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
 172         if (pp->fd >= 0)
 173                 close(pp->fd);
 174
 175         pp->fd = -1;
 176 }
 177
 178 static void
 179 orphan_paths (struct vectors * vecs, struct multipath * mpp)
 180 {
 181         int i;
 182         struct path * pp;
 183
 184         vector_foreach_slot (vecs->pathvec, pp, i) {
 185                 if (pp->mpp == mpp) {
 186                         condlog(4, "%s is orphaned", pp->dev_t);
 187                         orphan_path(pp);
 188                 }
 189         }
 190 }
 191
 192 static int
 193 update_multipath_table (struct multipath *mpp, vector pathvec)
 194 {
 195         if (!mpp)
 196                 return 1;
 197
 198         if (dm_get_map(mpp->alias, &mpp->size, mpp->params))
 199                 return 1;
 200
 201         if (disassemble_map(pathvec, mpp->params, mpp))
 202                 return 1;
 203
 204         return 0;
 205 }
 206
 207 static int
 208 update_multipath_status (struct multipath *mpp)
 209 {
 210         if (!mpp)
 211                 return 1;
 212
 213         if(dm_get_status(mpp->alias, mpp->status))
 214                 return 1;
 215
 216         if (disassemble_status(mpp->status, mpp))
 217                 return 1;
 218
 219         return 0;
 220 }
 221
 222 static int
 223 update_multipath_strings (struct multipath *mpp, vector pathvec)
 224 {
 225         if (mpp->selector) {
 226                 FREE(mpp->selector);
 227                 mpp->selector = NULL;
 228         }
 229
 230         if (mpp->features) {
 231                 FREE(mpp->features);
 232                 mpp->features = NULL;
 233         }
 234
 235         if (mpp->hwhandler) {
 236                 FREE(mpp->hwhandler);
 237                 mpp->hwhandler = NULL;
 238         }
 239
 240         free_pgvec(mpp->pg, KEEP_PATHS);
 241         mpp->pg = NULL;
 242
 243         if (update_multipath_table(mpp, pathvec))
 244                 return 1;
 245
 246         if (update_multipath_status(mpp))
 247                 return 1;
 248
 249         return 0;
 250 }
 251
 252 static void
 253 set_multipath_wwid (struct multipath * mpp)
 254 {
 255         if (mpp->wwid)
 256                 return;
 257
 258         dm_get_uuid(mpp->alias, mpp->wwid);
 259 }
 260
 261 static int
 262 pathcount (struct multipath *mpp, int state)
 263 {
 264         struct pathgroup *pgp;
 265         struct path *pp;
 266         int i, j;
 267         int count = 0;
 268
 269         vector_foreach_slot (mpp->pg, pgp, i)
 270                 vector_foreach_slot (pgp->paths, pp, j)
 271                         if (pp->state == state)
 272                                 count++;
 273         return count;
 274 }
 275
 276 /*
 277  * mpp->no_path_retry:
 278  *   -2 (QUEUE) : queue_if_no_path enabled, never turned off
 279  *   -1 (FAIL)  : fail_if_no_path
 280  *    0 (UNDEF) : nothing
 281  *   >0         : queue_if_no_path enabled, turned off after polling n times
 282  */
 283 static void
 284 update_queue_mode_del_path(struct multipath *mpp)
 285 {
 286         if (--mpp->nr_active == 0 && mpp->no_path_retry > 0) {
 287                 /*
 288                  * Enter retry mode.
 289                  * meaning of +1: retry_tick may be decremented in
 290                  *                checkerloop before starting retry.
 291                  */
 292                 mpp->retry_tick = mpp->no_path_retry * conf->checkint + 1;
 293                 condlog(1, "%s: Entering recovery mode: max_retries=%d",
 294                         mpp->alias, mpp->no_path_retry);
 295         }
 296         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 297 }
 298
 299 static void
 300 update_queue_mode_add_path(struct multipath *mpp)
 301 {
 302         if (mpp->nr_active++ == 0 && mpp->no_path_retry > 0) {
 303                 /* come back to normal mode from retry mode */
 304                 mpp->retry_tick = 0;
 305                 dm_queue_if_no_path(mpp->alias, 1);
 306                 condlog(2, "%s: queue_if_no_path enabled", mpp->alias);
 307                 condlog(1, "%s: Recovered to normal mode", mpp->alias);
 308         }
 309         condlog(2, "%s: remaining active paths: %d", mpp->alias, mpp->nr_active);
 310 }
 311
 312 static void
 313 set_no_path_retry(struct multipath *mpp)
 314 {
 315         mpp->retry_tick = 0;
 316         mpp->nr_active = pathcount(mpp, PATH_UP);
 317         select_no_path_retry(mpp);
 318
 319         switch (mpp->no_path_retry) {
 320         case NO_PATH_RETRY_UNDEF:
 321                 break;
 322         case NO_PATH_RETRY_FAIL:
 323                 dm_queue_if_no_path(mpp->alias, 0);
 324                 break;
 325         case NO_PATH_RETRY_QUEUE:
 326                 dm_queue_if_no_path(mpp->alias, 1);
 327                 break;
 328         default:
 329                 dm_queue_if_no_path(mpp->alias, 1);
 330                 if (mpp->nr_active == 0) {
 331                         /* Enter retry mode */
 332                         mpp->retry_tick = mpp->no_path_retry * conf->checkint;
 333                         condlog(1, "%s: Entering recovery mode: max_retries=%d",
 334                                 mpp->alias, mpp->no_path_retry);
 335                 }
 336                 break;
 337         }
 338 }
 339
 340 static struct hwentry *
 341 extract_hwe_from_path(struct multipath * mpp)
 342 {
 343         struct path * pp;
 344         struct pathgroup * pgp;
 345
 346         pgp = VECTOR_SLOT(mpp->pg, 0);
 347         pp = VECTOR_SLOT(pgp->paths, 0);
 348
 349         return pp->hwe;
 350 }
 351
 352 static void
 353 remove_map (struct multipath * mpp, struct vectors * vecs)
 354 {
 355         int i;
 356
 357         stop_waiter_thread(mpp, vecs);
 358
 359         /*
 360          * clear references to this map
 361          */
 362         orphan_paths(vecs, mpp);
 363
 364         /*
