigure failed, continue with old config");
 907                 return 1;
 908         }
 909         conf->verbosity = old->verbosity;
 910         free_config(old);
 911
 912         vector_foreach_slot (vecs->mpvec, mpp, i) {
 913                 mpp->mpe = find_mpe(mpp->wwid);
 914                 mpp->hwe = extract_hwe_from_path(mpp);
 915                 adopt_paths(vecs, mpp);
 916                 set_no_path_retry(mpp);
 917         }
 918         vector_foreach_slot (vecs->pathvec, pp, i) {
 919                 select_checkfn(pp);
 920                 select_getuid(pp);
 921                 select_getprio(pp);
 922         }
 923         condlog(2, "reconfigured");
 924         return 0;
 925 }
 926
 927 int
 928 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 929 {
 930         struct vectors * vecs;
 931         int r;
 932
 933         *reply = NULL;
 934         *len = 0;
 935         vecs = (struct vectors *)trigger_data;
 936
 937         pthread_cleanup_push(cleanup_lock, vecs->lock);
 938         lock(vecs->lock);
 939
 940         r = parse_cmd(str, reply, len, vecs);
 941
 942         if (r > 0) {
 943                 *reply = STRDUP("fail\n");
 944                 *len = strlen(*reply) + 1;
 945                 r = 1;
 946         }
 947         else if (!r && *len == 0) {
 948                 *reply = STRDUP("ok\n");
 949                 *len = strlen(*reply) + 1;
 950                 r = 0;
 951         }
 952         /* else if (r < 0) leave *reply alone */
 953
 954         lock_cleanup_pop(vecs->lock);
 955         return r;
 956 }
 957
 958 static int
 959 uev_discard(char * devpath)
 960 {
 961         char a[10], b[10];
 962
 963         /*
 964          * keep only block devices, discard partitions
 965          */
 966         if (sscanf(devpath, "/block/%10s", a) != 1 ||
 967             sscanf(devpath, "/block/%10[^/]/%10s", a, b) == 2) {
 968                 condlog(4, "discard event on %s", devpath);
 969                 return 1;
 970         }
 971         return 0;
 972 }
 973
 974 int
 975 uev_trigger (struct uevent * uev, void * trigger_data)
 976 {
 977         int r = 0;
 978         char devname[32];
 979         struct vectors * vecs;
 980
 981         vecs = (struct vectors *)trigger_data;
 982
 983         if (uev_discard(uev->devpath))
 984                 return 1;
 985
 986         basename(uev->devpath, devname);
 987         lock(vecs->lock);
 988
 989         /*
 990          * device map add/remove event
 991          */
 992         if (!strncmp(devname, "dm-", 3)) {
 993                 if (!strncmp(uev->action, "add", 3)) {
 994                         r = uev_add_map(devname, vecs);
 995                         goto out;
 996                 }
 997 #if 0
 998                 if (!strncmp(uev->action, "remove", 6)) {
 999                         r = uev_remove_map(devname, vecs);
1000                         goto out;
1001                 }
1002 #endif
1003                 goto out;
1004         }
1005
1006         /*
1007          * path add/remove event
1008          */
1009         if (blacklist(conf->blist, devname))
1010                 goto out;
1011
1012         if (!strncmp(uev->action, "add", 3)) {
1013                 r = uev_add_path(devname, vecs);
1014                 goto out;
1015         }
1016         if (!strncmp(uev->action, "remove", 6)) {
1017                 r = uev_remove_path(devname, vecs);
1018                 goto out;
1019         }
1020
1021 out:
1022         unlock(vecs->lock);
1023         return r;
1024 }
1025
1026 static void *
1027 ueventloop (void * ap)
1028 {
1029         if (uevent_listen(&uev_trigger, ap))
1030                 fprintf(stderr, "error starting uevent listener");
1031
1032         return NULL;
1033 }
1034
1035 static void *
1036 uxlsnrloop (void * ap)
1037 {
1038         if (load_keys())
1039                 return NULL;
1040
1041         if (alloc_handlers())
1042                 return NULL;
1043
1044         add_handler(LIST+PATHS, cli_list_paths);
1045         add_handler(LIST+MAPS, cli_list_maps);
1046         add_handler(ADD+PATH, cli_add_path);
1047         add_handler(DEL+PATH, cli_del_path);
1048         add_handler(ADD+MAP, cli_add_map);
1049         add_handler(DEL+MAP, cli_del_map);
1050         add_handler(SWITCH+MAP+GROUP, cli_switch_group);
1051         add_handler(DUMP+PATHVEC, cli_dump_pathvec);
1052         add_handler(RECONFIGURE, cli_reconfigure);
1053         add_handler(SUSPEND+MAP, cli_suspend);
1054         add_handler(RESUME+MAP, cli_resume);
1055         add_handler(REINSTATE+PATH, cli_reinstate);
1056         add_handler(FAIL+PATH, cli_fail);
1057
1058         uxsock_listen(&uxsock_trigger, ap);
1059
1060         return NULL;
1061 }
1062
1063 static int
1064 exit_daemon (int status)
1065 {
1066         if (status != 0)
1067                 fprintf(stderr, "bad exit status. see daemon.log\n");
1068
1069         condlog(3, "unlink pidfile");
1070         unlink(DEFAULT_PIDFILE);
1071
1072         lock(&exit_mutex);
1073         pthread_cond_signal(&exit_cond);
1074         unlock(&exit_mutex);
1075
1076         return status;
1077 }
1078
1079 static void
1080 fail_path (struct path * pp)
1081 {
1082         if (!pp->mpp)
1083                 return;
1084
1085         condlog(2, "checker failed path %s in map %s",
1086                  pp->dev_t, pp->mpp->alias);
1087
1088         dm_fail_path(pp->mpp->alias, pp->dev_t);
1089         update_queue_mode_del_path(pp->mpp);
1090 }
1091
1092 /*
1093  * caller must have locked the path list before calling that function
1094  */
1095 static void
1096 reinstate_path (struct path * pp)
1097 {
1098         if (!pp->mpp)
1099                 return;
1100
1101         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
1102                 condlog(0, "%s: reinstate failed", pp->dev_t);
1103         else {
1104                 condlog(2, "%s: reinstated", pp->dev_t);
1105                 update_queue_mode_add_path(pp->mpp);
1106         }
1107 }
1108
1109 static void
1110 enable_group(struct path * pp)
1111 {
1112         struct pathgroup * pgp;
1113
1114         /*
1115          * if path is added through uev_add_path, pgindex can be unset.
1116          * next update_strings() will set it, upon map reload event.
1117          *
1118          * we can safely return here, because upon map reload, all
1119          * PG will be enabled.
1120          */
1121         if (!pp->mpp->pg || !pp->pgindex)
1122                 return;
1123
1124         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
1125
1126         if (pgp->status == PGSTATE_DISABLED) {
1127                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
1128                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
1129         }
1130 }
1131
1132 static void
1133 mpvec_garbage_collector (struct vectors * vecs)
1134 {
1135         struct multipath * mpp;
1136         int i;
1137
1138         vector_foreach_slot (vecs->mpvec, mpp, i) {
1139                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
1140                         condlog(2, "%s: remove dead map", mpp->alias);
1141                         remove_map(mpp, vecs);
1142                         i--;
1143                 }
1144         }
1145 }
1146
1147 static void
1148 defered_failback_tick (vector mpvec)
1149 {
1150         struct multipath * mpp;
1151         int i;
1152
1153         vector_foreach_slot (mpvec, mpp, i) {
1154                 /*
1155                  * defered failback getting sooner
1156                  */
1157                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
1158                         mpp->failback_tick--;
1159
1160                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
1161                                 switch_pathgroup(mpp);
1162                 }
1163         }
1164 }
1165
1166 static void
1167 retry_count_tick(vector mpvec)
1168 {
1169         struct multipath *mpp;
1170         int i;
1171
1172         vector_foreach_slot (mpvec, mpp, i) {
1173                 if (mpp->retry_tick) {
1174                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
1175                         if(--mpp->retry_tick == 0) {
1176                                 dm_queue_if_no_path(mpp->alias, 0);
1177                                 condlog(2, "%s: Disable queueing", mpp->alias);
1178                         }
1179                 }
1180         }
1181 }
1182
1183 static void *
1184 checkerloop (void *ap)
1185 {
1186         struct vectors *vecs;
1187         struct path *pp;
1188         int i, count = 0;
1189         int newstate;
1190         char checker_msg[MAX_CHECKER_MSG_SIZE];
1191
1192         mlockall(MCL_CURRENT | MCL_FUTURE);
1193
1194         memset(checker_msg, 0, MAX_CHECKER_MSG_SIZE);
1195         vecs = (struct vectors *)ap;
1196
1197         condlog(2, "path checkers start up");
1198
1199         /*
1200          * init the path check interval
1201          */