 365          * purge the multipath vector
 366          */
 367         i = find_slot(vecs->mpvec, (void *)mpp);
 368         vector_del_slot(vecs->mpvec, i);
 369
 370         /*
 371          * final free
 372          */
 373         free_multipath(mpp, KEEP_PATHS);
 374         mpp = NULL;
 375 }
 376
 377 static void
 378 remove_maps (struct vectors * vecs)
 379 {
 380         int i;
 381         struct multipath * mpp;
 382
 383         vector_foreach_slot (vecs->mpvec, mpp, i) {
 384                 remove_map(mpp, vecs);
 385                 i--;
 386         }
 387
 388         vector_free(vecs->mpvec);
 389         vecs->mpvec = NULL;
 390 }
 391
 392 static int
 393 setup_multipath (struct vectors * vecs, struct multipath * mpp)
 394 {
 395         if (dm_get_info(mpp->alias, &mpp->dmi))
 396                 goto out;
 397
 398         set_multipath_wwid(mpp);
 399         mpp->mpe = find_mpe(mpp->wwid);
 400         condlog(4, "discovered map %s", mpp->alias);
 401
 402         if (update_multipath_strings(mpp, vecs->pathvec))
 403                 goto out;
 404
 405         adopt_paths(vecs, mpp);
 406         mpp->hwe = extract_hwe_from_path(mpp);
 407         select_pgfailback(mpp);
 408         set_no_path_retry(mpp);
 409
 410         return 0;
 411 out:
 412         condlog(0, "%s: failed to setup multipath", mpp->alias);
 413         remove_map(mpp, vecs);
 414         return 1;
 415 }
 416
 417 static int
 418 need_switch_pathgroup (struct multipath * mpp, int refresh)
 419 {
 420         struct pathgroup * pgp;
 421         struct path * pp;
 422         int i, j;
 423
 424         if (!mpp || mpp->pgfailback == -FAILBACK_MANUAL)
 425                 return 0;
 426
 427         /*
 428          * Refresh path priority values
 429          */
 430         if (refresh)
 431                 vector_foreach_slot (mpp->pg, pgp, i)
 432                         vector_foreach_slot (pgp->paths, pp, j)
 433                                 pathinfo(pp, conf->hwtable, DI_PRIO);
 434
 435         mpp->bestpg = select_path_group(mpp);
 436
 437         if (mpp->bestpg != mpp->nextpg)
 438                 return 1;
 439
 440         return 0;
 441 }
 442
 443 static void
 444 switch_pathgroup (struct multipath * mpp)
 445 {
 446         dm_switchgroup(mpp->alias, mpp->bestpg);
 447         condlog(2, "%s: switch to path group #%i",
 448                  mpp->alias, mpp->bestpg);
 449 }
 450
 451 static int
 452 update_multipath (struct vectors *vecs, char *mapname)
 453 {
 454         struct multipath *mpp;
 455         struct pathgroup  *pgp;
 456         struct path *pp;
 457         int i, j;
 458         int r = 1;
 459
 460         mpp = find_mp_by_alias(vecs->mpvec, mapname);
 461
 462         if (!mpp)
 463                 goto out;
 464
 465         free_pgvec(mpp->pg, KEEP_PATHS);
 466         mpp->pg = NULL;
 467
 468         if (setup_multipath(vecs, mpp))
 469                 goto out; /* mpp freed in setup_multipath */
 470
 471         /*
 472          * compare checkers states with DM states
 473          */
 474         vector_foreach_slot (mpp->pg, pgp, i) {
 475                 vector_foreach_slot (pgp->paths, pp, j) {
 476                         if (pp->dmstate != PSTATE_FAILED)
 477                                 continue;
 478
 479                         if (pp->state != PATH_DOWN) {
 480                                 condlog(2, "%s: mark as failed", pp->dev_t);
 481                                 pp->state = PATH_DOWN;
 482                                 update_queue_mode_del_path(mpp);
 483
 484                                 /*
 485                                  * if opportune,
 486                                  * schedule the next check earlier
 487                                  */
 488                                 if (pp->tick > conf->checkint)
 489                                         pp->tick = conf->checkint;
 490                         }
 491                 }
 492         }
 493         r = 0;
 494 out:
 495         if (r)
 496                 condlog(0, "failed to update multipath");
 497
 498         return r;
 499 }
 500
 501 static sigset_t unblock_sighup(void)
 502 {
 503         sigset_t set, old;
 504
 505         sigemptyset(&set);
 506         sigaddset(&set, SIGHUP);
 507         pthread_sigmask(SIG_UNBLOCK, &set, &old);
 508         return old;
 509 }
 510
 511 /*
 512  * returns the reschedule delay
 513  * negative means *stop*
 514  */
 515 static int
 516 waiteventloop (struct event_thread * waiter)
 517 {
 518         sigset_t set;
 519         int event_nr;
 520         int r;
 521
 522         if (!waiter->event_nr)
 523                 waiter->event_nr = dm_geteventnr(waiter->mapname);
 524
 525         if (!(waiter->dmt = dm_task_create(DM_DEVICE_WAITEVENT)))
 526                 return 1;
 527
 528         if (!dm_task_set_name(waiter->dmt, waiter->mapname)) {
 529                 dm_task_destroy(waiter->dmt);
 530                 return 1;
 531         }
 532
 533         if (waiter->event_nr && !dm_task_set_event_nr(waiter->dmt,
 534                                                       waiter->event_nr)) {
 535                 dm_task_destroy(waiter->dmt);
 536                 return 1;
 537         }
 538
 539         dm_task_no_open_count(waiter->dmt);
 540
 541         /* accept wait interruption */
 542         set = unblock_sighup();
 543
 544         /* interruption spits messages */
 545         dm_shut_log();
 546
 547         /* wait */
 548         r = dm_task_run(waiter->dmt);
 549
 550         /* wait is over : event or interrupt */
 551         pthread_sigmask(SIG_SETMASK, &set, NULL);
 552         //dm_restore_log();
 553
 554         if (!r) /* wait interrupted by signal */
 555                 return -1;
 556
 557         dm_task_destroy(waiter->dmt);
 558         waiter->dmt = NULL;
 559         waiter->event_nr++;
 560
 561         /*
 562          * upon event ...