1202         vector_foreach_slot (vecs->pathvec, pp, i) {
1203                 pp->checkint = conf->checkint;
1204         }
1205
1206         while (1) {
1207                 pthread_cleanup_push(cleanup_lock, vecs->lock);
1208                 lock(vecs->lock);
1209                 condlog(4, "tick");
1210
1211                 vector_foreach_slot (vecs->pathvec, pp, i) {
1212                         if (!pp->mpp)
1213                                 continue;
1214
1215                         if (pp->tick && --pp->tick)
1216                                 continue; /* don't check this path yet */
1217
1218                         /*
1219                          * provision a next check soonest,
1220                          * in case we exit abnormaly from here
1221                          */
1222                         pp->tick = conf->checkint;
1223
1224                         if (!pp->checkfn) {
1225                                 pathinfo(pp, conf->hwtable, DI_SYSFS);
1226                                 select_checkfn(pp);
1227                         }
1228
1229                         if (!pp->checkfn) {
1230                                 condlog(0, "%s: checkfn is void", pp->dev);
1231                                 continue;
1232                         }
1233                         newstate = pp->checkfn(pp->fd, checker_msg,
1234                                                &pp->checker_context);
1235
1236                         if (newstate < 0) {
1237                                 condlog(2, "%s: unusable path", pp->dev);
1238                                 pathinfo(pp, conf->hwtable, 0);
1239                                 continue;
1240                         }
1241
1242                         if (newstate != pp->state) {
1243                                 pp->state = newstate;
1244                                 LOG_MSG(1, checker_msg);
1245
1246                                 /*
1247                                  * upon state change, reset the checkint
1248                                  * to the shortest delay
1249                                  */
1250                                 pp->checkint = conf->checkint;
1251
1252                                 if (newstate == PATH_DOWN ||
1253                                     newstate == PATH_SHAKY ||
1254                                     update_multipath_strings(pp->mpp,
1255                                                              vecs->pathvec)) {
1256                                         /*
1257                                          * proactively fail path in the DM
1258                                          */
1259                                         fail_path(pp);
1260
1261                                         /*
1262                                          * cancel scheduled failback
1263                                          */
1264                                         pp->mpp->failback_tick = 0;
1265
1266                                         continue;
1267                                 }
1268
1269                                 /*
1270                                  * reinstate this path
1271                                  */
1272                                 reinstate_path(pp);
1273
1274                                 /*
1275                                  * schedule [defered] failback
1276                                  */
1277                                 if (pp->mpp->pgfailback > 0)
1278                                         pp->mpp->failback_tick =
1279                                                 pp->mpp->pgfailback + 1;
1280                                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1281                                     need_switch_pathgroup(pp->mpp, 1))
1282                                         switch_pathgroup(pp->mpp);
1283
1284                                 /*
1285                                  * if at least one path is up in a group, and
1286                                  * the group is disabled, re-enable it
1287                                  */
1288                                 if (newstate == PATH_UP)
1289                                         enable_group(pp);
1290                         }
1291                         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1292                                 LOG_MSG(4, checker_msg);
1293                                 /*
1294                                  * double the next check delay.