 563          */
 564         while (1) {
 565                 condlog(3, "%s: devmap event #%i",
 566                                 waiter->mapname, waiter->event_nr);
 567
 568                 /*
 569                  * event might be :
 570                  *
 571                  * 1) a table reload, which means our mpp structure is
 572                  *    obsolete : refresh it through update_multipath()
 573                  * 2) a path failed by DM : mark as such through
 574                  *    update_multipath()
 575                  * 3) map has gone away : stop the thread.
 576                  * 4) a path reinstate : nothing to do
 577                  * 5) a switch group : nothing to do
 578                  */
 579                 pthread_cleanup_push(cleanup_lock, waiter->vecs->lock);
 580                 lock(waiter->vecs->lock);
 581                 r = update_multipath(waiter->vecs, waiter->mapname);
 582                 lock_cleanup_pop(waiter->vecs->lock);
 583
 584                 if (r)
 585                         return -1; /* stop the thread */
 586
 587                 event_nr = dm_geteventnr(waiter->mapname);
 588
 589                 if (waiter->event_nr == event_nr)
 590                         return 1; /* upon problem reschedule 1s later */
 591
 592                 waiter->event_nr = event_nr;
 593         }
 594         return -1; /* never reach there */
 595 }
 596
 597 static void *
 598 waitevent (void * et)
 599 {
 600         int r;
 601         struct event_thread *waiter;
 602
 603         mlockall(MCL_CURRENT | MCL_FUTURE);
 604
 605         waiter = (struct event_thread *)et;
 606         pthread_cleanup_push(free_waiter, et);
 607
 608         while (1) {
 609                 r = waiteventloop(waiter);
 610
 611                 if (r < 0)
 612                         break;
 613
 614                 sleep(r);
 615         }
 616
 617         pthread_cleanup_pop(1);
 618         return NULL;
 619 }
 620
 621 static int
 622 start_waiter_thread (struct multipath * mpp, struct vectors * vecs)
 623 {
 624         pthread_attr_t attr;
 625         struct event_thread * wp;
 626
 627         if (!mpp)
 628                 return 0;
 629
 630         if (pthread_attr_init(&attr))
 631                 goto out;
 632
 633         pthread_attr_setstacksize(&attr, 32 * 1024);
 634         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
 635
 636         wp = alloc_waiter();
 637
 638         if (!wp)
 639                 goto out;
 640
 641         mpp->waiter = (void *)wp;
 642         strncpy(wp->mapname, mpp->alias, WWID_SIZE);
 643         wp->vecs = vecs;
 644
 645         if (pthread_create(&wp->thread, &attr, waitevent, wp)) {
 646                 condlog(0, "%s: cannot create event checker", wp->mapname);
 647                 goto out1;
 648         }
 649         condlog(2, "%s: event checker started", wp->mapname);
 650
 651         return 0;
 652 out1:
 653         free_waiter(wp);
 654         mpp->waiter = NULL;
 655 out:
 656         condlog(0, "failed to start waiter thread");
 657         return 1;
 658 }
 659
 660 int
 661 uev_add_map (char * devname, struct vectors * vecs)
 662 {
 663         int major, minor;
 664         char dev_t[BLK_DEV_SIZE];
 665         char * alias;
 666         struct multipath * mpp;
 667
 668         if (sscanf(devname, "dm-%d", &minor) == 1 &&
 669             !sysfs_get_dev(sysfs_path, devname, dev_t, BLK_DEV_SIZE) &&
 670             sscanf(dev_t, "%d:%d", &major, &minor) == 2)
 671                 alias = dm_mapname(major, minor);
 672         else
 673                 alias = STRDUP(devname);
 674
 675         if (!alias)
 676                 return 1;
 677
 678         if (!dm_type(alias, DEFAULT_TARGET)) {
 679                 condlog(4, "%s: not a multipath map", alias);
 680                 FREE(alias);
 681                 return 0;
 682         }
 683
 684         mpp = find_mp_by_alias(vecs->mpvec, alias);
 685
 686         if (mpp) {
 687                 /*
 688                  * this should not happen,
 689                  * we missed a remove map event (not sent ?)
 690                  */
 691                 condlog(2, "%s: already registered", alias);
 692                 remove_map(mpp, vecs);
 693         }
 694
 695         /*
 696          * now we can allocate
 697          */
 698         mpp = alloc_multipath();
 699
 700         if (!mpp)
 701                 return 1;
 702
 703         mpp->alias = alias;
 704
 705         if (setup_multipath(vecs, mpp))
 706                 return 1; /* mpp freed in setup_multipath */
 707
 708         if (!vector_alloc_slot(vecs->mpvec))
 709                 goto out;
 710
 711         vector_set_slot(vecs->mpvec, mpp);
 712         adopt_paths(vecs, mpp);
 713
 714         if (start_waiter_thread(mpp, vecs))
 715                 goto out;
 716
 717         return 0;
 718 out:
 719         condlog(2, "%s: add devmap failed", mpp->alias);
 720         remove_map(mpp, vecs);
 721         return 1;
 722 }
 723
 724 int
 725 uev_remove_map (char * devname, struct vectors * vecs)
 726 {
 727         int minor;
 728         struct multipath * mpp;
 729
 730         if (sscanf(devname, "dm-%d", &minor) == 1)
 731                 mpp = find_mp_by_minor(vecs->mpvec, minor);
 732         else
 733                 mpp = find_mp_by_alias(vecs->mpvec, devname);
 734
 735         if (!mpp) {
 736                 condlog(3, "%s: devmap not registered, can't remove",
 737                         devname);
 738                 return 0;
 739         }
 740
 741         condlog(2, "remove %s devmap", mpp->alias);
 742         remove_map(mpp, vecs);
 743
 744         return 0;
 745 }
 746
 747 int
 748 uev_add_path (char * devname, struct vectors * vecs)
 749 {
 750         struct path * pp;
 751
 752         pp = find_path_by_dev(vecs->pathvec, devname);
 753
 754         if (pp) {
 755                 condlog(3, "%s: already in pathvec");
 756                 return 1;
 757         }
 758         pp = store_pathinfo(vecs->pathvec, conf->hwtable,
 759                        devname, DI_SYSFS | DI_WWID);
 760
 761         if (!pp) {
 762                 condlog(0, "%s: failed to store path info", devname);
 763                 return 1;
 764         }
 765
 766         condlog(2, "%s: path checker registered", devname);
 767         pp->mpp = find_mp_by_wwid(vecs->mpvec, pp->wwid);
 768
 769         if (pp->mpp) {
 770                 condlog(4, "%s: ownership set to %s",
 771                                 pp->dev_t, pp->mpp->alias);
 772         } else {
 773                 condlog(4, "%s: orphaned", pp->dev_t);
 774                 orphan_path(pp);
 775         }
 776
 777         return 0;
 778 }
 779
 780 int
 781 uev_remove_path (char * devname, struct vectors * vecs)
 782 {
 783         int i;
 784         struct path * pp;
 785
 786         pp = find_path_by_dev(vecs->pathvec, devname);
 787
 788         if (!pp) {
 789                 condlog(3, "%s: not in pathvec");
 790                 return 1;
 791         }
 792
 793         if (pp->mpp && pp->state == PATH_UP)
 794                 update_queue_mode_del_path(pp->mpp);
 795
 796         condlog(2, "remove %s path checker", devname);
 797         i = find_slot(vecs->pathvec, (void *)pp);
 798         vector_del_slot(vecs->pathvec, i);
 799         free_path(pp);
 800
 801         return 0;
 802 }
 803
 804 int
 805 show_paths (char ** r, int * len, struct vectors * vecs)
 806 {
 807         int i;
 808         struct path * pp;
 809         char * c;
 810         char * reply;
 811         struct path_layout pl;
 812
 813         get_path_layout(&pl, vecs->pathvec);
 814         reply = MALLOC(MAX_REPLY_LEN);
 815
 816         if (!reply)
 817                 return 1;
 818
 819         c = reply;
 820
 821         if (VECTOR_SIZE(vecs->pathvec) > 0)
 822                 c += snprint_path_header(c, reply + MAX_REPLY_LEN - c,
 823                                          PRINT_PATH_CHECKER, &pl);
 824
 825         vector_foreach_slot(vecs->pathvec, pp, i)
 826                 c += snprint_path(c, reply + MAX_REPLY_LEN - c,
 827                                   PRINT_PATH_CHECKER, pp, &pl);
 828
 829         *r = reply;
 830         *len = (int)(c - reply + 1);
 831         return 0;
 832 }
 833
 834 int
 835 show_maps (char ** r, int *len, struct vectors * vecs)
 836 {
 837         int i;
 838         struct multipath * mpp;
 839         char * c;
 840         char * reply;
 841         struct map_layout ml;
 842
 843         get_map_layout(&ml, vecs->mpvec);
 844         reply = MALLOC(MAX_REPLY_LEN);
 845
 846         if (!reply)
 847                 return 1;
 848
 849         c = reply;
 850         if (VECTOR_SIZE(vecs->mpvec) > 0)
 851                 c += snprint_map_header(c, reply + MAX_REPLY_LEN - c,
 852                                         PRINT_MAP_FAILBACK, &ml);
 853
 854         vector_foreach_slot(vecs->mpvec, mpp, i)
 855                 c += snprint_map(c, reply + MAX_REPLY_LEN - c,
 856                                  PRINT_MAP_FAILBACK, mpp, &ml);
 857
 858         *r = reply;
 859         *len = (int)(c - reply + 1);
 860         return 0;
 861 }
 862
 863 int
 864 dump_pathvec (char ** r, int * len, struct vectors * vecs)
 865 {
 866         int i;
 867         struct path * pp;
 868         char * reply;
 869         char * p;
 870
 871         *len = VECTOR_SIZE(vecs->pathvec) * sizeof(struct path);
 872         reply = (char *)MALLOC(*len);
 873         *r = reply;
 874
 875         if (!reply)
 876                 return 1;
 877
 878         p = reply;
 879
 880         vector_foreach_slot (vecs->pathvec, pp, i) {
 881                 memcpy((void *)p, pp, sizeof(struct path));
 882                 p += sizeof(struct path);
 883         }
 884
 885         /* return negative to hint caller not to add "ok" to the dump */
 886         return -1;
 887 }
 888
 889 static int
 890 map_discovery (struct vectors * vecs)
 891 {
 892         int i;
 893         struct multipath * mpp;
 894
 895         if (dm_get_maps(vecs->mpvec, "multipath"))
 896                 return 1;
 897
 898         vector_foreach_slot (vecs->mpvec, mpp, i) {
 899                 if (setup_multipath(vecs, mpp))
 900                         return 1;
 901                 start_waiter_thread(mpp, vecs);
 902         }
 903
 904         return 0;
 905 }
 906
 907 int
 908 reconfigure (struct vectors * vecs)
 909 {
 910         struct config * old = conf;
 911         struct multipath * mpp;