1295                                  * max at conf->max_checkint
1296                                  */
1297                                 if (pp->checkint < (conf->max_checkint / 2))
1298                                         pp->checkint = 2 * pp->checkint;
1299                                 else
1300                                         pp->checkint = conf->max_checkint;
1301
1302                                 pp->tick = pp->checkint;
1303                                 condlog(4, "%s: delay next check %is",
1304                                                 pp->dev_t, pp->tick);
1305
1306                         }
1307                         pp->state = newstate;
1308
1309                         /*
1310                          * path prio refreshing
1311                          */
1312                         condlog(4, "path prio refresh");
1313                         pathinfo(pp, conf->hwtable, DI_PRIO);
1314
1315                         if (need_switch_pathgroup(pp->mpp, 0)) {
1316                                 if (pp->mpp->pgfailback > 0)
1317                                         pp->mpp->failback_tick =
1318                                                 pp->mpp->pgfailback + 1;
1319                                 else if (pp->mpp->pgfailback ==
1320                                                 -FAILBACK_IMMEDIATE)
1321                                         switch_pathgroup(pp->mpp);
1322                         }
1323                 }
1324                 defered_failback_tick(vecs->mpvec);
1325                 retry_count_tick(vecs->mpvec);
1326
1327                 if (count)
1328                         count--;
1329                 else {
1330                         condlog(4, "map garbage collection");
1331                         mpvec_garbage_collector(vecs);
1332                         count = MAPGCINT;
1333                 }
1334
1335                 lock_cleanup_pop(vecs->lock);
1336                 sleep(1);
1337         }
1338         return NULL;
1339 }
1340
1341 static struct vectors *
1342 init_vecs (void)
1343 {
1344         struct vectors * vecs;
1345
1346         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1347
1348         if (!vecs)
1349                 return NULL;
1350
1351         vecs->lock =
1352                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1353
1354         if (!vecs->lock)
1355                 goto out;
1356
1357         vecs->pathvec = vector_alloc();
1358
1359         if (!vecs->pathvec)
1360                 goto out1;
1361
1362         vecs->mpvec = vector_alloc();
1363
1364         if (!vecs->mpvec)
1365                 goto out2;
1366
1367         pthread_mutex_init(vecs->lock, NULL);
1368
1369         return vecs;
1370
1371 out2:
1372         vector_free(vecs->pathvec);
1373 out1:
1374         FREE(vecs->lock);
1375 out:
1376         FREE(vecs);
1377         condlog(0, "failed to init paths");
1378         return NULL;
1379 }
1380
1381 static void *
1382 signal_set(int signo, void (*func) (int))
1383 {
1384         int r;
1385         struct sigaction sig;
1386         struct sigaction osig;
1387
1388         sig.sa_handler = func;
1389         sigemptyset(&sig.sa_mask);
1390         sig.sa_flags = 0;
1391
1392         r = sigaction(signo, &sig, &osig);
1393
1394         if (r < 0)
1395                 return (SIG_ERR);
1396         else
1397                 return (osig.sa_handler);
1398 }
1399
1400 static void
1401 sighup (int sig)
1402 {
1403         condlog(3, "SIGHUP received");
1404
1405 #ifdef _DEBUG_
1406         dbg_free_final(NULL);
1407 #endif
1408 }
1409
1410 static void
1411 sigend (int sig)
1412 {
1413         exit_daemon(0);
1414 }
1415
1416 static void
1417 signal_init(void)
1418 {
1419         signal_set(SIGHUP, sighup);
1420         signal_set(SIGINT, sigend);
1421         signal_set(SIGTERM, sigend);
1422         signal_set(SIGKILL, sigend);
1423 }
1424
1425 static void
1426 setscheduler (void)
1427 {
1428         int res;
1429         static struct sched_param sched_param = {
1430                 sched_priority: 99
1431         };
1432
1433         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1434
1435         if (res == -1)
1436                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1437         return;
1438 }
1439
1440 static void
1441 set_oom_adj (int val)
1442 {
1443         FILE *fp;
1444
1445         fp = fopen("/proc/self/oom_adj", "w");
1446
1447         if (!fp)
1448                 return;
1449
1450         fprintf(fp, "%i", val);
1451         fclose(fp);
1452 }
1453
1454 static int
1455 child (void * param)
1456 {
1457         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1458         pthread_attr_t attr;
1459         struct vectors * vecs;
1460
1461         mlockall(MCL_CURRENT | MCL_FUTURE);
1462
1463         if (logsink)
1464                 log_thread_start();
1465
1466         condlog(2, "--------start up--------");
1467         condlog(2, "read " DEFAULT_CONFIGFILE);
1468
1469         if (load_config(DEFAULT_CONFIGFILE))
1470                 exit(1);
1471
1472         setlogmask(LOG_UPTO(conf->verbosity + 3));
1473
1474         /*
1475          * fill the voids left in the config file
1476          */
1477         if (!conf->checkint) {
1478                 conf->checkint = CHECKINT;
1479                 conf->max_checkint = MAX_CHECKINT;
1480         }
1481
1482         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1483                 if (logsink)