 912         struct path * pp;
 913         int i;
 914
 915         conf = NULL;
 916
 917         if (load_config(DEFAULT_CONFIGFILE)) {
 918                 conf = old;
 919                 condlog(2, "reconfigure failed, continue with old config");
 920                 return 1;
 921         }
 922         conf->verbosity = old->verbosity;
 923         free_config(old);
 924
 925         vector_foreach_slot (vecs->mpvec, mpp, i) {
 926                 mpp->mpe = find_mpe(mpp->wwid);
 927                 mpp->hwe = extract_hwe_from_path(mpp);
 928                 adopt_paths(vecs, mpp);
 929                 set_no_path_retry(mpp);
 930         }
 931         vector_foreach_slot (vecs->pathvec, pp, i) {
 932                 select_checkfn(pp);
 933                 select_getuid(pp);
 934                 select_getprio(pp);
 935         }
 936         condlog(2, "reconfigured");
 937         return 0;
 938 }
 939
 940 int
 941 uxsock_trigger (char * str, char ** reply, int * len, void * trigger_data)
 942 {
 943         struct vectors * vecs;
 944         int r;
 945
 946         *reply = NULL;
 947         *len = 0;
 948         vecs = (struct vectors *)trigger_data;
 949
 950         pthread_cleanup_push(cleanup_lock, vecs->lock);
 951         lock(vecs->lock);
 952
 953         r = parse_cmd(str, reply, len, vecs);
 954
 955         if (r > 0) {
 956                 *reply = STRDUP("fail\n");
 957                 *len = strlen(*reply) + 1;
 958                 r = 1;
 959         }
 960         else if (!r && *len == 0) {
 961                 *reply = STRDUP("ok\n");
 962                 *len = strlen(*reply) + 1;
 963                 r = 0;
 964         }
 965         /* else if (r < 0) leave *reply alone */
 966
 967         lock_cleanup_pop(vecs->lock);
 968         return r;
 969 }
 970
 971 static int
 972 uev_discard(char * devpath)
 973 {
 974         char a[10], b[10];
 975
 976         /*
 977          * keep only block devices, discard partitions
 978          */
 979         if (sscanf(devpath, "/block/%10s", a) != 1 ||
 980             sscanf(devpath, "/block/%10[^/]/%10s", a, b) == 2) {
 981                 condlog(4, "discard event on %s", devpath);
 982                 return 1;
 983         }
 984         return 0;
 985 }
 986
 987 int
 988 uev_trigger (struct uevent * uev, void * trigger_data)
 989 {
 990         int r = 0;
 991         char devname[32];
 992         struct vectors * vecs;
 993
 994         vecs = (struct vectors *)trigger_data;
 995
 996         if (uev_discard(uev->devpath))
 997                 return 1;
 998
 999         basename(uev->devpath, devname);
1000         lock(vecs->lock);
1001
1002         /*
1003          * device map add/remove event
1004          */
1005         if (!strncmp(devname, "dm-", 3)) {
1006                 if (!strncmp(uev->action, "add", 3)) {
1007                         r = uev_add_map(devname, vecs);
1008                         goto out;
1009                 }
1010 #if 0
1011                 if (!strncmp(uev->action, "remove", 6)) {
1012                         r = uev_remove_map(devname, vecs);
1013                         goto out;
1014                 }
1015 #endif
1016                 goto out;
1017         }
1018
1019         /*
1020          * path add/remove event
1021          */
1022         if (blacklist(conf->blist, devname))
1023                 goto out;
1024
1025         if (!strncmp(uev->action, "add", 3)) {
1026                 r = uev_add_path(devname, vecs);
1027                 goto out;
1028         }
1029         if (!strncmp(uev->action, "remove", 6)) {
1030                 r = uev_remove_path(devname, vecs);
1031                 goto out;
1032         }
1033
1034 out:
1035         unlock(vecs->lock);
1036         return r;
1037 }
1038
1039 static void *
1040 ueventloop (void * ap)
1041 {
1042         if (uevent_listen(&uev_trigger, ap))
1043                 fprintf(stderr, "error starting uevent listener");
1044
1045         return NULL;
1046 }
1047
1048 static void *
1049 uxlsnrloop (void * ap)
1050 {
1051         if (load_keys())
1052                 return NULL;
1053
1054         if (alloc_handlers())
1055                 return NULL;
1056
1057         add_handler(LIST+PATHS, cli_list_paths);
1058         add_handler(LIST+MAPS, cli_list_maps);
1059         add_handler(ADD+PATH, cli_add_path);
1060         add_handler(DEL+PATH, cli_del_path);
1061         add_handler(ADD+MAP, cli_add_map);
1062         add_handler(DEL+MAP, cli_del_map);
1063         add_handler(SWITCH+MAP+GROUP, cli_switch_group);
1064         add_handler(DUMP+PATHVEC, cli_dump_pathvec);
1065         add_handler(RECONFIGURE, cli_reconfigure);
1066         add_handler(SUSPEND+MAP, cli_suspend);
1067         add_handler(RESUME+MAP, cli_resume);
1068         add_handler(REINSTATE+PATH, cli_reinstate);
1069         add_handler(FAIL+PATH, cli_fail);
1070
1071         uxsock_listen(&uxsock_trigger, ap);
1072
1073         return NULL;
1074 }
1075
1076 static int
1077 exit_daemon (int status)
1078 {
1079         if (status != 0)
1080                 fprintf(stderr, "bad exit status. see daemon.log\n");
1081
1082         condlog(3, "unlink pidfile");
1083         unlink(DEFAULT_PIDFILE);
1084
1085         lock(&exit_mutex);
1086         pthread_cond_signal(&exit_cond);
1087         unlock(&exit_mutex);
1088
1089         return status;
1090 }
1091
1092 static void
1093 fail_path (struct path * pp)
1094 {
1095         if (!pp->mpp)
1096                 return;
1097
1098         condlog(2, "checker failed path %s in map %s",
1099                  pp->dev_t, pp->mpp->alias);
1100
1101         dm_fail_path(pp->mpp->alias, pp->dev_t);
1102         update_queue_mode_del_path(pp->mpp);
1103 }
1104
1105 /*
1106  * caller must have locked the path list before calling that function
1107  */
1108 static void
1109 reinstate_path (struct path * pp)
1110 {
1111         if (!pp->mpp)
1112                 return;
1113
1114         if (dm_reinstate_path(pp->mpp->alias, pp->dev_t))
1115                 condlog(0, "%s: reinstate failed", pp->dev_t);
1116         else {
1117                 condlog(2, "%s: reinstated", pp->dev_t);
1118                 update_queue_mode_add_path(pp->mpp);
1119         }
1120 }
1121
1122 static void
1123 enable_group(struct path * pp)
1124 {
1125         struct pathgroup * pgp;
1126
1127         /*
1128          * if path is added through uev_add_path, pgindex can be unset.
1129          * next update_strings() will set it, upon map reload event.
1130          *
1131          * we can safely return here, because upon map reload, all
1132          * PG will be enabled.
1133          */
1134         if (!pp->mpp->pg || !pp->pgindex)
1135                 return;
1136
1137         pgp = VECTOR_SLOT(pp->mpp->pg, pp->pgindex - 1);
1138
1139         if (pgp->status == PGSTATE_DISABLED) {
1140                 condlog(2, "%s: enable group #%i", pp->mpp->alias, pp->pgindex);
1141                 dm_enablegroup(pp->mpp->alias, pp->pgindex);
1142         }
1143 }
1144
1145 static void
1146 mpvec_garbage_collector (struct vectors * vecs)
1147 {
1148         struct multipath * mpp;
1149         int i;
1150
1151         vector_foreach_slot (vecs->mpvec, mpp, i) {
1152                 if (mpp && mpp->alias && !dm_map_present(mpp->alias)) {
1153                         condlog(2, "%s: remove dead map", mpp->alias);
1154                         remove_map(mpp, vecs);
1155                         i--;
1156                 }
1157         }
1158 }
1159
1160 static void
1161 defered_failback_tick (vector mpvec)
1162 {
1163         struct multipath * mpp;
1164         int i;
1165
1166         vector_foreach_slot (mpvec, mpp, i) {
1167                 /*
1168                  * defered failback getting sooner
1169                  */
1170                 if (mpp->pgfailback > 0 && mpp->failback_tick > 0) {
1171                         mpp->failback_tick--;
1172
1173                         if (!mpp->failback_tick && need_switch_pathgroup(mpp, 1))
1174                                 switch_pathgroup(mpp);
1175                 }
1176         }
1177 }
1178
1179 static void
1180 retry_count_tick(vector mpvec)
1181 {
1182         struct multipath *mpp;
1183         int i;
1184
1185         vector_foreach_slot (mpvec, mpp, i) {
1186                 if (mpp->retry_tick) {
1187                         condlog(4, "%s: Retrying.. No active path", mpp->alias);
1188                         if(--mpp->retry_tick == 0) {
1189                                 dm_queue_if_no_path(mpp->alias, 0);
1190                                 condlog(2, "%s: Disable queueing", mpp->alias);
1191                         }
1192                 }
1193         }
1194 }
1195
1196 static void *
1197 checkerloop (void *ap)
1198 {
1199         struct vectors *vecs;
1200         struct path *pp;
1201         int i, count = 0;
1202         int newstate;
1203         char checker_msg[MAX_CHECKER_MSG_SIZE];
1204
1205         mlockall(MCL_CURRENT | MCL_FUTURE);
1206
1207         memset(checker_msg, 0, MAX_CHECKER_MSG_SIZE);
1208         vecs = (struct vectors *)ap;
1209
1210         condlog(2, "path checkers start up");
1211
1212         /*
1213          * init the path check interval
1214          */
1215         vector_foreach_slot (vecs->pathvec, pp, i) {
1216                 pp->checkint = conf->checkint;
1217         }
1218
1219         while (1) {
1220                 pthread_cleanup_push(cleanup_lock, vecs->lock);
1221                 lock(vecs->lock);
1222                 condlog(4, "tick");
1223
1224                 vector_foreach_slot (vecs->pathvec, pp, i) {
1225                         if (!pp->mpp)
1226                                 continue;
1227
1228                         if (pp->tick && --pp->tick)
1229                                 continue; /* don't check this path yet */
1230
1231                         /*
1232                          * provision a next check soonest,
1233                          * in case we exit abnormaly from here
1234                          */
1235                         pp->tick = conf->checkint;
1236
1237                         if (!pp->checkfn) {
1238                                 pathinfo(pp, conf->hwtable, DI_SYSFS);
1239                                 select_checkfn(pp);
1240                         }
1241
1242                         if (!pp->checkfn) {
1243                                 condlog(0, "%s: checkfn is void", pp->dev);
1244                                 continue;
1245                         }
1246                         newstate = pp->checkfn(pp->fd, checker_msg,
1247                                                &pp->checker_context);
1248
1249                         if (newstate < 0) {
1250                                 condlog(2, "%s: unusable path", pp->dev);
1251                                 pathinfo(pp, conf->hwtable, 0);
1252                                 continue;
1253                         }
1254
1255                         if (newstate != pp->state) {
1256                                 pp->state = newstate;
1257                                 LOG_MSG(1, checker_msg);
1258
1259                                 /*
1260                                  * upon state change, reset the checkint
1261                                  * to the shortest delay
1262                                  */
1263                                 pp->checkint = conf->checkint;
1264
1265                                 if (newstate == PATH_DOWN ||
1266                                     newstate == PATH_SHAKY ||
1267                                     update_multipath_strings(pp->mpp,
1268                                                              vecs->pathvec)) {
1269                                         /*
1270                                          * proactively fail path in the DM
1271                                          */
1272                                         fail_path(pp);
1273
1274                                         /*
1275                                          * cancel scheduled failback
1276                                          */
1277                                         pp->mpp->failback_tick = 0;
1278
1279                                         continue;
1280                                 }
1281
1282                                 /*
1283                                  * reinstate this path
1284                                  */
1285                                 reinstate_path(pp);
1286
1287                                 /*
1288                                  * schedule [defered] failback
1289                                  */
1290                                 if (pp->mpp->pgfailback > 0)
1291                                         pp->mpp->failback_tick =
1292                                                 pp->mpp->pgfailback + 1;
1293                                 else if (pp->mpp->pgfailback == -FAILBACK_IMMEDIATE &&
1294                                     need_switch_pathgroup(pp->mpp, 1))
1295                                         switch_pathgroup(pp->mpp);
1296
1297                                 /*
1298                                  * if at least one path is up in a group, and
1299                                  * the group is disabled, re-enable it
1300                                  */
1301                                 if (newstate == PATH_UP)
1302                                         enable_group(pp);
1303                         }
1304                         else if (newstate == PATH_UP || newstate == PATH_GHOST) {
1305                                 LOG_MSG(4, checker_msg);
1306                                 /*
1307                                  * double the next check delay.