1484                         log_thread_stop();
1485
1486                 exit(1);
1487         }
1488         signal_init();
1489         setscheduler();
1490         set_oom_adj(-17);
1491         vecs = init_vecs();
1492
1493         if (!vecs)
1494                 exit(1);
1495
1496         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
1497                 condlog(0, "can not find sysfs mount point");
1498                 exit(1);
1499         }
1500
1501         /*
1502          * fetch paths and multipaths lists
1503          * no paths and/or no multipaths are valid scenarii
1504          * vectors maintenance will be driven by events
1505          */
1506         path_discovery(vecs->pathvec, conf, DI_SYSFS | DI_WWID | DI_CHECKER);
1507         map_discovery(vecs);
1508
1509         /*
1510          * start threads
1511          */
1512         pthread_attr_init(&attr);
1513         pthread_attr_setstacksize(&attr, 64 * 1024);
1514         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
1515
1516         pthread_create(&check_thr, &attr, checkerloop, vecs);
1517         pthread_create(&uevent_thr, &attr, ueventloop, vecs);
1518         pthread_create(&uxlsnr_thr, &attr, uxlsnrloop, vecs);
1519
1520         pthread_cond_wait(&exit_cond, &exit_mutex);
1521
1522         /*
1523          * exit path
1524          */
1525         lock(vecs->lock);
1526         remove_maps(vecs);
1527         free_pathvec(vecs->pathvec, FREE_PATHS);
1528
1529         pthread_cancel(check_thr);
1530         pthread_cancel(uevent_thr);
1531         pthread_cancel(uxlsnr_thr);
1532
1533         free_keys(keys);
1534         keys = NULL;
1535         free_handlers(handlers);
1536         handlers = NULL;
1537         free_polls();
1538
1539         unlock(vecs->lock);
1540         pthread_mutex_destroy(vecs->lock);
1541         FREE(vecs->lock);
1542         vecs->lock = NULL;
1543         FREE(vecs);
1544         vecs = NULL;
1545         free_config(conf);
1546         conf = NULL;
1547
1548         condlog(2, "--------shut down-------");
1549
1550         if (logsink)
1551                 log_thread_stop();
1552
1553         dm_lib_release();
1554         dm_lib_exit();
1555
1556 #ifdef _DEBUG_
1557         dbg_free_final(NULL);
1558 #endif
1559
1560         exit(0);
1561 }
1562
1563 static int
1564 daemonize(void)
1565 {
1566         int pid;
1567         int in_fd, out_fd;
1568
1569         if( (pid = fork()) < 0){
1570                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1571                 return -1;
1572         }
1573         else if (pid != 0)
1574                 return pid;
1575
1576         setsid();
1577
1578         if ( (pid = fork()) < 0)
1579                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1580         else if (pid != 0)
1581                 _exit(0);
1582
1583         in_fd = open("/dev/null", O_RDONLY);
1584         if (in_fd < 0){
1585                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1586                         strerror(errno));
1587                 _exit(0);
1588         }
1589         out_fd = open("/dev/console", O_WRONLY);
1590         if (out_fd < 0){
1591                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1592                         strerror(errno));
1593                 _exit(0);
1594         }
1595
1596         close(STDIN_FILENO);
1597         dup(in_fd);
1598         close(STDOUT_FILENO);
1599         dup(out_fd);
1600         close(STDERR_FILENO);
1601         dup(out_fd);
1602
1603         close(in_fd);
1604         close(out_fd);
1605         chdir("/");
1606         umask(0);
1607         return 0;
1608 }
1609
1610 int
1611 main (int argc, char *argv[])
1612 {
1613         extern char *optarg;
1614         extern int optind;
1615         int arg;
1616         int err;
1617
1618         logsink = 1;
1619
1620         if (getuid() != 0) {
1621                 fprintf(stderr, "need to be root\n");
1622                 exit(1);
1623         }
1624
1625         /* make sure we don't lock any path */
1626         chdir("/");
1627         umask(umask(077) | 022);
1628
1629         conf = alloc_config();
1630
1631         if (!conf)
1632                 exit(1);
1633
1634         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1635         switch(arg) {
1636                 case 'd':
1637                         logsink = 0;
1638                         //debug=1; /* ### comment me out ### */
1639                         break;
1640                 case 'v':
1641                         if (sizeof(optarg) > sizeof(char *) ||
1642                             !isdigit(optarg[0]))
1643                                 exit(1);
1644
1645                         conf->verbosity = atoi(optarg);
1646                         break;
1647                 case 'k':
1648                         uxclnt(optarg);
1649                         exit(0);
1650                 default:
1651                         ;
1652                 }
1653         }
1654
1655         if (!logsink)
1656                 err = 0;
1657         else
1658                 err = daemonize();
1659
1660         if (err < 0)
1661                 /* error */
1662                 exit(1);
1663         else if (err > 0)
1664                 /* parent dies */
1665                 exit(0);
1666         else
1667                 /* child lives */
1668                 return (child(NULL));
1669 }