1308                                  * max at conf->max_checkint
1309                                  */
1310                                 if (pp->checkint < (conf->max_checkint / 2))
1311                                         pp->checkint = 2 * pp->checkint;
1312                                 else
1313                                         pp->checkint = conf->max_checkint;
1314
1315                                 pp->tick = pp->checkint;
1316                                 condlog(4, "%s: delay next check %is",
1317                                                 pp->dev_t, pp->tick);
1318
1319                         }
1320                         pp->state = newstate;
1321
1322                         /*
1323                          * path prio refreshing
1324                          */
1325                         condlog(4, "path prio refresh");
1326                         pathinfo(pp, conf->hwtable, DI_PRIO);
1327
1328                         if (need_switch_pathgroup(pp->mpp, 0)) {
1329                                 if (pp->mpp->pgfailback > 0)
1330                                         pp->mpp->failback_tick =
1331                                                 pp->mpp->pgfailback + 1;
1332                                 else if (pp->mpp->pgfailback ==
1333                                                 -FAILBACK_IMMEDIATE)
1334                                         switch_pathgroup(pp->mpp);
1335                         }
1336                 }
1337                 defered_failback_tick(vecs->mpvec);
1338                 retry_count_tick(vecs->mpvec);
1339
1340                 if (count)
1341                         count--;
1342                 else {
1343                         condlog(4, "map garbage collection");
1344                         mpvec_garbage_collector(vecs);
1345                         count = MAPGCINT;
1346                 }
1347
1348                 lock_cleanup_pop(vecs->lock);
1349                 sleep(1);
1350         }
1351         return NULL;
1352 }
1353
1354 static struct vectors *
1355 init_paths (void)
1356 {
1357         struct vectors * vecs;
1358
1359         vecs = (struct vectors *)MALLOC(sizeof(struct vectors));
1360
1361         if (!vecs)
1362                 return NULL;
1363
1364         vecs->lock =
1365                 (pthread_mutex_t *)MALLOC(sizeof(pthread_mutex_t));
1366
1367         if (!vecs->lock)
1368                 goto out;
1369
1370         vecs->pathvec = vector_alloc();
1371
1372         if (!vecs->pathvec)
1373                 goto out1;
1374
1375         vecs->mpvec = vector_alloc();
1376
1377         if (!vecs->mpvec)
1378                 goto out2;
1379
1380         pthread_mutex_init(vecs->lock, NULL);
1381
1382         return vecs;
1383
1384 out2:
1385         vector_free(vecs->pathvec);
1386 out1:
1387         FREE(vecs->lock);
1388 out:
1389         FREE(vecs);
1390         condlog(0, "failed to init paths");
1391         return NULL;
1392 }
1393
1394 static void *
1395 signal_set(int signo, void (*func) (int))
1396 {
1397         int r;
1398         struct sigaction sig;
1399         struct sigaction osig;
1400
1401         sig.sa_handler = func;
1402         sigemptyset(&sig.sa_mask);
1403         sig.sa_flags = 0;
1404
1405         r = sigaction(signo, &sig, &osig);
1406
1407         if (r < 0)
1408                 return (SIG_ERR);
1409         else
1410                 return (osig.sa_handler);
1411 }
1412
1413 static void
1414 sighup (int sig)
1415 {
1416         condlog(3, "SIGHUP received");
1417
1418 #ifdef _DEBUG_
1419         dbg_free_final(NULL);
1420 #endif
1421 }
1422
1423 static void
1424 sigend (int sig)
1425 {
1426         exit_daemon(0);
1427 }
1428
1429 static void
1430 signal_init(void)
1431 {
1432         signal_set(SIGHUP, sighup);
1433         signal_set(SIGINT, sigend);
1434         signal_set(SIGTERM, sigend);
1435         signal_set(SIGKILL, sigend);
1436 }
1437
1438 static void
1439 setscheduler (void)
1440 {
1441         int res;
1442         static struct sched_param sched_param = {
1443                 sched_priority: 99
1444         };
1445
1446         res = sched_setscheduler (0, SCHED_RR, &sched_param);
1447
1448         if (res == -1)
1449                 condlog(LOG_WARNING, "Could not set SCHED_RR at priority 99");
1450         return;
1451 }
1452
1453 static void
1454 set_oom_adj (int val)
1455 {
1456         FILE *fp;
1457
1458         fp = fopen("/proc/self/oom_adj", "w");
1459
1460         if (!fp)
1461                 return;
1462
1463         fprintf(fp, "%i", val);
1464         fclose(fp);
1465 }
1466
1467 static int
1468 child (void * param)
1469 {
1470         pthread_t check_thr, uevent_thr, uxlsnr_thr;
1471         pthread_attr_t attr;
1472         struct vectors * vecs;
1473
1474         mlockall(MCL_CURRENT | MCL_FUTURE);
1475
1476         if (logsink)
1477                 log_thread_start();
1478
1479         condlog(2, "--------start up--------");
1480         condlog(2, "read " DEFAULT_CONFIGFILE);
1481
1482         if (load_config(DEFAULT_CONFIGFILE))
1483                 exit(1);
1484
1485         setlogmask(LOG_UPTO(conf->verbosity + 3));
1486
1487         /*
1488          * fill the voids left in the config file
1489          */
1490         if (!conf->checkint) {
1491                 conf->checkint = CHECKINT;
1492                 conf->max_checkint = MAX_CHECKINT;
1493         }
1494
1495         if (pidfile_create(DEFAULT_PIDFILE, getpid())) {
1496                 if (logsink)
1497                         log_thread_stop();
1498
1499                 exit(1);
1500         }
1501         signal_init();
1502         setscheduler();
1503         set_oom_adj(-17);
1504         vecs = init_paths();
1505
1506         if (!vecs)
1507                 exit(1);
1508
1509         if (sysfs_get_mnt_path(sysfs_path, FILE_NAME_SIZE)) {
1510                 condlog(0, "can not find sysfs mount point");
1511                 exit(1);
1512         }
1513
1514         /*
1515          * fetch paths and multipaths lists
1516          * no paths and/or no multipaths are valid scenarii
1517          * vectors maintenance will be driven by events
1518          */
1519         path_discovery(vecs->pathvec, conf, DI_SYSFS | DI_WWID | DI_CHECKER);
1520         map_discovery(vecs);
1521
1522         /*
1523          * start threads
1524          */
1525         pthread_attr_init(&attr);
1526         pthread_attr_setstacksize(&attr, 64 * 1024);
1527         pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
1528
1529         pthread_create(&check_thr, &attr, checkerloop, vecs);
1530         pthread_create(&uevent_thr, &attr, ueventloop, vecs);
1531         pthread_create(&uxlsnr_thr, &attr, uxlsnrloop, vecs);
1532
1533         pthread_cond_wait(&exit_cond, &exit_mutex);
1534
1535         /*
1536          * exit path
1537          */
1538         lock(vecs->lock);
1539         remove_maps(vecs);
1540         free_pathvec(vecs->pathvec, FREE_PATHS);
1541
1542         pthread_cancel(check_thr);
1543         pthread_cancel(uevent_thr);
1544         pthread_cancel(uxlsnr_thr);
1545
1546         free_keys(keys);
1547         keys = NULL;
1548         free_handlers(handlers);
1549         handlers = NULL;
1550         free_polls();
1551
1552         unlock(vecs->lock);
1553         pthread_mutex_destroy(vecs->lock);
1554         FREE(vecs->lock);
1555         vecs->lock = NULL;
1556         FREE(vecs);
1557         vecs = NULL;
1558         free_config(conf);
1559         conf = NULL;
1560
1561         condlog(2, "--------shut down-------");
1562
1563         if (logsink)
1564                 log_thread_stop();
1565
1566 #ifdef _DEBUG_
1567         dbg_free_final(NULL);
1568 #endif
1569
1570         exit(0);
1571 }
1572
1573 static int
1574 daemonize(void)
1575 {
1576         int pid;
1577         int in_fd, out_fd;
1578
1579         if( (pid = fork()) < 0){
1580                 fprintf(stderr, "Failed first fork : %s\n", strerror(errno));
1581                 return -1;
1582         }
1583         else if (pid != 0)
1584                 return pid;
1585
1586         setsid();
1587
1588         if ( (pid = fork()) < 0)
1589                 fprintf(stderr, "Failed second fork : %s\n", strerror(errno));
1590         else if (pid != 0)
1591                 _exit(0);
1592
1593         in_fd = open("/dev/null", O_RDONLY);
1594         if (in_fd < 0){
1595                 fprintf(stderr, "cannot open /dev/null for input : %s\n",
1596                         strerror(errno));
1597                 _exit(0);
1598         }
1599         out_fd = open("/dev/console", O_WRONLY);
1600         if (out_fd < 0){
1601                 fprintf(stderr, "cannot open /dev/console for output : %s\n",
1602                         strerror(errno));
1603                 _exit(0);
1604         }
1605
1606         close(STDIN_FILENO);
1607         dup(in_fd);
1608         close(STDOUT_FILENO);
1609         dup(out_fd);
1610         close(STDERR_FILENO);
1611         dup(out_fd);
1612
1613         close(in_fd);
1614         close(out_fd);
1615         chdir("/");
1616         umask(0);
1617         return 0;
1618 }
1619
1620 int
1621 main (int argc, char *argv[])
1622 {
1623         extern char *optarg;
1624         extern int optind;
1625         int arg;
1626         int err;
1627
1628         logsink = 1;
1629
1630         if (getuid() != 0) {
1631                 fprintf(stderr, "need to be root\n");
1632                 exit(1);
1633         }
1634
1635         /* make sure we don't lock any path */
1636         chdir("/");
1637         umask(umask(077) | 022);
1638
1639         conf = alloc_config();
1640
1641         if (!conf)
1642                 exit(1);
1643
1644         while ((arg = getopt(argc, argv, ":dv:k::")) != EOF ) {
1645         switch(arg) {
1646                 case 'd':
1647                         logsink = 0;
1648                         //debug=1; /* ### comment me out ### */
1649                         break;
1650                 case 'v':
1651                         if (sizeof(optarg) > sizeof(char *) ||
1652                             !isdigit(optarg[0]))
1653                                 exit(1);
1654
1655                         conf->verbosity = atoi(optarg);
1656                         break;
1657                 case 'k':
1658                         uxclnt(optarg);
1659                         exit(0);
1660                 default:
1661                         ;
1662                 }
1663         }
1664
1665         if (!logsink)
1666                 err = 0;
1667         else
1668                 err = daemonize();
1669
1670         if (err < 0)
1671                 /* error */
1672                 exit(1);
1673         else if (err > 0)
1674                 /* parent dies */
1675                 exit(0);
1676         else
1677                 /* child lives */
1678                 return (child(NULL));
1679 }